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The Jeff Rowland Coherence II Series 2 is a three-piece solid-state preamplifier featuring transformer-balanced inputs and outputs on XLR connectors. Released as an upgrade in April 1997, the Series 2 improved the attenuator amplifier circuitry using modern surface mount technology, resulting in wider bandwidth, faster setting time, reduced dielectric absorption, and greater thermal stability. It uses a dual high-current transimpedance output amplifier on a copper lead frame, enhancing clarity and resolution during complex music passages. The preamplifier is powered by an AC-assisted, microprocessor-controlled rechargeable battery power supply with two 12V, 7.2 amp/hour maintenance-free lead-acid batteries, providing up to 5-8 years of battery life. It offers 63.5 dB volume control range in 0.5 dB steps, preset gain range of 0-20 dB, frequency response from 0.5 Hz to 160 kHz (-3 dB), channel separation over 110 dB, and switchable input impedance between 18k and 600 ohms. The unit is housed in solid billet 6061 T-6 aluminum chassis, weighing approximately 83 lbs combined with power supply. The Coherence II Series 2 is highly regarded for its smooth, fluid, and relaxed sound with sonorous bass, wide and deep soundstage, and ultra-fine low-level detail, often compared favorably to high-end tube preamplifiers. It includes remote control functionality and a separate remote display unit with low-noise LED indicators. The preamplifier dimensions are approximately 17.5" W x 3.7" H x 10" D including power supply. The original The product is no longer manufactured but remains highly sought after by audiophiles.
Analog signal output specifications
Input and output connections
Size, weight, and appearance
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The closest alternatives on specs, description and the systems they turn up in, with the specs they share set side by side.
The Symmetrical's signal-to-noise is 95 dB against the Coherence II Series 2's 96 dB, its input impedance 47Ω against 18Ω, its class Tube against Solid_state, and its weight 17 kg (37 lbs) against 37.65 kg (83 lbs).
The REX's signal-to-noise is 100 dB against the Coherence II Series 2's 96 dB, its input impedance 100Ω against 18Ω, its class Tube against Solid_state, and its weight 18.14 kg (40 lbs) against 37.65 kg (83 lbs).
The Harmony's signal-to-noise is 102 dB against the Coherence II Series 2's 96 dB, its input impedance 1000Ω against 18Ω, its class A against Solid_state, and its weight 20.41 kg (45 lbs) against 37.65 kg (83 lbs).
The Magnetic's signal-to-noise is 100 dB against the Coherence II Series 2's 96 dB, its input impedance 20000Ω against 18Ω, its class A against Solid_state, and its weight 22 kg (49 lbs) against 37.65 kg (83 lbs).
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