Krell KSA-250
The Krell KSA-250 is a legendary, heavy-duty solid-state stereo power amplifier from the early 1990s. Known for massive build quality and immense current delivery, it is conservatively rated at 250 watts per channel into 8 ohms and can double its output down to staggering low-impedance loads. Key Specifications Power Output : 250W per channel into 8 ohms (real-world tests show ~320W), 500W into 4 ohms, 1,000W into 2 ohms, and up to 2,000W into 1 ohm. Design : High-bias Class-A/AB operation featuring balanced input-to-output circuitry. Internal Build : Utilizes gold-plated solid copper bars instead of traditional internal wiring to handle extreme current. Connections : Balanced (XLR) and single-ended (RCA) inputs, with dual sets of 5-way binding posts per channel for bi-wiring. Physical Size : Extremely heavy and large, weighing around 50 kg (110 lbs). External Dimensions : Width 482 x Height 215 x Depth 620 mm Weight : 58 kg Output : 500W + 500W (4Ω) 250W + 250W (8Ω) Input Sensitivity : 2.45V Input Impedance : 47kΩ Frequency Response : 5Hz to 85kHz -3dB (power band wide) Total harmonic distortion: within 0.1% S/N Ratio : 96dB or higher Damping Factor : 150 Power Consumption : 900W (maximum power consumption) Sound and Performance Control : Renowned for an effortless, authoritative grip on difficult or low-impedance loudspeakers that other amps struggle to drive. Tonal Character : Warm, deep, and dynamic bass response with a rich presentation and expansive soundstage. Drawbacks : Runs very hot due to high idle current and places a heavy demand on household electricity.
The Krell KSA-250 is a legendary, heavy-duty solid-state stereo power amplifier from the early 1990s. Known for massive build quality and immense current delivery, it is conservatively rated at 250 watts per channel into 8 ohms and can double its output down to staggering low-impedance loads.
Key Specifications
Power Output: 250W per channel into 8 ohms (real-world tests show ~320W), 500W into 4 ohms, 1,000W into 2 ohms, and up to 2,000W into 1 ohm.
Design: High-bias Class-A/AB operation featuring balanced input-to-output circuitry.
Internal Build: Utilizes gold-plated solid copper bars instead of traditional internal wiring to handle extreme current.
Connections: Balanced (XLR) and single-ended (RCA) inputs, with dual sets of 5-way binding posts per channel for bi-wiring.
Physical Size: Extremely heavy and large, weighing around 50 kg (110 lbs).
External Dimensions: Width 482 x Height 215 x Depth 620 mm
Weight: 58 kg
Output: 500W + 500W (4Ω) 250W + 250W (8Ω)
Input Sensitivity: 2.45V
Input Impedance: 47kΩ
Frequency Response: 5Hz to 85kHz -3dB (power band wide)
Total harmonic distortion: within 0.1%
S/N Ratio: 96dB or higher
Damping Factor: 150
Power Consumption: 900W (maximum power consumption)
Sound and Performance
Control: Renowned for an effortless, authoritative grip on difficult or low-impedance loudspeakers that other amps struggle to drive.
Tonal Character: Warm, deep, and dynamic bass response with a rich presentation and expansive soundstage.
Drawbacks: Runs very hot due to high idle current and places a heavy demand on household electricity.
