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JBL and MTX both offer good amplifiers.
So do some of the other suggested brands.

I was thinking of posting a new topic, but I wont clutter.

If I buy the JBL 600.1 or MTX 6500D amp, they both dont have a subsonic filter, so I will have to buy an RCA level filter of some kind, yes? I am port tuning my box to around 30hz-32hz, so I will need a 30hz filter???

Any advice? What if I dont opt for the filter at all?

yes 30Hz is good but you want a steep filter, and the line level FMOD ones aren't, so you have to stack two of them on each input, so you have to buy 4 of them at $20 each.
better off buying an amp with an ISF built in already. Kicker perhaps?

Without an ISF on a ported box, you'll unload the sub at frequencies below the tuned port, and the sub will over-excurt due to lack of suspension, and the sub will basically eat itself.
You'll be buying a new sub, and if the coil(s) cause a dead short, a new amplifier, too.

Thanks Glass. So basically getting a bargain cheap amp is only beneficial if you wanna run a sealed box (or the alternative is much more $$).

I looked at a Kicker KX600.1, it has a subsonic filter 12db/oct set at 25hz. The question is... will this be ok for my 30hz - 32hz tuned box???

yes. that's a small enough gap that it's not going to hurt anything.

There are a TON of decent entry level class D mono amps around though. Kicker was just one suggestion.
Avionixx, Hifonics, Elevation, even Planet Audio seems to be pretty highly regarded by those using the amps.

Thanks for the advice Glass, I will be buying on eBay, so Kicker looks by far my best option (in regard to availability).

I like the kx600 too. Had one running to my 8's. Never got hot, love the built in fan :) Took a shower a couple times too!! But it blew one day, it worked great tho.

High Society wrote:I like the kx600 too. Had one running to my 8's. Never got hot, love the built in fan :) Took a shower a couple times too!! But it blew one day, it worked great tho.

I think that's my favorite thing about my Kicker amps. I have run those things balls to the wall for over and hour before, my truck reaked of voice coil (I love the smell of voice coil in the morning) and my amps still weren't even warm to the touch.

class-D amps.

I like the cozy warmth of my 2250SX amps when they get fired up.. nice comfy 140 degrees :)
3 of those babies are like having a fancy fireplae right in my own car! Now that's pimpin'

hehe.

A bit of an off-topic... I noticed JL audio amps have identical power ratings (even at various ohms) from 11V to 14.5V e.g. "150 W RMS x 2 @ 1.5 ohm-4 ohm (11V-14.5V)".

MTX has RMS at 12.5 VDC and dynamic power 14.4 VDC, for which there is usually quite a difference.

Kicker rates RMS output at 12.5V and 14.4V, which there is also quite a difference, but varies from 2ohm (smaller difference) and 4ohm (greater).

Then theres some like JBL who just list RMS output in certain ohms, without any mention of voltage inputs to the amp!?

Which other amp companies have identical outputs at lower battery voltages? Buying JL would obviously benefit people with a standard battery and charging system, where voltage drops are more common???

Glass, care to elaborate (as you always do so well)??