Jeff Rowland Design Group Coherence preamplifier & Cadence phono stage Specifications
Coherence: Three-piece-piece solid-state, transformer-balanced, line-level remote-control preamplifier. Inputs and outputs on XLR connectors (pin 3 wired as noninverting). Volume Control range: 63.5dB in 0.5dB steps. Preset Gain Range: 0-20dB. Frequency response: 0.5Hz-160kHz, -3dB. Channel separation; >110dB, 20Hz-20kHz. Input impedance: switchable between 18k and 600 ohms. Maximum input level: 13V RMS (0dB gain). Output noise level: 12µV, 20Hz-20kHz (0dB gain). S/N Ratio; >96dB. Power supply: AC-assisted, microprocessor-based rechargeable battery power supply, using two 12V, 7.2 amp/hour, maintenance-free, lead-acid batteries. Battery service life: 5-8 years. Power consumption: 40W max, 10W nominal.
Dimensions: 17.5" W by 3.7" H by 10" D (with power supply). Combined weight: 83 lbs.
Serial numbers of units reviewed: C0080 (Coherence), D0080 (power supply), auditioning; C0585 (Coherence), D0585 (power supply), measuring.
Price: $14,500 with power supply.
Cadence: balanced moving-coil phono stage with internal step-up transformers and four levels of selectable cartridge loading/amplifier gain. Frequency response: 0.5Hz-180kHz (RIAA accuracy guaranteed to within 0.1dB, 20Hz-20kHz).
Dimensions: 17.5" W by 3.7" H by 5" D. Weight: 35 lbs.
Serial number of unit reviewed: P0048, auditioning; P0216, measuring.
Price: $3300. Optional standalone battery power supply, $3400; optional standalone AC supply (if Coherence not used), $950.
Approximate number of dealers: 35.
Manufacturer: Jeff Rowland Design Group, P.O. Box 7231, Colorado Springs, CO 80933. Tel: (719) 473-1181. Fax: (719) 633-4158. Website: www.jeffrowland.com.