Hi, if you have one of the older BeoMasters, I would suggest BeoVox Penta or BeoLab Penta Mk1, since the absence of Powerlink outputs means you won't have any use of the display in the Pentas, and you won't be able to daisy chain the speaker (Powerlink) signals.
The Pentas have 92 dB efficiency, so you can use them with a lot of amplifiers, but of course if you want to be able to adjust the bass response and sensitivity, the BeoLab version would be a better alternative.
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