[beason]

If your amp has high level input you can just use the wires running to the stock sub. If your amp does not, you will need a LOC, and again you can use the wires running to the stock sub.

I think the REQ is a LOC but also a preamp. Stock radios have a dendency to mute the lower frequencies at higher volume because the stock speakers arent built to handle it. The REQ gives this back.

There are 2 pairs of wire running to the stock sub. I used these to connect to the 2 pairs on my LOC, and it works fine.

 

[ClashOfTheTundra]

So id basically run from the stock amp (presume thats built into the head unit?) out through the REQ to improve things, then into the amp?

This is the amp I have: Alpine MRP-M1000 Mono subwoofer amplifier 1,000 watts RMS x 1 at 2 ohms - Features & Specs at Crutchfield.com

Says speaker level input=harness.

 

[beason]

with that amp you can use the harness, but if you want better SQ you use the REQ and the low level inputs. (RCA)

you are correct on the wireing order. but the stock amp is actually under the dash on the pass side i think.

 

[ClashOfTheTundra]

Great! thank you!

I did already buy this req... just hope its the right one.

Amazon.com: MTX RE-Q 3-Ch Bass Restoration Module: Automotive

 

[edgar3432]

ok , so I have 2004 titan with the rockfordfosgate hu. I want to add my aftermarkt amp and subs to the factory rf head unit so I got the loc. my question is can I tap into the rear speakers instead of messing w the factory hu.? also in order to get my subs and aftermrkt amp to wrk do I need to bypass the factory rf amp? thnk u 7