In Reply to: Jbl and. Tannoy posted by guskund@yahoo.com on April 29, 2007 at 17:17:13:
Drivers are linear electric motors. Not all motors have equal efficiency. The load for motors is air. You can think of the cone as the transmission that couples the mechanical energy from the motor (voice coil) to the air. Not all cones are equally efficient at their job of coupling (far from it). Crossovers have varying efficiencies, too. Different enclosure types have different efficiencies, as well. Ported enclosures are more efficient bass radiators, for example, both because they use the back wave off the woofer and because not containing the back wave puts less resistance on the motion of the woofer.Those are some of the reasons for different efficiencies in differenct speaker systems.
Every three dB difference in sensitivity requires doubling or halving the power, so going from a 91 dB efficient speaker to one rated at 87 dB would require more than twice as much power.
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- Re: Jbl and. Tannoy - lipmanl 06:16:43 04/30/07 (0)