Barry Mann
July 28th 03, 09:37 AM
In >, on 07/27/03
at 12:31 PM, "Frank C. Dauenhauer" > said:
[ ... ]
>The problem is that when we are (apparently) using the system
>correctly (i.e., good sound overall for all the instruments and voices
>-- the instruments are acoustic and are played into microphones, and
>the instruments and voices are adjusted well for high, mid, and low
>tones -- any brief increase in dynamics, or volume, from an instrument
>(e.g., guitar) or voice, causes a "blackout" of sound from the
>speakers. That is, the stream of music from the speakers (Yamaha
>S115IV) stops and is replaced by brief silence that is preceded and
>followed by a "crack." It's almost like a circuit breaker has
>intercepted an overload and has kept it from getting through to the
>speakers. I am guessing that this is called "clipping." My impression
>(I'm not the person who owns or is allowed to adjust the Yamaha
>equipment) is that there is no room (i.e., headroom?) in the system to
>allow for momentary pulses of loud sound. For years we previously used
>what I would describe as Yamaha's 300-watt version of this board and
>we never had this kind of problem.
[ ... ]
Strictly speaking, your problem is related to, but different from
"clipping". Basically, you are pushing the amplifier beyond it's power
limit and it's "protection" circuit is shutting the unit down.
Each design team has its own ideas about "protection". Some protection
circuits operate discretely in the background, others are in your face.
I'm not sure what the best answer is. Some of the discrete protection
circuits lull the user into thinking everything is OK while the
amplifier secretly suffers, then fails early because of the chronic
abuse. Other more aggressive protection schemes, such as this one, let
you know when you step over the limit. While there is value in this
approach (the user will back off and respect the limits), it can be
annoying in professional applications.
The "crack" you describe is a side effect of the protection. In some
designs this "crack" is caused by the amplifier's reaction to the
speakers. Different speakers may not cause the same level of "crack".
Basically, you must turn things down, play in smaller rooms, or find
some more power.
You didn't say how many speakers you are using. If you hook-up too many
speakers, the amplifier has a right to complain.
-----------------------------------------------------------
SPAM:
wordgame:123(abc):<14 9 20 5 2 9 18 4 at 22 15 9 3 5 14 5 20 dot 3 15
13> (Barry Mann)
[sorry about the puzzle, SPAMers are ruining my mailbox]
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at 12:31 PM, "Frank C. Dauenhauer" > said:
[ ... ]
>The problem is that when we are (apparently) using the system
>correctly (i.e., good sound overall for all the instruments and voices
>-- the instruments are acoustic and are played into microphones, and
>the instruments and voices are adjusted well for high, mid, and low
>tones -- any brief increase in dynamics, or volume, from an instrument
>(e.g., guitar) or voice, causes a "blackout" of sound from the
>speakers. That is, the stream of music from the speakers (Yamaha
>S115IV) stops and is replaced by brief silence that is preceded and
>followed by a "crack." It's almost like a circuit breaker has
>intercepted an overload and has kept it from getting through to the
>speakers. I am guessing that this is called "clipping." My impression
>(I'm not the person who owns or is allowed to adjust the Yamaha
>equipment) is that there is no room (i.e., headroom?) in the system to
>allow for momentary pulses of loud sound. For years we previously used
>what I would describe as Yamaha's 300-watt version of this board and
>we never had this kind of problem.
[ ... ]
Strictly speaking, your problem is related to, but different from
"clipping". Basically, you are pushing the amplifier beyond it's power
limit and it's "protection" circuit is shutting the unit down.
Each design team has its own ideas about "protection". Some protection
circuits operate discretely in the background, others are in your face.
I'm not sure what the best answer is. Some of the discrete protection
circuits lull the user into thinking everything is OK while the
amplifier secretly suffers, then fails early because of the chronic
abuse. Other more aggressive protection schemes, such as this one, let
you know when you step over the limit. While there is value in this
approach (the user will back off and respect the limits), it can be
annoying in professional applications.
The "crack" you describe is a side effect of the protection. In some
designs this "crack" is caused by the amplifier's reaction to the
speakers. Different speakers may not cause the same level of "crack".
Basically, you must turn things down, play in smaller rooms, or find
some more power.
You didn't say how many speakers you are using. If you hook-up too many
speakers, the amplifier has a right to complain.
-----------------------------------------------------------
SPAM:
wordgame:123(abc):<14 9 20 5 2 9 18 4 at 22 15 9 3 5 14 5 20 dot 3 15
13> (Barry Mann)
[sorry about the puzzle, SPAMers are ruining my mailbox]
-----------------------------------------------------------