These are suitable for voice transmission, but I would prefer something better if you want to play music or movies through your speaker system. At first I used the strongest taps but they were too loud and distorted. There was a lot of resonance, the piano keys rang like bells. It almost sounded like I was listening to music on standby. But for talking and paging, they're cheap and get the job done. For music, we went with the JBL Control 65 P/T speakers, which look nicer, sound a lot louder and less distorted even with a 70V amp, and of course, cost nearly $400 a pair.
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