Question about Alpine MRV-F345 Car Audio Amplifier

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Amp will not power on at all

Hello I got a MRV-F353 V12 amp from a budy of mine, he told me that it used to work fine but some of the channels where burnt out, then one day it just quit working, so he let me have it to work on. I opened it up and found a couple risistors and transistors blown, so I replaced them. I took it to work to hook it up to my power supply and test it, but it still want power on. So my question is where should I start, Ive look for the wiring scamtic but was unable to locate one. Any help would be nice. Thank You

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Hello,

If you cant get the amp to work I would be interested in buying the top metal cover from you. Email me @
jhampton@phillipsllc.net

Thanks,
John

Posted on Jan 16, 2009

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Did you use the exact parts? did you also replace the pwm controller

Posted on Sep 16, 2008

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I just bought two rockford fosgate t1 twelves duel voice coil 4ohm I'm running a old school alpine v12 1507 mrv 2channel. I want to bridge the amp to get the most out of these subs would it be better...


Hi there,
This amp should run comfortable at 2 ohms/channel. However, your dual voice coil subs are rated at 4 ohms. This means when you connect the 2 voice coils together in parellel (positive to positive and negative to negative both coils wired to one output) the amp will see 2 ohms. So if you connect both subs to one output then your amp will see 1 ohm (not good) If you run the voice coils in parellel but the subs in series then the 2 resistances (ohms) will be added together. So that way the amp will se 4 ohms. This is fine but the amp would push more power into 2 ohms. You can run one sub on each channel if you can split the head unit output to 2 outputs, problem is then you will be halving the amount of power to each channel. Personally I would probably be more inclined to run 1 sub on this amp and run another amp from the pre-outs on the first amp for the 2nd sub. Try to find another amp the same to run the second sub. Mind you, 2 of these amps will need some big power cable to run them but should shake your teeth out!
Hope this helps

May 08, 2011 | Alpine Car Amplifiers

2 Answers

Alpine Amplifier Cuts in and out on Passenger side while driving


Make sure wirings are not pinched and try replacing the fuse as well.

May 01, 2008 | Alpine MRV-F345 Car Audio Amplifier

1 Answer

Lost instruction manual mrv-100m v12 car amp


Hello hlanderson,

You can download a copy from Alpine's support vault here.

Hope this helps.

Aug 13, 2009 | Alpine Car Amplifiers

1 Answer

Amplifier displays "CUR"


Hello anwbrown,

The "CUR" display means that the amp is drawing excessive current and the protection circuit is activating. Too low impedance or shorted speakers will cause the amp to draw excessive current.

The Alpine V12 is a Class D mono amp with only one set of speaker outputs. All versions, M301, M501, and M1001 are only stable to 2ohms. Assuming that all 6 of your connected subwoofers and speakers are 4ohm and they're all connected in parallel, the amp sees a .67 ohm load, far below it's rated impedance.

When brand new, the amp could probably operate at low to moderate volume levels without drawing excessive current. But as electronic components age, their tolerances change and they become less able to withstand excessive current or mismatched impedances.

I'd get a 4-channel amp and drive the 4" speakers off the front channels and the 6X9's off the rear channels. And just power the subs off the V12 making sure that they are connected to show a minimum load of 2ohms.

Hope this helps.

Jul 27, 2009 | Alpine MRV-F345 Car Audio Amplifier

1 Answer

Alpine mrv-f545 powers up but no power going to the channels


I suppose you checked all the usual suspects? Fuse, Ground, and Remote turn on?
Now if memory serves me isn't that an amp that has a digital display on the top? If so you have to scroll thru the menu items and see if it is on low pass or even off? The gains are tricky because they get louder with less dbs. but check the outputs.
if all else fails it's probalby bad.

Mar 16, 2009 | Alpine MRV-F545 Car Audio Amplifier

1 Answer

Alpine v12 amp no power


its your fuse box. i would bypass the fuse box and wire this amp directly to the battery via monster cable. make sure you attach a 30wieght fuse to the monster cable that is running from the battery to your amp. ground the amp against the trunk. scrape the paint of a section and drill a hole in the trunk. use this for the ground for you amp. this will fix the no power issue.

Feb 12, 2009 | Alpine MRV-T707 Car Audio Amplifier

1 Answer

MRV - 1507 Question ...


The MRV-1507 is a two channel amplifier, below I've pasted important info from the manual:

Battery Lead (Sold Separately)
Be sure to add a 80 amp fuse as close as possible
to the battery’s positive (+) terminal. This fuse will
protect your vehicle’s electrical system in case of a
short circuit. If you need to extend this lead, the wire
gauge should be AWG8 or larger.
MRV-1507 ... 80A amp fuse

Power Output: RMS Continuous Power (at 12.0V, 20 Hz to 20
kHz)
MRV-1507
Per channel into 4 ohms ......................... 150W, 0.08% THD
Per channel into 2 ohms .......................... 300W, 0.3% THD
Bridged into 4 ohms ................................ 600W, 0.3% THD

You can find a manual for this amp here:
http://www.alpine-usa.com/US-en/support/support_search.php?modelname=mrv-1507

Jul 07, 2008 | Alpine MRV-1507 Car Audio Amplifier

3 Answers

No power to amp


soundsto melike an underrated ground system. make sure that your ground cable is clean and is connected to the frame.

Sep 02, 2007 | Alpine MRV-F545 Car Audio Amplifier

1 Answer

Alpine Amplifier Cuts in and out on Passenger side while driving


this isnt a complex problem but both units may need service

Mar 12, 2007 | Alpine MRV-F345 Car Audio Amplifier

1 Answer

Amp heats up quickly, melts fuses and shut down after a while


It sounds like the power cable you have may be too small. If you're using an 8 gauge for both the power and the ground, try switching to a 4 gauge for both.

Aug 18, 2006 | Alpine MRV-F357 Car Audio Amplifier

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