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Old 4th November 2013, 08:45 AM   #1
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Default Bass speaker amplifier?

Are there any bass amplifier boards available that are similar to perhaps, say, the Tripath amplifiers?

I've recently built a bluetooth speaker that has a 2.1 audio setup, but I had to make it mono because I couldn't find a way of powering the bass speaker, so used the other amplifier channel instead.

Are there any cheap (10-20/$15-30) amps out there that can take a stereo signal, mix it to mono with a low pass filter for a subwoofer? Really curious to know because it would open up a lot of different speaker designs.

Thanks!
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Old 5th November 2013, 03:13 PM   #2
Wizard of Kelts
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The first part of your post seems to suggest you want a board for a filter. The second part seems to indicate that you would like an amp as well.

Anyway, here's something on sale at Parts Express which is only a little bit over the $30 limit you set which might do you some good either way.

Technics REQ0207 100W Subwoofer Plate Amplifier 309-047
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Old 5th November 2013, 03:26 PM   #3
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There is nothing special about a bass amplifier, any amplifier will amplify bass. It also doesn't need to be of stunning quality.

Adding two stereo signals together is simply a matter of fitting a resistor in series with each channel, then connecting the other end of the resistors together, to complete the "adder" you then fit a similar value resistor between the joint above and 0V. The joint and 0V form the mono input to your amplifier.

Resistors of about 2K2 are common in this application.

The purists will chip in here with valid points such as:-

The bass speaker normally requires more power than the rest of the system - that is why you see 1000W sub-woofers.

A subwoofer requires a low pass filter - again a simple RC filter will suffice if you are on a budget. A woofer wont be harmed by a little MF, whereas a tweeter would be harmed with LF.

For 20 you are not going to be able to DIY an amplifier. Your best bet is probably a visit to Cash Convertors (a thrift shop for our American friends).

Last edited by KatieandDad; 5th November 2013 at 03:37 PM.
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Old 6th November 2013, 09:42 PM   #4
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There are home subwoofer amps complete with crossover, or at least there used to be.

I just checked American ebay and they had a unit for $29. You might want to check British ebay to see if they have a similar deal.
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Old 6th November 2013, 10:11 PM   #5
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Quote:
Originally Posted by MatthewP View Post
Are there any cheap (10-20/$15-30) amps out there that can take a stereo signal, mix it to mono with a low pass filter for a subwoofer? Really curious to know because it would open up a lot of different speaker designs.

Thanks!
there may be a few small chip amps
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