Jim Clements writes: The Alpha PS1s are PSB's first powered speakers, and are bookshelf in size. Driven by built-in Class D amplifiers, they feature 3.5" metalized polypropylene main drivers and 0.75" aluminum dome tweeters in elegant ported enclosures. These speakers are the latest member of PSB's Alpha line which has been very popular and well received by the audio press and consumers alike
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