Question about Kenwood KAC-728S Car Audio Amplifier

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My amp powers on but no sound output..

Hello, My amp powers on yes the LED does light up but there is no sound coming out what so ever no matter what I do with the gain control, switchs etc. I took the amp completly apart and found no signs of burnage or smell anywhere. Now, you say in another post that it is going to be in the preamp stage. Do you have any diagrams in regards to this area and how to fix it?

Posted by Jason Bliss on

  • Phoenix0327 May 19, 2008

    same problem amp power on but i think the failure is in the positive and negitive connections to the speakers. No matter how i connect them no sound but amp is on and fuses are good

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My Clarion is doing the exact same thing...and im starting to lean towards a failure in the powersupply of the unit...it just cant produce the sound.

Posted on Mar 25, 2007

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How do i fix blaupunkt car amp red led lighting up as i give power to it .sometimes if i let the amp on it starts by it self .when the green led goes on the amp works till i shut it down no matter wha
Sounds like you have a power problem. I suggest you take it in to have it repaired.

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Hello! Yes, It certainly looks like the output power circuit has blown.

I wish I had better news.

Guru................saailer

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

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I have a Boss OL5KD Class D Monoblock Amplifier and I set it up but is no sound coming up from the speakers, can anyone tell me how to higher the volumen? where is located the volumen??I need to higher the...
Hello maydude01,

The Boss OL5KD does not have a volume control. It has an "Input Level" adjustment which is used to match the output from your head unit preamp output to the amp. It is the first rotary control just to the right of the input jacks.

If you have no sound at all, I'd suspect that something is incorrectly connected or there is no input to the amp. First make sure that the amp power light (green LED) is coming on when you turn on the receiver and that the protection light (red LED) stays off. Then check all of your wiring, especially the RCA output cables.

Initially set the controls like this: MASTER/SLAVE switch in MASTER position (left). INPUT SENSITIVITY 2v-8v (right). INPUT LEVEL, SUBSONIC FILTER, BASS BOOST, and LOW PASS FILTER; midrange. PHASE SHIFT "0" (left). Leave the remote level control disconnected.

After you've checked all wiring and initially set the switches and controls, turn the receiver on to about 3/4 volume. Now adjust the INPUT LEVEL to the left just until you begin to hear distortion, then turn it back right just a little. Adjust the other controls for best sound. Plug in the remote level control and make sure that it adjusts the bass up and down. You're finished!

If there's still no output from the unit after checking all of the wiring, either the unit is defective, it's not getting an input from the receiver, or the sub(s) are defective.

Hope this helps.

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Hello thanks the model # is FP5251 G105
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My amp is on but the protection light stay's on!!
Disconnect all speaker wires from the speaker terminals of the amp and disconnect signal cables from the amp. If it powers up, the wiring needs to be checked. If the protect light remains on, the amp likely has blown output transistors.

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1 Answer

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Ok This is a two channel High Current amp. It is stable to one ohm. If the Subs are single voice coil at two ohms the they have to be wired in Parallel that means (Red +) (Black -) are connected to the + and - of another sub and then the (RED +) (Black -) from both go to one output channel of the amp. You pair the other two in the same fashion on the other output channel. If you are getting no output (sound) at all first check if the amplifier is going into protect. (Usually indicated by a red led on the unit. If it is connect only one Sub to each output and see if the protect LED goes out. If it does then you should have sound at the subs. If not check that you have the sub output enabled on the HU some head units do not come with the sub output enabled on the HU. If every thig is enabled, with only one sub connected to each output and the protect LED is not on then your amp is probably blown and needs repair. Nice thing is that MA has a great warrenty policy. Check and make sure the protect LED is off. If it is on you probably have the SUBS wired wrong

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