Question about Infinity 475A Car Audio Amplifier

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Sound loss Hi, I have a Alpine CDA9856 hu rf cpapacitor feeding a Infinity 475a for four speakers. In addition a RF 550 punch driving two 10' dual coil speakers. The front doors are Inf. component rears are Inf 5x7's. power led at amps are showing power. capacitor shows 12 volts. The sub lost power to speakers and currently the driver side component spker works and the pass. tweeter (only) works. Can I test for voltage at speaker terminals at amps for output? Do I use pos. prong at terminal and ground other prong to Chassis or amp? what voltage readings should I get? Can I test head unit at rca out/in?

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Bad system cofiguration too much load on rea amp

Posted on Jun 26, 2009


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I have a alpine CDE 152 head unit in my car and just put in alpine SPR 60 coaxial speakers in the rear. thought the head unit would be enough and want more punch from the base.. do i need an amp or i

get the alpine ktp445 mini amp ,it should be compatible (check your manual for your HU it will say ) its a plug and play install and you will hear a great improvement as I did and still got mine with the alpine cda 117 .

Apr 04, 2014 | Alpine Car Audio & Video

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RF p2d2 12 smoking

you cooked the coil in the sub when you see smoke you have clipped the sub. improper wiring probably the issue ohms must match gain must be set properly . if you had gain all the way up thats what did it.

Jun 20, 2013 | Rockford Fosgate Car Audio & Video

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When ever i dead key the mic on med rf power i get a humming or bumble bee sound through my talkback same thing on high rf power i changed the coax it helped it for low rf power and tried new mic but had...

Thats because your Rf is powerful on high settings..try taping a AM radio "ferrite bar" to your coax in the back of radio for "RF filtering". Keep your power supply 15 inches away from radio. I recommend unhooking talkback on radios (it always causes feedback). But make sure speaker is good distance from the radio. I'd say 10 feet or so, behind radio. Change external speakers or add one with a long cord.

Apr 23, 2011 | Ranger Virage VX-38 Base CB Radio

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The microwave appears to be working normally however it is doing absolutely nothing. The microwave plate broke and we used it without a plate for a short while. Could this have caused problems?

Hi and welcome to FixYa. I am Kelly.
Using the microwave may have caused an RF distribution problem. The RF is absorbed by what ever is rotating on the glass plate. Without the plate the RF can localize and be quite strong in an area then refract back into the magnetron. There is usually and RF filter over the wave guide to prevent this from happening on most microwaves. The refracted RF can make burn holes in the wave guide RF filter and then cause other problems like the diode to fail or the capacitor to overload and fail.

What you should do is check the diode assembly with an ohm meter. You to this by removing the chassis and shorting the capacitor at least 3 times with a screw-driver while holding only the handle. Failure to do so could flat out ruin your day if the high voltage capacitor is still good.
Then disconnect from the capacitor the lead that is connected to the diode. By using reversing the leads technique you will read resistance on one direction only. Reversing the leads it should read near infinity on an R X 10,000 scale. If it reads open or shorted in both directions the diode has failed and must be replaced. Additionally you should check the HV capacitor by applying the test leads then watch for a jump on the meter and then the meter returns to infinity. Reverse the leads several times and watch for a jump and then resistance rise to near infinity. If you do not see a jump or... it reads continuity constantly the HV capacitor has failed. The Diode and HV capacitor are not really unit specific and generic parts can be used IF they are a suitable sub per the appliance parts source you seek.

It is possible that the magnetron has failed but usually if a magnetron fails there is an associate LOUD buzzing sound when the unit is operating. I think you have either a failed Diode or HV capacitor. Testing per instructions above and replacing the failed part should return your microwave to normal service.

If you have nor replaced the glass plate please do so in conjunction with your repairs. Also inspect the RF window for burn holes. Replace if necessary.

Thanks for choosing FixYa,

Nov 02, 2010 | LG Microwave Ovens

1 Answer

No sound from RF & RR speakers

run new wire to the speakers is what i would do but u have to do it to all due to there possibly being a pre amp in the vehicle.

Oct 24, 2009 | 1999 Dodge Ram

1 Answer

Rear speakers do not work with aftermarket stereo install

I had the same problem a while back after having a JVC MP£ player fitted at Halfords. The guy told me my sub-woofer behind the back seat wouldn't work with the new stereo which I said was ridiculous, then one of the other guys came to look and told him I needed a different cable to link everything together - then it worked brilliantly.
Sorry I dont know a part number but that is definately your problem.
I hope this helps - or better still that you already have it sorted !!

Feb 09, 2009 | 1998 Audi Cabriolet

1 Answer

Is this ok?

yes 2ohm should be fine for that amp no problem

But dont bridge it any lower than 2 ohms.

Nov 26, 2008 | Rockford Fosgate Punch P4004 Car Audio...

2 Answers

Alpine mrd m500 amp is not pushing my 12 in infinity sub

If you have a dual voice coil sub, make sure that you have the positive and negative terminals connected properly. If you have ONE of the coils wired backwards, it will cause the speaker to produce little or no sound.

Have you set the gains properly?

Are you sure the amplifier is receiving a strong signal from the head unit?

Have you tried it with a different speaker?

Jul 19, 2008 | Alpine MRD-M1000 Car Audio Amplifier

1 Answer

Component speaker not working

The easiest thing to test is to try swapping the connections of the front component speakers at the amp connections. If the problem follows the speakers, the issue is probably with the speakers. I would triple check (again) the speaker wire connections. It's also possible the crossover for the driver side component speakers has an issue (thus why the tweeter worked for a while).

If the problem stays on the drivers side, the issue is probably with that channel on the amp. Triple check the RCA connections for that channel.

It's much easier to test other speakers on an amp channel versus trying to check it with a meter.

If the driver's door is "abused" often, my initial thought is the wiring at the speaker or the wiring in the speaker (to voice coil, within the crossover, etc) is the most likely culprit.

Apr 10, 2008 | Infinity 475A Car Audio Amplifier

1 Answer

P2002 Amp is weak

Please provide details on the head unit, sub box, and sub box location of both your old setup and your neighbor's new setup.

Feb 26, 2008 | Rockford Fosgate Punch P5002 Car Audio...

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