Jeff Rowland Design 625 S2 Stereo Power Amplifier - PREOWNED

Description

Preowned Jeff Rowland 625S2 Stereo Power Amp - Purchased new in 2015

Two small scuffs on the front panel

MY TAKE: Striking beauty, stunning sound, rock-solid reliability - a complete package. Few products offer the complete satisfaction and pride of ownership you’ll experience with the purchase of a Jeff Rowland component. – Galen Carol

Features a unique composite circuit architecture incorporating separate Class AB voltage and current gain blocks with no overall negative feedback.

Precision machined from a single block of non-resonant aircraft-grade aluminum, the Model 625 S2 features a unique composite circuit architecture incorporating separate Class AB voltage and current gain blocks with no overall negative feedback and virtually free of internal and external EMI field contamination and mechanical vibration.

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.

Watch the video showing the amazing process of machining Jeff Rowland chassis and front panels.
 

FEATURES:

• Machined Aluminum Chassis - Precision-machined chassis with integrated heat-sinks, milled from a solid block of aircraft-grade aluminum, provides exceptional thermal heat transfer/dissipation, RFI/EMI shielding, and resonance control.
• Composite Circuit Architecture - Unique composite circuit architecture incorporating separate Class AB voltage and current gain blocks with no overall negative feedback, delivers a sensuous grain-free musicality of unparalleled transparency and low-level resolution.
• Balanced Topology - Inherent cancellation effects of balanced topology implemented throughout all power and input/output circuits ensures greatly reduced distortion and noise under dynamic signal conditions.
• High-Current Copper Bus-bars - High-current, dual polarity, ultra-low impedance copper bus-bars distribute both power supply input current and signal output current, virtually eliminating intra-circuit EMI signal contamination, greatly reducing internal wiring, while increasing circuit board rigidity.
• High-Precision Surface Mount Components - Extensive use of Lead (Pb)-free, low-temperature coefficient, active and passive surface-mount components results in significantly smaller loop areas, reduced circuit capacitance and inductance, and introduces less noise than conventional leaded components.
• Transformer-Coupling and Isolation - Transformer coupled input circuitry provides universal component compatibility and virtually eliminate ground loop noise and RFI/EMI. Transformer coupling ensures identical amplifier overall gain when using unbalanced input adapters.
• Power Factor Correction - Power Factor Correction (PFC) in the power supply reduces AC line harmonic noise pollution and increases AC line power utilization to 99%.
• High-Efficiency Switch-Mode Power Supply - Highly efficient, compact, light weight, 1500 watt DC switch-mode power supply provides optimum voltage regulation for all circuits and operating conditions, and allows for quiet operation over a wide range of AC mains power sources.
• Dual-Position Speaker Terminals - Dual CE approved speaker output terminals, in both horizontal and vertical orientation, require no tools for secure, low resistance connections, and allow for easy bi-wiring applications.
• 20 amp AC Power - 20 amp AC power inlet accepts a wide variety of aftermarket high-performance power cables.
• Front Panel Standby Button – Illuminated front-panel push-button switches the amplifier into standby mode (<1 watt consumption).
• Rear Panel Remote Jack - 12V 3.5mm jack on the rear panel permits amplifier power on/standby switching in remote and home theater applications.
• Leveling Supports - Removable 3-point self-leveling Delron chassis supports provide high

REVIEWS:

“In a world where every review seems to be good and so many products exhibit so few specific, identifiable sonic flaws, these Rowlands represent a different level of achievement. It’s that attention to detail, that perfectionist insistence on the right over the easy, that has created them – and recreated the musical performances they’ve played to such emphatic effect.
“If you are feeling jaded and you are losing confidence in the promise and performance of high-end audio, the JRDG Corus/625 combination is just the antidote you need. Exquisitely constructed components with their feet planted firmly on the path to musical gratification – they’ll plant yours there too.” – Roy Gregory, Hi-Fi+

SPECIFICATIONS:
 

• Output Power: 325 watts @ 8 ohms / 600 watts @ 4 ohms
• Frequency Response: 5 Hz – 350 kHz
• 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: 1 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