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#1
Posted to rec.audio.tech
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Sennheiser earphones: dB 1V RMS vs others SPL dB mW ?
I need a pair of more-than-average sensitivity earphones for a body-less
electric practice guitar. It came with a pair by Creative Labs (IIRC), but I've lost them. The built-in preamp does not put much out. A separate amp is not suitable as I'm lending/selling this guitar to a friend who intends using it on a long airline flight. I thought some Sennheiser earbuds looked OK, but they are specified as 113dB at 1V RMS, which is not the same way other manufacturers specify theirs, e.g. 106dB 1 mW. How do we convert Sennheiser's numbers to the 'standard'? (Being earbuds, I can't just try them in the store). |
#2
Posted to rec.audio.tech
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Sennheiser earphones: dB 1V RMS vs others SPL dB mW ?
"John Hall" wrote in message news:YCpGg.14463$tP4.1362@clgrps12... I need a pair of more-than-average sensitivity earphones for a body-less electric practice guitar. It came with a pair by Creative Labs (IIRC), but I've lost them. The built-in preamp does not put much out. A separate amp is not suitable as I'm lending/selling this guitar to a friend who intends using it on a long airline flight. I thought some Sennheiser earbuds looked OK, but they are specified as 113dB at 1V RMS, which is not the same way other manufacturers specify theirs, e.g. 106dB 1 mW. How do we convert Sennheiser's numbers to the 'standard'? **Find out the impedance. BTW: Sennheiser's specs are more honest and useful, regardless of what other manufacturers may or may not do. -- Trevor Wilson www.rageaudio.com.au -- Posted via a free Usenet account from http://www.teranews.com |
#3
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Sennheiser earphones: dB 1V RMS vs others SPL dB mW ?
On Mon, 21 Aug 2006 21:31:36 GMT, John Hall
wrote: I need a pair of more-than-average sensitivity earphones for a body-less electric practice guitar. It came with a pair by Creative Labs (IIRC), but I've lost them. The built-in preamp does not put much out. A separate amp is not suitable as I'm lending/selling this guitar to a friend who intends using it on a long airline flight. Is he going to be allowed to take that sort of thing on a flight now? |
#4
Posted to rec.audio.tech
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Sennheiser earphones: dB 1V RMS vs others SPL dB mW ?
Trevor Wilson wrote:
I thought some Sennheiser earbuds looked OK, but they are specified as 113dB at 1V RMS, which is not the same way other manufacturers specify theirs, e.g. 106dB 1 mW. How do we convert Sennheiser's numbers to the 'standard'? **Find out the impedance. BTW: Sennheiser's specs are more honest and useful, regardless of what other manufacturers may or may not do. Later, I found a review of Sennheiser PX 100 which says that Sennheiser's spec: 114dB/1V Eff at 32 ohms is equivalent to 99dB/1mW. I don't yet understand how the Sennheiser spec is more useful to me, when trying to compare their products against other brands. |
#5
Posted to rec.audio.tech
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Sennheiser earphones: dB 1V RMS vs others SPL dB mW ?
"Laurence Payne" lpayne1NOSPAM@dslDOTpipexDOTcom wrote in
message news On Mon, 21 Aug 2006 21:31:36 GMT, John Hall wrote: I need a pair of more-than-average sensitivity earphones for a body-less electric practice guitar. It came with a pair by Creative Labs (IIRC), but I've lost them. The built-in preamp does not put much out. A separate amp is not suitable as I'm lending/selling this guitar to a friend who intends using it on a long airline flight. Is he going to be allowed to take that sort of thing on a flight now? Indeed. I foresee a resurgence of book reading on airplane flights, at least until someone figures out how to make a bomb using only a normal book as raw material. |
#6
Posted to rec.audio.tech
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Sennheiser earphones: dB 1V RMS vs others SPL dB mW ?
"John Hall" wrote in message
news:3XDGg.15641$tP4.11677@clgrps12 Trevor Wilson wrote: I thought some Sennheiser earbuds looked OK, but they are specified as 113dB at 1V RMS, which is not the same way other manufacturers specify theirs, e.g. 106dB 1 mW. How do we convert Sennheiser's numbers to the 'standard'? **Find out the impedance. BTW: Sennheiser's specs are more honest and useful, regardless of what other manufacturers may or may not do. Later, I found a review of Sennheiser PX 100 which says that Sennheiser's spec: 114dB/1V Eff at 32 ohms is equivalent to 99dB/1mW. I don't yet understand how the Sennheiser spec is more useful to me, when trying to compare their products against other brands. The added utility of the Senn spec may be that it is factual, while competive specs may be more likely to be fantasy or science fiction. ;-) |
#7
Posted to rec.audio.tech
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Sennheiser earphones: dB 1V RMS vs others SPL dB mW ?
In article 3XDGg.15641$tP4.11677@clgrps12, John Hall wrote:
Trevor Wilson wrote: I thought some Sennheiser earbuds looked OK, but they are specified as 113dB at 1V RMS, which is not the same way other manufacturers specify theirs, e.g. 106dB 1 mW. How do we convert Sennheiser's numbers to the 'standard'? **Find out the impedance. BTW: Sennheiser's specs are more honest and useful, regardless of what other manufacturers may or may not do. Later, I found a review of Sennheiser PX 100 which says that Sennheiser's spec: 114dB/1V Eff at 32 ohms is equivalent to 99dB/1mW. I don't yet understand how the Sennheiser spec is more useful to me, when trying to compare their products against other brands. Using watts is ridiculous. greg |
#8
Posted to rec.audio.tech
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Sennheiser earphones: dB 1V RMS vs others SPL dB mW ?
John Hall schreef: I need a pair of more-than-average sensitivity earphones for a body-less electric practice guitar. It came with a pair by Creative Labs (IIRC), but I've lost them. The built-in preamp does not put much out. A separate amp is not suitable as I'm lending/selling this guitar to a friend who intends using it on a long airline flight. I thought some Sennheiser earbuds looked OK, but they are specified as 113dB at 1V RMS, which is not the same way other manufacturers specify theirs, e.g. 106dB 1 mW. How do we convert Sennheiser's numbers to the 'standard'? (Being earbuds, I can't just try them in the store). In your case you need to look at the impedance of the headphones in order to find a suitable headphone. Impedance is the resistance against an AC current. So the lower the impedance the louder the output at a constant (i/p) voltage. It goes as follows: Power [in Watts] = Impedance [in Ohms] / ( Voltage [in Volts] x Voltage) The math will show that a signal of 0.775Vrms will produce one mW in a 600 Ohm load and 8mW in a 75 Ohm load. This is about 9dB difference, almost twice as loud. In order to convert the two different ways of describing the sensitivity of the headphones, which in your case is not so important to know, you need also to convert the dBs because dBs are relative to a set measure and that differs for power and voltage. If you really want to go there here are the formulas you need: Air Pressu dBSPL = 20 log (SPL [Pa] / 0.2*10exp-4) Voltage: dBu = 20 log (E [V] / 0.775) Voltage: dBV = 20 log (E [V] / 1) Power: dBm = 10 log (P [W] / 1.0*10exp-3) SPL [Pa] = 10exp(dBspl / 20) * 0.2*10-4 E [V] = 10exp(dBu / 20) * 0.775 E [V] = 10exp(dBV / 20) * 1 P [W] = 10exp(dBu / 10) * 1.0*10exp-3 |
#9
Posted to rec.audio.tech
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Sennheiser earphones: dB 1V RMS vs others SPL dB mW ?
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#10
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Sennheiser earphones: dB 1V RMS vs others SPL dB mW ?
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#11
Posted to rec.audio.tech
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Sennheiser earphones: dB 1V RMS vs others SPL dB mW ?
Oh yeah, if we want to keep it simple here consult the list at the
bottom of this page and select one with a low impedance: http://www.rane.com/note100.html |
#12
Posted to rec.audio.tech
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Sennheiser earphones: dB 1V RMS vs others SPL dB mW ?
wrote in message ups.com... Again, true, but also in his case he doesn't need to comare the sensitivities, it just doesn't matter. He just needs a lowZ headphone. Maybe, but even given an identical impedance (32 ohms being fairly common), the sensitivity can still vary quite a lot. With low output devices, the difference in sensitivity can make headphones satisfactory, or virtually unusable IME. And if one were to try 8 ohm headphones, you would usually find there is insufficient drive current to be usable either. So the answer in many cases is to get the *correct* impedance, and high sensitivity. Or use a separate headphone amp. MrT. |
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