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In Reply to: Matching amps to speaker efficiency posted by M3 lover on October 7, 2020 at 09:43:57:
Particularly in the bass. Highly sensitive speakers can still require LOTS of current from the amp, even if they don't need much voltage to put out high SPLs.
First-order crossovers, with the minimum possible number of reactive components in series with the drivers, are often anything but "simple," as they may require multiple components in parallel with the drivers to whip their responses and impedances into a shape where the series filters will actually work as intended. These parallel circuit elements may drop the impedance of each driver/filter section to a point where only high-current amplification will be suitable.
First-order "quadrature" filters (both drivers -3dB with 45 degree phase shift at crossover), combined with physical time-alignment of the drivers, used to be the only way to obtain a perfect step response and non-horrible square wave on the (very narrow) design axis. Multi-amped systems with DSP active crossovers have largely rendered this approach irrelevant, as they allow perfect time/phase alignment in combination with steeper filter slopes. Pat McGinty of Meadowlark used to be a champion of first-order passive crossovers, and is now a big cheerleader for DSP.
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- Must also consider (low) impedances and (severe) phase angle - Brian H P 10/7/2012:45:01 10/7/20 (0)
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