Alpine HU and Sub controls

[_bent]

Alright fellas, I have had my system installed nearly a month now and while I am very pleased with the results, I am stumped on why I am unable to get control of the sub through the HU. I have all three RCA's plumbed from the HU to the Amp (Alpine MRV-F450). Amp is set to 5 channel operation per the manual. Channels 1/2 are in use for the components up front, channels 3/4 reserved for Mid drivers yet to be installed and channel 5 is on the Sub.

The HU (Alpine CDA-9847) is set to Subwoofer on and Sys2 according to the manual.

Any Alpine owners, past or present, have any ideas ?

Thanks !

[Bodydrop]

Does the unit do anything when you turn the sub control up or down?

[soundstream21]

If i remember correctly try holding the eject button down for like 10 sec that should turn the sub output on.

[nebraskaz71]

MY alpine does the same thing. You can turn the bass up to any level for sub on h/u and it makes no diff......... but i'm told thats cause i have amps on it ? lol i dunno

[_bent]

bodydrop - no, however the hu is setup per the manual for independent control of the subwoofer via the hu...

soundstream21 - What model do you have ? According the the owners manual for mine, the eject button works to, well, eject. nothing more...

nebraskaz71 - Thanks for the input. Good to know I am not the only one out there with this problem.

:cussing:

[soundstream21]

It was the 7844 its like 5 years old hehe i was just suggesting trying that.

[bignick31985]

Make sure the amplifier that is giving power to the subwoofer has it's RCA's hooked into the Sub-W set of pre-outs on the rear of the deck.

I had a similar problem when another shop installed my 7894. I could never adjust the bass with the Sub-W option. Then I re-installed in another vehicle, hooked the sub amp RCA's up to the Sub-W preouts and it was all good.

I can just press in my volume knob until my options are at Sub-W and adjust all the way up to 15.

My buddy's Alpine is the same way. I think he has the 9855 or somethign like that. I'm not sure, but I know it's the step up from my 7894 and one year newer.

[_bent]

Thanks bignick, tha'ts the first thing I checked. Wired correctly. Still no solution to this problem although I am waiting on a response from Alpine.

[_bent]

Thanks bignick, that is the first thing I checked. Wired correctly. Still no solution to this problem.