I looked for the speaker in my basement, but it may be in the garage. I'll check tonight after work (we had a deluge of rain here yesterday, so I wimped out from my garage trip).

Here is a pic of the Zuma installed, with a glimpse of the passenger kick panel speaker. The faceplace modification could've been better.

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This is the 6x9 setup in the back.

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Not actually stock and I may have done it differently or more discretely than the previous owners did. Luckily, the hat shelf needs to be replaced when I redo the interior, so I'm going to try to find another of those low profile 6x9 covers you see in the middle of the hat shelf. That's where the original speaker was, and yes, that's an original Volvo speaker cover!! Though I would have to build some sort of 6x9 "tube" (out of MDF) to set the new speakers below the deck in order to use those covers.

The Retrosound Zuma is a nice unit. Plenty of power with great installation options and expandable features (CD changer, Aux input for MP3 or satellite, etc.), but the knob stalks are a bit delicate. I've had to replace one already, and I think another was failing as I put the car away for the winter. They usually send me another one free with an exchange.