advantage of a dedicated power amp for the sub - Home Theater Forum and Systems - HomeTheaterShack.com

 
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post #1 of 8 Old 05-02-10, 09:22 PM Thread Starter
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advantage of a dedicated power amp for the sub

Good evening all ,

I would like to know the advantage of using a dedicated power amp to drive the sub versus using the sub out of a receiver ?

Also i am currently using a paradigm cinema 110ct sub and a HSU STF-2 sub connected to the output of an Onkyo TX-SR706 .

What would you recommend i use as a power amp for the subs?


Thank you


Alain
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post #2 of 8 Old 05-02-10, 09:48 PM
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Re: advantage of a dedicated power amp for the sub

A lot of folks including myself use hi powered pro audio amps to push large speakers or groups of speakers. Most plate amps the ones install inside a subwoofer do put out the needed power to power these home theater monsters. In your case you HSU has a very nice plate amp, that is a perfect match for your subwoofer, so you would not benefit from an external amp. I hope this made sense.

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post #3 of 8 Old 05-03-10, 01:49 AM
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Re: advantage of a dedicated power amp for the sub

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apilon wrote: View Post
Good evening all ,

I would like to know the advantage of using a dedicated power amp to drive the sub versus using the sub out of a receiver ?
Power. Most AVRs are about 100W/ch and many are less if all the channels are being driven hard. Many AVRs do not like a 4Ω load which is what a lot of subs are.

With an external poweramp, I can get 1000W or more easily and quite cheaply. With all speakers including subs you have a tradeoff between, size, efficiency and how low they will play. Because most people want them fairly small and play deep, they are inefficient and so need a lot of power for maximum performance.

Using the line out and a pro power amp also allows you to add further processing to optimise the sub(s) within the room.

Quote:
apilon wrote: View Post
What would you recommend i use as a power amp for the subs?


Thank you


Alain
Any decent pro amp. Best value for the $ are the Behringer EP2000/4000 (older versions were called the 1500/2500, basically a relabel only). Then there are the Yamaha P series, a number of Crest, QSC, Crown etc amps that will all do a similar job depending upon budget, bias preferences and features.

Work out your power requirements and budget and see what you can find that works.
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post #4 of 8 Old 05-03-10, 08:29 AM
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Re: advantage of a dedicated power amp for the sub

Quote:
apilon wrote: View Post
Good evening all ,

I would like to know the advantage of using a dedicated power amp to drive the sub versus using the sub out of a receiver ?

Also i am currently using a paradigm cinema 110ct sub and a HSU STF-2 sub connected to the output of an Onkyo TX-SR706 .

What would you recommend i use as a power amp for the subs?


Thank you


Alain

Just to make sure you know, You cannot hook up another amp to a sub that has an amp of it's own unless you by-pass the amp in the sub. If you have a passive sub,one without an amp, then you could use an external like the behringer.
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post #5 of 8 Old 05-03-10, 11:00 AM Thread Starter
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Re: advantage of a dedicated power amp for the sub

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tcarcio wrote: View Post
Just to make sure you know, You cannot hook up another amp to a sub that has an amp of it's own unless you by-pass the amp in the sub. If you have a passive sub,one without an amp, then you could use an external like the behringer.
Ah Thank very much this is an information i did not know ..guess it pretty much close my option then
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post #6 of 8 Old 05-03-10, 12:34 PM
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Re: advantage of a dedicated power amp for the sub

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Ah Thank very much this is an information i did not know ..guess it pretty much close my option then
I presumed you'd be bypassing the internal amp.
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post #7 of 8 Old 05-03-10, 01:18 PM
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Re: advantage of a dedicated power amp for the sub

Quote:
apilon wrote: View Post

I would like to know the advantage of using a dedicated power amp to drive the sub versus using the sub out of a receiver ?
Also just for clarification, The receivers "sub out" is a line level signal and is not an amplified signal that will drive a sub without using an external amp such as the amp built into the sub or an external amp.

Home theater:
Onkyo 805, Yamaha YDP2006EQ, Samson Servo 600 amp
3 EV Sentry 500 monitors across the front, 4 Mission 762i's Surrounds, SVS PB13U sub, Panasonic BDT220, Harmony 1100, Nintendo WiiU
Panasonic PT-AE8000 on a 120" 2,35:1 fixed screen

Living room system:
Sherwood/Newcastle R972, Mission 765's, SVS SBS02's, A/D/S MS3u sub, Yamaha YDG2030EQ
Yamaha KX-393 Tape deck, CDC 805 CD changer, Panasonic BD60, Sony turntable PS-T20
Panasonic TC-P50ST60, HD-PVR & WDTV Live, Harmony 900

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post #8 of 8 Old 05-03-10, 05:51 PM
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Re: advantage of a dedicated power amp for the sub

On the physics side of things. It takes more power to move a larger object. Subs are very large and because of that require a lot more power to operate than you speaker normally would.
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