My understanding was that the T121 is a less expensive alternative to the U1...... not the P22. But whatever the case, I like the U1's. We also use P22's in voice and instrumental practice rooms, and they do that job very well. Our dealer recently started replacing about half of our leased U1's with T121's. I don't think we will be buying any of them. later, Dennis Johnson St. Olaf College >
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