Well i have to do this , recently i upgrade my ICE Setup example in my signature, within 2 week i almost spend more than 15k setup above; I would like to share my experience with you all;
First 1st lastweek i use Debezt monoblock 1000w bridge to 1Ω to kick 2 x Rockford Fosgate T112D4 DVC 4Ω Dual (which each sub need 600w-1200w peak) both sub woffer need 1200w
So i add another monoblock same brand Debezt, 2 monoblock kick 2 sub parellel-wiring but guess what ? The monoblock over heat / lighting protection come out and in / sometime have woofer sound sometime cut off

Yes if your monoblock underpower will coz overheat n auto cut-off; to solve this change better monoblock [more power needed in watt]
at last the monoblock still under warranty, so change to Shuttle LAB 1700W class D monoblock [Prokick sister?] and really can kick 2 sub-woofer with series-parallel wiring at 1Ω [really awesome]
Car Battery:- N70Z/L AH75 12v [upgrading done]
Car Alternator:- Stock Toyota Corolla SEG
Battery 12v >> in-line fuse (front bonet) >> Prokick 2.0cap (rear bonet beside monoblock) >> Shuttle Lab monoblock (rear bonet) +ve from capicitor >> 2sub
ALL Cable 4AWG, Grounding Cable same as 4AWG (less than 1feet) to vehicle body chasis, sub 8AWG cable
Recent add:- 5 Point Grounding 4AWG Cable to Alternator 1point, Engine chasis 2point, CarBody 2point (adding because due to the vehicle engine spark / idle / electricity no enough stable)
Testing 1 Week already;
SQ Slow music which bass sound come slow 1 by 1 okie no problem at all;
SPL Bass like continuously coming in second, headlight dimming problem; everything light dimming; monoblock totally suck all the battery watt;
Today just add another Prokick 2.0digital farad on the shuttle lab monoblock, its only help a bit

[lesser dimming problem]
Future need to change bigger alternator / dynamo ? or got another way to solve this ?
Soon upgrade PXA-H100, Alpine minimum RMS per channel 100w 4Ω x 4 channel,
throw away my 6x9" useless boston acoustic (tweeter quite harsh sound) haha...
Btw add Raizin Volt Stabilizer will its help or not ? Coz today testing on my car, like nothing special happen de (what use of this item?)