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Jeff Rowland Model 925 Mono Power Amplifier
Jeff Rowland Model 925 Mono Power Amplifier

Jeff Rowland Model 925 Mono Power Amplifier

SKU: Model 925Jeff Rowland
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Product Description

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. A stunning 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 control.

Functional Isolation

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

Active 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 amplifiers.

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 power sources.

Zero-Current Switching

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.

Noise Isolation

An 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.

Solid-State Relay

AC 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 trouble-free switching.

Ceramic Circuit Boards

All 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.

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-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.

Thin Film Resistors

All 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

Transformer 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

Rear panel switching of input phase, overall gain, and input selection (XLR/RCA).

Custom Input Jacks

Both 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

Innovative class-D audio power technology is based upon a non-hysteresis 5th order self-oscillating control loop taking feedback only at the speaker output.

Extremely Low Distortion

Unique output 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

An 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 type.

Error Detection

Extensive microprocessor controlled error detection circuitry ensures protection of associated loudspeaker components under many extreme operating conditions.


A 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

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.


All orders are processed within 48 hours from date of order.

We offer Free Ground Shipping on all orders regardless of size.  

  • If you would like to receive your order quicker you can request Express shipping during Check-Out in the Comments section.  Additional charges will apply.
  • In-stock items are shipped from our Vancouver warehouse and will reach major Canadian cities in 5-7 business days.
  • Items not in stock will either ship from one of our manufacturer partners' warehouses or in rare cases first must be sent to Vancouver and then to you.  
    • If the expected arrival to you will be more than 7 business days you will be notified by email and at that point you will have the option to proceed or if you cannot wait then order can be cancelled.

Returns Policy 

We will gladly:

  • (a) exchange a product that is not special ordered, or shipped from one of our partner warehouses, for a new product of equal value (product purchased must be unopened)
  • (b) exchange a product if it is defective or damaged for the same product

within 15 days after the product has been delivered to you.

Returns for refund are not accepted.

For an exchange, you must notify us by email at We will acknowledge receipt of your email by reply and assist you in returning the product as identified below. Make sure to send and have your return package post marked within the 15 days after the product has been delivered to you.


  • Headphones may not be returned or exchanged for any reason, only defective units will be replaced for the same model
  • Items that have been opened may not be returned


Notwithstanding the foregoing, you may cancel an order if the product is not delivered to the delivery address on your order form within 30 days of the date your order is accepted.

To cancel, you must notify us by email at We will acknowledge receipt of your email and process the cancellation.

Returns Packaging:

Products returning for exchange must be unused and in their sealed, original factory packaging.

Buyer is responsible for return shipping costs.

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