Question about Sony XM-404EQX Car Audio Amplifier

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All three lights are lit the amp is obviously hooked up but getting no sound from the subs

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Be sure you audio jacks are plugged in all the way and in the right locations

Posted on Nov 08, 2010

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1 Answer

No sound from subs


You need power to the amp. If the light on the amp is not on then your amp is the problem. Get power to it.

Nov 10, 2013 | Phoenix Gold Xenon-400.1 Car Audio...

1 Answer

Hooked up the amp, lights up, fans kick on and run fine, speakers hooked up proper, no sound? hooked up speakers to another amp and they work fine. Fuses are all good too. Thoughts?


could be bad rca cables or no output from the radio rca outputs. the sub control may be turned off on the radio (ive seen that alot at my work). if all that is fine, the amplifier may be bad. the rca cables may be plugged into the "out" section of the amp. gotta look at all the small obvious things first. good luck.

Dec 18, 2009 | AudioBahn A2300HCT Car Audio Amplifier

1 Answer

Sub not working and red light on amp stays on?


the amp is under to much pressure get a bigger 1

Nov 18, 2009 | MTX Thunder 421D Car Audio Amplifier

3 Answers

Wiring diagram


run them in sereis hooking them all up together and bridging the amp

Jul 22, 2009 | Rockford Fosgate Power 1500BD Car Audio...

1 Answer

Subwoofers pop then immediately produce no sound


Sounds like the two subs wired together might be too much of a load on the amp and it is shutting off. Try wiring the two subs in series. That will reduce the load on the amp but will conversely put out less power. Less is better than none though. In any case check your amp to see what the lowest ohm rating it can see, that ohm rating is where you want your subs and if faced with a choice of either going under (lower numerically) or over (higher numerically) GO OVER!-it is much safer.
Here's an article I wrote that can help explain how to wire the subs to the amp.

OHM LOADS, SUB WIRING, OHM RELATED POWER OUTPUT

SERIES SUBWOOFER WIRING
Wire the positive pole from one voice coil (using wire that is as thick or thicker than your wire from amp to sub) to the negative pole of the other voice coil (on the same sub). This will leave you with a positive pole from one voice coil and a negative pole from the other giving you the two leads that will be hooked up to the amplifier or other subs. When wiring in series, the ohms will go up numerically, and the load on the amp will go down. Almost all amplifiers power output will follow this rule, except some amps such as JL Audio's “Ohm matching” D Class amps.

PARALLEL SUBWOOFER WIRING
Wire the positive pole from one voice coil (using wire that is as thick or thicker than your wire from amp to sub) to the positive pole of the other voice coil (on the same sub). Then wire the negative to the negative in the same way. You can then wire to the amp or other subs. When wiring in parallel the ohms will go down numerically, and the load on the amp will go up. Almost all amplifiers power output will follow this rule, except some amps such as JL Audio's “Ohm matching” D Class amps.

MULTIPLE SUBS USING SERIES AND PARALLEL WIRING
In order to match your amplifiers ohm rating you can use parallel and series wiring together, just keep things even for power distribution and to avoid phase issues.
Example: I have two “Type X 12” subs” that have dual 2ohm voice coils and have to match my “Amplifier X” ohm rating of 2ohms mono. In this case, I would wire each subwoofer in series (giving me a 4ohm load), and then wire the two subs in parallel to get my 2ohm mono load. When wiring multiple subs just, treat each sub as a voice coil and wire accordingly.

POWER OUTPUT AND OHM LOADS
For example if “Amplifier X” can make 100watts@8ohms, it would make 200watts@4ohms and 400watts@2ohms. However with every drop in ohms the amplifier is put under more pressure. It starts to create a lot of heat, distortion figures begin to climb, damping rates drop, and some amps even throw power spikes when clipping. SO BE SURE TO CHECK YOUR AMPS RATING AND DO NOT EXCEED IT!

-Dynami

Apr 04, 2009 | Alpine Car Audio & Video

3 Answers

KAC-9102d no sound, Amp powers on but no sound to the subs.


If the sub isn't working, you won't get a pop. All you need is a small speaker. Don't need a sub, you just want to test the sound. I recently blew 2 subs, no smoke, no smell, no sign of being blown. Absolutely nothing from the subs.... In the past my sub locked up. You can take your sub out of the box and hook the + and - to the battery to see if you can get the sub to pop there. I believe a small box will push a sub into a deep excursion to the center of the cone. I have 2 lanzar VW12D's that just quit. I hooked a 6 x 9 up to my amp and low and behold I had sound! Try that and see what you get...

Feb 07, 2009 | Kenwood KAC-9102D Car Audio Amplifier

1 Answer

Subs sound terrible (Ive tried so many things)


NO it won't be your battery. Sounds more like your deck.

Jan 22, 2009 | Jl Audio 12W3 Car Subwoofer

1 Answer

Amp and Stereo hooked up, no sound coming from the sub


It sounds as though either the sub or amp is blown. When an amp blows quite often the light will still light, but the internals are trashed. The only surefire way to tell whats going on is to use a Digital Multi-meter to check the impedance of the sub, and the voltage at the amp. You can get a multimeter as cheap as $10 at most autoparts stores, Radioshack, Sears, etc...
Also, always post brand names and model numbers, because more info equals more help.

Apr 30, 2008 | Car Audio & Video

1 Answer

Low amp output


Make sure the BOSS isn't in "Protected" mode (Red led lit) and connect the speakers properly (check the connections if they are in "bridged" mode).
Also, make sure you set the cross-over, bass boost setting, bass volume control and the bridge mode according to the speakers you are connecting. Check the input level too.
The BOSS amplifiers are of very poor quality and it can be easily broken. Maybe yours is broken.

Feb 15, 2008 | Jl Audio E2150 Car Audio Amplifier

1 Answer

Car audio


hi, your amp seems to be getting power but the cables might be wrong so it's not getting enough power. the light on the amp should be green if everything is going well. are you sure the cables are suitable for your amp?

Sep 11, 2007 | MTX RT202 Car Audio Amplifier

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