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Circuitry Highlights

Krell iBias Class A technology allows our latest amplifiers to run in full Class A mode to full power while minimizing heat generation. All signal gain is realized in the current domain using discrete, proprietary, multiple-output current mirrors with extraordinary open loop linearity. There are no generic integrated circuits or op amps used anywhere. The signal path is fully complementary and balanced. Independent complementary pre driver and driver stages for the positive and negative output transistors make the output stages extremely fast and linear. Krell amplifiers are fully direct-coupled, with no capacitors in the audio signal path. This design gives the Krell amplifiers lower internal impedance, which allows firmer, more precise control of your speakers.

Power Supply Highlights

Two 700VA toroidal transformers feed amplifier modules that include the audio circuitry, rectifier, and power supply filtering mounted to an individual heat sink. This design shortens the electrical path from the power supply to the output transistors, reducing the overall impedance and allowing the circuit to respond faster and control the speakers better and more accurately.

Feature Highlights

Network connectivity brings convenience, monitoring, and reporting to end users from any smartphone, tablet, or laptop. Amplifier configuration options include display brightness and timeout. For energy conservation, the amplifiers can be programmed to power off at a preset time of inactivity. Individual channels can be muted and firmware updates can be initiated from the web server.

XD Explained

Krell’s “XD” (Xtended Dynamics, Xtended Dimensionality, Xtended Detail) upgrade for the iBias amplifiers takes an already great sounding amplifier and raises its performance to the next level. “XD” is a classic example of Krell’s continuous R&D efforts reaping benefits across multiple product lines. During the development of the K-300i Integrated Amplifier we discovered substantial sonic improvements by lowering the output impedance below traditional norms. So we applied this technique to our existing line of amplifiers and the improvement was so substantial 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 transient response so each stage prior to the output stage had to be re-tuned to work optimally with the lower output impedance. This lower output impedance exerts more control over the speaker drivers and damps out unwanted vibrational modes, allowing a more accurate reproduction of the original signal.

Technical Specifications

175 Watt Amplifier Featuring Krell iBias™ Technology

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
>115 dB, “A”-weighted

26.2 dB

Total harmonic distortion
<0.03% at 1 kHz, at 175 W, 8 Ω
<0.13% at 20 kHz, at 175 W, 8 Ω

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

Input sensitivity
Single-ended or balanced: 1.84 V RMS

Output power
175 W RMS at 8 Ω
350 W RMS at 4 Ω

Output voltage
106 V peak-to-peak
37 V RMS

Output current
13 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: 73 W
Maximum: 1500 W

Heat output
Standby: 3.42 BTU/hr.
Idle: 250 BTU/hr.
Maximum: 5137 BTU/hr.

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

2 pairs binding posts

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

70 lbs., 31.8 kg (shipping)
60 lbs., 27.3 kg (unit only)

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