Need a little help choosing an amp for my subwoofer

[Raduque]

Put a little 10" sub in a sealed .75cft box to add some bass to my car. It sometimes seems to hit hard, but other times seems to kind of run out of steam. I think it might be the amp, so I want to replace it with a new one.

Sub is a Kenwood KFC-W110s http://www.sonicelectronix.com/item_16054_Kenwood+KFC-W110S.html

Says it's 8ohms, 150w RMS/700w max power handling, and prefers a 1cft sealed (per Kenwood).

I have it powered by a Pyramid Gold "600w" amp (best information I can find online puts it at 150w x 4 channels @ 2 ohms 300w x 2 channels @ 4 ohms bridged, but those are just numbers and really don't mean anything) bridging channels 1/2 to power the sub.

I'd like to know what to look for in sub amp specs to drive this sub and have high, clean bass output without having to have the gains at 7/8ths.

I'm looking at these brands:
JL (heard they're very high-end, and probably expensive)
Pioneer (running a Pioneer DEH-P670 HU and really like it)
Alpine (had an awesome HU in my truck and loved it)
and maybe Sound Ordinance, which I've also heard good things about.

I don't want to spend more than about $200, because I'm also budgeting about $200 for a set of component speakers for my front doors (6.5" mids and 1" tweeters) and I'll either get a 4-channel amp for those or re-use the Pyramid.

It's all in a 98 Nissan Altima, if that matters any.

Thanks!

Edit: I would not be adverse to buying a new subwoofer if that would be more appropriate, I simply used the Kenwood because I had it lying around, BNIB.

 

[hydroponik]

A mono amp would be the best bet for subs. The handling specs on the sub seem kinda weird at 150 rms, 750 peak, but I'd prob shoot for something around 200-300w.

 

[Raduque]

I've been looking at mono sub amps, but all of them only list output @ 2 or 4 ohm. Any way I can calculate output at 8 ohm?

 

[BassBomb]

http://www.kenwood.eu/products/car/speakers/component/KFC-W110S/details/

Says its 4ohm....

 

[Pulsar]

<rant>
Why is this the only damn board that logs me out in the middle of a post? I write up half a page to try to be helpful and get logged out and it clears my post so I can't even back arrow to the fricken thing.
</rant>

Anyway, I'm seeing conflicting information: I've found many places that says thats an 8 ohm and many that say it's a 4 ohm. Get a $10 multimeter from harbor freight and measure it yourself before you go any further. You ened to know the resistance of the speaker.

 

[Raduque]

Yea, I have a multimeter, I'll check it this weekend. I've been working way too much lately to deal with it. I managed to tune the headunit settings and it seems to be able to pound hard till right around the arbitrary "40" volume readout on the headunit, and at that point, the Infinitys in the doors are hurting my ears, so I don't play it that loud.

Stupid Infinity speakers.

 

[evident]

i'd look into a used jl slash mono amp. cheap if bbought used and can be used later when you upgrade your sub