Soundstreams are good. If you want to stay with 2 tens, maybe all you need is a bigger amp. It is ok to overpower your subs by double, so depending on what model Naks you have, you may be ok. How is your electrical set up?

I put some 4 gwa power cable from the battery to my amp before getting separate in 3, 1 for each of my amp (front, rear, subs) and I put an 8 gwa ground cable.

My subs are powered by some 8 or 10 gwa (not quiet sure) and I put some great RCA wire, some phoenix gold wire.. well that's it.

Ground cable needs to be at least same size as your 4 gauge power cable, cause you are losing power right there, and it needs to be attached to bare metal(not paint). Hopefully you fused the power cable near the hood battery with ANL fuse of 125 amps. This way you'll be getting the most out of your wiring. If you have a 3-way splitter, and it is fused as well, make sure fuse size is correct as well depending on size of power cable going into your amps.

FUSES

I fuse my system near the battery with a 60A fuse (what I calculated has needed from what amps' spec were) and the ground is direct on metal... but I haven't done much more than this.

Replace that ground with 4 gauge at least. 60 amp fuse is crap and is easily meltable, thus increasing resistance and losing a LOT of performance. That type of fuse(glass probably) is crap. Get ANL, which looks like a fork sort of, and 4 gauge cable can take up to 125 amps. It has nothing to do with amp rating, it is there for power wire protection, but for 4 gauge, do not go higher than 125. You do these things and I guarantee night and day performance difference.

well I put I fuse similar to the model you have in your car already, I've put it into a fuse older, don't remember the brand... but I don't really understand the point of having a fuse of 125 a. I was thinking that we fused the system to protect our amp not our wire ??? You really lost me there, can you help me a bit more. And how you know the rating for this size of wire ?? have you any chart of that ?(this could be useful)

Here you go buddy!

FUSES

__________________
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Alpine 9887
Steg K2.03 > 1.2" CDT ES-010, 7.1" CDT ES-07, CDT 560i
Arc Audio KS1000.1 > 2 x 12" Arc Audio D4's(Arc Series)
Rockford Fosgate Riot Cables
Monster Cable 300 Series Speaker Wire
Focal Plain-Chants
Dynamat
Monster Cable 2-Farad Cap
Optima Yellow Top
180 amp Iraggi Amputator alt

"It sounds so good - it hurts my face" - Sasha

Steg > good price at www.number1sound.com
CDT > good price through Ross on CCA

are the current type of fuse i'm using is good enough ??

^^^ Please read my previous post.