KRELL DUO-125XD 125w Stereo Power amp class-A w/ iBias technology
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Krell Class A iBias Technology
Krell’s new line of iBias amps promise class A performance without the usual pitfalls—high power consumption and lots of heat. The new amps use a fan-cooled chassis to pull off that trick and the result is a series of highly powerful yet compact amplifiers. The new iBias design allows the amp to actively measure the current flow to the speakers and adjusts the amps bias to meet demand—if full power is called for, then full power is what you get. However, if full power is not needed, the amp adjusts the bias so that energy isn’t wasted the way it is in traditional class a designs.
The new amps fit in a standard rack—something that was not possible with old-school Krell amps. This was achieved by using ultra-quiet fans—active ventilation. That makes these new amps a great fit for high-end audio and home theatre installations. The new amps are as transparent and dynamic as we have come to expect from Krell.
Krell’s history is rich with breakthrough Class A amplifiers that have helped build the Krell legacy of offering the best sounding amplifiers available. Audiophiles have always considered Class A technology to be the best sounding operating state for amplifiers. However, despite Class A’s unrivaled sound quality, it has fallen out of fashion because of recent demands to reduce power consumption and heat in home electronics products. Krell engineering took this challenge and redefined the meaning of high performance power amplifier. Our goal – unmatched performance, elegant design, and a compelling array of features. The breakthrough – a patent pending circuit delivering Class A operation without the excessive heat and wasted energy of conventional designs, housed in a striking new form factor, with network connectivity for advanced access and monitoring. The sound is open and unconstrained, in a manner that rivals live performance and the true sound of voices and instruments. Music and dialogue are reproduced with a richness, detail, and startling dynamics that fill a room.
When developing the DUO125-XD, David Goodman, our Director of Product Development, whom has been with Krell since 1987 and was largely responsible for design work on all Krell products, discovered that with modifications to the output stage, we could vastly improve sound quality, across the board, to all of our amplifiers.
A deeper, darker, blacker background that provided significantly better macro and micro dynamics, more silence between the notes. Vocals and midrange took on an organic, yet more vibrant tone, enabling us to hear much more body, and even though our amps were great before, there was a very significant improvement.
The speakers disappeared; yet, instruments were more focused with appropriate size and specific soundstage locations. All in all, a much better sounding, much improved experience that was easily, immediately heard by all that listened.
Features & Specifications
20 Hz to 20 kHz +0, -0.08 dB
0.5 Hz to 100 kHz +0, -3 dB
>95 dB, wideband, unweighted, referred to full power output
>112 dB, “A”-weighted
Gain; 25.8 dB
Total harmonic distortion
<0.03% at 1 kHz, at 125 W, 8 Ω
<0.17% at 20 kHz, at 125 W, 8 Ω
Single-ended: 100 kΩ
Balanced: 200 kΩ
Input sensitivity: Single-ended or balanced: 1.63 V RMS
125 W RMS at 8 Ω
250 W RMS at 4 Ω
89.4 V peak-to-peak
31.6 V RMS
Output current: 18 A peak
Slew rate; 40 V/μs
Output impedance: <0.038 , 20 Hz to 20 kHz
Damping factor: >210, 20 Hz to 20 kHz, referred to 8 Ω
Standby: 1 W
Idle: 58 W
Maximum: 1350 W
Standby: 3.42 BTU/hr.
Idle: 198 BTU/hr.
Maximum: 4617 BTU/hr.
2 single-ended via RCA connector
2 balanced via XLR connector
Outputs: 2 pairs binding posts
Dimensions: 434 mm W x 194 mm H x 536mm D
27.3 kg (shipping)
22.7 kg (unit only)