Amplifier for diy Bluetooth speaker

[Ryan99]

Hi guys im new to the diy speaker world. Im looking to build a Bluetooth boombox and want to put a sub along with some mid range drivers and some tweeters. Can you bridge the sub side of a 2.1 channel amp to get more power to the sub? If not how do you incorporate a separate mono amp for the subwoofer? Thanks

 

[somebodyelse]

Which amp do you have in mind? The sub out of many 2.1 amps is already bridged.

 

[DVDdoug]

Can you bridge the sub side of a 2.1 channel amp to get more power to the sub?

No, bridging requires 2 amplifiers (or 2 out-of-phase output stages). There are ways to bridge a regular stereo it make one bridged amp, so you could use a 4-channel amp and convert one pair of channels to make the bridged sub amp. It's not unusual for people to use 2 identical stereo "bridgeable" amps and use one in bridged-mode for the sub. There are pro Crown amps with that feature as well as built-in filters for so you don't need a separate crossover.

Or as somebodyelse implied, there are already-bridged amplifiers. Or if you buy a pre-made 2.1 amp, the sub output probably already has more power and a built-in crossover.

If not how do you incorporate a separate mono amp for the subwoofer? Thanks

Assuming that you are building a crossover, mixers are made with summing amplifiers and it's super-easy to built one with an op-amp (if you know how to build electronics). Or you can make a fixed-passive mixer with 2 resistors (even easier). (You should NEVER simply "short" the left & right signals together!)

 

[voodooless]

Have a look at Sure Electronics amps:

WONDOM OFFICIAL SHOP | Black Friday Promotions | Bluetooth Amplifier Board - Sure Electronics - BCPB - 18650 charger - T-AMP - Volume Control

Sure Electronics is a professional audio amplifier supplier that provides electronics hobbyists and business partners the middleware which can help reduce customers' development difficulties and save their precious time-to-market by making the products directly released in the market.

store.sure-electronics.com

There are various options, some with Bluetooth, DSP, and possibilities for 2.1 setups. Various webshops sell these, so probably no need to order there directly (get your local warranty).

 

[somebodyelse]

IIRC Dayton have rebranded some of the Sure/Wondom JAB models. Tinysine have some with DSP and Bluetooth too. If you intend to use battery power rather than mains then the JAB boards would be ideal - they're designed for this use case and there's a battery accessory board available with holders for 18650 cells.

 

[Ryan99]

Which amp do you have in mind? The sub out of many 2.1 amps is already bridged.

I dont necessarily have anything in mind right now im just doing the research portion of things and making a list of possible components.