Zapco - ST-68X DSP III - Class AB, 4-Ch, DSP, optional HD-BT Power 2Ω: 4 x 35W, 4Ω: 4 x 25W

Description:
The Zapco ST-68X DSP III is a compact 4-channel Class AB amplifier integrated with a powerful 6-in / 8-out DSP processor, offering the perfect blend of precision tuning and Zapco’s signature analog warmth. Despite its compact size, it delivers rich, clean power with advanced digital control. With features like a 31-band EQ, time alignment, adjustable crossovers, and optional HD-BT high-resolution Bluetooth streaming, the ST-68X DSP III is designed for audiophiles, OEM integration, or SQ competitors seeking full DSP flexibility in a small-footprint amplifier.

• Model: ST-68X DSP III
• Type: Class AB 4-Channel Amplifier with Integrated 6-Input / 8-Output DSP
• Amplifier Section Power Output (RMS):
 • 4 Ω Stereo: 4 × 25 W
 • 2 Ω Stereo: 4 × 35 W
• DSP Processor:
 • Cirrus Logic 32-bit / 192 kHz
 • 6 Analog Inputs / 8 Processed Outputs (4 amplified, 4 preamp RCA)
 • Optional HD-BT Module (for 24-bit aptX HD Bluetooth streaming)
• Frequency Response: 10 Hz – 30 kHz (±1 dB)
• Signal-to-Noise Ratio: > 100 dB
• THD + N: < 0.05% at rated power
• Input Sensitivity: 0.2 V – 8 V (variable)
• Input Impedance: 20 kΩ (balanced) / 10 kΩ (unbalanced)
• Equalization (DSP):
 • 31-band Parametric EQ per channel
 • Adjustable Q, gain, and frequency for precision tuning
• Crossover Filters (DSP):
 • High-Pass / Low-Pass / Band-Pass selectable per channel
 • Slopes: 6 / 12 / 18 / 24 / 36 / 48 dB per octave
• Time Alignment: 0 – 20 ms in 0.02 ms steps
• Phase Control: 0° / 180° per channel
• Preset Memory: Up to 10 user-storable tuning profiles
• Bluetooth Streaming (Optional): 24-bit aptX HD via Zapco HD-BT module
• Protection Circuits:
 • Thermal
 • Short circuit
 • DC offset
 • Over/under voltage
• Cooling System: Passive aluminum heatsink with smart thermal design
• Power Supply: Regulated MOSFET PWM design
• Fuse Rating: 2 × 25 A
• Dimensions: 7.9″ (L) × 6.5″ (W) × 2.0″ (H)
• Weight: Approx. 4.6 lb (2.1 kg)