Question about MTX RT404 Car Audio Amplifier

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Shorted a RH front speaker, now there is no output from RH channels at all

Hi, In our boat, a wire running to the Front RH speaker, was pinched in a steel on steel joint. The wire was cut thru and earthed on the frame, subsequently the RH channel (front and rear) is no longer working, the left works fine. Both speakers are also stuffed, when connected to the RH channel the magnets on the back of the speakers get hot. Is this fixable, or have we destroyed it? (BTW, we've already made changes to prevent the pinching happening again!) thanks in advance, Steve in Australia

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Re: Shorted a RH front speaker, now there is no output...

The output stage of the amplifier (RH channel) was probabla damaged from the grounded cable. The heat in the speaker means that the coil (d^speaker) is recieveng DC power from the damaged amplifier. Audio amplifiers are not special and can be fixed. In many cases, the output stage is a power MOSFET or a power audio amp IC. The only issue is the availability of the parts in your area.

Posted on Jun 14, 2007

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I have a boat with Clarion CM1635 speakers, how do I size the amp for my speakers

Hello cgregerson,

If you are running just the front channels to 2 CM1635's, you will need a 2-channel marine certified amp with approximately 50 watts RMS output per channel.

The MB Quart NAU-260 here would be a good inexpensive choice.

For a little more power and quality, I'd recommend the JL Audio M2150.

To run both front and rear channels, you need a 4-channel amp with 50 watts RMS per channel.

The Kicker MX350.4 marine certified amp would be a good choice.

Hope this helps.

Oct 14, 2009 | Cyclone Car Amplifiers

2 Answers

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

Do not have a sub output on receiver /do not know which wire to plug into the amp sub input/5 channel amp /have rca output for front and rear speakers

Hello southernbike,

With a 5-channel amp (stereo L/R front, stereo L/R rear, and subwoofer) you only need the two pair of stereo inputs.

You do not say which brand and model of amp you have, but most have an output configuration similar to the Alpine shown in this link. Connect the front and rear RCA's from your receiver, your vehicle speakers to the respective output terminals, and your subwoofer to the 5th channel terminals.

Hope this helps.

Jul 29, 2009 | Dual Car Amplifiers

1 Answer

Wiring Speaker to amp

remove all speaker connections to your amp. MAke sure the inputs are driving all 4 channels, and that the built in crossovers on the amp are all set to full range. Conect your full range speaker to each output channel one at a time and verify there is oputput on all 4 channels. If all is ok, then connect your rear speakers to the front(a) outputs of your 4 channel amp, and then use the second 2 channels (rear or B) bridged to drive the sub. Re-configure the crossovers for highpass for front (to drive your rear speakers) and lowpass for sub. This is the proper way to connect a 4 channel amp with a sup whle driving 2 full range speakers.

Jun 10, 2009 | Car Amplifiers

1 Answer

Ix406 front speaker distortion at all frequencies

Repair- "No". But make sure the power line is not running next to the RF speaker line nor the line in to amp more then a few inches to a foot. Often can cause distortion regardless.


Oct 28, 2008 | Kicker Car Amplifiers

1 Answer


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.

Mar 04, 2008 | Legacy - American II: 2 Channel 1200W...

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

Nov 07, 2007 | Rockford Fosgate Punch 300X Car Audio...

5 Answers

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!

Aug 14, 2007 | Sony XM-2150GSX Car Audio Amplifier

1 Answer

Red light 2

Probably not, as i said there are no user serviceable parts inside this unit. If the units worth it to ya take it in to be estimated. Good Luck

Jun 13, 2006 | Sony Xplod XM-554ZR Car Audio Amplifier

1 Answer

Red light

Have you disconnected the wire from the speaker?? and the amp?? Maybe the wire is pinched as I suggested?? If not then yes I would sy the peaker could be bad or the amp output on that channelis fried.

Jun 13, 2006 | Sony Xplod XM-554ZR Car Audio Amplifier

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