Other reviewers, particularly Doug Schroeder, found the mono'ed amps to be noticeably better than a single amp. They have used the Benchmark in mono'ed mode with their hybrid speakers which do have a low treble impedance without any problem however, they did not comment on the compatibility with the CLX. I have spoken to knowledgable personnel at Martin Logan. It also seemed to have a lack of tonal color and density. However, it lack lower midrange to bass dynamics compared to many other amps I have had, Pass Labs 100.5's, Krell 402e, and Coda No. It was as advertised extremely transparent and able to resolve small details. Since starting this thread, I tried out a single Benchmark amp. This long discussion likely has much to do with the difficulty many amps have in optimally driving the CLX. Also the sensitivity of the CLX as estimated by British hifi mags was closer to 85 dB than the 90 dB published by Martin Logan.
#BENCHMARK AHB2 SMPS POWER SUPPLY DRIVER#
I suspect that the impedance in the bass is unusual due to compound bass driver in the CLX. It falls to 3 ohms at 6-7 kHz and then down to 0.7 ohms at 18-20 kHz all capacitive. The impedance in the bass is capacitive and over 30 ohms for the CLX at 50 Hz at the lower end of its range and falls to 4 to 6 ohms in the upper midrange and lower treble. The only impedance curve that I have seen for the CLX's was published by hifi world the impedance for the midrange/treble panel on the Montis published by Stereophile is probably representative of what a more detailed curve would look like to the CLX midrange/treble panel. John Atkinson measured a minimum impedance of 3.3 ohms at 10 kHz and then rising with an inductive load for the 2912's. The obvious exception are the Quad 28 series. I am sure that the Audiostatics are great speakers and like most full range or nearly full range electrostatics they present the driving amp with a capacitive load with high to very high impedances in the bass and low to very low impedance in the mid to high treble region.
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