2.1 plate amp? - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 17 Old 09-08-10, 01:04 PM Thread Starter
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2.1 plate amp?

Do you guys know of any plate amps that can run straight off the audio outputs from my tv?
If you don't have a receiver in your bed room how can i add a subwoofer?
It doesn't have to be 2.1 but it be nice.


I know of the Dayton MCA2550D 2.1 Channel Class D Amplifier but it seems a bit weak and too pricey. Is there any others?
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post #2 of 17 Old 09-08-10, 01:15 PM
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Re: 2.1 plate amp?

Any tv that has phono outputs can send a signal to a plate amp. If your sub amp as high level phono inputs, this is ideal, but the normal low level input would still work as well. If your sending a full range signal to the sub though, you will obviously need to use the on board crossover to try integrate it with the TV, and you would likely need to use the maximum available, meaning you really want the sub as close to you TV as is possible.

Are you thinking of building a sub to add to your tv to improve its sound?
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post #3 of 17 Old 09-08-10, 02:05 PM Thread Starter
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Re: 2.1 plate amp?

I tried connecting my living room sub in my bedroom(directly to tv) to see how it sounded but barely turning up the gain was sending to much signal to the sub. Even though i had a the cross over on about 100hz, the sub was still getting alot of full range sound.

I believe the output signal from the tv was at 100%. But with a receiver, the signal to the sub amp is controlled by the receiver according to volume setting.

well being a bass junkie, yes i do want better sound from my 32in lcd samsung which has what maybe a couple of 2in speakers lol
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post #4 of 17 Old 09-08-10, 02:13 PM
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Re: 2.1 plate amp?

The TV needs to obviously adjust the output volume from those terminals on it. If it doesnt you cant add a sub. The only other way possible is via a high level connection to a sub that can take it, and a tv with speaker terminals on the rear.

If you dont have any of those, then its not going to happen. Sorry.
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post #5 of 17 Old 09-08-10, 02:32 PM
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Re: 2.1 plate amp?

Can you lower the output going to the sub with the TV's volume control?




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post #6 of 17 Old 09-08-10, 04:58 PM Thread Starter
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Re: 2.1 plate amp?

No tv volume has no control over it
the signal is constant.
i think that is how all tvs are

because when ever i've hooked up the audio out on plenty of tvs to receivers, the tv can be muted or turned down and the receiver still gets signal.
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post #7 of 17 Old 09-08-10, 05:01 PM
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Re: 2.1 plate amp?

Have you checked in the TV's menus to see if there is an option to swap from fixed volume output to variable. Some tv's allow this.
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post #8 of 17 Old 09-08-10, 05:11 PM Thread Starter
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Re: 2.1 plate amp?

unfortunately no, mine does not. Do you know of any device that could control the signal? With a rca analog in and out, and just a simple volume knob. That would be perfect.
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post #9 of 17 Old 09-08-10, 05:14 PM Thread Starter
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post #10 of 17 Old 09-08-10, 05:17 PM
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Re: 2.1 plate amp?

well, every time you altered the volume on the tv, you would have to manually adjust the sub, which is no different from adjusting the subs gain anyway. Hope you've stocked up on spl meter batteries
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