Plateau Camber 3.5 loudspeaker RH's 1990 System

Sidebar 3: RH's 1990 System

The reference system used to audition the four loudspeakers reviewed here includes the VTL 225W Deluxe monoblock and Krell KSA 200 amplifiers, driven by a Theta DSPro Basic digital processor through the passive Electronic Visionary Systems Stepped Attenuator. The analog front end was a Well-Tempered Turntable and tonearm fitted with a Sumiko Boron vdH cartridge. Phono preamplification was provided by the Precision Audio outboard phono module, connected to the passive attenuator. The phono preamp has enough gain for the moving-coil Sumiko and is able to drive the amplifiers through 20' of interconnects.

A 1m pair of AudioQuest Lapis connected the Theta to the EVS Stepped Attenuator, and the power amplifiers were connected by a 20' pair of Lapis. Cable between the Well-Tempered/phono preamp/Stepped attenuator was provided by Music Metre interconnect. Speaker cable was 3' runs of bi-wired AudioQuest Clear Hyperlitz or 10" runs of bi-wired AudioQuest Green Hyperlitz. The VTLs' monoblock construction enabled the use of the shorter cable, while the Krell required the 10' speaker-cable runs. The Phantom Acoustics Shadow, an active low-frequency room-control system, was turned off during the auditioning.—Robert Harley