B&K ST1400 Series 2 Solid State Power Amplifier

B&K Components ST1400 Series II (often called Series 2) is a solid-state stereo power amplifier from the late 1990s (Series II reportedly released around 1998), produced by B&K Components Ltd. of Buffalo, New York. It was designed as a compact, high-current, versatile two-channel amp for hi-fi and home theater/audio-video systems. Condition Notes (Excellent Condition) In **excellent/like-new condition**: - Pristine cosmetics: Minimal to no scratches on the black or dark faceplate and chassis, clean controls, bright LEDs, and intact labeling. - Full functionality: Both channels working perfectly, no distortion, hum, or noise.

-Key Specifications

**Power Output**: 125 watts per channel into 8 ohms (at 1 kHz); 185 watts per channel into 4 ohms. It is described as **very conservatively rated** with strong headroom and current delivery. - **High Current Capability**: Up to 30 amps peak-to-peak, making it stable and powerful with demanding or lower-impedance speakers. - **Frequency Response**: 5 Hz – 45 kHz (wide bandwidth for full-range audio). - **Total Harmonic Distortion (THD + Noise)**: 0.09% at 1 kHz (low distortion for clean sound). - **Input Sensitivity**: 1.2 volts. - **Input Impedance**: 33.2 k ohms. - **Damping Factor**: Strong control over speaker cones (specific number varies in references but supports tight bass). - **Inputs**: Both unbalanced RCA and balanced XLR (with a switch for balanced operation), plus level controls per channel. - **Outputs**: Five-way binding posts (banana/spade compatible) for each channel. - **Other Features**: 12V trigger/control muting input/output for system integration, heavy toroidal transformer, MOSFET output devices, and a robust build (around 28 lbs / ~12.7 kg, with a solid aluminum front panel). - **Dimensions**: Roughly standard rack-mountable size for the era (exact figures ~17" wide chassis typical for B&K). ### Sound Characteristics Users and reviews consistently describe B&K amps like the ST1400 Series II as having a **musical, warm-to-neutral, "organic" sound** rather than overly analytical or bright. Key traits include: - **Smooth and forgiving highs** (sometimes noted as slightly rolled-off or with a pleasant "MOSFET mist" for airiness without harshness). - **Detailed mids** with good presence and body. - **Strong, authoritative low end** with good extension and control. - **Spacious soundstage** with depth, width, and a sense of realism—capable of sounding "sweet and airy" at the top while delivering powerful bass. - Overall, it's praised for being **musical and enjoyable** for long listening sessions, driving a wide range of speakers well (including efficient ones like Klipsch). It excels in both stereo hi-fi and home theater setups.