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Author Topic: distributed speaker question  (Read 4699 times)

Hal Bissinger/COMSYSTEC

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Re: distributed speaker question
« Reply #10 on: January 19, 2015, 04:28:02 pm »


Quote
An amp that is rated for capable of 600 watts @8 ohms will drive it without a transformer-and the low freq rolloff and saturation associated with it.
To be more specific :)

And right there is the difference between commercial and audiophile equipment. Only way to know what it is capable of is to put dummy loads on each channel and run it up to just before clipping. Then measure the voltage and do the math. While you are at it leave it cook for a few hours to see if it self destructs.  ;D Most audiophile equipment specs are wildly exaggerated.

-Hal
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Ivan Beaver

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Re: distributed speaker question
« Reply #11 on: January 19, 2015, 07:37:47 pm »

To be more specific :)


And right there is the difference between commercial and audiophile equipment. Only way to know what it is capable of is to put dummy loads on each channel and run it up to just before clipping. Then measure the voltage and do the math. While you are at it leave it cook for a few hours to see if it self destructs.  ;D Most audiophile equipment specs are wildly exaggerated.

-Hal
And I would argue that even pro or commercial amplifiers will not deliver full output-especially the large ones.

In many cases they can deliver the rated power for some very short period of time (often less than 1/10th of a second) and have a continuous output around 1/4 or less of the "peak" output.

And this goes for the most respected names in the business.
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A complex question is easily answered by a simple-easy to understand WRONG answer!

Ivan Beaver
Danley Sound Labs

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Hal Bissinger/COMSYSTEC

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Re: distributed speaker question
« Reply #12 on: January 20, 2015, 01:34:14 pm »

And I would argue that even pro or commercial amplifiers will not deliver full output-especially the large ones.

In many cases they can deliver the rated power for some very short period of time (often less than 1/10th of a second) and have a continuous output around 1/4 or less of the "peak" output.

And this goes for the most respected names in the business.

I think a lot of that is to get around having to use Class 1 speaker wiring per UL and the NEC.

-Hal
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John Roberts {JR}

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Re: distributed speaker question
« Reply #13 on: January 20, 2015, 01:47:34 pm »

Wow now you guys are confusing me and I have actually designed install products.

Yes amps in general do not deliver full duty cycle. Haven't for several decades now. That said dedicated install products often encounter extremely compressed background music so actually experience higher duty cycle that live performance sound reinforcement.

It is common practice in constant voltage system design to budget in some amplifier power headroom (10% or more than needed). 

JR
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claude cascioli

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Re: distributed speaker question
« Reply #14 on: February 19, 2015, 08:51:23 pm »

I am installing 6 speakers in a small office. The sound source is a home hifi integrated amplifier.
I could do a series/ parallel arrangement with the 8 ohm speakers, but the question is, can I use 25 volt transformers at the speakers to allow for individual levelling and drive them from the amplifier without a step up tansformer at the amp?

yes you can a very good match
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Re: distributed speaker question
« Reply #14 on: February 19, 2015, 08:51:23 pm »


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