My BOTH rear speakers are very distorted and garbled. This is a Bose system in a Cadillac Touring Coupe. If I adjust the balance the rest of the system works perfect.

2000 Cadillac Escalade Stereo Wiring
Constant 12V+ Orange
Switched 12V+ Yellow
Ground Black
Illumination Gray
Dimmer Brown
Antenna Right Front
Front Speakers 6 1/2" Doors
Left Front (+) Tan
Left Front (-) Gray
Right Front (+) Light Green
Right Front (-) Dark Green
Rear Speakers 6 1/2" Rear Doors
Left Rear (+) Brown
Left Rear (-) Yellow
Right Rear (+) Dark Blue
Right Rear (-) Light Blue

sounds like a circuit or fuse has blown out.

Depends on which sound system you have - BOSE systems in Devilles have two left front speakers!
If it's an amp problem, you will have an error code (DTC) set which you can see with a code scanner.
Check to see if the L/R balance control is working properly - cycle it a few times to make sure there are no dead spots.
If it's the door speaker, it is probably water damaged or it has open coil wiring and will need replacing.

Nissan's 2008 Altima was offered in several trim levels, ranging from the base 2.5-liter four-cylinder model to the sportier 3.5-liter V-6 Coupe. While the high-end trim levels were equipped with a premium Bose-developed nine-speaker sound system, lower-end Altima models were fitted with a standard six-speaker system mated to a single-disc CD player.-------------------------------------------------------------------------------
Digiprog 3

how to input conection

The front speakers are the base against which you adjust everything else.

Adjust the front rear balance for 0dB.

Readjust the rest of the speakers using the test tones. Normal audio may not have a lot going on back there.

check wiring.speakers can be checked with a 9 volt battery one on each lead it will move if the are operating correctly. check also for wiring/radio shorts.

1992 Cadillac Eldorado Car Radio Wiring Schematic
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: 5 1/4′
Car Audio Front Speakers Location: Doors
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

The amps are on each of the speakers. There is a place in Florida that will fix them for around $85.00 each plus shipping. I put a sony unit in mine and replaced all of the speakers with the kicker ds series for less than fixing the bose system.

As far as replacing the dvd any dvd player will work, as far as your LCR speakers go ( left, center, right ) it would be best to replace them with the same ones that came with the whole system, at least you want them to be same in size, power, and manufacture relative to the 2 rear speakers, at the very least the replacements should be same in size and power relative to the originals even if not from same manufacturer so as to attain relative level balance with the rear speakers, at the very very least any LCR replacement speakers will do really. The main point is keeping the relative balance between the LCR and rear speakers, the sub can be adjusted on its own. Sorry to hear about your theft by the way, that sucks.