Jeff Rowland
Model 725
Mono Power Amplifier
(2 Pieces)
(Made In USA)

Overview 

Precision machined from two single blocks of non-resonant aircraft aluminum, the Model 725 features a unique composite circuit architecture incorporating separate Class AB voltage and current gain blocks with no overall negative feedback. The Model 725 features mil-spec ceramic circuit boards, high current copper bus bars, a power supply incorporating 4-pole capacitors and power factor correction, combined to deliver a life-like grain-free musicality of breathtaking transparency.

 

Features 

MACHINED ALUMINUM CHASSIS

• Precision-machined chassis with integrated heatsinks, milled from a solid block of aircraft grade 6061-T6 aluminum, provides exceptional thermal heat transfer/dissipation, RFI/EMI shielding, and resonance control.

CERAMIC CIRCUIT BOARDS

• All audio circuits are implemented on mil-spec, multi-layer, low dielectric constant, Rogers™ ultra-rigid ceramic circuit board substrate for extremely low energy retention and absorption. Large low impedance ground plane areas for extended internal star-grounding.

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.

PARALLEL BINDING POSTS

•    Dual CE approved speaker output terminals require no tools for secure, low resistance connections, and allow for easy bi-wiring applications.

FLEXIBLE 20 AMP AC POWER

• 20 amp AC power inlet accepts a wide variety of after-market 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 rear panel permits amplifier power on/standby switching in remote and home theater applications.

SELF-LEVELING SUPPORTS

• Removable 3-point self-leveling Delron chassis supports provide high frequency  mechanical noise isolation.

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