Question about Koiiler XM-8787C Car Audio Amplifier

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Hi... When I adjust my radios balance to full right or full left, it gives far stronger bass then it would if the balance were dead center.... When it is centered, there is very little bass......and music sounds crappy... I have the koiiler xm-8787 1000w 2ch amp... Music sounds nice and clear with strong bass when i switch the balance to full either side.

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Mine is doing the same thing one hits harder than the other any known causes send an e-mail dirtydog98006@aol.com

Posted on Jan 22, 2011

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Speakers are "out of phase", meaning that one side is wired correctly and the other side is not. the easiest way to fix this is to just switch the wires on one side, by "switching" the wires i mean the positive and negative wires on the speakers/box? hope this helps, dave

Posted on Oct 11, 2010

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1 Answer

How to adjust balance control on Marantz sr66 receiver?


As you rotate the control, you should feel a "notch" at dead center where left and right speakers are balanced. If channels are not balanced, you will have to rotate the control either left or right of center.

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Apr 22, 2017 | Cars & Trucks

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Hi there I have an RAB030F clarion stereo in the car i just bought and no one can figure out how to change the time...any suggestions?


Setting the Clock
:$To turn the Power off, Press the POWER button ,) press and hold the BAND button a,wh ile
again. pressing the Function button 1 a to enter
2) Use the Up and Down buttons to adjust the clock display mode.
the volume. 2) Press and hold the BAND button m, while
A : Increases the volume. pressing the Function button 1 for 2 sec-
V: Decreases the volume. onds or more. This enables clock editing.
,#A Ci'4UTlOM
Audio Mode Adjustments
Press and hold the BAND button m, while
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the adjustment mode. The mode switches as
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When this unit is turned on, starting and stop- pressinq the Function button 1 at the same
pressed:
BASSrrREB + BAUFAD -B Previous mode
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buttons a, to adjust the bass and treble.
-=Adjusting the bass>
bb : Bass gets stronger.
4: Bass gets weaker.
-=Adjusting the treble:,
A: Treble gets stronger.
V : Treble gets weaker.
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buttons a, to adjust the balance and
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1 Answer

How to adjust the dead key in a uniden pc78ltw


You change the dead key with the addition of 2 components to the board. There is no dial or pot inside to turn to adjust the dead key.

What you want to do to the radio is called a swing mod. If you are trying to adjust your dead key, it sounds like you are trying to run a linear amplifier. If that is the case, you should probably set your dead key to around 2 watts. Most amplifiers are good with 2 watts. If this is so, then do this:

Go to radio shack and get a 1/2 watt 100 ohm resistor, and a 100uf 35 volt electrolytic capacitor.

Open the radio and look for JV117. It is a jumper. It is located in the back left of the radio in front of the final resistor in front of the heat sink.

Use a de-soldering wick to remove the solder from the trace side of the board. Remove the jumper.

In the jumpers place put the capacitor. Make sure the black tab is facing the back of the radio, towards the final. This is very important because there is a positive and negative to the capacitor. If you do it backwards you can blow your radio.

Solder in the capacitor, then take the resistor and on the side you soldered, solder the resistor bridging the 2 pins of the cap on the trace side of the board.

How this works:

The resistor determines the amount of dead key. the bigger the resistor, the smaller the dead key, the smaller the resistor, the higher the dead key. (dead key will only go as high as it was before you put in the mod.) A 100 ohm resistor gives you about a 2 watt dead key.

ALSO! you are going to want to find VR4. Its a little pot towards the back right center of the board. Then turn it all the way to the left. This turns up your modulation, and will make the radio swing to full PEP wattage, around 20 watts.

If you have a watt meter that reads avg wattage then you can gain more wattage by adjusting L14. It is just right of VJ117. it is a white or brown plastic tank with a copper coil around it with a slug in the center covered by a little way.

*do this only if you have a meter, also, do not transmit on your radio without an antenna connected or a dummy load or you will blow the final.*

Remove the wax and then while saying a steady ahhhhh sound, slowly back out the slug until you have peak wattage,(when the needle no longer increases.) You do not want to back the slug out any more then is needed for full wattage, other wise you over bias the final and lessen the life of it. So once the needle stops going up while giving a steady ahhhh into the mic, back it in a hair just to make sure its not over biased.

And as always, if you are not comfortable doing this your self, take it to a radio tech at a radio shop. They are usually found at truck stops.

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1 Answer

Sony radio cdxgt210


Use the main control knob. The one that turns your volume up and down. If you press it in it should go through bass, treble, fade, balance, and sub. Then use that same knob to adjust it by turning it left or right.

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1 Answer

How the heck do I adjust the radio sounds (Bass/Treble)??


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1 Answer

How to adjust treble and bass


At the lower left of the unit, just right of the power button is a button marked LD, with A-M below that. Push this button and the display will say BATT, then, in a couple seconds it will display 2 numbers. The left number is the bass and can be adjusted with the select arrows (left & right arrows). The right number is the treble and can be adjusted with the volume arrows (up & down arrows). If you push the LD button once more, it will display BAL, then 2 numbers. The left is the left-right balance & the right is the front-back balance. They can be adjusted in the same way with the arrow keys. Hope this helps someone.

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1 Answer

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