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RE: Quad ESL 63 impedance curve: not as bad as we thought?

From JA's review of the 2805:

"The ESL-2805 is specified as an 8 ohm design; its impedance dropped to 4 ohms in the high treble (fig.1, solid trace), but otherwise remained relatively high, with a moderately low phase angle. There is a sharply defined impedance peak at 20kHz, below which is a combination of 5.2 ohms and -45° electrical phase angle, which might upset amplifiers not comfortable driving less than 8 ohms ."

The speakers are not a difficult load to drive. An amp that can't handle the load should be set at the curb. The original Quad was a more difficult load for an amp to deal with but something that should not upset a properly designed amp. A NAD 7020 receiver can handle a stacked pair of originals with no problems.

The resonance, phase angle shift above 20kHz my cause some poorly designed amps to oscillate. Probably more of an issue when using vinyl, poorly aligned cartridge, mistracking, etc.


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