Jeff Rowland Concentra II

Stereo Integrated Amplifier with Phonostage

The Concentra II is a blend of control and power. The Concentra IIs power supply borrows design and technology from the Model 112 Stereo Amplifier, raising power output to 150 watts per channel to create more authoritative and effortless rhythm and timing while still maintaining the natural musical presentation.

Artistry, grace, and function remain the basic tenets of the exterior form. The timeless design of the Concentra II incorporates features to soothe the senses; the placid blue display, the gentle fluidity of the volume control, and the smooth curves of the non-resonant chassis combine to form an engaging whole that stimulates the visual and tactile senses as much as the aural; yet the sculpted exterior is still adept at performing the essential functions demanded of it by high performance: heat dissipation, resonance control, and isolation.

From the quiet opening notes of a jazz ballad through the power of a choral crescendo to the dynamics and punch of live blues, the Concentra II maintains the place established by its predecessor in the growing crowd of integrated amplifiers.

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Dimensions (W x H x D / mm): 445 x 146 x 362
Weight: 23 Kg
Output: 150W + 150W (8 ohm), 250W + 250W (4 ohm)
BANDWIDTH: 0.1 Hz to 160 kHz, -3 dB
SLEW RATE: 30 volts per microsecond
THD AND NOISE: less than 0.01% at rated power
DAMPING FACTOR:> 60, 20 Hz to 20 kHz
GAIN STRUCTURE:
14 dB Preamplifier section
26 dB Amplifier section
VOLUME CONTROL RANGE: 99.5 dB
VOLUME CONTROL RESOLUTION: 0.5 dB + / - 0.05 dB over entire range
Input impedance: 36 kohms Balanced or Unbalanced
COMMON MODE REJECTION RATIO: greater than 60 dB, 20 Hz to 20 kHz
Power consumption: 150 watts idle; 550 watts maximum
Input:
Balanced 3 x XLR per channel
Unbalanced 3 x RCA per channel
Output:
1 pair 5-way binding posts per channel
1 pair balanced pre-out via XLR
1 pair unbalanced pre-out via RCA