The Krell KSA‑100S is a legendary high-end, solid-state stereo power amplifier from the era of Dan D’Agostino, a period marked by meticulous engineering and a focus on musical integrity. Renowned for its immense power and robust performance. From the first note, it brings a sense of authority, control, and musicality that makes the speakers disappear and the performance take center stage. Every drum strike, every bass line, every subtle vocal inflection feels alive, natural, and effortless.
This amplifier doesn’t just deliver watts; it delivers emotion and presence. With its sophisticated Sustained Plateau Bias Class‑A design, the KSA‑100S combines the warmth, smoothness, and musical coherence of Class‑A operation with the power and control needed for demanding speakers. The result is a sound that’s deep, articulate, and immersive, yet never harsh or fatiguing.
The KSA-100 is built like a fortress and engineered with precision, it embodies the philosophy that true amplification is invisible — the electronics fade away, leaving only the music, pure and compelling. For listeners who crave both power and soul, this amplifier transforms every note into a living, breathing performance.
Specifications
Power Output:
• 100 W per channel into 8 Ω (stereo)
• 200 W into 4 Ω
• 400 W into 2 Ω
• 800 W into 1 Ω (power doubles with impedance drop)
Distortion: ~0.1 % at 1 kHz; ~0.5 % at 20 kHz (full power)
Frequency Response: ~1 Hz – 150 kHz
Input Sensitivity: ~1.4 V RMS
Input Impedance: ~47 kΩ
Gain: ~26 dB
Dimensions: ~19.25″ W × 8.5″ H × 19.25″ D