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Discussion Starter · #1 ·
Hello.


I am looking for a 5 channel amp for around $2000. I was looking at the Emotiva XPR-5 but that amp will need a 20 amp wall outlet. My theater room is a 15 amp wall outlet. Looking for a very similar specs as the XPR-5 which is 400 watts per channel in 8 ohms.


The 5 channel amp I am looking for does not have to be all in one box. It can be something like:

2 Channel Amp


3 Channel Amp


or

2 Channel Amp


2 Channel Amp


2 Channel Amp




I just won't use the extra amp on the 3 amps example.


Thanks for any advice!
 

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Discussion Starter · #3 ·

Quote:
Originally Posted by phantom52  /t/1523121/5-channel-amp-for-under-2000#post_24498374


Hard to find something in that price range. Why do you need such an amp? Very large room?


Yes, my room is very large.


I was looking at these amps on Amazon:

http://www.amazon.com/Behringer-NU6000-Ultra-Lightweight-High-Density-6000-Watt/dp/B005EHINFI/ref=sr_1_66?ie=UTF8&qid=1395161005&sr=8-66&keywords=power+amp


http://www.amazon.com/QSC-GX5-1400-Watt-Power-Amplifier/dp/B0018D84YC/ref=pd_sim_MI_1?ie=UTF8&refRID=0G3GYYGYPCEHVY1YRFZ7



These amps seems to be very powerful but they are more like DJ amps I think.
 

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With the kind of power you are wanting, you should use a 20 amp (or higher) outlet.

 

Watts = Volts x Amps

 

Since you are wanting 400 watts for each of 5 channels:

 

400 x 5 = V x A

 

2000 = V x A

 

With a standard 115 volt power line:

 

2000 = 115 x A

 

17.3913... = A

 

That is greater than a 15 amp circuit, so you ought not attempt such power on a 15 amp circuit.  And this is all calculated based on output power, which means that this 17.3913... is the current draw that you would have if the amplifier were 100% efficient, which is impossible.  It will really need to draw more current to actually be able to put out that much power.

 

So your request cannot be met.

 

 
 

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Quote:
Originally Posted by silverdream  /t/1523121/5-channel-amp-for-under-2000/0_100#post_24498391


Emotiva forums suggest that you can use a adapter if you don't have the 20AMP socket. Most of us will not come anywhere close to driving the XPR near its peak power. For the budget, you cant buy a better AMP (NEW).

http://www.amazon.com/Furman-ADP-1520B-Power-Adapter-Black/dp/B0063R8OPC
 

If that is so, then the people in the forums are giving bad advice.  There is no point in buying an amplifier of such power capability when one is going to hook it up in such a way that it will be impossible to actually deliver that power.  Since that device has a 12 amp circuit breaker in it (which, hopefully, will work, as one is potentially attempting to draw excess current through the wiring of one's home, which is dangerous), the power limit will then be 276 watts per channel, and that is not output power, that is power drawn into the amplifier.  So maximum continuous output power, into any impedance, will be less than that.  If someone is going to insist on using a 15 amp circuit, it would be far better to go with:

 

http://shop.emotiva.com/collections/amplifiers/products/xpa-5

 

It saves more than $1000, and will deliver about the same actual power output as the suggestion you mention.  And it will be less likely to be a fire hazard.

 

 

 

It is worth mentioning that Emotiva does NOT recommend using an adapter for the XPR-5 on a 15 amp circuit.  They properly recommend only using a 20 amp circuit, and they recommend having ONLY the Emotiva Amplifier on it, with nothing else connected to the circuit.  Given the power demands of the XPR-5, Emotiva is giving the right advice.  Here it is in their words:

 

The XPR-5 requires a 20 Amp circuit and standard IEC 20 Amp outlet (which is different than a 15 Amp outlet).If you don’t have a proper circuit and outlet, we recommend you have one installed by a qualified electrician.We recommend that the XPR-5 be plugged into its own dedicated 20 Amp circuit.

 

http://shop.emotiva.com/collections/amplifiers/products/xpr5
 

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It would seem the best and least expensive thing to do is get an electrician install the circuit you need. Then get the XPR5 from Emotiva. Either that or get something with less power and use the circuit you have now. Outlaw makes a 5 channel amp that gets good reviews but its not 400 wpc. You can also look into the Wyred4Sound digital amps which also get good reviews and are powerful.

http://www.wyred4sound.com/webapps/p/74030/117839/339143
 

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15 amps of current can only deliver so much power to your speakers. Assuming you have 8 ohm speakers, 15 amps will deliver 1800 watts total. This assumes your impedance won't dip below 8 ohms (it will) and the amp doesn't produce any heat (It will). This holds true no matter what amp you buy. Unless you want to constantly reset your breakers, look at buying a less powerful amp.
 

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Quote:
Originally Posted by phantom52  /t/1523121/5-channel-amp-for-under-2000/0_100#post_24498521


It would seem the best and least expensive thing to do is get an electrician install the circuit you need. Then get the XPR5 from Emotiva. Either that or get something with less power and use the circuit you have now. Outlaw makes a 5 channel amp that gets good reviews but its not 400 wpc. You can also look into the Wyred4Sound digital amps which also get good reviews and are powerful.

http://www.wyred4sound.com/webapps/p/74030/117839/339143
 

More likely, the best and least expensive thing to do would be to reevaluate one's power needs, as it is almost certain that one does not need that much power in a home setting.  However, you are right that if one wants that much power, one should have the proper outlet installed by a certified and qualified electrician, and not do something that is a fire hazard (and will not in any case actually be capable of giving one the power for which one has paid, which makes it doubly a mistake).
 

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Quote:
Originally Posted by Jack D Ripper  /t/1523121/5-channel-amp-for-under-2000#post_24498392


With the kind of power you are wanting, you should use a 20 amp (or higher) outlet.


Watts = Volts x Amps




Since you are wanting 400 watts for each of 5 channels:


400 x 5 = V x A



 



2000 = V x A



 



With a standard 115 volt power line:


2000 = 115 x A



 



17.3913... = A



 



That is greater than a 15 amp circuit, so you ought not attempt such power on a 15 amp circuit.  And this is all calculated based on output power, which means that this 17.3913... is the current draw that you would have if the amplifier were 100% efficient, which is impossible.  It will really need to draw more current to actually be able to put out that much power.


So your request cannot be met.

 



 

The above math appears to be correct for sine waves, which have a crest factor (peak to average ratio) of 3 dB.


Fuses get blown and circuit breakers trip based on average power extending over relatively long periods of time. Music has a crest factor that ranges from an absolute minimum of 6 dB to more than 20 dB. What happens if you adjust the above analysis to include the effects of crest factor?
 

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Something I don't see mentioned is the fact that typically other things are mooching off the same circuit. Things like TV's, receivers, dvr's etc. If you own your home get the 20A , loosing all your gear in a fire would suck.
 

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get a 20a line is the ideal solution, but ime, you would rarely trip the breaker. 15a is not absolute value when the breaker trips. Bass where the current draws the most power.
 

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Quote:
Originally Posted by datranz  /t/1523121/5-channel-amp-for-under-2000#post_24500044


get a 20a line is the ideal solution, but ime, you would rarely trip the breaker. 15a is not absolute value when the breaker trips. Bass where the current draws the most power.

This is the best advice...although if you cannot do this, at least try to limit what else you put on to that circuit.
 
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