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Re: bi-amping with m80s
michael_d #313157 07/02/10 08:06 PM
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Oh fine, just ignore that statement.

What I meant is that RARELY will anyone be using 200W at anything more than a brief peak, if even that.


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Re: bi-amping with m80s
Ken.C #313159 07/02/10 08:20 PM
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It is my understanding that the transisters "are" the amplifier. There would be one power supply that feeds the transisters that amplify the pre-amp signal. There would be one transister per channel.

Please correct me if I'm wrong.

Re: bi-amping with m80s
CatBrat #313161 07/02/10 08:29 PM
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The transistors do cause an amplified version of the input signal to be output, yes.

Technically, in Class AB, and D amps, there are a pair of output devices. One which handles the Positive portion of the signal and one which handles and Negative. Additionally, more than one pair can be used on high-output amps. You asked. laugh


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Re: bi-amping with m80s
ClubNeon #313162 07/02/10 08:41 PM
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Ok thanks, but in the simplest terms what I said is correct then.

Re: bi-amping with m80s
ClubNeon #313164 07/02/10 09:00 PM
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Originally Posted By: ClubNeon
The transistors do cause an amplified version of the input signal to be output, yes.

Technically, in Class AB, and D amps, there are a pair of output devices. One which handles the Positive portion of the signal and one which handles and Negative. Additionally, more than one pair can be used on high-output amps. You asked. laugh


OK, I'm curious. Why would the negative be an output. Negative should be an input from whatever electrical user, for a path back to ground, no?

Re: bi-amping with m80s
Ken.C #313166 07/02/10 09:19 PM
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Originally Posted By: kcarlile
Oh fine, just ignore that statement.

What I meant is that RARELY will anyone be using 200W at anything more than a brief peak, if even that.


Ok, I see what you mean then.

If my room were about 4 times as big as it is, with lots and lots of room treatments, bass traps and the like, and I was throwing some huge party with tons of people dancing around drunk out of their minds screaming, "turn it up man"!!!! Then I could see possibly maxing out the volume knob on the Emotiva and really giving it everything it has. But under normal circumstances, then I'm with you, most won't.

But I wouldn't say NEVER either. After all Alan has already told it before on here why the A1400 was designed. Because Ian was tired of his Denon dedicated amps (which if they were the Ultra's, put out 300 watts into 4 ohms) shutting down on him at his parties. So he built an amp that wouldn't disappoint him.

Sounds like I need to be at his next party!!! wink


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Re: bi-amping with m80s
Ken.C #313192 07/03/10 02:54 AM
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An amplifier is a combination of one power supply section feeding its voltage output through one or more channels, each with its set of output transistors(typically two per channel, running in parallel)to add the necessary voltage gain to the incoming signal at any given instant in time. So, both are parts of the amplifier, it's not one and/or the other. The gain is fixed, in the amounts described; there is no gain control in audio amplifiers.


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Re: bi-amping with m80s
Micah #313193 07/03/10 02:55 AM
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source->pre amp->amp

pre amp->input stage of the amp which is the base of the transistor. as the pre amp voltage increases, the voltage seen on the base increases so the transistor conducts more, or becomes more forward biased..(this is shown in the video i posted) and this is why you can push the amp into cut off if the input voltage is to high, you will push the transistors into saturation(exceeding their normal operating permitters)...

the negative of the transistor, is often the common ground. which is also the (-) terminal on the amp. the (-) has to be an output, because you have to ground the speaker, and with the (-) as an output it puts the speaker ground or (-) terminal = to the amp ground.


as Chris stated the power supply is one of the most important sections of a home audio amp, that is where the power is.. so you can ONLY get the power that that power supply can provide... if you have a 500W power supply you will ONLY get a total of 500W out of that amp. even if the manufacture says each channel is "rated" for 500W..... this is why receiver ratings are misleading many times... the power supply for the receiver can not provide 135W X 7.. even though each amp in the receiver can product 135W, you WILL NOT get 135W to each channel simultaneously.

Re: bi-amping with m80s
michael_d #313211 07/03/10 05:37 AM
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Originally Posted By: michael_d
OK, I'm curious. Why would the negative be an output. Negative should be an input from whatever electrical user, for a path back to ground, no?

The speaker doesn't just push out, it pulls in too. The audio signal is alternating current. For parts of the signal which are above 0, the P output device is active, for parts of the signal below 0, the N output device is active.

Actually, the P device is run slightly into the negative (even though it is very inefficient to do so), and the opposite for the N. This minimizes zero-cross distortion.


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Re: bi-amping with m80s
ClubNeon #313212 07/03/10 05:42 AM
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between the few EE types of us Chris, i think most of the questions will be answered.....

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