I just bought a car with an MP528 and it was working. It had a subwoofer and front and rear speakers, plus sub amp and another main speaker amp. I removed all this stuff and gave it to my grandson and after doing so I only wanted to connect it to the remaining front kick panel speakers, i.e. plain old stereo. After connecting the four speaker wires, the system no longer works (no audio).
I went into the menu and turned on the built-in amp, but still no audio. The tuner is apparently working as I get a stereo indicator when tuned to a valid station.
Also, on the upper left of the panel above the "volume" knob, there is a red indicator that is lit. It shows in the manual photos, but could find no mention of it anywhere to say what it's for. (Maybe it's telling me some kind of mute or error condition exists???)
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Re: "Mystery" indicator and no audio
The problem with the audio must be a problem with how the speakers are connected. You do not need to turn on the internal amplifier in this radio, it is always on. You said you connected the four speaker wires to the two speakers. You may have used the wrong wires. The front speaker wires from the radio are the white, white with black stripe for one speaker and the grey, grey with black stripe for the other front speaker. make sure each speaker you are connecting has the matching colors from the radio connected to it. meaning that one speaker will have a white wire and a white with black stripe wire, the other speaker will have the grey wire and the grey with black stripe wire. The purple and green wires should be seperated and insulated off from each other so that nothing can touch them that has any conductive surface.
The red led indicator is just for knowing that the radio is on. No other function for that. The muting for these is called "ATT" for attenuation and is located in the top left of the face.
make sure your speakers (terminals only) are not grounded to the chassis of the car, this can blow up the internal amplifier of the radio and this can result in no sound. If you can measure the voltage of the speaker wires coming out of the radio, they should measure at about 6 to 7 volts. If any one of the 8 speaker wires is not at that level, you have a blown amplifier IC in the radio. They all should measure the same give or take a few millivolts, if not the amp is bad.
Let me know if this help you at all. and a good rating would be appreciated for this free help.
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if it is a 5.1 channel amp wire the center speakers together into the same port. wire the two front speakers in the or der that they would appear on the amp (such as left front speaker to the left front speaker terminal on the amp etc.) and do the same for the rear speakers. and all you should have left is the sub-woofer channel in which you do not have to worry about.
If you only have 2 sets of pre-outs, you will either have to split the fronts into front and rear channels and use the other for a subwoofer signal, or else utilize an equalizer or other preamp that separates out a sub channel. I have an Alpine EQ that I send one stereo pair into, and it sends out front, rear, and sub outs. That allows for front/rear fade, and independent sub level adjustment.
Every stereo has it's intricacies, once you learn the controls then you can adjust the sound. if you have adjusted the balance to equal, then you may have a broken by door swing ground or positive, sometimes the ohms are split by a common positive connection (front and rear) contained with in the circuit of left or right. This crappy circuit could kill 3 of your 4 speakers, but then with the addition of an after market sub, who knows what kind of monkey business has been committed. Start from scratch in stead of chasing down electrical gremlins. Run new wires to all the speakers, dump the sub. Rebuild what should be there in the first place. Verify manufacturers connections and your interpretation of said, in the harness. Verify that the radio or amp can handle a sub without some goofy mono marriage of rear channels to obtain required ohms for crappy walmart sub Bazooka.
On second thought go to best buy, apply for credit card, and tell them that you want to bump down the road.
If you are planning on using the factory stereo you will need a line level converter. You basically connect two of your speaker channels to the line level converter. That in turn will give you a line level out (RCA cables) That line level out can be fed to a two channel amp which would be where your subs would hook up to. If you do this however you will lose two channels of mid range and highs ( your rear speakers ). Downfall to this approach is that some line level converters are susceptible to alternator noise.
If you have an aftermarket deck this will be much more simple. You simply run your RCA outputs from your deck to your external amplifier. Aftermarket decks typically have front rear and subwoofer outputs. That means you can drive a four channel amp for your front and rear and a two channel amp for your subwoofer. This is the recommended way to go. For hookups I just suggest buying an amp kit that is comparable in power rating to your amp. If you buy a 500watt amp make sure your wiring kit can handle at least 500 watts.
This one Wire should be for the +. Try connecting the + to the Head Unit and - to a Common Ground. At the Worst, You will Blow the Amp Fuse if not Correct. The Lead from the Head Unit is Only an Off and On from the Ignition. Please Rate My Response! Thanks!
THIS UNIT HAS NO SUB WOOFER AMP IN IT. THE ONLY WAY TO OVER COME THIS IS TO HOOK THE LEFT AND RIGHT FRONT SPEAKERS STRAIGHT TO THE SUB WOOFER AND THEN GO FROM THE SUB WOOFER BACK TO THE INPUTS ON THE BACK OF THE UNIT FOR THE FRONT SPEAKERS. THE SUB WOOFER THIS WAY WILL EXTRACT THE BASS AND THE FRONT WILL RECEIVE THEIR PART. THIS SOUNDS CRAZY AS HELL I KNOW BUT THAT'S HOW I GOT MINE TO WORK. THE OUTPUT FOR THE SUBWOOFER IS USELESS AND PUT THERE FOR YOU TO HOOK UP AN AMP FOR A SUB WOOFER. EVERYTHING HAS SHORT COMINGS, AND THAT'S THE ONE FOR THE AX-720.
In general, there are two ways to hook up your sub-woofer. First using the high level outputs from your receiver ( speaker output from the front R & L speaker terminals ) run a set of wires from the outputs to the speaker inputs on the sub-woofer, you do this in concert with the speaker wires going to the front R & L speakers which you then attach to the R & L speaker outputs on the sub woofer amp. Note that the sub woofer doesn't power your front speakers, the connections from the sub amp are just a pass through connection where the signal needed by the sub is parasitically taken from the inputs. Second is via a low level output from your receiver / amp to the low level input on your sub amp. This is normally done via a RCA type of patch cable and connected to the sub woofer RCA jack on the rear of the source receiver or amp, Next run the patch cord to the sub amp an into the RCA jack input. IF you have a right and left input, use the Right input.
You can download the installation manual from the link below:
It has the following diagram plus other hookup info...
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