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#1
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How do sound decibels add together?
If you play two sounds simultaneously, each at 100 decibels, what would
a decibel meter read? 100 decibels? Tim Sprout |
#2
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How do sound decibels add together?
"Tim Sprout" wrote in message ...
If you play two sounds simultaneously, each at 100 decibels, what would a decibel meter [sic- read? 100 decibels? Assuming the sounds are uncorrelated, the powers add: 100dB + 100dB = 103dB. |
#3
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How do sound decibels add together?
What William said. That's roughly how sound levels (dB-SPL) add. If the two levels aren't identical it gets a little more complex.
Peace, Paul |
#4
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How do sound decibels add together?
On 30/08/2014 9:48 a.m., William Sommerwerck wrote:
"Tim Sprout" wrote in message ... If you play two sounds simultaneously, each at 100 decibels, what would a decibel meter [sic- read? 100 decibels? Assuming the sounds are uncorrelated, the powers add: 100dB + 100dB = 103dB. Surely you are ARE correlationed, as in phase-locked. In general terms yes 103dB, but if not identical in every way, slightly less than 103. geoff |
#5
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How do sound decibels add together?
"geoff" wrote in message
... On 30/08/2014 9:48 a.m., William Sommerwerck wrote: "Tim Sprout" wrote in message ... If you play two sounds simultaneously, each at 100 decibels, what would a decibel meter [sic- read? 100 decibels? Assuming the sounds are uncorrelated, the powers add: 100dB + 100dB = 103dB. Surely you are ARE correlationed [sic], as in phase-locked. ??? Why should they be? In general terms yes, 103dB, but if not identical in every way, slightly less than 103. The powers of two uncorrelated signals simply add -- that's a fact. 100dB + 100dB = 103dB Correlated signals -- I don't remember. I'd have to dig out a book. |
#6
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How do sound decibels add together?
"William Sommerwerck" wrote in message
... "geoff" wrote in message ... On 30/08/2014 9:48 a.m., William Sommerwerck wrote: "Tim Sprout" wrote in message ... If you play two sounds simultaneously, each at 100 decibels, what would a decibel meter [sic- read? 100 decibels? Assuming the sounds are uncorrelated, the powers add: 100dB + 100dB = 103dB. Surely you are ARE correlationed [sic], as in phase-locked. ??? Why should they be? In general terms yes, 103dB, but if not identical in every way, slightly less than 103. The powers of two uncorrelated signals simply add -- that's a fact. 100dB + 100dB = 103dB Correlated signals -- I don't remember. I'd have to dig out a book. My precarious and aging memory agrees with Geoff. If the signals are correlated with zero phase difference you add 3db. If they are out of phase then less, or even attenuation. But if we sum equal levels of random noise, I'd guess at any given moment you'd have slightly less than 3db, but when averaged over time the signals are would still would add 3db when summed. Then again, I've been having my share of 'senior moments' today. Sean |
#7
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How do sound decibels add together?
William Sommerwerck wrote:
"geoff" wrote in message ... On 30/08/2014 9:48 a.m., William Sommerwerck wrote: "Tim Sprout" wrote in message ... If you play two sounds simultaneously, each at 100 decibels, what would a decibel meter [sic- read? 100 decibels? Assuming the sounds are uncorrelated, the powers add: 100dB + 100dB = 103dB. Surely you are ARE correlationed [sic], as in phase-locked. ??? Why should they be? In general terms yes, 103dB, but if not identical in every way, slightly less than 103. The powers of two uncorrelated signals simply add -- that's a fact. 100dB + 100dB = 103dB Correlated signals -- I don't remember. I'd have to dig out a book. Correlated and in-phase, they will add to give an increase of 6dB Correlated and out of phase, they will cancel, the degree of cancellation depending on the accuracy of the phasing and amplitude. -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk |
#8
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How do sound decibels add together?
On Sun, 31 Aug 2014 17:13:57 -0700, "William Sommerwerck"
wrote: "geoff" wrote in message m... On 30/08/2014 9:48 a.m., William Sommerwerck wrote: "Tim Sprout" wrote in message ... If you play two sounds simultaneously, each at 100 decibels, what would a decibel meter [sic- read? 100 decibels? Assuming the sounds are uncorrelated, the powers add: 100dB + 100dB = 103dB. Surely you are ARE correlationed [sic], as in phase-locked. ??? Why should they be? In general terms yes, 103dB, but if not identical in every way, slightly less than 103. The powers of two uncorrelated signals simply add -- that's a fact. 100dB + 100dB = 103dB Correlated signals -- I don't remember. I'd have to dig out a book. Correlated signals will add to 106dB if in perfect phase - right down to - infinity dB if perfect antiphase d |
#9
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How do sound decibels add together?
Sean Conolly wrote:
My precarious and aging memory agrees with Geoff. If the signals are correlated with zero phase difference you add 3db. If they are out of phase then less, or even attenuation. This is correct for powers, which is what we are talking about when we talk about SPL. But if we sum equal levels of random noise, I'd guess at any given moment you'd have slightly less than 3db, but when averaged over time the signals are would still would add 3db when summed. I believe it is 1.5dB for adding uncorrelated noises with the same spectra and the same average amplitude. All of this is fairly clumsy, because Bels, being a logarithmic scale, are not really intended for summing. They exist to make multiplying easier. Often if you have to sum values it's easier just to work back from SPL to pressure level in pascals and sum pressures (or back to volts or watts or what have you). --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#10
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How do sound decibels add together?
"Sean Conolly" wrote in message ...
But if we sum equal levels of random noise, I'd guess at any given moment you'd have slightly less than 3dB, but when averaged over time the signals are would still would add 3db when summed. If they were always "slightly less than 3dB", then they could never be 3dB over the long term. |
#11
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How do sound decibels add together?
Don Pearce wrote:
On Sun, 31 Aug 2014 17:13:57 -0700, "William Sommerwerck" wrote: "geoff" wrote in message ... On 30/08/2014 9:48 a.m., William Sommerwerck wrote: "Tim Sprout" wrote in message ... If you play two sounds simultaneously, each at 100 decibels, what would a decibel meter [sic- read? 100 decibels? Assuming the sounds are uncorrelated, the powers add: 100dB + 100dB = 103dB. Surely you are ARE correlationed [sic], as in phase-locked. ??? Why should they be? In general terms yes, 103dB, but if not identical in every way, slightly less than 103. The powers of two uncorrelated signals simply add -- that's a fact. 100dB + 100dB = 103dB Correlated signals -- I don't remember. I'd have to dig out a book. Correlated signals will add to 106dB if in perfect phase - right down to - infinity dB if perfect antiphase I don't think all of these scholarly statements apply to loudspeakers playing in a room, which is what the OP was talking about. For example, two speakers playing a mono signal out of phase - you would not hear nothing, you would hear plenty. It would just sound weird. Gary Eickmeier |
#12
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How do sound decibels add together?
On 1/09/2014 10:46 p.m., Adrian Tuddenham wrote:
k. Correlated and in-phase, they will add to give an increase of 6dB Yes - that's double the voltage = +6dB, double the power = +3dB. Correlated and out of phase, they will cancel, the degree of cancellation depending on the accuracy of the phasing and amplitude. |
#13
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How do sound decibels add together?
geoff wrote:
On 1/09/2014 10:46 p.m., Adrian Tuddenham wrote: k. Correlated and in-phase, they will add to give an increase of 6dB Yes - that's double the voltage = +6dB, double the power = +3dB. Just to avoid confusing the uninitiated: Double the voltage = quadruple the power = +6dB Always relate dB back to power and then it will make sense with less chance of an error. I know it's pedantic, but it avoids a lot of the misunderstandings which can occur if the 'power' step is left out of the reasoning. -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk |
#14
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How do sound decibels add together?
Adrian Tuddenham wrote:
geoff wrote: On 1/09/2014 10:46 p.m., Adrian Tuddenham wrote: k. Correlated and in-phase, they will add to give an increase of 6dB Yes - that's double the voltage = +6dB, double the power = +3dB. Just to avoid confusing the uninitiated: Double the voltage = quadruple the power = +6dB Always relate dB back to power and then it will make sense with less chance of an error. I know it's pedantic, Avoiding burning something up is hardly pedantry. but it avoids a lot of the misunderstandings which can occur if the 'power' step is left out of the reasoning. -- Les Cargill |
#15
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How do sound decibels add together?
On 9/1/2014 4:25 AM, Don Pearce wrote:
On Sun, 31 Aug 2014 17:13:57 -0700, "William Sommerwerck" wrote: "geoff" wrote in message ... On 30/08/2014 9:48 a.m., William Sommerwerck wrote: "Tim Sprout" wrote in message ... If you play two sounds simultaneously, each at 100 decibels, what would a decibel meter [sic- read? 100 decibels? Assuming the sounds are uncorrelated, the powers add: 100dB + 100dB = 103dB. Surely you are ARE correlationed [sic], as in phase-locked. ??? Why should they be? In general terms yes, 103dB, but if not identical in every way, slightly less than 103. The powers of two uncorrelated signals simply add -- that's a fact. 100dB + 100dB = 103dB Correlated signals -- I don't remember. I'd have to dig out a book. Correlated signals will add to 106dB if in perfect phase - right down to - infinity dB if perfect antiphase d So...loudness is power based, logarithmic. A stadium of 50,000 cheering people generates power, which increases the loudness, with some attenuation depending on phase, and is not 50,000 X the loudness of 1 person cheering. Thanks. I have always wondered about this. Tim Sprout |
#16
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How do sound decibels add together?
Tim Sprout wrote:
On 9/1/2014 4:25 AM, Don Pearce wrote: On Sun, 31 Aug 2014 17:13:57 -0700, "William Sommerwerck" wrote: "geoff" wrote in message ... On 30/08/2014 9:48 a.m., William Sommerwerck wrote: "Tim Sprout" wrote in message ... If you play two sounds simultaneously, each at 100 decibels, what would a decibel meter [sic- read? 100 decibels? Assuming the sounds are uncorrelated, the powers add: 100dB + 100dB = 103dB. Surely you are ARE correlationed [sic], as in phase-locked. ??? Why should they be? In general terms yes, 103dB, but if not identical in every way, slightly less than 103. The powers of two uncorrelated signals simply add -- that's a fact. 100dB + 100dB = 103dB Correlated signals -- I don't remember. I'd have to dig out a book. Correlated signals will add to 106dB if in perfect phase - right down to - infinity dB if perfect antiphase d So...loudness is power based, logarithmic. A stadium of 50,000 cheering people generates power, which increases the loudness, with some attenuation depending on phase, and is not 50,000 X the loudness of 1 person cheering. Just to chuck a spanner in the works, it depends what you mean by "loudness". The power of a sound is the oscillating pressure change multiplied by the oscillating particle velocity. The capsule of a SPL meter measures the pressure change and then assumes the velocity change is proportional to that. Therefore, if the sound power is calculated by multiplying the pressure change by the velocity change, the power is proportional to the square of the pressure change (or proportional to the square of the velocity change if you measured it with a ribbon mic). This is why the scale on a common-or-garden analogue SPL meter is not marked linearly: it has to take account of the square-law relationship. If you used a pressure capsule on a voltmmeter or oscilloscope to measure the pressure, you would have to square the readings to make them proportional to power. To come back to your cheering people, the power of their voices does add up linearly (assuming they are uncorrelated and all exactly the same distance from the mic), but the mic voltage from 50,000 people will be SQRT(50,000) times the voltage of one single person. Now to throw another spanner in the works. Suppose you had a single loudspeaker generating a given sound power and you added a second loudspeaker giving the same power but uncorrelated - you would expect double the sound power (+3dB) and you would be correct. Now drive the second speaker in exact correlation with the first and the theory says you would get +6dB, which is four times the power - "but that's nonsense!" I hear you say. However, each loudspeaker is now working in the pressure field generated by the other, so it is having to do twice as much work; which means that the theory stands up to reality. In practice, most loudspeakers are so inefficient that the actual sound power they deliver is just a tiny proportion of the total electrical power they absorb, so you you wouldn't notice much change in the loading on the amplifiers. You might find there isn't a 6dB increase in practice, because the increased loading on each loudspeaker may mean that it can no longer deliver as much sound power as when it was unloaded. -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk |
#17
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How do sound decibels add together?
On Tue, 02 Sep 2014 08:35:32 -0800, Tim Sprout
wrote: On 9/1/2014 4:25 AM, Don Pearce wrote: On Sun, 31 Aug 2014 17:13:57 -0700, "William Sommerwerck" wrote: "geoff" wrote in message ... On 30/08/2014 9:48 a.m., William Sommerwerck wrote: "Tim Sprout" wrote in message ... If you play two sounds simultaneously, each at 100 decibels, what would a decibel meter [sic- read? 100 decibels? Assuming the sounds are uncorrelated, the powers add: 100dB + 100dB = 103dB. Surely you are ARE correlationed [sic], as in phase-locked. ??? Why should they be? In general terms yes, 103dB, but if not identical in every way, slightly less than 103. The powers of two uncorrelated signals simply add -- that's a fact. 100dB + 100dB = 103dB Correlated signals -- I don't remember. I'd have to dig out a book. Correlated signals will add to 106dB if in perfect phase - right down to - infinity dB if perfect antiphase d So...loudness is power based, logarithmic. A stadium of 50,000 cheering people generates power, which increases the loudness, with some attenuation depending on phase, and is not 50,000 X the loudness of 1 person cheering. Thanks. I have always wondered about this. Tim Sprout And bear in mind that most of those 50,000 are a long way from you. Only the nearest twenty or so people contribute in meaningful way to the loudness you hear. The rest just add the background sussuration. d |
#18
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How do sound decibels add together?
"Tim Sprout" wrote in message ...
So... loudness is power based, logarithmic. No. Loudness is a subjective measurement. It is not exactly related to SPL. |
#19
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How do sound decibels add together?
On Tue, 02 Sep 2014 08:35:32 -0800, Tim Sprout
wrote: On 9/1/2014 4:25 AM, Don Pearce wrote: On Sun, 31 Aug 2014 17:13:57 -0700, "William Sommerwerck" wrote: "geoff" wrote in message ... On 30/08/2014 9:48 a.m., William Sommerwerck wrote: "Tim Sprout" wrote in message ... If you play two sounds simultaneously, each at 100 decibels, what would a decibel meter [sic- read? 100 decibels? Assuming the sounds are uncorrelated, the powers add: 100dB + 100dB = 103dB. Surely you are ARE correlationed [sic], as in phase-locked. ??? Why should they be? In general terms yes, 103dB, but if not identical in every way, slightly less than 103. The powers of two uncorrelated signals simply add -- that's a fact. 100dB + 100dB = 103dB Correlated signals -- I don't remember. I'd have to dig out a book. Correlated signals will add to 106dB if in perfect phase - right down to - infinity dB if perfect antiphase d So...loudness is power based, logarithmic. A stadium of 50,000 cheering people generates power, which increases the loudness, with some attenuation depending on phase, and is not 50,000 X the loudness of 1 person cheering. Thanks. I have always wondered about this. Tim Sprout A rough rule of thumb - all else being equal - is that you need about a 10dB increase in SPL for a subjective doubling of perceived loudness. This comes with a multitude of caveats. d |
#20
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How do sound decibels add together?
Don Pearce wrote:
So...loudness is power based, logarithmic. A stadium of 50,000 cheering people generates power, which increases the loudness, with some attenuation depending on phase, and is not 50,000 X the loudness of 1 person cheering. And bear in mind that most of those 50,000 are a long way from you. Only the nearest twenty or so people contribute in meaningful way to the loudness you hear. The rest just add the background sussuration. In an open stadium this is definitely the case; you can think of the top of the stadium as being infinitely absorptive. Sound just goes up and keeps on going. But in a closed reverberant basketball court it's not! --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#21
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How do sound decibels add together?
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#23
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How do sound decibels add together?
On Tue, 2 Sep 2014 21:09:02 +0000 (UTC), Jeff Henig
wrote: Don Pearce wrote: On Tue, 2 Sep 2014 20:23:51 +0000 (UTC), Jeff Henig wrote: Don Pearce wrote: On 2 Sep 2014 14:39:09 -0400, (Scott Dorsey) wrote: Don Pearce wrote: So...loudness is power based, logarithmic. A stadium of 50,000 cheering people generates power, which increases the loudness, with some attenuation depending on phase, and is not 50,000 X the loudness of 1 person cheering. And bear in mind that most of those 50,000 are a long way from you. Only the nearest twenty or so people contribute in meaningful way to the loudness you hear. The rest just add the background sussuration. In an open stadium this is definitely the case; you can think of the top of the stadium as being infinitely absorptive. Sound just goes up and keeps on going. But in a closed reverberant basketball court it's not! --scott We don't bother with basketball over here, but a large public swimming pool certainly proves this. Why do people insist on screaming when they swim? d Maybe you should stop throwing Babe Ruth bars into the pool, Don. (One of my fave movie pranks, BTW. Caddy Shack was a classic.) Okay, not seen that movie, but | looked up Babe Ruth bars - couldn't find them. But I did find Baby Ruth bars, and even before I realised what the swimming pool prank must have been, I got what they looked like. What kind of a mind do I have? d Here's your clip. Heh... http://youtu.be/TPxiXGr9nFM Yup, I wrote exactly that scene in my head. Somebody had to eat it at the end. d |
#24
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How do sound decibels add together?
On 3/09/2014 4:35 a.m., Tim Sprout wrote:
So...loudness is power based, logarithmic. A stadium of 50,000 cheering people generates power, which increases the loudness, with some attenuation depending on phase, and is not 50,000 X the loudness of 1 person cheering. That one must be a really crap team ! geoff |
#26
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How do sound decibels add together?
On 9/2/2014 3:15 PM, Don Pearce wrote:
On 2 Sep 2014 14:39:09 -0400, (Scott Dorsey) wrote: Don Pearce wrote: So...loudness is power based, logarithmic. A stadium of 50,000 cheering people generates power, which increases the loudness, with some attenuation depending on phase, and is not 50,000 X the loudness of 1 person cheering. And bear in mind that most of those 50,000 are a long way from you. Only the nearest twenty or so people contribute in meaningful way to the loudness you hear. The rest just add the background sussuration. In an open stadium this is definitely the case; you can think of the top of the stadium as being infinitely absorptive. Sound just goes up and keeps on going. But in a closed reverberant basketball court it's not! --scott We don't bother with basketball over here, but a large public swimming pool certainly proves this. Why do people insist on screaming when they swim? d Hmm, I don't recall ever screaming when swimming. Must be a panda kind of thing. ;-) == L... RC -- |
#27
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How do sound decibels add together?
Don Pearce: Got a problem with basketball? Where is "over here", man?
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#28
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How do sound decibels add together?
On Tue, 2 Sep 2014 16:12:15 -0700 (PDT), wrote:
Don Pearce: Got a problem with basketball? Where is "over here", man? No problem with it - apart from the extreme tedium of course. Over here is England. d |
#29
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How do sound decibels add together?
Don Pearce wrote: "On Tue, 2 Sep 2014 16:12:15 -0700 (PDT), wrote:
Don Pearce: Got a problem with basketball? Where is "over here", man? No problem with it - apart from the extreme tedium of course. Over here is England. d " Oh, ok, just making sure. |
#30
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How do sound decibels add together?
Don Pearce wrote:
On Tue, 2 Sep 2014 16:12:15 -0700 (PDT), wrote: Don Pearce: Got a problem with basketball? Where is "over here", man? No problem with it - apart from the extreme tedium of course. Over here is England. It's true that the British don't seem to go in for loud games that are played inside. Given the climate, this rather surprises me. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#31
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How do sound decibels add together?
On 3 Sep 2014 09:28:12 -0400, (Scott Dorsey) wrote:
Don Pearce wrote: On Tue, 2 Sep 2014 16:12:15 -0700 (PDT), wrote: Don Pearce: Got a problem with basketball? Where is "over here", man? No problem with it - apart from the extreme tedium of course. Over here is England. It's true that the British don't seem to go in for loud games that are played inside. Given the climate, this rather surprises me. --scott We didn't build the world's greatest empire by staying indoors just because it wa a bit damp and chilly outside. d |
#32
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How do sound decibels add together?
In article ,
Don Pearce wrote: On 3 Sep 2014 09:28:12 -0400, (Scott Dorsey) wrote: Don Pearce wrote: On Tue, 2 Sep 2014 16:12:15 -0700 (PDT), wrote: Don Pearce: Got a problem with basketball? Where is "over here", man? No problem with it - apart from the extreme tedium of course. Over here is England. It's true that the British don't seem to go in for loud games that are played inside. Given the climate, this rather surprises me. --scott We didn't build the world's greatest empire by staying indoors just because it wa a bit damp and chilly outside. Quite. Given most of our houses were equally cold and damp inside. -- *Forget about World Peace...Visualize using your turn signal. Dave Plowman London SW To e-mail, change noise into sound. |
#33
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How do sound decibels add together?
On Wed, 3 Sep 2014 17:04:19 +0000 (UTC), Jeff Henig
wrote: "Dave Plowman (News)" wrote: In article , Don Pearce wrote: On 3 Sep 2014 09:28:12 -0400, (Scott Dorsey) wrote: Don Pearce wrote: On Tue, 2 Sep 2014 16:12:15 -0700 (PDT), wrote: Don Pearce: Got a problem with basketball? Where is "over here", man? No problem with it - apart from the extreme tedium of course. Over here is England. It's true that the British don't seem to go in for loud games that are played inside. Given the climate, this rather surprises me. --scott We didn't build the world's greatest empire by staying indoors just because it wa a bit damp and chilly outside. Quite. Given most of our houses were equally cold and damp inside. One puzzling thing: if your climate is so damp, why is your humor so dry? Compensation? BTW, dry humor is NOT a bad thing--it's actually my favorite. Dry sarcasm is the best. Yup. The humour I like best is the kind that makes me work a little to get it. d |
#34
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How do sound decibels add together?
On Wed, 03 Sep 2014 17:56:25 +0100, "Dave Plowman (News)"
wrote: In article , Don Pearce wrote: On 3 Sep 2014 09:28:12 -0400, (Scott Dorsey) wrote: Don Pearce wrote: On Tue, 2 Sep 2014 16:12:15 -0700 (PDT), wrote: Don Pearce: Got a problem with basketball? Where is "over here", man? No problem with it - apart from the extreme tedium of course. Over here is England. It's true that the British don't seem to go in for loud games that are played inside. Given the climate, this rather surprises me. --scott We didn't build the world's greatest empire by staying indoors just because it wa a bit damp and chilly outside. Quite. Given most of our houses were equally cold and damp inside. Dead right. I remember as a child in winter there was usually ice on the inside of my bedroom window. No central heating, and the living room was the only one with a fire. d |
#35
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How do sound decibels add together?
In article ,
Don Pearce wrote: On Wed, 03 Sep 2014 17:56:25 +0100, "Dave Plowman (News)" wrote: In article , Don Pearce wrote: On 3 Sep 2014 09:28:12 -0400, (Scott Dorsey) wrote: Don Pearce wrote: On Tue, 2 Sep 2014 16:12:15 -0700 (PDT), wrote: Don Pearce: Got a problem with basketball? Where is "over here", man? No problem with it - apart from the extreme tedium of course. Over here is England. It's true that the British don't seem to go in for loud games that are played inside. Given the climate, this rather surprises me. --scott We didn't build the world's greatest empire by staying indoors just because it wa a bit damp and chilly outside. Quite. Given most of our houses were equally cold and damp inside. Dead right. I remember as a child in winter there was usually ice on the inside of my bedroom window. No central heating, and the living room was the only one with a fire. Same here. And in the North of Scotland. d -- *Experience is something you don't get until just after you need it * Dave Plowman London SW To e-mail, change noise into sound. |
#36
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How do sound decibels add together?
On 03/09/2014 18:26, Don Pearce wrote:
On Wed, 3 Sep 2014 17:04:19 +0000 (UTC), Jeff Henig wrote: BTW, dry humor is NOT a bad thing--it's actually my favorite. Dry sarcasm is the best. Yup. The humour I like best is the kind that makes me work a little to get it. I quite like the stuff that doesn't seem funny when you hear/ see it, then a few moments or weeks later hits you. Often while you're in a situation where you daren't laugh. That and a good bit of slapstick. -- Tciao for Now! John. |
#37
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How do sound decibels add together?
On Wed, 03 Sep 2014 Don Pearce wrote:
We didn't build the world's greatest empire by staying indoors just because it wa a bit damp and chilly outside. Quite. Given most of our houses were equally cold and damp inside. Dead right. I remember as a child in winter there was usually ice on the inside of my bedroom window. No central heating, and the living room was the only one with a fire. Luxury! Further north we had to walk barefoot in the snow to school every day...10 miles - uphill in both directions. |
#38
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How do sound decibels add together?
In article ,
Tom McCreadie wrote: On Wed, 03 Sep 2014 Don Pearce wrote: We didn't build the world's greatest empire by staying indoors just because it wa a bit damp and chilly outside. Quite. Given most of our houses were equally cold and damp inside. Dead right. I remember as a child in winter there was usually ice on the inside of my bedroom window. No central heating, and the living room was the only one with a fire. Luxury! Further north we had to walk barefoot in the snow to school every day...10 miles - uphill in both directions. Don't know you were born. We started work down pit at 3 years old. Only school we had was Sunday school, after the 6 am service. Then had to groom the pit ponies. We did get Xmas off though - on a leap year. -- *A woman drove me to drink and I didn't have the decency to thank her Dave Plowman London SW To e-mail, change noise into sound. |
#39
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How do sound decibels add together?
"Gary Eickmeier" wrote in message
... I don't think all of these scholarly statements apply to loudspeakers playing in a room, which is what the OP was talking about. For example, two speakers playing a mono signal out of phase - you would not hear nothing, you would hear plenty. It would just sound weird. Gary Eickmeier While you were busy dismissing actual technical details as irrelevant (no surprise, since you apparently can't be bothered to understand what you're talking about), you forgot to actually read the OP and misrepresented it. There was nothing specific about speakers. Regardless, many of the technical details posted on the thread are explicitly relevant to multiple sound sources in a room, and are accurate technically. But you think they're "scholarly" so you don't have to bother understanding. So you don't understand: business as usual. Even reading the manual seems too tediously "scholarly" for you, so you don’t bother; and when you make ridiculous claims about understanding how your own equipment works, you end up with egg on your face. For example, two speakers playing a mono signal out of phase - you would not hear nothing, you would hear plenty. It would just sound weird. Master of the obvious! Boy, you must be some kind of "scholar" to know that advanced stuff! It's nice of you to come here and explain it to the experts. |
#40
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How do sound decibels add together?
Don Pearce wrote:
On 3 Sep 2014 09:28:12 -0400, (Scott Dorsey) wrote: Don Pearce wrote: On Tue, 2 Sep 2014 16:12:15 -0700 (PDT), wrote: Don Pearce: Got a problem with basketball? Where is "over here", man? No problem with it - apart from the extreme tedium of course. Over here is England. It's true that the British don't seem to go in for loud games that are played inside. Given the climate, this rather surprises me. --scott We didn't build the world's greatest empire by staying indoors just because it wa a bit damp and chilly outside. d Your empire sucked then as ours does now. But I grant y'all a need to get out of doors, for any reason. -- shut up and play your guitar * HankAlrich.Com HankandShaidriMusic.Com YouTube.Com/WalkinayMusic |
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