Factory Subs not working after amp install.

[Lensman]

Hi all. I'm new to this so go easy please

My current car audio is basically stock, with a Blaupunkt head unit and 2 x 8" subs powered by a small factory sub amp. The sub amp picks up it's feed from the rear door speakers. I have upgraded all the door speakers to JBL GTO638's and they sound good but I wanted a little more power so I've added a Kenwood KAC-M3004 4 channel amp that has speaker level inputs. Funny thing is the subs no longer work. If I take the amp out of the loop the subs work again. I've fiddled with the gain, LPF's and HPF's on the amp but no combination of anything will get the subs to fire up with the Kenwood amp connected.

I can only assume there is something about the signal being sent to the sub amp it doesn't like. Can anyone help?

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[BOOMINGRANDPA 5,000+ posts]

yeah sounds like u r amping signal to another amp that way.. other than getting a sub amp maybe another sub or just run rear speakers off hu instead of amp idk..

 

[garychoffmann 10+ year member]

How are you running the kenwood amp as far as input is concerned? Are you running rca's or using the high input?

 

[Lensman]

Hi garychoffmann. Thank-you. There are no RCA outs on the Blaupunkt head unit so I'm using the speaker level (high inputs).

Hi BOOMINGRADPA. Thanks. It might be that I have to run some extra cables from the HU to the rear sub amp if I can't work this out. That should work.