Model 725 Mono Amplifier

Technology

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.
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 planes areas for extended internal star-grounding.
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.
PARALLEL BINDING POSTS: 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.
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).
REMOTE ON/OFF: A 1/8” (3.5mm) mini plug connector 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.

Specifications

Output Power	330 watts @ 8 ohms / 650 watts @ 4 ohms
Frequency Response	5 Hz – 350 kHz, -3 dB
S/N Ratio	95 dB, ref. 1.0 watt @ 8 ohm load
Output Noise	< 55 µv, 20 Hz – 20 kHz, unweighted
Input Impedance	40k Ω
THD + Noise	<0.004% @ 1 kHz, 8 ohms
Damping Factor	> 200, 20 Hz – 20 kHz
Overall Gain / Bal. or Unbal.	27 dB
Common Mode Rejection Ratio	> 90 dB, 20 Hz – 20 kHz
Absolute Phase Non-inverting	Pin 2 Positive
Inputs	Balanced (XLR)
Outputs	2 pair parallel binding posts
Power Consumption Idle	85 watts
Power Consumption Standby	1 watt
Amplifier Dimensions (h/w/d)	5.75” x 15.5” x 16.25” / 146mm x 394 mm x 413mm
Amplifier Weight	54 lbs. / 24.5 kg
Amplifier Shipping Weight	64 lbs. / 29 kg each

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