The Krell KSA-150 is a legendary, high-current solid-state stereo power amplifier known for its pure Class A operation and massive power delivery into low-impedance loads.

Power Output

8 Ohms: 150 Watts per channel
4 Ohms: 300 Watts per channel
2 Ohms: 600 Watts per channel
1 Ohm: 1,200 Watts per channel

Technical Specifications

Circuitry: Pure Class A operation
Frequency Response: 0Hz - 250kHz
Signal-to-Noise Ratio: 120 dB (A-weighted)
THD & IM Distortion: Less than 0.1% under all conditions
Input Sensitivity: 1.8V to 2.3V
Input Impedance: 47,000 ohms (non-inverting & inverting)
Damping Factor: Greater than 500 (from 20Hz to 20kHz)
Slew Rate: In excess of 100 volts/microsecond

Physical Specifications

Dimensions: 19" W x 8.5" H x 16.75" D (add 2.5" depth for handles)
Weight: Approx. 63 kg (139 lbs) unboxed
Power Consumption: 7 - 12 Amps continuous

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The Krell KSL-2 is a fully balanced, solid-state preamplifier featuring a high-bias pure Class A direct-coupled circuit, a 50 VA toroidal power supply, and military-standard components. It was originally offered with an optional, configurable phono stage.

Audio Performance

Frequency Response: 0.5 Hz to 450 kHz (-3 dB)
Total Harmonic Distortion (THD): 0.01%
Signal-to-Noise Ratio (SNR): 95 dB to 98 dB (line)
Gain: 7 dB to 10 dB

Impedance & Connectivity

Input Impedance: 47k Ω
Output Impedance: 25 Ω
Inputs: Balanced (XLR), Single-Ended (RCA), and optional Phono
Outputs: Balanced (XLR), Single-Ended (RCA)

Physical Specifications

Dimensions: 18" W × 2.25" H × 13.75" D
Weight: 20 lbs (9 kg)
Power Consumption: 35W

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