Amp for a homemade speaker box with car speakers?

The speakers are almost definitely going to be a pair Sony Xplod XS-R5743's
190W Peak

So with these power specs, what should the power ratings for the amp be? I considered building an amp, and unless there is something I've missed, it looks cheaper just to buy a car amp and just make it run from a wall outlet after a transformer. Especially when every amp that I see being built is a low power 1W LM386.

Please, let me know the best method for amplifying the audio to these speakers and the required power.


radiorahim7 years ago
For my car speaker boom boxes I use the Dayton T- amp from Parts express. It is small, can run off of batteries or a wall socket and at 15W per channel in a 4 ohm load is pretty loud especially with efficient car speakers. or if you just want the amp unit if you just get the PCB I would recommend getting the 12V power adapter they offer A cheap car receiver head or a small car amp would work well too. For wattage the number to look at is the RMS not the Peak. Good Luck.
Building a nice amp will cost a little more than buying one. I built a LM3886 amp (68W) from and it ran me a little less than a $100 because I already had a transformer. If you want to build the amp from a kit check out They have a bunch of T-amps that get good reviews. I would recommend the BASIC series unless you want to wind your own toroids and solder SMD's.
iamtoats7 years ago
These amps from parts-express look pretty useful. They fit right onto the back of the enclosure.
orksecurity7 years ago
Yes, you want a power amp if you want a significant amount of volume without distortion. A standard home-stereo amp will work just fine; there are lots of those available as people upgrade. Make sure the amp will tolerate 4-ohm speakers; most prefer 8-ohm but will tolerate 4-ohm (though not lower).