Variable filters, Bass boost, Large screw terminals.

Single power LED. Its nice to have some protection, and/or overcurrent LED's.

Like everyone else who has left a review, I have nothing but good things to say. Never overheats, operates fine in 2 Ohm bridged mode, (oops, did I do that?), and has a pleasant, sleek look. I burned a couple 12's with it... It ran into a 0.7 ohm load (I had to measure the destruction) for 7-10 seconds at high volume before my main fuse blew. Not a scratch on or in the amp. The speaker coils were black! I love this amp!

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Jensen 350W X1 @4Ohms -decent quality at a cheap price.

Never cuts out, great sound quality, under rated quite a bit, and loaded with features.

Not enough power for the retail price.

I have seen lots of amps, but this one is a great sq amp. For an amp rated at 400w rms and puts out over 650w rms @ 4 ohms, that is pretty good for an A/B amp. It would blow most mids/tweets but for subs its a great amp unless you need more power like I do right now. I have ran this guy all day cranked and it hasn't shut down once on me yet.

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Kenwood 719 x 2

Never overheats, underrated, subsonic filter, crossovers, awesome looks, could fit under my passenger seat. Great amp

None.

Wonderful amp. Totally underrated. Mine put out over 700 watts at 4 ohm bridged. Got all the features i needed, crossovers, subsonic filter, everything. Never had a single problem with it.

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Rockford punch 800.2, premier wasn''''t as powerful, but definitely better sq.