New amp giving me the finger...

[AndyWood7 10+ year member]

So I got a new MB Quart Onyx 1.1500D a couple days ago and decided to swap it into my current setup to test it out. I ran it to a pair of older Kenwood 12's, SVC 4ohms. Wired it for a 2 ohm impedance for the amp. Hard to get it wrong with single coils....Triple checked my connections and even followed the manufactures installation startup process. Zeroed all my knobs, etc. Nothing going to my subs. I know the subs are good, I had them playing before I switch out the amps.

Everything looks fine. The amp is powered up, not protected. Yet zero output from the subs.......?

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[MONSONwarrior Premium Member]

check the actual A/C output from your amp with a DMM. you may have a bad amp.

or your H/U may have a subwoofer setting that got turned off accidentally.

 

[AndyWood7 10+ year member]

check the actual A/C output from your amp with a DMM. you may have a bad amp.
or your H/U may have a subwoofer setting that got turned off accidentally.

What type of sub setting might I be looking for? Something other than the dB adjustment?

 

[Phoenix Risen 10+ year member]

if you have one it will say sub on/off

also make sure you have the speaker wires in the right spots. someone local had this problem at first, he put both speakers wires into positive terminals

 

[AndyWood7 10+ year member]

I will have to bust out the DMM tomorrow and check things. I pretty sure I don't have the on/off option.

 

[daboyfrumdabx 10+ year member]

So I got a new MB Quart Onyx 1.1500D a couple days ago and decided to swap it into my current setup to test it out. I ran it to a pair of older Kenwood 12's, SVC 4ohms. Wired it for a 2 ohm impedance for the amp. Hard to get it wrong with single coils....Triple checked my connections and even followed the manufactures installation startup process. Zeroed all my knobs, etc. Nothing going to my subs. I know the subs are good, I had them playing before I switch out the amps.
Everything looks fine. The amp is powered up, not protected. Yet zero output from the subs.......?

Did you "unzero" the gain knob once it was all hooked up?

 

[AndyWood7 10+ year member]

Yes. I halfwayed most of the knobs after I powered it up to see.

 

[Phoenix Risen 10+ year member]

did you check which terminals you have the speaker wires on, i know sounds stupid but can be easy to do.

 

[AndyWood7 10+ year member]

So I got a hold a DMM finally. I'm not the best with these, but I took a solid states circuits class like 5 years ago and haven't used one since. Anyway I powered up the amp, turned the DMM to DC, black to neg, red to pos on the speaker outs. Getting 0 Volts. So it appears my new amp is not putting power to my subs.

Seems unusual, but my rca's are in the sub out on the HU. Would it help to try them on the full range out?

 

[dragonrage 10+ year member]

Yes it would indeed. Or try a portable CD player or MP3 player or your phone.

 

[SpeedEuphoria 10+ year member]

check the master slave or filters on the amp

 

[daboyfrumdabx 10+ year member]

You should be measuring AC voltage on the speaker outputs, not DC.

 

[AndyWood7 10+ year member]

Right!...check that

It's reading about .5-.6 Volts AC. Does that sound right?

 

[AndyWood7 10+ year member]

So I got a step closer tonight. I plugged my phone into the rca jacks on the amp and played from my mp3 player. So the amp appears fine. Of course I had to tear apart the whole mother f'ing dash apart again to get to my rca's on the HU, but whatever. I switched the preouts from sub/rear to front(full range). Still nada. So it would appear I have a problem between the rca's and the HU.

I can't find any settings that are screwed up on the HU. I even reset it and switched around the preouts again. Could something be wrong with my rca's? Is there a way to test them?

 

[AndyWood7 10+ year member]

check the master slave or filters on the amp

Don't think I can. My amp is not bridgeable.