1 power amp or 7 mono power amps.
- Thread starter Varun_27
- Start date
jasonkaler
Distinguished
- Nov 22, 2011
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This could work, however you might have ground loop issues when using multiple separate amplifiers, especially if each one has its own power supply.
See if you have an option to try before you buy, otherwise I would recommend using as few components as possible if audio quality is important to you.
See if you have an option to try before you buy, otherwise I would recommend using as few components as possible if audio quality is important to you.
If i use mono amps for each channel, still i require torroidal transformer?
Single 1 for all?
How can i decide which transformer is required?
Can i power them in serial or parallel?
Can i connect their grounds of all 7 monoamps serially as in normal electrical circuits?
Apart from this i am having a power supply that came with my Preamplifier of 110V to 220V.
Should i use that power supply for the complete system or i have to use another power supply for the rest of system?
I am brainstorming with all these questions. Help me out please.
americanaudiophile
Titan
- Aug 27, 2008
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You need a transformer of the correct voltage and sufficient wattage to supply adequate power to the amp boards. Doesn't have to be toroidal.
The specs of the amp boards will specify the voltage and each will have a current spec that you will multiply by the number of boards for a minimum needed. Wattage equals voltage times current.
They connect in parallel to the power supply. Never in series.
The grounds are connected in parallel not series.No matter how you connect them they are in parallel there are no plus or minus. Google "star grounding"
The power supply of the preamp won't come close to powering the amp boards. The best way for each board to have it's own power supply. That way the boards don't interact through the power supply. You can do separate left-right supplies I would do separate front and surround power supplies. Surround channels don't usually play as loud or as constantly as the front three channels (and sub) so can often be smaller or shared with less compromise in quality.
The specs of the amp boards will specify the voltage and each will have a current spec that you will multiply by the number of boards for a minimum needed. Wattage equals voltage times current.
They connect in parallel to the power supply. Never in series.
The grounds are connected in parallel not series.No matter how you connect them they are in parallel there are no plus or minus. Google "star grounding"
The power supply of the preamp won't come close to powering the amp boards. The best way for each board to have it's own power supply. That way the boards don't interact through the power supply. You can do separate left-right supplies I would do separate front and surround power supplies. Surround channels don't usually play as loud or as constantly as the front three channels (and sub) so can often be smaller or shared with less compromise in quality.
I am extremely thankful to you as you have cleared much of my doubts.Do you mean to say that i can share 2 amps for 4 surround speakers with specifications more accurate as needed. And more powerful amp to front L and R speakers and 1 mono amp hor center channel speaker. And can I use stereo amps for sharing two channels ?
americanaudiophile
Titan
- Aug 27, 2008
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Each speaker has to have it's own amp channel.
There are multi-channel boards, stereo boards and mono boards. You can use any combination to get the right number of channels. The specs of the speakers will tell you their impedance and power requirement. If you have larger fronts than surrounds they can usually handle more power. The amps should be from the same maker and series so they match in sound.
There are multi-channel boards, stereo boards and mono boards. You can use any combination to get the right number of channels. The specs of the speakers will tell you their impedance and power requirement. If you have larger fronts than surrounds they can usually handle more power. The amps should be from the same maker and series so they match in sound.
If i am making a powerful amplifier with 7 mono amps and 1 subwoofer amp, do i need a seperate power supply board?
Can i make the system with two subs by using a stereo aamp for the subwoofer?
Usually the amps are rater o/p wattage power, are they RMS power or PMPO ?
americanaudiophile
Titan
- Aug 27, 2008
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The amp boards do not have any power supplies so you need at least one power supply board larger enough to run all the boards. The preamp power supply will be the wrong voltage and insufficient wattage so you can't use that at all for the amps.
Subwoofers usually have their own amps built in so you would probably not need an amp board for that. If each amp board had it's own power supply that would be best but much more expensive.
Yes you can use as many subs as you want.
You want RMS power into the same impedance to make comparisons.PMPO ratings are totally useless.
Subwoofers usually have their own amps built in so you would probably not need an amp board for that. If each amp board had it's own power supply that would be best but much more expensive.
Yes you can use as many subs as you want.
You want RMS power into the same impedance to make comparisons.PMPO ratings are totally useless.
Yes PMPO ratings are totally useless, I've never seen them comming in to play, The hardwares for 7.1 active subwoofer that i think needful are:
1pc 7.1 pre-amplifier board and its power supply.
1pc mono amps each of the 7 speakers with their corresponding power supply,
1pc subwoofer amp, (1 sub amp for each i want to add) with their corresponding power supply,
Is anything left?
You mean to say each amp board has its own power supply or power supply BOARD.? The power supply i got with pre-amp is only for pre-amplifier( as it says 110V-220V ? I SHOULD NOT use any amp for my subs or can use it for subwoofer? How can i calculate the specifications for power supply board? If i do not use any amp for subwoofer I do not have to use any power supply board for it, but if i use an amp and a power supply then hav to use a power supply board for it ? Please guide.
Your question sounds like "I need a vehicle, and I don't know whether I need a truck, a SUV, or Ferrari". Also - no one serves shifts here, so no one owes you an answer.
Do you have any particular mono audio amps, or you're just asking "What you would recommend me to buy?"
Do you have the speakers already? What are their specs? If you don't have them - what are your requirements?
Do you have a budget?
Do you have any electronic skills?
Do you have any particular mono audio amps, or you're just asking "What you would recommend me to buy?"
Do you have the speakers already? What are their specs? If you don't have them - what are your requirements?
Do you have a budget?
Do you have any electronic skills?
No, i don't have electronic skills.
I am very NOVICE in this field.
Yes i have speakers of 6 of 8ohm 200w each and 1 of 280 watts at 8ohms and the preamp with its power supply which reads 110-220V. What i have to do with that?
In my 7.1 system, 4 mono amps of 200Watts/8 ohms (Dual DC power ± 42 --- ± 58V power supply needed), 2 mono amps of 280watts/8ohms ( dual DC power supply ± 58-± 70V power supply needed) and 1 mono amp of 500watts/8ohms ( Dual DC power ± 48V -- ± 60V power supply needed).
[I don't have purchased any amps or power supply for my subwoofer and don't know whether they are needed or not.].
Now these power supply comes with a power board or both come single, i don't know.
What to do next? ALABALCHO please guide..
You can power all mono amps from single good DC power supply (providing that you can find one with like +/- 60VDC, 20 Amps). But - with your lack of skills, you're risking either a fire, or your life, so I would rather recommend you getting off-the-shelf receiver, rated at 6/8 Ohms, and enjoy your music / movies / games.
Now i've purchased 7 mono amps with power supply (dual DC power supply ± 58-± 70V) each .what would be the commulative single power supply for all 7? and a power supply for 840W subwoofer is dual AC 24V. .
And i don't know anything about the power supply boards. Do i need a single power supply board for all 7 mono amps and another power supply board for subwoofer?
"I don't know anything about cars, but I bought a project car and I'm starting assembling it..."
"I bought a box, and I don't know what is inside, but I want to make it work. Can you help me?"
You're on your own, @Varun_27. Nobody here knows what you've bought, how it is supposed to work, etc. All these "amps" you got have specs - voltage and current. Multiply the current by 7 - this is what your "cumulative single power supply" is supposed to deliver.
"I bought a box, and I don't know what is inside, but I want to make it work. Can you help me?"
You're on your own, @Varun_27. Nobody here knows what you've bought, how it is supposed to work, etc. All these "amps" you got have specs - voltage and current. Multiply the current by 7 - this is what your "cumulative single power supply" is supposed to deliver.
The power supplies i need for mono amplifiers are:
(each 1 for 1 amplifier)(For speakers Center, Front L, Front R, Rear L, Rear R, Surround L, Surround R respectively).
Dual DC power supply ± 58 --- ± 70V (500W) X 1 pc (Centre)
Double AC12-28V range (420W) X 2 pcs (Front L, R).
DC dual 40v (170W) X 4 pcs (Rears and Surrounds)
Subwoofer
Double 24V, Power 300W above Ring Transformer X 1 pc
(OR PLEASE TELL ME THE COMMULITIVE SINGLE POER SUPPLY FOR ALL).
My questions are :
1. Can i use a commulative 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 and SINGLE POWER SUPPLY BOARD for all?)
(each 1 for 1 amplifier)(For speakers Center, Front L, Front R, Rear L, Rear R, Surround L, Surround R respectively).
Dual DC power supply ± 58 --- ± 70V (500W) X 1 pc (Centre)
Double AC12-28V range (420W) X 2 pcs (Front L, R).
DC dual 40v (170W) X 4 pcs (Rears and Surrounds)
Subwoofer
Double 24V, Power 300W above Ring Transformer X 1 pc
(OR PLEASE TELL ME THE COMMULITIVE SINGLE POER SUPPLY FOR ALL).
My questions are :
1. Can i use a commulative 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 and SINGLE POWER SUPPLY BOARD for all?)
ElectrO_90
Splendid
- Apr 17, 2007
- 5,111
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Although I can agree with what you say, if you want quality you use Mono Amps - due to the fact you won't get crossover like you can with Stereo amps.
ElectrO_90
Splendid
- Apr 17, 2007
- 5,111
- 451
- 27,140
Since this is an old post thats been revised, what is it you really need?
I am confused, are you installing this in a car and need 12V or what?
I am confused, are you installing this in a car and need 12V or what?
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?)
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
Splendid
- Apr 17, 2007
- 5,111
- 451
- 27,140
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.
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.
jsmithepa
Polypheme
- Jun 14, 2014
- 13,096
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- 60,840
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.
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.
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