Model 925 Mono Amplifier Features and Specifications
The Rowland Model 925 is a stunning four chassis statement sculpted from solid bars of aircraft aluminum.
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 925 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.
An extraordinary achievement inspired by the musicality of an enduring classic: the Rowland Model 9.
Machined Aluminum Chassis
Quad chassis precision-machined from
solid bar-stock T-6061 aircraft grade aluminum providing exceptional
thermal heat transfer/dissipation, RFI/EMI shielding, and resonance
The amplifier and power
supply of each channel are isolated from each other in separate chassis. High-current DC
power and low-current control signals are transferred between the
amplifier and power supply via custom made detachable cables.
Active Power Factor Correction
Power Factor Correction (PFC) in the power supply reduces AC line
harmonic noise pollution and increases AC line power utilization to 93%.
Voltage and current demands from the amplifier remain in phase with
each other which eliminates the transient, out-of-phase, high current
pulses common to the operation of all other non-PFC audio power
High-Efficiency Switch-Mode Power Supply
Powerful, efficient, 2500W 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
The power supply
is comprised of four DC to DC converters incorporating
“zero-current-switching” technology for high-efficiency and greatly
reduced levels of conducted and radiated noise.
4 pole Capacitors
Custom-made 4-pole capacitors integrated within the power supply further reduce any remaining residual noise.
isolated, discrete component, shunt-regulated power supply, providing
over 130 decibels of noise isolation, offers low broadband noise and
output impedance. This supplies noise-free DC power to all low-level
audio circuitry for battery-like performance.
Mains power is switched via a solid-state relay. Switching occurs only
during the AC mains zero voltage crossing period dramatically reducing
in-rush current during turn-on surges and providing a lifetime of
Ceramic Circuit Boards
input circuitry is implemented on mil-spec, multi-layer, low dielectric
constant, Rogers™ ultra-rigid ceramic circuit board substrate for
extremely low energy retention and absorption.
cancellation effects of balanced topology implemented throughout all
power and input/output circuits ensures greatly reduced distortion and
noise under dynamic signal conditions.
High-Precision Surface Mount Components
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.
Thin Film Resistors
resistors are low-noise, 0.1% thin film Surface Mount Devices (SMD)
type for extremely low thermal noise which complements the low-noise
characteristics of the active circuitry.
Transformer-Coupling and Isolation
coupled input circuitry provides universal component compatibility,
excellent common-mode noise rejection (CMRR) from the input source, and
virtually eliminates ground loop noise and RFI/EMI. Transformer coupling
ensures identical amplifier overall gain when using unbalanced inputs.
Rear Panel Controls
panel switching of input phase, overall gain, and input selection
Custom Input Jacks
XLR and RCA input jacks are custom-made Cardas connectors constructed
of copper, rhodium, gold, and Teflon materials for minimal signal loss
and excellent corrosion resistance.
Cutting-edge Output Circuitry
class-D audio power technology is based upon a non-hysteresis 5th order
self-oscillating control loop taking feedback only at the speaker
Extremely Low Distortion
circuitry ensures an extremely low distortion level of less than 0.004%
THD + Noise over the entire audio spectrum of 20 Hz to 20 kHz powering
any load ranging from 2 to 8 Ohms.
Stability and Flexibility
output impedance of less than 0.003 Ohms (3 milliohms) over the entire
frequency range of 20 Hz to 20 kHz ensures that all loudspeaker types
can be driven with impunity. Stability of the amplifier is guaranteed
under all conditions when driving any loudspeaker or loudspeaker cable
controlled error detection circuitry ensures protection of associated
loudspeaker components under many extreme operating conditions.
power efficiency of 93% at full power output afforded by this
technology ensures low energy consumption, low operating temperature,
and an extended service life of all components within the amplifier.
Parallel binding posts
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
front panel push-button switches the amplifier into standby mode.
Separate stand-by circuitry reduces AC mains power to less than 1 watt
during stand-by, ensuring international regulatory compliance.
1/8” (3.5mm) mini plug connector on rear panel permits amplifier power
on/standby switching in remote and home theater applications.
Removable 3-point self-leveling Delron chassis supports provide high frequency mechanical noise isolation.
430 watts @ 8 ohms / 850 watts @ 4 ohms
5 Hz – 50 kHz
THD + Noise
0.004%, 20 Hz - 20 kHz
> 1000, 20 Hz - 20 kHz
Overall Gain / Balanced or Unbalanced
Switchable 26/32 dB
1 pair balanced (XLR)
1 pair unbalanced (RCA)
2 pair parallel binding posts
Amplifier & Power Supply Weight
160.4 lb / 73 kg (per channel)
Amplifier & Power Supply Dimensions
16.5” x 15.5” x 16.25” / 419mm x 394mm x 413mm (per channel)
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26th of September, 2013