Question about Alpine MRV-F540 Car Audio Amplifier

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Car amp problem

Hi, i have a problem with my 4 channel amp firstly my front left speakere stopped working which i didnt get round to sorting out but now my amp keeps switching itself off and on again. If i keep the volume very low it seems to be ok. ive checked the earth wire which is ok and ive swapped the amp and the rca leads over but it stills switches off & on can you help please? Regards Lee

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Re: car amp problem

Make sure the front left wires arent shorting out if they are they could be causing the amp to overheat and shut down till`s its cooled ehough to restart

Posted on May 08, 2007

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I installed a 400 watt zapco competition amp\ front speakers play ...back woofers don't?

are you sure you didnt wire the amplifier the front and rear to
left/ right?

check your deck settings to see that the rear speaker rca are connected.
check all wires are connected.
push the mono or bridge buttons are off.

provide more info.

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Which speakers (Front/Rear) to buy that match Kenwood KAC-M846 4/3/2 Channel Amplifier.

I don,t no where you are reading thease articles from,I installed car audio equipment for over 40 years, Untill i retired a couple of months ago, Who ever is writeing those sort of articles does not have the slightest clue what they are talking about, It is the opposite way around, It is allway better for yor (Speakers) To handle more power then what your amp puts out, Then you will not blow the spaekers, It is best to get speakers at least 20 watts more then what your amps maximuin (RMS) Watts are, Hope this helps you out, (PS) 50 watts (RMS) Is what most people go for, It is in no means (Under) Powered.

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Car Audio - mixed ohm speakes - best setup

Here is the link how the speakers are suppose to be connected.

You notice how they hook it up the left connections are your full range or hi frequency speakers and the switch is on for HPF (High pass Filter meaning only high frequency is being passed thru)

The right connections are connected to subs and the switch is on for LPF (Low pass Filter meaning only low frequency is being passed thru)

If you turn off these switches to off the its FULL RANGE all frequencies will pass thru.

The single output of the radio is probably for a subwoofer output but since your using the amp to power speakers too Its useless because your sending only low frequencies to the amp which will make any speakers connected to the amp sound horrible due too all the highs and mids will be filtered out.

STEP 1. 2 4ohm speakers depending where you put them Front or back. Hook these speakers up to the Radio's speaker wires coming out of the radio harness. You can also call them Hi level output wires FR & FL wires if positioning them in the Front. Hook them to the RL or RR if positioning them in the Back. What ever wires you dont use tape them SEPARATELY . DO NOT TAPE THEM TOGETHER and cause them to touch each other it will short out the radio and you will hear no sound.

STEP 2. Ok get 4 same length speaker wires and cut them long enough to go too the amp. Now these speaker wires will only send the FULL RANGE frequency signals to your amp. So note with a paper and pen how your connecting each speaker wire. I would tape one wire with black tape to remember this is the FR right, 2 tape FR left, 3 tape BK right, 4 tape Bk left. And I would make the copper thread of the wire positive and silver thread of the wire negative (very important so that your in phase and it will sound awesome) mixing up the positive and negatives will give you a tinney sound and it horrible to hear .

STEP 3 connect these 4 speaker wires to the High level out speaker wires coming out of the radio. The wires that are already connected to the 2 4ohm speakers go ahead and splice into them and the ones you didnt use connect to the remaining 2/4 speakers. REMEMBER OR NOTE THE CONNECTIONS cause you have to connect the right sequence and right polarity + & - to the HI Level input of the AMP. You will not use any RCA'S from the radio to the amp anymore. Since your radio dont have any Front & Rear output coming from the back of the radio. (YOU CANNOT USE BOTH RCA INPUT & HI LEVEL INPUT OF THE AMP ITS 1 or the other OR YOU WILL BURN OUT THE AMP AND DAMAGE THE RADIO)

STEP 4. Now connect your 2 6ohm speakers of your front left and back left together in parallel and your 2 6ohm speakers of your front right and back right together in parallel. Look at the diagram hook it on the left connections as in the picture of the front left speaker(but your connecting two 6ohms valued at 3ohms when in parallel and the amp can handle 2ohms so its safe) Do the same connection for your two right speakers as shown in the diagram of the Front right speaker. SWITCH THE HPF to OFF so that you get full range out of your speakers. Mid range is 70% of your music if you turn it ON you are only getting the high frequencies and it will sound awful.

STEP 5. This is the final connection Your 6 ohm sub is very bad for this amp. For example if you bridge it off of the last two channels the amp may double the power. If each channel is 100 watts and you connect the positive to one channels positive and connect the negative to the others channel negative(presuming its bridgeable) On a regular 4ohm sub it will be getting 200 Watts of power which is an average thump. Now you put a 6 ohm sub it will be weak and it will be getting around 130Watts. To make it worse if this 4 Channel amp is not bridgeable you can only connect it to 1 channel and the output will be around 70 WATTS causing distortion due to lack of power. If you still connect the sub be sure the switch is ON.

Good luck cause this the best connection you can do anything different and I'm sorry it will sound even worse. I am a master installer and have done this for 12 yrs. The higher the ohms the worse the sound gets cause less power. Thats why car speakers are 4ohms and home speakers are 6 ohms or higher cause they have a bigger amplifier to power and 120volts AC current. A car only has a 12Volt DC current powering the amp.

Apr 06, 2010 | Sony Xplod XM-554ZR Car Audio Amplifier

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Front right speaker got wet, started cutting out. at the same time the rear right speaker started cutting. switched the rear speakers to opposite channels and this caused the right to work and left to cut....

the speaker getting wet will short it out. Shorting the output on any amp will ruin it. there is a right and left chanel with 2 outputs. Right chanel is damaged.

Sep 30, 2009 | Boston Acoustics GT-42 Car Audio Amplifier

1 Answer

How many speakers can I use?

This should work if channel 3 & 4 are bridged at 4 ohm.
channel 1 should be stable at 2ohm
channel 2 should be stable at 2 ohm
You can hook up the right side speakers together ( + with + and - with - ) . same thing with the left side. this will give you 2 ohm each channel. this will cause your amp to run hot (this might be tuff on the amp). It will give you right (2 speakers) and left ( 2 speakers ), no front and rear adjustement if you need to balance your sound. I think you should be better buying another amp for your sub and take your 4 channels for your 4 car speakers. this amp as a rca output that can feed the other amp ( sub amp ). it is possible to do it.

Good luck

Nov 11, 2008 | Alpine MRP-F250 Car Audio Amplifier

1 Answer

Ok this problem is killing me...

maybe the speaker is bad

First try one thing, switch the rca jacks around and see if the other speaker stops working this time.

If so the problem is in the rca jack or head unit.

If the same speaker is still not working, the problem will be the speaker, you will have no other options left since you changed amplifiers and checked all wiring.

Let me know if this helps you

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If you've got a standard 4 speaker system (2 front, 2 rear), your best option is to connect both left speakers to the left channel amp output and both right speakers to the right channel amp output. The only thing you lose is the ability to fade the speakers front to back.

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I recommend you swap your left and right input cables to make sure it's not a source issue.

So from your headunit, plug the left channel output into your amps right input and your right channel output into your amps left input.

If the same side is still not working then disconnect both (or single speaker if it bridged) the speakers from the not working side at the amp. Connect the front and then the rear speakers individually and retest to see if one of them works.

If one does work then check the cabling and speaker connections on the one that doesn't. If it's shorting out anywhere it will stop your amp from powering that channel.

Failing that, it could just be that your amp has partly failed.

Feb 15, 2008 | Boss Riot 1500D Car Audio Amplifier

1 Answer

2 channels not working on 4 channel amp

Well firstly are you using a parametric crossover with your radio and how much rca cables do you have coming you head unit (car radio) if you going to bridge the front up with you rear speakers u wont be able 2 hear the rear speakers try hookinking it up 2 your head unit's front speaker output and have ur rca cable connected to your amp running on your rear output of your head unit by doing this you can use your fader on your head unit to control your front and rear speakers

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Wiring Diagram for Sony car amplifier XM-554ZR

You can download the installation manual from the link below: It has the following diagram plus other hookup info... Please update the question & let us know if the information given was useful to you - Good Luck!

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