1 power amp or 7 mono power amps.

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Varun_27

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I have a 7.1 channel pre-amplifier and searching a multi channel amplifier for it. Can i put 7 different mono amplifiers for each channel and a subwoofer amplifier.
 

Varun_27

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Sorry to get you confused.


I am making a 7.2 home theatre amplifier:

1.I have bought a pre-amplifier.
2.I am using 7 mono amps and 1 stereo amp (for subwoofer), {instead of single 7.1 amplifier}
Their specs are
1 Mono amp (500 W). Centre Dual DC power supply ± 58 --- ± 70V.
2 Mono amps (420 W each). Fronts Double AC12-28V range.
4 Mono amps (170 W each). Rear and Surrounds DC dual 40v
1 Stereo amp (840 W) Subwoofer Double 24V Ring transformers
Now i have these things with me - 1 pre-amplifier, 7 mono amplifiers+ 1 stereo amplifier,
now i have some questions -
My questions are :

1. Can i use a commulative ( single for all) power supply? If yes, please tell me which one do i need?
2. Will there be a separate power supply for subwoofer?

AND WHAT ABOUT THE POWER SUPPLY BOARDS?
( Do I should use each one with its own power supplies and their own power supply board?
OR
should I use each one's own power supply but a SINGLE COMMULATIVE power spply board?
OR
I should use SINGLE POWER SUPPLY (for all) and SINGLE POWER SUPPLY BOARD for all?)
 
D

Deleted member 217926

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I can't imagine why you wouldn't just buy a 7.2 channel home theater receiver rather than trying to do it the hard and potentially dangerous or even deadly way that you seem set on. I'd take it to the AVS forums or somewhere else more specific where someone may be interested in holding your hand through this.
 

ElectrO_90

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Normally, when you buy Amplifiers they are either MAINS Voltage of 12v for cars.
How can you buy an amp without a PSU attached? That seems quite specialised.

I agree with anort3 this seems very specialised. Above my pay grade.
 
When I first bumped into this thread am thinking like some purist want separate mono blocks for added sonic separation or something, then am finding out, we are dealing with putting together board amps.

But power supply seems like a very simple thing to me.

If each amp use its own PS, then the other other amps can't "steal" power from each other assuming your 120/220 has enough juice.

An amp spec for 100wpc x 2 (both channels driven) specifically says the power supply can deliver the electricity needed to drive the 2 amplifiers (2 mono channels) simultaneously without sagging.

Hence when a modern 7.1 AVR spec tells you 100wpc x 7 with 2 channels driven means when the other 5 channels comes active they will steal some power from the L+R. This sharing makes sense for low/normal lever listening/cut down cost, but don't even think of turning this puppy up very much.

Coupling pieces are done everyday, no big deal, why do you think DVD box ---> PreAmp ---> Processor(s) ----> amp blah-blah. When it comes to power supply, u just have to make sure SIGNAL GROUND = POWER GROUND = CHASSIS GROUND, if they are not then that's where your electronics training kicks in.

Too much? go store bought my man, don't DIY it.

OP using 220/110 converter? boy that's gonna be one big a** transformer.
 

Varun_27

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Friend this all happened due to a seller's mistake who sold me a pre-amplifier which she thought an amplifier and the reverse shipping will cost me more than half the product cost. So, still i have to buy a 7.1 amplifier which i couldn't find at that time. So all this started.
The mistake from my side is that i haven't bought it through through Paypal.

So friend please if you know please guide me.
 

Varun_27

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I have bought all these.
 

Varun_27

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.

Okay but, i am stuck so i have to complete.
 

ElectrO_90

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Varun, no one does a setup like you, it is not pratical.
Maybe better to cut your losses, and start again.
Everyone buys PRE MADE things, because it comes with a warranty. I'm not going to be following this thread anymore.

Face it, you made a mistake, learn from it, sell this crap to someone else, you will make a loss, then next time, buy a proper pre-made system.
 

Varun_27

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May 18, 2017
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Very true, i'll try to do that.
Thanks Electr0_90,
 

Varun_27

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1. I got a power supply witth my pre-amplifier with -12, +12 and G1, +5V terminals, After powering my pre-amp can I power my input board (12V) from it too?


2. If I want three subwoofers in my home theatre system, can i triforcate the wire going to my subwoofer and attach one amplifier with corresponding power supplies to all 3 wires and hook a subwoofer to each wire?


3. In a home theater amplifier, I have a pre-amplifier board with remote control device and a display and I have an audio input board with its display too,

Now i am left with two remote controls and two displays. what should i do?

I opted to put both the displays on the front screen but not to use pre-amplifier board's remote control and hide its IR so that there is no interference. Can i know your opinion on it or what difficulties should i face?
 

ElectrO_90

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Move this thread to an Electronics Forum - I can give you lots of answers, because this is what I am trained it, but I'm really not going to. Not through selfishness, but you don't have the understanding of Electronics and I would have to charge you for my time.
Honestly, use another forum where people would be more helpful in this matter.
And obviously you want to keep wasting more and more money with your system which you really don't understand.