Mozart fan
I think reducing an evaluation down to one aspect - efficiency- of the many issues to consider is not the idea. Its like saying you'll only consider a car that gets over X miles per gallon as a proper car. What if you want a sports car? Or if you want a truck to haul things? Different motors, different efficiencies. Efficiency is NOT the only thing that matters in engines or drivers.
From product management experience at JBL and with ATC, a driver can be optimized for bandwidth OR efficiency. If you want more low end from a driver, it WILL be less efficient. IF you are willing to forgo some low end, you can go for efficiency.
I know for example ATC SCM19/20 systems average 87dB SPL 1w/1m. In its sealed box, that 7 inch SL driver has response down to 30-40 hz. Why give up this low end for a higher efficiency when amp power is so affordable these days? Its not like the old horn days, where a 70W amp was about as large as they get (at least in tube power amps).
Brad
I think reducing an evaluation down to one aspect - efficiency- of the many issues to consider is not the idea. Its like saying you'll only consider a car that gets over X miles per gallon as a proper car. What if you want a sports car? Or if you want a truck to haul things? Different motors, different efficiencies. Efficiency is NOT the only thing that matters in engines or drivers.
From product management experience at JBL and with ATC, a driver can be optimized for bandwidth OR efficiency. If you want more low end from a driver, it WILL be less efficient. IF you are willing to forgo some low end, you can go for efficiency.
I know for example ATC SCM19/20 systems average 87dB SPL 1w/1m. In its sealed box, that 7 inch SL driver has response down to 30-40 hz. Why give up this low end for a higher efficiency when amp power is so affordable these days? Its not like the old horn days, where a 70W amp was about as large as they get (at least in tube power amps).
Brad