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

Posted by Steven Hurst on

  • Steven Hurst Jun 17, 2007

    thanks, that is very helpful, but how would I test the mosfets? Do you have any idea where I could get a circuit diagram for the amp?

    thanks,

    Steve

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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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Won't stay powered on. Clicks off within few seconds. Amber power light stays on.
Could be speaker wires shorted together, but it is more likely that there is a fault in the output transistors or the power supply. The front right and left normally produce the most sound output and those transistors run hotter than the other channels. If you have the equipment and know how to check the output transistors, I would start there.

May 05, 2015 | NAD T747

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I have a motorcycle that I am installing a marine grade stereo on. I only have room for 2 speakers on the bike but the stereo head unit has 4 output channels. Should I run the two speakers from one side...
Run either just the fronts or the rears. Do not tie any speaker wires together as that will damage your output ic.

Jul 26, 2011 | Car Audio & Video

1 Answer

Need instructions to replace the passenger side mirror and the driver side tail light on a 1999 Ford Taurus 4-door sedan. Thank you, Gary S.
Section 01-09: Mirrors, Rear View 1999 Taurus/Sable Workshop Manual REMOVAL AND INSTALLATION Procedure revision date: 06/25/1998 Mirror, Power-Outside Rear View Removal
  1. Disconnect battery ground cable (14301).
  1. Remove front door trim panel (23942). Refer to Section 01-05.
  1. Remove radio speaker grille from cover assembly by squeezing or pinching between thumb and index finger.
  1. Remove two screws from cover assembly.
  1. Disconnect outside rearview mirror wiring connector (C515-LH; C615-RH). Remove wiring guides as necessary.
  1. Remove three outside rear view mirror retaining nuts. Remove outside rear view mirror (17682) while guiding wiring and connector through hole in door.


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Item Part Number Description 1 17682 Outside Rear View Mirror 2 N621906-S36 Nut (3 Req'd) 3 F8DB-17D699-
AAW Cover Assembly Rear Substrate-LH 3 F8DB-17D698-
AAW Cover Assembly Rear Substrate-RH 4 N808968 Screw 5 F8DB-18B984-
AAW Speaker Grille-Standard (No Badge)-LH 5 F8DB-18985-
AAW Speaker Grille-Standard (No Badge)-RH 5 F8DB-18K901-
BAW Speaker Grille-Mach-LH 5 F8DB-18978-
BAW Speaker Grille-Mach-RH 5 F8DB-238A35-
AAW Speaker Grille-Blank (No Speaker)-LH 5 F8DB-238A34-
AAW Speaker Grille-Blank (No Speaker)-RH A - Tighten to 6-8 Nm (54-70 lb-in) ------------------
Trim Panel, Door Front
Removal
  1. Remove cover behind inside door handle.
  1. Remove screw from bottom of pull cup retaining front door trim panel to front door (20124).
  1. Remove three screws retaining front door trim panel to front door.
  1. NOTE: Do not attempt to remove more than one pushpin at a time.

    Using Rotunda Windshield and Molding Trim Removal Kit 107-R0401 or equivalent, remove the door trim panel by pulling one door trim panel pushpin at a time from the inner door skin.
  1. Disconnect electrical connectors as necessary. Refer to Section 01-14A.
Installation
  1. Follow removal procedure in reverse order.
  1. Replace all pushpins with new pushpins (N808994-S).
Front Door Trim Panel


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Jan 14, 2011 | 1999 Ford Taurus

1 Answer

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 Audio & Video

1 Answer

I am trying to install my xtant 604x after i just had it sent out and repaired. I have 4 rca's coming from the head unit wired to the amp as FL, FR,RR,RL. The front speakers connected to the front output...
CLICK HERE for your Owners manual in PDF format
CLICK HERE for your Installation Guide in PDF format

As we agreed in chat - you are going to run your 4 channel amplifier as follows...

Front Channels of amplifier will run left and right independently.
Wire up the left speakers in parallel all + together and all - together.
This will yield a 2 Ohm load.

To the Same with the Right Side speakers - on the FRONT Right channel of the amplifier.

Now you have a 2ohm stereo load on the FRONT channels of your amplifier.

And using the BRIDGED nomenclature on the REAR channels of your amplifier - wire up your 4ohm sub mono.

Here is a crude drawing for a visual

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Thanks for using FixYa - a 4 THUMB rating is appreciated.



Sep 05, 2009 | Car Audio & Video

1 Answer

Speakers Crack at mid to high volume (anything over level 20)
make sure speakers are connected properly to individual speaker outputs from radio .Also make sure speaker cables going to speakers are not pinched or shorted anywhere

Jul 30, 2009 | Jensen CD400M CD Player

1 Answer

The output to the front left channel is low
Try adjusting level calibration for the front left speaker under setup. This should solve your problem.

Mar 11, 2009 | Onkyo TX-SR705 Receiver

1 Answer

Installation
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...

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Wiring Diagram for Sony car amplifier XM-554ZR
You can download the installation manual from the link below: http://www.sony.co.id/support/product/xm-554zr?site=hp_en_ID_i 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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