Model 825 (Out of Production)
USER MANUAL
REVIEWS
Experience the effortless magic of absolute authority. Vocalists and instruments materialize within an astonishingly concrete sound stage. From the most delicate solos to thundering orchestrals, emotion and music dance throughout a seemingly infinite frequency spectrum.
The Model 825 represents the ultimate benchmark of dynamic realism and expressive refinement. A quarter century of engineering passion expressed in the synergy of advanced technologies and timeless design. A stunning achievement inspired by the musicality of an enduring classic: the Rowland Model 8.
- 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.
| Output Power | 400 watts @ 8 ohms / 750 watts @ 4 ohms
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| Frequency Response | 5 Hz – 50 kHz, -3 dB |
| Input Impedance | 40k Ω |
| THD + Noise | 0.004%, 20 Hz – 20 kHz |
| Overall Gain | Switchable 26/32 dB |
| Inputs | 1 pr balanced (XLR) / 1 pr unbalanced RCA |
| Outputs | 2 pr parallel binding posts |
| Amplifier Dimensions (h/w/d) | 16.5” x 15.5” x 16.25” / 419mm x 394mm x 413mm |
| Amplifier Weight | 160.4 lbs. / 73 kg |