Jeff Rowland Design Group

Effortless. An amplifier's ability to drive a loudspeaker and accurately portray a musical composition's dynamic crescendos in lifelike manner rests in its capacity to provide instant and effortless power upon demand. Utilizing ICEPOWER™ power conversion technology to produce over 500 watts into 8 ohms and 1000 watts into 4, the Model 501 easily satisfies this criterion. Born from the same knowledge and experience that inspired the critically-acclaimed 300 Series, the Model 501 raises the bar to new heights in its achievement of sonic excellence in a small, efficient, low-cost package.

Exploding myths. Jeff Rowland Design Group has convincingly and consistently proven that careful and enlightened execution of design can overcome and reverse notions once thought of as audio heresy, i.e., line-level transformers, fully-balanced inputs and outputs, switching power supplies, and the list goes on. The 501 dispels the myth that only low-power amplifiers can faithfully honor the original source.

Satisfying demands. The finest modern loudspeaker designs, from diminutive studio monitors and massive multi-driver arrays to large, full-range electrostatics, require an unwavering source of amplifier power to convey music naturally and realistically. The great majority of loudspeakers present complex and difficult loads that must be driven in a linear manner. The Model 501 satisfies this demand while maintaining the precision of a lower powered amplifier.

Flexibility. Multiple Model 501s are as capable of powering a custom multi-channel home theater system as two units driving a full-range stereo loudspeaker system. Its diminutive size and low operating temperature allow for flexible placement in any listening environment.

Specifications >>

At Jeff Rowland Design Group, truly great audio has been reduced to this: The astonishingly powerful and incredibly efficient Model 102 stereo amplifier, definitive proof that good things can come in small sizes.

Utilizing the same ICEpower™ patented power conversion technology that has revolutionized modern amplifier design, the Model 102 packs a true 100 watt wallop in a tiny 3x13x7 inch machined solid aluminum housing virtually immune to resonance.

The newest member of the JRDG family of fine audio components, the 102 is the product of an obsessive quest to perform one of modern electronics' most difficult balancing acts - the creation of clean, dynamic power without the
unwanted and, now unwarranted, byproducts of excessive heat and mass.

The Model 102 achieves this goal by the innovative application of impressive new developments in power supply and power output stage design. This 10-pound marvel features a balanced input/output topology combined with true
dual-mono power supplies to deliver handsomely on the promise inherent in its elegant appearance.

Pound for pound, the Model 102 is simply an amplifier without peer, producing an entrancing and satisfying musical experience far out of proportion to its dimensions... and at a price that redefines value.

The JRDG Model 102, size one up and discover the true state of audio excellence, from the Jeff Rowland Design Group.

specifications >>

When attempting to describe an achievement so spectacular as to be proclaimed "revolutionary", words often fail to convey the depth of that achievement. Our listening persuades us that the Model 302 exposes the music to a greater degree than previously experienced - and yet the familiar Jeff Rowland sonic lineage is evident - a lineage steeped in constant efforts to develop products that honor the music.

Utilizing an extremely efficient output topology that maintains very precise control over all electrical parameters, the 300 Series amplifiers communicate the musical gestalt in startling fashion. This level of sonic sophistication is made possible by concentrating on physical and electrical parameters that adversely affect the delicate musical waveform.

The elimination of deleterious resonance can only be achieved by addressing the physical structure of the amplifier, our most non-resonant to date. In addition to pioneering the use of balanced, transformer-coupled circuitry in audio amplifier design, the utilization of commercial-grade power-factor correction modules ensures that anomalies related to "dirty" power never influence the music signal.