Left side crackling noise Blown channel?

Get a meter and check the resistance on the speaker. Looks like a speaker may be blown but with the description of the crackle noise from the slide controls you might have a bad pot in the unit or the pot has come loose from the board. This could explain why the speaker blew out

What exactly do you mean by "middle volume settings"? Where is the volume control physically, where are the channel levels set and what is the crossover point? After the crackling appears , do you switch speakers to the right channel to see if speakers are actually damaged or if the receiver is producing the distortion?

Well, very common with JVC's to loose channels, JVC's tend to burn out or, skip, or their channels die out. Easiest fix is to replace it with a Sony or Pioneer but if not an option then use the rear left channel to run both left front and left rear speakers. Wire the left front + and left rear + to the solid green rear + wire on the car harness adapter and the left negatives to the green w / black rear negative channel wire. This will be a temporary fix but you need to fix or replace the radio otherwise the speakers will draw aheavy load from the rear left channel of the radio and probably overheat or burn out on you with long time hearing or at high volumes.

Good luck.
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swap the wires around to see if the right speaker will give sound on the left channel. If it does, the it's a blown left speaker. If you don't get sound out the right one either, then the left channel ouput has a bad capacitor somewhere in it.

Radio wire colors:
P o w e r Memory (+12v Constant) Yellow Ignition (+12v Switched) Red Ground (-) Black Dimmer Pink/White (Alpine only) Power Antenna Blue Amplifier Turn-on Blue/White Phone Mute Light Blue (Sony only) S p e a k e r s Right Front (+) Gray Right Front (-) Gray/Black Left Front (+) White Left Front (-) White/Black Right Rear (+) Violet Right Rear (-) Violet/Black Left Rear (+) Green Left Rear (-) Green/Black

1991 Oldsmobile Cutlass Supreme Car Stereo Wire Diagram
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: Brown
Car Stereo Antenna Trigger Wire: Pink
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 4′
Car Audio Front Speakers Location: Dash
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: 6′ x 9′
Car Audio Rear Speakers Location: Rear Deck
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue
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easiest way to see if the left outputs have gone is to swap the right and left speakers over. if the left works out of the right channels you know if the set has had it.hope this helps

White - left front
Grey - right front
Green - left rear
Purple - right rear
Yellow - memory power
Blue - remote power (power ant, amp or eq power)

Make sure your speaker wiring does not come close to the 12v power cable running for your amplifier. If your amplifier's 12v power cable runs on the drivers side of the vehicle, run your speaker cables on the passengers side and make sure your tweeters have a high pass filter to stop any pickup of engine sound (When you are driving you *WILL* notice it at high RPM. a HPF (High Pass Filter) will also stop those nasty hissing sounds on S's.

Best thing to do is to put the unit in 5 channel or 7 channel mode. That will send left ch information to the front left and rear left speakers ( both will get the same information). Ditto with the right channel. The center channel will get centre channel information.

If all the speakers work, go out and rent TOP GUN. ( yes its old), BUT there are a few extreme scenes , one of which is the elevator scene, where the camera changes perspective and suddenly you hear the elevator doors close BEHIND you through only the surround speakers ( have the unit in surround mode....NOT 5 or 7 ch mode ). If this works ok, then you have no problems.

Remember, surround sound only produces information in the rear channels when the information is there. To check out the digital and DTS decoders, get an action flick. If you can, get a remote too, because that will unlock many features about the receiver that you cant get to with the front panel controls. Also go to yamaha and download the owners manual ( its free !!).....that should get you going.....

best of luck...
Rob

it is highly likely that you're TV is outputting mono sound, hence the left channel only. check your physical connections to the TV and the balance / channel volume on the television as well.