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At where I work someone might buy a used
stereo receiver, a nice Yamha or Sony, from
ten years ago. They will usually pair it with
speakers of 3-6ohms impedance, even
though on the back the receivers might say 8-12
or even 8-16ohms. Am I right to recommend
they get higher - vs lower - impedance speakers
to go along with those receivers or amps?

I personally do not like the trend of lowering
impedances in consumer speakers, as I
feel the amp needs something to 'push against'
when it is driving the speakers.