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    justin151's Avatar
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    Alpine mrp-m850 will power on but no power to sub

    Ok first of im new to this site so dont hate on me too much.
    I just bought the amp off a guy locally and went to hook that amp up to my Kicker s10l7. Once i got everything hooked up the amp would power on and i get the blue LED on but nothing comes out on the sub. I had a kicker amp installed right before i hooked this one up that had no issues at all. Now i took a multimeter and checked just about everything. I have 14v of power going to the amp. The remote wire has power and I have the amp selected on on my head unit. I also checker the output on the amp but now this is where i got confused. I have nothing showing coming out on multimeter with both pos and gnd hooked into the amp but if i just put the pos in and touch another ground point the VDC ranges (only playing a normal song) from 25 to 30. So i am not sure if the gnd transistor is blown on the amp or what?
    Does anyone have any ideas what else i could check?
    I dont think it is the sub cause its a dual 4 ohm wire down to 2 ohms to the amp. i double checked all the wires on it and it all seems good.
    I appreciate all the help and input anyone has to offer.
    One more thing does anyone know of any places in tn i could get the amp repaired if needed or anyone that would do it for cheap and fast? I am getting ready to deploy to afghanistan in two weeks and would like for it to be done before i leave.

    Thanks,
    Justin







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    Re: Alpine mrp-m850 will power on but no power to sub

    you want to measure VAC out of the amp between the terminals - you shouldn't have any DC voltage going to the sub. measuring DC voltage between outputs and chassis is just an issue of relative voltage.

    verify a connection didn't come loose during the swap - measure resistance at the speaker wires before they connect to the amp.

    call Alpine for the nearest service center - you'll have to ship it to them and it will take them a month or so (typically).

    good luck in Afghanistan - and thank you for serving our country.



    have you been helped by me? i'd love to know. shoot me a PM.

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    Re: Alpine mrp-m850 will power on but no power to sub

    on the head unit - do you mean you turned on the subwoofer output and turned up the sub level control (assuming you have that feature)?

    gain is properly set? crossover is properly set?



    have you been helped by me? i'd love to know. shoot me a PM.

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    Re: Alpine mrp-m850 will power on but no power to sub

    Hey man I appreaciate the help. I feel like an idiot though lol. I double checked in vac and it was working fine so I chase wiring on the sub itself. The wire splices I had were junk and didn't have any connection. The sub works great now just gotta tune up the amp. I'm so glad I don't have to drop a bunch of money to get it fixed. Thanks again for the help and the good luck.
    Justin




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