Question about Alpine MRV-F345 Car Audio Amplifier

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Displays "CUR" When I turn on my radio and start raising the volume my amp shuts off at 20(out of 35) which is the limit on Alpine stereos (atleast mine). It had been doing this but after playing it at 30 for a half hour or so but know since you turn it on it starts shutting off. I'm using four gauge for the power and ground wires, thinking that it didn't have enough current, but i just read the manual's "troubleshooting section" (if you could call it that) and it says for the current display that it has too much current what could be causing that?; and its a stock car battery.

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Re: Displays "CUR"

You probably have too low of an impedance load on ot (too many speakers or wrong kind). It has to have a minimum of 2 ohms on each channel, or 4 ohms if bridged (that means don't put 2 subs on the bridge!!).

Posted on Sep 22, 2007

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Amp is only driving the subwoofer when in low volume. If i raise the volume amp shuts down and only works again if i turn power completely off.

Hi, please do the checks at the following post and let me know if you have questions;

Jun 04, 2011 | Alpine MRP-M500 Car Audio Amplifier

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Alpine mrv-f345 cuts off when...

Yes sounds like your not getting enuff power from the battery could be your alternator you should have it tested. Also have you try'd a capacitor? I put one in my car and it stopped cutting out...

Feb 05, 2010 | Alpine MRV-F345 Car Audio Amplifier

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I have an alpine mrd-m1001 getting curr message ho do you reset the amp

Hello deeprajm,

Shorted or low impedance outputs can cause the "CUR" display. Power down everything and remove the speaker wires. If it will then power up without the display, the problem is probably a short in the speaker wire or voice coil, or the impedance load is too low. If there are multiple subs, reconnect them one at a time to isolate the bad one and then correct the problem. If the amp works properly with either of the subs but not both, rewire the subs for a higher final impedance.

If the amp still displays "CUR" with the speakers disconnected, there's most likely an internal fault that requires component level repair.

Hope this helps.

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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

How do you get it out of cur mode

Hello whatup_132,

If the M605 fails and displays "CUR", it means that there is excessive current to the amp.

The most common causes for excessive current draw is operating the amp into a lower impedance than it is rated to handle, shorted speaker voice coil(s), and/or shorted or grounded speaker wires.

The amp can operate into a load no lower than 2ohms. First power everything off and disconnect the positive amp power lead temporarily (easist way is to just pull the fuse). At this point you should ONLY have the ground and remote connected. Reconnect positive (insert fuse) and turn on the vehicle ignition and your head unit. If the amp still displays the "CUR" error, the output MOSFET's are probably defective and the amp requires repair or replacement. If it powers up normally, reconnect the speaker wires until you locate the faulty one, and then correct whatever is causing it.

Hope this helps.

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1 Answer

CUR display

Hello yte1771,

You can download the manual from Crutchfield.

The "CUR" display is an indication of excessive current and is most likely caused by too low impedance or a fault in the wiring or the amp itself. It's probably not your cap.

Hope this helps.

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CUR on alpine MRD M 605

check your ground and make sure you battery power is connect properly

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The amp requires a compatible Ai-net Alpine head unit to operate it. I bought one too and didnt know this and im still trying to put all of the peices together to create a working stereo system without buying everything all over again.

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V-12 amp

Make sure you have the speakers wired up correctly to the amp and that there are no shorts in the wires.

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