Question about Alpine MRV-F345 Car Audio Amplifier

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Wiring door speakers

I just got this new amp and i was wanting to hook them up to my aftermarket door speakers. I have a 2004 Honda Accord EX. Thanks

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Just make sure that the speakers are the correct impedance and properly rated. If not, the amp can be damaged.

Jerry G.

Posted on May 01, 2008

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Can i hook up aftermarket amp if so how


yes, buy a hi/low converter like this:
http://www.ebay.com/itm/HI-LEVEL-INPUT-ADAPTER-HI-LOW-ADAPTER-AMP-INSTALLATION-/200738024366?pt=Car_Audio_Video&hash=item2ebceb2bae&vxp=mtr

that connects to a speaker you have and gives you RCA connections for you amp. follow the diagram included in your purchase of your hi/lo converter.

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Amplifier is not working for my 2004 infiniti


That's a common problem. If you checked all the fuses for the radio and amp (under the dash and under the hood) and they are good. More than likely the amp is done. You will have to replace the amp or, install a new aftermarket amp and power the speakers from there.

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2010 Accord - HU extra signal?


SOUNDS LIKE YOU MAY HAVE A BAD GROUND CONNECTION TRY THAT FIRST THEN RITE BACK SO I CAN HELP U TRY AND FIGURE OUT UR PROBLEM SHOULDNT B 2 BIG OF A DEAL THOUGH LET ME KNOW BRO

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I have 1000 watt sony XPLOD amp and i just installed it today. with new monster cable&ground. the green light turns on& thumping goes for a little. i try to raise up just a little bit& after 2...


it isnt getting enough power and its tripping the internal switch on the amp and putting it in safe mode. either your wire isnt a high enough gauge. you might need a capacitor or you need bigger wire.

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1 Answer

Wiring problem


If you have an aftermarket stereo, the hook up is fairly simple. On your amp there should be a minimum of 5 terminals and an audio input. one is for remote which is connected to the blue wire on your stereo. Second is your ground which is your negative connection. it should be connected to the body of the car close to the frame. Third is your hotwire which is the positive lead, it should go straight to your battery. The fourth and fifth are speaker wires, you may have 2 or more of these that have + and - signs above or below them. When wiring the speakers make sure to match the positive and negative connections on the speakers. If your rewiring all of the door speakers to your new amp then the colors that you see once you have them out are the colors you route to the appropriate locations on your amp. If this is for a sub then you just the connect th positive terminal on the sub which is red to the + on the amp and the black terminal on the sub the the - location on the amp.

Lastley there should be an audio input that runs from your stereo to your amplifier. This wire should be ran as far away from the positive wire as possible to avoid engine noise coming through your speakers.

Jun 01, 2009 | Earthquake Sound XTREME 900W.5 Car Audio...

1 Answer

Can't get my amplifier to work.


My homie had the same problem with his escalade they adapted an rca line adapter from the factory wiring to geta signal to his amplifier and it just wasnt hitting like it should so we installed a new deck and plugged the rca cords right into it and boomboom pow it was hittin like a champ-we figured that the stock premium system that was incoprporated into the truck had some sort of an onboard amp that was filtering the bass from the door speakers and which was limiting the bass output to the rca adapter and thus on down the line to the amplifier- so maybe ya might want to look into getting an aftermarket deck and see if that helps your cause-good luck

May 21, 2009 | Alpine MRP-M450 Car Audio Amplifier

1 Answer

Hello, I have a 2000 VW passat with a Monsoon radio system. How do you install a new head unit and speakers while maintaining the factory amp? If this is impossible, Can I use the current speaker wires...


Hello ctr1russo,
While it's not impossible to install a new head unit and speakers and leave the factory amp, it'll be a real bear of an install.
In order to work, the Monsoon amp needs 6v which is provided on the speaker leads. An aftermarket head unit will not provide that. Best to just install a new amp.
You should be able to use the wiring, including the speaker wiring, with no problems.
Check out www.bestkits.com for the appropriate adapters and wiring harness for Monsoon equipped vehicles. Just enter your vehicle info and it should bring up the required adapters and harnesses to make everything work properly.
There are three ways to connect more than one speaker to a single channel: 1) Parallel - both speaker +'s and -'s wired together - load impedance will be halved (2 4-ohm speakers in parallel equal a 2-ohm load). 2) Series - The + of one speaker wired to the - on the other speaker and the remaining + and - going to the channel output - load impedance will be doubled (2 4-ohm speakers wired in series equal an 8-ohm load). 3) Using a crossover - connect the bass speaker (woofer) and the input of a high-pass filter directly to the channel output and the treble (tweeter) speaker to the output side of the filter. In any of these connections, you want to make sure that the load (ohms) your amp "sees" is not less than it is rated for. Most amps will work into a 4-ohm or a 2-ohm load with no problems. Going below 2-ohms is bad, because it will cause the amp to overheat and possible fail. Going above 4-ohms is no problem for the amp, but it won't produce as much power (watts) at the higher impedance and your speakers will not be as loud as they could be.
Hope this helps. If it does, please rate as "FixYa:. Thanks!

Apr 21, 2009 | Car Amplifiers

1 Answer

Hooking up a new 8" woofer speaker to my amplifier


If I'm reading the amp manual right, you should be able to connect the amp in 3 channel mode. To do this:
  • Connect both left door speakers in parallel to Ch A Left.
  • Connect both right door speakers in parallel to Ch A Right.
  • Bridge Ch B and connect it to the new 8" sub.
  • Set the Ch A LPF/HPF to HPF.
  • Set the Ch B LPF/HPF to LPF.
This should allow you to run all 4 door speakers and the sub from the amp. It will also automatically route non-bass to the door speakers and "only bass" to the sub.

Mar 22, 2008 | Pioneer GM-6300F Car Audio Amplifier

1 Answer

Another question for zzedly about the speakers cutting out


So, as I see it, your system is hooked up like so:
  • Ch1 = Left speakers, front and back
  • Ch2 = Right speakers, front and back
  • Ch3 = One sub
  • Ch4 = Other sub
One thing you can try is swapping channels. Swap Ch1 with Ch3 and Ch2 with Ch4. Then see if the issue still occurs on the door speakers or do the subs suddenly cut out at loud volume. If the subs start cutting out, that means the issue is with Ch1 and Ch2. If you haven't already, check the RCA connections to Ch1 and Ch2 as well as the gain for all channels. If the gain isn't already set to about 50%, put it there.

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