Jeff Rowland Model 625 S2 Stereo Amplifier

Quick Overview

Jeff Rowland 625 S2 Stereo Power Amplifier

The 625 Series 2 incorporates many of the same technical features of the 725 amplifiers. Similar to the 725, the 625 S2 signal circuitry is built upon a Rogers ceramic circuit board laminate material for lower dielectric absorption and energy storage. The 4-Pole filter capacitors used in the 725 power supply have also been included in the S2, significantly reducing power supply output noise. The maximum output power has been increased from 300 to 325 watts per channel at 8 ohms.

Precision LED based current sources have been implemented throughout the amplifier circuitry, along with 0.1% thin film SMD resistors for more stable operating points and lower noise. Custom designed Lundahl input transformers are implemented with a higher turns ratio and wound with Cardas high purity copper wire.

Input circuitry includes an additional linear phase 2 pole filter to effectively attenuate all out-of-band signals from any source, including DSD spurious noise.Cardas gold/teflon/rhodium XLR input connectors are carried over from the 725. Newly developed error-correction circuitry has been incorporated around the entire amplifier, making a total of three independent error-correction techniques used to decrease all forms of distortion throughout the entire audio bandwidth.

The Model 625 S2 delivers a sensuous grain-free musicality of unparalleled transparency and low level resolution that blossoms from a rich velvety silence and blossoms into the pure enjoyment of your listening experience.

Manufacturer's Website Jeff Rowland



Jeff Rowland 625 S2 Specifications:

Output Power 325 watts @ 8 ohms / 600 watts @ 4 ohms
Frequency Response 10 Hz – 150 kHz, -3 dB
S/N Ratio 95 dB, ref. 1.0 watt @ 8 ohm load
Output Noise < 100 µv, A-wtd
Crosstalk > 91 dB @ 1 kHz, 74 dB @ 20 kHz
Input Impedance 40k ohms
THD + Noise < 0.001% @ 1 kHz, 8 ohms
Damping Factor > 200, 20 Hz - 20 kHz
Overall Gain / Bal. or Unbal. 26 dB
Common Mode Rejection Ratio > 90 dB, 20 Hz – 20 kHz
Absolute Phase Non-inverting Pin 2 Positive
Inputs 1 pair balanced (XLR)
Outputs 2 pair parallel binding posts per channel
Power Consumption Idle 100 watts
Power Consumption Standby < 0.5 watt
Amplifier Weight 54 lbs. / 24.5 kg
Amplifier Shipping Weight 64 lbs. / 29 kg
Amplifier Dimensions (h/w/d) 5.75” x 15.5” x 16.25” / 146mm x 394 mm x 413mm


Please find reviews below:

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Jeff Rowland 625 S2 Power Amp " Hi-Fi News " Magazine Review , January 2016

Complete review Here

JEFF ROWLAND 625 S2 Power Amplifier review by Edgar Kramer " Audio Esoterica " Issue 2, 2015

Complete review Here

Hi Fi + " Magazine Review

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6 Moons " Online Magazine Review

Mono And Stereo " Online Magazine Review

High Fidelity " Online Magazine Review