I would have to agree with Lance on this one,all those Ess speakers were much better to my ears also during the day.I know several people that still have them going in my area even after all these yrs.
@yogiboy is correct. Bose made the 601's. I owned a pair from 1978 until 1998.
First generation 601's were great speakers IMHO much better than the 501's.
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