So since my HU blew up, I purchased a KENWOOD 6690HD and POLK DXI6500 speakers for the front and POLK DX525 for the back...and a matching POLK PA D5000.5 amp to power all of this.

This amp is a 5 channel amp rated at 70x4 and 200x1 RMS (sub channel) at 4 ohms or 100x4 and 400x1 @ 2 ohms....

Im considering a box off the Double D mods site and notice the there are subs rated at 4 and 2 ohms and 2+2 ohms?

My question is with this amp could I have all the speakers plugged in rated a 4 ohms and have the sub channel at 2 ohms? Or with all the speakers being 4 ohms do I need to get a 4 ohm sub as well??? Im hoping a 2ohm sub would be allowed as with a 2ohm sub I could get a little more power which would be nice. Although im not looking for overkill honda civic bass I just want a speaker than can pick up the slack from the components hense why I dont want much; also I dont wanna hear any rattles so not to much bass.

Also shuold I consider bridging the 4 channels for the speakers and running the 4 speaker channels bridged to the Front components...and let the HU powethe back speakers for fill and have the sub channel powering the sub? Would that work or would that be dangerous (overpowing amp)?

I feel like 70x4 for the speakers shuold be sufficient power considering im coming from a stock system and have never had aftermarket audio in my life... 70 watts RMS in my house is a ton of power on my vintage pioneer gear... 70 watts RMS to my HPM100s means I could not be in the room anymore...as it would be so loud. 70 watts RMS should be loud enough with the top off.. especially coming from the stock system, right?

Any insites would be appreciated.

 

70 watts to 4 speakers will be plenty loud. run a 2 ohm sub it wont be a problem

 

Both DD mods and penta will steer you in the right direction!
Good luck!

 

IMO, if you're running the speakers at 4 ohms, running the sub at 4 ohms would be a good idea. It would be a good idea to check with your Amplifier's owner's manual to make sure 2 ohm isn't an option. If you have a DVC sub you might be able to change the load to suit your needs by adjusting the wiring.

 

There is no reason not to run a 2 ohm sub

 

That amp is also capable of a 1ohm load on the sub channel, so yes, you can run differing ohm loads on the high channels versus the sub channel.

Bridging the front channels with a 4ohm load will produce 200wrms per channel and your speakers won't handle that. You could drop the gain, but then what would be the point of bridging them? Even though your front components are 100wrms, you don't need to feed them that power to get loud. The rear co-ax's are only 45wrms but wouldn't keep up with the fronts if you ran them off the HU's 14wrms. Look into setting the gains properly, all you need is a DMM, and you might be surprised how loud they will safely go.

You have a lot of options with choosing a sub due to having so many possible ohm loads. A 2ohm DVC (dual voice coil) sub will wire to 1ohm or 4ohm, A 4ohm DVC will wire to 2ohm as will a 2ohm SVC (single voice coil), and a 4ohm SVC to 4ohm obviously. Not all subs are made the same though, some are made to get loud and some are made to sound good. You have great speakers, you should get a sub that does them justice. TC Sounds Epic 8" or 10" and the SSA Dcon are great sound quality subs, or stick with Polk and get something from their MM line of subs.