Ground Zero’s stunning limited-edition 30th anniversary amplifier.
The GZA 125.4-30A is a 4-channel amplifier that embodies the expertise and technical knowledge Ground Zero has accumulated over its 30-year history. This amplifier is truly something you need to hear and experience.
Ground Zero has also paid special attention to the amplifier’s elegant exterior, finished with an impressive black coating reminiscent of piano lacquer. The amplifier’s casing serves as a massive heatsink, keeping the internal components cool even under demanding use.
Features:
• Operates in Class A/B
• Dedicated BIAS adjustment
• OPA 2134 operational amplifier
• MUNDORF® audio capacitors
• This amplifier has no filters, ensuring the signal travels to the output stages as directly as possible
Specifications
Channels: 4
Output Power (@ 4Ω) 4x 125 Watts RMS
Output Power (@ 2Ω) 4x 215 Watts RMS
max. Output Power bridged (CEA-2006A / 10%THD+N) 2x 480 Watts
Frequency Response 5 Hz – 70 kHz
SNR: 110 dB (@ 100 Watt A-weighted)
Damping Factor: 800
BIAS Setting
Dimensions (w x l x h) 195 x 360 x 53 mm / 7.70“ x 14.17″“ x 2.10“






