Amazon has an MB Quart 50wX4 at 4 ohms amp for $90. I'm getting MB Quart speakers and I hear they are pretty good so I wonder if they make good amps. I also see an alpine v12 on craigs for a good price, but I know that's an old amp. I just need something to power the 2 sets of component door speakers.
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Amazon gift cards

 

used to, not so much any more. I think they are owner by MAXXSONICS, who also owns crunch, hifonics, and some other car audio companies.

Bottom line they are more about cheap build quality to maximize profits. Have seen some of the new stuff, i am not impressed.

but thy are inexpensive enough, might work for a budget build.

I know RF build most of their subs.