I had posted my thoughts in your other thread.
I replaced the front speakers in my '99 a few weeks ago. They were original...and entirely shot. I still had sound from them but I got a lot of buzzing. I'm sure my rear speakers are just as shot.
I would say its plausible you're speakers are dead, especially if they are original. You could also have wiring issues. I wouldn't think its the radio itself. I would say speakers or wiring.
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The Baby: Darla, 102k, '99 New Beetle GL 5-speed. Bone stock. Acquired 4/6/05. Gave her life for me 8/17/11. RIP 
The Project: Klaus, 180k+, '84 Jetta GL Turbo Diesel. Rebuilt and bringing 50+ mpg. Slightly improved from stock  Acquired 7/12/08
The Baby Brother: Günther, 20th Anniversary Edition GTI 
The money saver: 2001 Jetta TDI GL. 114k. Dead auto, swapped to 3 pedals. Hubby's DD and our trip car
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