Positive Grid Rack Amp Match Rackmount Amplifier Head 600w (Ex Display)

Positive Grid BIAS Rack Power Amplifier – 600W Guitar & Bass Modelling Rack (Ex-Display)

Ex-Display Model – This unit has been used for in-store demonstration. It may show minor cosmetic blemishes or signs of handling. It has been carefully inspected and tested, and is considered new, with full functionality guaranteed.

The Ultimate Fusion of Tone, Power & Precision.

The Positive Grid BIAS Rack Power Amplifier delivers the sound-shaping freedom of digital amp modelling with the punch and realism of a professional 600-watt power stage. Designed for guitarists and bassists who want total tonal control, the BIAS Rack captures the essence of any amp — from boutique tube stacks to modern metal monsters — including cabinet and microphone character.

With the included BIAS Amp Pro software, you can design, match, and share custom amp models through ToneCloud®, where thousands of tones from players and engineers around the world are available to download. Then, take your creations straight to the stage with powerful, zero-latency performance.

Amp Match® & ToneCloud® Integration

Using Amp Match® technology, BIAS Rack precisely recreates the tonal fingerprint of your favourite amps — capturing subtle nuances that make each rig unique. Load and fine-tune cabinet and mic combinations, or browse and share presets from the global ToneCloud® community.

Hardware Meets Software

The BIAS Rack connects seamlessly to your computer or iPad, integrating perfectly with BIAS Amp Pro (Mac/PC) or BIAS Amp for iPad via USB or Bluetooth. Edit, store, and recall tones instantly, all with real-time response and the flexibility of component-level amp design.

Premium Components, Professional Power

Inside, the BIAS Rack is engineered with audiophile-grade converters, op-amps, and components to deliver uncompromising clarity and dynamic range. Its Class D power amplifier produces 600 watts of output (at 8 ohms), faithfully reproducing your custom tones whether you’re recording in the studio or performing live. You can safely connect 4 Ω, 8 Ω, or 16 Ω cabinets for complete versatility.

Create Your Signature Sound

Design your dream rig from the ground up:

• Swap virtual preamps, tone stacks, tubes, transformers, cabinets, and mics
• Tweak every stage for exact tonal character
• Save up to 25 user presets directly into the rack for instant recall

Technical Specifications

Power Output: 600 W @ 8 Ω (Class D)

Compatible Loads: 4 Ω, 8 Ω, 16 Ω speaker cabinets

Voltage/Frequency: 100–240 V AC, 50–60 Hz

Dimensions (H × W × D): 3.5″ × 19″ × 13.5″ (8.9 × 48.3 × 34.3 cm)

Weight: 15 lbs (6.8 kg)

Connections:

• Instrument Input: ¼″ Hi-Z
• Effects Loop: ¼″ Send/Return
• Headphone Output: ¼″ TRS
• Direct Outputs: XLR balanced & ¼″ unbalanced
• External Pedal: ¼″ TRS
• MIDI: 5-pin In/Out/Thru
• USB: Connects to BIAS Amp Pro for Mac & Windows
• Bluetooth: Connects to BIAS Amp for iPad