Preout ???

[icecold0027]

Ive been reading that the stock Kenwood HU has 3 preouts. Is this right?? Also is the Kenwood Amp using one of these preouts? Thanks

 

[1sty]

yes and yes.

The sub amp uses the subwoofer preout that allows the amps output to be sepreatly controlled from the rest of the system. Its called NF level in the menu system. Use this instead of the bass adjustment

 

[icecold0027]

Thanks
I have a Fosgate P5002 Amp. The RCA wires and romote turn should be interchangeable but what about the power and ground. They look like 10 gauge wires which does not give me a good feeling for my new amp. I used to run an 8 gauge wire but that was only driving a 12' sub. Now Im going to 2 - 10' subs.
Also how difficult is it to remove that plastic monstrosity thats in our trunks.

 

[1sty]

The sub box is a pain to remove but not that hard.

You definitly need to upgrade the power wire. A 4 guage power and ground is the proper size for the P5002. That is taken directly from its manual. 8 guage is too small and the amp will under perform and the wire will overheat.

The subs an amp is driving has nothing to do with its potential power wire needs. An amplfier needs a wire of a given size to produce its rated power. The only thing that can manipulate that power output is the resistance of a subwoofer(s), not how many or what type neccissarily. For example, a single JL 10W0-4 (4 ohm sub) will extract every bit of potential power that amp can give but 2 12W0-4's ( both subs are 4 ohms)would only get half of the amps potential power as they are together an 8 ohm load and that amp wants to see a 4 ohm load to deliver its best performance. So in the first example, the 10" sub gets 500 watts. In the second each 12" sub only gets 125 watts as the 8 ohm load restricts the amp to only 50% of output and then each sub gets half the delivered power.

 

[icecold0027]

Now I have another question. When wireing the subs to the box, should I run them series or parallel?? The box does have two connectors but I was told to connect the subs to just one of them so I can bridge the amp and get more power.
If it matters the subs are 10' Alpine Type E (4 ohms each). The amp is a Fosgate P5002.
Thanks for all the help

 

[1sty]

You have a less then perfect mathc. Those subs can only be wired as either a 2 ohm load (which the amp can not handle) or an 8 ohm load which will only extract a fraction of the amps power so you essentialy spend a ton of cash for power you will never be able to use with these subs. You could spend much lees on an amp and get far more power out. For instance a Fosgate 3001 will outperform the amp you have now for 60% of the price.

YOu have to match subs wired impedance to the impedance the amplifier is designed to work at. Your other option is to buy sub(s) that can be wired for a total of a 4 ohm load, which is what your amp wants to see when bridged.

Not is all really that bad though. Your subs can't really take the power that the 5002 is capable of providing. So if you series the subs for an 8 ohm load, the subs will act to limit the amps output to what they can handle as it happens to work out.

 

[icecold0027]

Oh dear. Well I have the 5002 amp and there is not much I can do about that. The subs on the other hand I just bought and can return. I did get a good deal (buy one get one) though. Running them at 8 ohms would have the amp giving the subs 125W each, which is only half what they can handle. 2 ohms would be the same since I could only use one channel from the amp. 4 ohms would be wiring each sub to its own channel and here the amp would agian be at 125W x 2 at 4 ohms. So what should I do. 2 ohms, 4 ohms, 8 ohms, are possibly buy some 8 ohm fosgates (P110S8) which are less of a speaker but will cost the same. Thanks for the feedback b/c I would have for sure run a 2 ohm load bridged from that amp.

 

[1sty]

Realisticly, the Type Es don't need much more then 125 watts each. More is always nice but not 100% neccassary. If you are going to use these subs then wire them in series to an 8 ohm load and then bridge the amp. This way atleast the subs are getting the exact same power and signal instead of trying to run them off of 2 different channels.

You could alwasy return the 2 12's and get 4 10's
Now 4 10" Type E's and the 500.2 would be the s*** (thumb)