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Krell Duo 125 XD (125XD) Power Amplifier


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Krell Duo 125 XD (125XD) Power Amplifier
Duo 125 XD - 2 Channel Power Amplifier
125 Watt Amplifier Featuring Krell iBias Technology

Krell's New XD Technology
Krell’s “XD” (Xtended Dynamics, Xtended Dimensionality, Xtended Detail) upgrade for the iBias amplifiers takes analready great sounding amplifier and raises its performance to the next level. “XD” is a classic example of Krell’scontinuous R & D efforts reaping benefits across multiple product lines. During the development of the K-300iIntegrated Amplifier we discovered substantial sonic improvements by lowering the output impedance belowtraditional norms. So we applied this technique to our existing line of amplifiers and the improvement was sosubstantial that it required a unique designation, hence, “XD.”

It was no simple matter to just lower the output impedance. This affects the amplifier’s stability and transientresponse so each stage prior to the output stage had to be re-tuned to work optimally with the lower outputimpedance. This lower output impedance exerts more control over the speaker drivers and damps out unwantedvibrational modes, allowing a more accurate reproduction of the original signal.

Technical Specifications:-

Frequency response:
20 Hz to 20 kHz +0, -0.08 dB
0.5 Hz to 100 kHz +0, -3 dB

Signal-to-noise ratio:
> 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

Input Impedance:
Single-ended: 100 kΩ
Balanced: 200 kΩ

Input sensitivity:
Single-ended or balanced: 1.63 V RMS

Output power:
125 W RMS at 8 Ω
250 W RMS at 4 Ω

Output voltage:
89.4 V peak-to-peak
31.6 V RMS

Output current:
18 A peak

Slew rate:
40 V/μs

Output impedance:
< 0.015Ω, 20 Hz to 20 kHz

Damping factor:
> 530, 20 Hz to 20 kHz, referred to 8 Ω

Power consumption:
Standby: 1 W
Idle: 58 W
Maximum: 1350 W

Heat output:
Standby: 3.42 BTU/hr.
Idle: 198 BTU/hr.
Maximum: 4617 BTU/hr.

Inputs:
2 single-ended via RCA connector
2 balanced via XLR connector

Outputs:
2 pairs binding posts

Dimensions:
17.1 in. W x 7.65 in. H x 21.10in. D
434 mm W x 194 mm H x 536mm D

Weight:
60 lbs., 27.3 kg (shipping)
50 lbs., 22.7 kg (unit only)

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