The factory default radio in '99 Boxsters is a Blaupunkt radio, though it doesn't have the brand name displayed on it. Yours might be OEM. Many complain about the sound stage of the OEM speakers.
I have a '99 as well, and once I put an OEM rear speaker kit into the storage cubby behind the seats (above the engine cover) the overall sound stage improved considerably. Though the rear speakers are quite wimpy tweeters, having enveloping sound rather than front-heavy sound makes a big difference.
At the very least, I recommend searching for an OEM or aftermarket rear speaker kit. The better, more expensive step would be to replace the OEM speakers, head unit, and amp.
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