Question about Kenwood 500W Class D Mono Amplifier with Crossover

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Humming noise..... i have my remote wire hooked up to a toggle switch so sometimes i forget to turn my amp off when i get out of my car and when i do that some times when i shut the door it makes my subs make a loud humming sound. it started to do this when i turned my amp power up over half way. i am running a 4gauge power and ground wire with a capacitor. any ideas whats going on?

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Try to isolate the grounds of the amp and that of your head unit. I mean 'lift' the ground connection. Just connect the hot side and not the ground wire - your amp's grounding and your head unit's grounding might have a voltage loop. smile when the hum dissappears.

Posted on Sep 25, 2008

  • jhun T
    jhun T Sep 25, 2008

    what i meant is the input grounds. The quickest way is to cut the RCA cord and split-off and cut the sheilds of the cable near the amp or near the HU. It is still a 'ground lift'.

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1 Answer

How do install car stereo system


if you are are talking about an amp and subs simply get an amp istalation kit take the big red wire and hook it to your battery with the fuse that should be in the kit,thats going to go into the b+ on the amp take the black wire and find somewere near your amp with a bolt going into the car seat bolts work the best, this is for your ground. the little blue wire goes from the back of the radio at the remote wire to the rem inlet on your amp.i always put mine on a toggle switch so if you dont want it on you can just flip it off.To do this just simply run a 12 power wire into the switch and your remote wire coming out of the switch.Finally hook your spearkers into the amp red is posotive black is negative.thats all there is to an audio system.

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I have an Dual brand 300 watt amplifier that I just bought and I hooked everything up right (battery---power, ground----sanded metal, bypassed remote with toggle switch remote-----+terminal on switch...


Is your toggle hooked to ground? Hook your toggle switch to the battery and then the other end of that toggle the remote input on the amp.

Aug 15, 2010 | Car Audio & Video

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How do the radiator fans work? straight 12 V power in ground out? What damage could be done by wiring one fan directly, with a toggle switch, and hooked to a fuse and then grounded?


it's controled by a fan switch, when it get to a certain temperature the switch closed and power the relay which makes contact to feed power to the fan.
you can do a toggle switch like that, make sure you have right size of wires and the switch can handle the load, and the fuse is the right amp.
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I want to hook up an amp and speakers to my 2008


The remote wire is an accessory power source, like the ACC line from your radio. (usually the red one). Can also be hooked into anything that has 12v when the ignition is on, like a powered antenna.

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My kicker amp zx 300 want turn off when i turn my car off had the remote wiring check dont no what to do


Hello pruittdarryl,

Does the amp turn off when you remove the remote wire? If it does, then wire a toggle switch into the remote wire and just use it to turn the amp on and off. If the amp does not turn off with the remote wire removed, there is probably a short between the 12V+ and remote terminals. In that case, the amp is probably defective. If it is OK otherwise, you could still use it by putting a heavy duty toggle switch into the power wire itself.

Hope this helps.

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My amp is not working! i have a live from battery and a good earth,but still nothing,does it need to be earthed to back of head unit?


Do you have the remote turn-on lead hooked up?

There should be 3 wires on the power side of the amplifier.

Ground - to the car chassis
Power - to the car battery
Remote - to the remote turn on lead from the head unit. (this emits a 12V signal to a relay inside the amplifier for it to turn on when the radio does)

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Sep 05, 2009 | Car Audio & Video

1 Answer

Have and amp hooked it up and nothing works didnt hook up a remote could this be the reason i am getting nothing


DID YOU HOOK UP THE REMOTE WIRE ON THE AMP SIDE? RUN A WIRE FROM THE REMOTE TERMINAL TO A POSSITIVE WIRE THAT IS ONLY HOT WITH KEY ON, THAT SHOULD WORK, OR YOU COULD RUN WIRE TO ALL TIME HOT WITH TOGGLE SWITCH IN IT, BUT BE SURE TO SHUT OFF OR BATTERY WILL BE DRAINED.

Sep 04, 2009 | Kenwood KDC-MP228 CD Player

1 Answer

Bass speaker start up noise


Hello anne845,

It sounds like the installer wired the amp remote turn-on terminal to an "accessory" lead in your vehicle. Many stock radios do not have a dedicated amp turn-or lead and the alternative is to connect the amp to a switched power source (ignition or accessory). This means the amp turns on whenever you turn on the vehicle ignition, often resulting in a thumping from the subs. It is a perfectly satisfactory alternative, and will not damage either the amp or the sub. But it's irritating.

If the thumping is objectionable, have your installer wire a SPST (Single Pole, Single Throw) toggle switch inline with the turn-on wire. The switch should be mounted so it is accessible by the driver, and whenever you turn on the radio, turn on the toggle switch.

Hope this helps.

May 11, 2009 | Alpine SPX-17MB 300 Watts MIDBASS Speaker...

1 Answer

Power off issue


Hello octoberburni,

No it is not normal for the amp to stay on when you turn the ignition off. And yes, it will definitely drain your battery if this condition is not corrected.

Use a multimeter set to volts and check between the ground connection (right connector) and remote turn-on connection (center connector) on the amp itself. You should have approximately 12V when the ignition and your head unit is on. And 0V when they are off. If you measure voltage when the ignition and head unit are off, either the incorrect wire is connected to the remote terminal, or the defect is in your head unit. If you measure OK, that is voltage present when ignition and head unit are on, and no voltage when they are off, then the problem is most likely in the amp itself. If you find voltage on the remote wire all the time, check to see that it is coming from the correct output from the head unit. Most aftermarket head units use a blue or a blue/white wire for the remote amp turn-on lead. Many (most) stock OEM receivers do not have a remote amp turn-on lead. But they may have a power antenna lead which will serve the same purpose. In any case, just insure that the correct wire is connected to the amp. It should have voltage when the head unit is on and no voltage when the head unit is off.

In either case, if everything else is still working with the amp, you can simply wire in a manual toggle switch to turn the amp off or on whenever you desire. A SPST (single pole-single throw) toggle switch is what you need. If the problem is in the head unit wire, put the toggle switch inline with the remote wire and mount it somewhere handy on or near the dash. If the problem is not in the remote wire, you'll need to put the toggle inline with the main power wire, the one marked "12V" (left connector) on the amp. In this case, you need to make sure that you have a heavy duty toggle switch, one that will handle more amps than your primary fuse. You may need to look under the hood for the fuse to check it's value.

Hope this helps.

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1 Answer

Cd player


The yellow wire goes to + (hot) 12 volt constant, red wire goes to ignition switch, Hook up your amp together with the red wire
(switched) and the amp will come on with the ignition switch.
Blue and white wire is for the power antenna.
Leadispenser

May 28, 2008 | Kenwood KDC-2011S CD Player

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