2000 denali sub and amp install

I am installing an arc audio 1000.2 i want to run it bridged mono to power 2 eclipse 12" subs in a sealed box. I hooked the power up correctly but i am having trouble with the sound. The amp has a built in high to low level converter so i connected the wires going to the rear speakers to the amp. I am barley getting any sound out of the subs with the gain at 100% any ideas on what might be wrong?? Also when i press the break petal, hazard lights etc. there is a slight popping noise from the subs.. Thanks for your help

High level signals such as the ones from you rear speakers are infested with noise.  The factory speaker wires run in a big clump of wires, and noise is radiated through the speaker wires.  In this case i have gained a better signal and volume by installing a quality " adjustable line output converter" directly behind the head unit, and run your rca wires from there to the sub amp.2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.