Upgraded wiring, loss of output?

[SGSeeker 10+ year member]

I just finished replacing my 4 gauge run to the amps' distribution block with 1/0 gauge Kicker and swapped all my 1/0 under the hood with the Kicker and I appear to somehow have lost a ton of output afterwards. Settings on the headunit were changed back to what they were at before disconnecting the battery. Before, I was having to turn the subs down a bit (-4 to -10 depending on song) so they wouldn't overwhelm the front stage that runs off an Alpine PDX, now I can barely hear them, unless I crank it up +6 in the headunit. Yesterday I was driving along and had to have the volume turned up at 48/60 (I had set gains at 50) to get the same output level that I had previously used ~34 for...for both the subs and front stage. Any ideas on where to look before I need to pull the amps back out (they're deeply tucked within the vehicle) and recheck the gains (which I hadn't touched, nor moved the amps, only the wire going to the T-block)?

I don't see how a wiring change would cause this, especially after running additional grounds around the vehicle at the same time (along with the 0 gauge, made some new 10 gauge to chassis runs for certain electronics in the dash, with all grounds being connected together with a 2" long bolt). Grounds each get a perfect sized bolt into a chassis drilled hole which gets the paint ground off with a dremel, washers used, etc. Dielectric grease used where it could help. The connections are solid.

I figured that maybe my ears were just toning it down, but the wind noise was just as loud (or quiet, since its pretty deadened) as ever.

Ideas? Theories? Solutions?

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[docutech 10+ year member]

Sounds like there is still something you didnt set back to the way you had it set previously. What HU? Is the Defeat on or off?

 

[SGSeeker 10+ year member]

Pioneer DEH-7800MP, Two IB TC7 subs crossed at 63hz/18db, Aurum Cantis 7's in doors crossed at 80/12db, Older Eclipse 3.5" dash speakers (no dedicated tweeters yet) crossed at 160/12db, Eclipse XA1000 and Alpine PDX 2.150 amps. EQ's set to flat, as I get very even frequency response via the hardware. 4ft 1/0 from alternator to fuse block, fuse block to T-block, T-block to battery terminal and car fuse box, 1/0 run from battery terminal/fused to amps. All crossover adjustments are done via the headunit. I'm not really sure whats up. As for grounds, the battery has a 6" piece of 1/0 going to the chassis, 2 more 10awg 12" going to the chassis, one 4awg running to the engine block, and the alternator bracket being ground to the chassis with 1/0 (the smaller runs are factory, but with my 0awg/4awg/dual 8awg ground terminal, there's no reason not to leave them there). Unless set screws are used, everything's crimped, soldered, and heatshrinked.