I have two 12" kenwood KFC-W3003 4 OHM 600 Watt Maximum Impedance. I have them both in a sealed box with a divider in the middle, it sounds good and loud but i want deeper bass that will make your ears start ringing. What type of box should i use?

Please check the impedance of those subs. Are they 4 or 8 ohm speakers? Do they have dual voice coils? this app may not be capable of handling dual voice coil four ohms and you're trying to bring it down to a 2 ohm mono.

The KAC-624 is a 40 watt x2 @ 4 ohm RMS amp. 55 watt x2 @ 2ohm. 110 watt x 1 Bridged I assume at 4 ohm. Manual does not specify. It can run 2 ohm in stereo mode but is unclear on mono impedance requirement. It can run 4 ohm mono at 110 watt but at 2 ohm?

check speakers impedance are matching amps. example: if you drive a 4 ohm amp with lower imp you are close to blow your amp or it goes to protect itself from you. anyway your amp provides 140watts maximum on 4ohm in bridged mode, so if you connect two 12" kickers with 4ohm, they will have 2ohm in parallel connection. solution would be to connect them in row (serial) but impedance will go up to 8ohms then.

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It can't be done unless you choose to include some power resistors in your circuit for impedance matching. The problem with that would be some of your power will be lost in the form of heat across the resistors without the benefit of contributing any sound.

Also, the amplifier's damping factor will be compromised, so you may notice a loss in sound clarity. It's possible that you might not easily tell with subwoofers, depending on the enclosures they're mounted in, and whether they're isolated in a trunk vs being in the same airspace with you (hatchback, SUV, or pickup truck).

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off the same amp? you have two way different sounding speakers man. you can buy 2 identical speakers from the same company and brand and series and they will play differently every time. you have 2 speakers with nothing in common so you will hear a difference and maybe interference because of the different ohm levels.

You need to get a "Crossover network" first and wire that to the Amp, and wire speakers to that.
http://www.crutchfield.com/S-7PA3t8x61UZ/learn/learningcenter/car/crossovers.html
www.crutchfield.com/ISEO-rgbtcspd/learn/.../crossovers_install.html
http://en.wikipedia.org/wiki/Loudspeaker
http://www.rjbaudio.com/Audiofiles/SWtutorial.html
http://www.colomar.com/Shavano/construction.html

It's not bad, but at 400 watts, it's a bit underpowered
It'll be plenty loud, but the amp will distort before the speakers do, particularly if your subs are wired in parallel (as dual-driver boxes are typically wired)

Listen for distortion, and turn it down a bit if the sound gets fuzzy or static-y sounding

Its hard to tell what you can or cant do without knowing exactly which kenwood amp you are using. Generally speaking though most kenwood amps are stable only down to 2 ohms. you will be better off just using 2 of your 12s wired in parallel- that will give you a 2 ohm load. There is a way to use all 3 simply by wiring them in series, it will end up giving you a 12 ohm load on the amp though which will work fine but you wont ever achieve the full power that the amp can do.

If the Alpine is run bridged at a 4 ohm impedance then yes this would be fine. The amp is 400 Watts x 1 at 4 ohms. The P3 ha a 500 Watt rms rating. Just verify the impedance of your speaker. If you have a DVC 4 ohm speaker if wired in parallel you would present a 2 ohm impedance to the amp, that is bad. What is the impedance of your speaker?

Hello jeremymikjha,

Basically you want to match the subs in impedance and power.

With 4 ohm subs wired in parallel, the final load will be 2 ohms. Depending on how hard you want them to hit, a pair of 400 watt RMS subs will need an amp that delivers 600-1,000 watts into a 2 ohm load.

The enclosure you use will also make a big difference. A sealed enclosure will need more power. A ported enclosure will be louder with less power.

The Hifonics shown here would be a good choice for a sealed enclosure. It's rated for 1,100 watts RMS into a 2 ohm load.

http://www.sonicelectronix.com/item_17598_Hifonics+BXi+1610D.html

The Eclipse XA1200 outputs 600 watts RMS into a 2 ohm load. It would power the subs very well in a ported box.

http://www.sonicelectronix.com/item_17598_Hifonics+BXi+1610D.html

Somewhat less expensive but good quality would be one of the Alpine MRP series. The MRP-M500 is only $179.99 at SonicElectronix. It delivers 500 watts. It's big brother is the MRP-M1000 with twice the power. Be sure your subs are securely mounted or this amp will literally "lift the subs".

Hope this helps.