Thread: PRA-H400 w/out HU power up

Can you post a picture of the power harness that plugs into the back of the H400?

If you can do that, i can tell you which wire (if any) is the remote wire. In the Alpine manual, it will tell you that if you don't have an ai-net head unit, you are going to need to use a remote turn on wire to turn the unit on. On my H701, the harness had all of the wires labeled (luckily), so i just used the amp turn on lead from my power supply to turn on the DSP.

Hope this helps...oh yeah, it was the blue wire comming out of the harness (yellow is power, black is ground).


EDIT: The reason why you don't need a turn on wire with an ai-net head unit is because the ai-net connection has this function incorporated.

Originally Posted by shefron

The wiring harness has 3 wires coming out of the unit. They are labeled

Yellow - battery
black - ground (no label)
blue - remote out


I've tried applying a 12 volt signal on the blue and yellow wires and a ground on the black but the unit will not power on. I'm thinking I'm screwed with this DSP.

Hmm...that's strange. It should power on if everything is connected properly. I would try and contact Alpine technical support directly (email or phone call) and ask them if it's possible to use the unit without the ai-net connection. I don't know if anybody else on here is using the 400 model (cuz they havn't chimed in), but maybe this model needs a controller. Do you have a controller to use with it? If not, how do you control it?

I couldn't find anything on that either...the best bet would be to send them an email and hope you get a quick response.

$150? That's a great deal...about the same price as a high end soundcard.

the 510's go around 150-200 depending & are one of the best bang for the buck.... the 400 should power up with +12v on yellow & blue, black -.... if it's not powering up then theres a problem....

the 510 is a much more versitale unit than the 400, which is mainly a high end crossover anyway... most high end installs will use 2 400's.... there are no modifications required to use either of these non ai-net from what I remember....