GZPA Reference 4PURE-SQ

The Ground Zero GZPA Reference 4PURE-SQ is designed specifically for discerning car audio enthusiasts who prioritize maximum sound quality over an extensive array of filters and tone controls. This analog 4-channel power amplifier from the Reference Series features Class AB technology, a balanced circuit design, and exceptionally short, direct signal paths.

The PURE concept deliberately avoids using additional filter and control stages in the audio signal. This ensures that the input signal is routed to the power amplifier via the most direct path possible. High-quality, carefully selected components and a preamp section optimized for sound quality form the foundation for precise, dynamic, and detailed sound reproduction.

A distinctive feature of the GZPA Reference 4PURE-SQ is its variable BIAS control. It allows the operating point of the Class AB power amplifier to be adjusted and has been further enhanced in the SQ version compared to the original model. Together with the redesigned preamp section and the improved signal-to-noise ratio, the power amplifier has been specifically tuned to meet the highest sound quality standards.

The amplifier’s design also underscores its high-end credentials. The RCA inputs feature rhodium-plated jacks, while the solid heat sink is engraved with the “Ground Zero” logo. A transparent Plexiglas base with LED lighting also offers a view of the amplifier’s intricate internal design.

With 4 x 150 watts RMS at 4 ohms, 4 x 270 watts RMS at 2 ohms, and 4 x 425 watts RMS at 1 ohm, the GZPA Reference 4PURE-SQ also offers ample power reserves. This makes it particularly well-suited for uncompromising multichannel and high-end SQ systems with high-quality speaker components.

Technical Specifications and Features

• Manufacturer: Ground Zero
• Model: GZPA Reference 4PURE-SQ
• Product Series: Reference
• Item Number: 11420032
• Amplifier Type: High-End SQ Power Amplifier
• Number of channels: 4
• Amplifier Technology: Class AB
• Circuit configuration: symmetrical
• Signal Path: Direct Signal Path / PURE Concept
• Variable BIAS control: Yes
• Output power at 4 ohms: 4 x 150 watts RMS
• Output power at 2 ohms: 4 x 270 watts RMS
• Output power at 1 ohm: 4 x 425 watts RMS
• Maximum output power: 2 x 1,000 watts
• Measurement standard for maximum output power: CEA-2006A at 10% THD+N
• Frequency response: 5 Hz – 38 kHz
• High-pass filter (HPF): No
• Low-pass filter (LPF): No
• Bandpass filter (BPF): No
• Bass Boost: No
• Phase control: No
• High-level input: No
• Auto-Turn-On: No
• Remote control connection: No
• Link mode: No
• RCA/Cinch jacks: rhodium-plated
• Components: carefully selected high-end components
• Heat sink: exclusive design with engraved "Ground Zero" lettering
• Case back: Plexiglas
• LED lighting: Yes
• Width: 236 mm
• Length: 590 mm
• Height: 67.5 mm
• Dimensions (W x L x H): 236 x 590 x 67.5 mm
  
  

Special Features

• High-Performance 4-Channel Amplifier for High-End Audio Systems
• Analog Class AB Amplifier Technology
• Symmetrically Designed Circuit Concept
• Short and direct signal paths
• Deliberate omission of active crossovers and additional controls that affect sound quality
• Adjustable BIAS operating point
• Revised SQ Preamplifier Section
• Carefully Selected Components for Exceptionally High Sound Quality
• Rhodium-plated RCA connectors
• 1-ohm stable operation per channel
• High power headroom up to 4 x 425 watts RMS
• Solid High-End Heat Sink
• Illuminated Plexiglas base
• Designed for car audio systems that prioritize sound quality above all else