Boss WAZA Tube Amp Expander Amplifier Attenuator (Return Unit)


  • Supports Tube Amps up to 150W
  • Built-In 100W Class-AB Power Amplifier
  • Onboard 32-Bit / 96 kHz DSP
  • 22 Miked Cabinet Emulations

The BOSS Waza Tube Amp Expander is a comprehensive tube amp command center designed to function as a variable reactive load box, active analog power stage, miked cab emulator, IR loader, and recording interface, letting you change the volume of your tube amplifier without affecting its tone, dynamic response, or distortion character.

It features Resonance-Z and Presence-Z panel controls, which optimize the impedance interaction with your amp’s output transformer. Selecting from sixteen different settings, you can make your amp behave and respond as if it were connected to a speaker cab. The expander supports any tube guitar amp up to 150W.

Ten different rig setups can be stored in the unit, and each includes your custom effects and EQ settings, cab/IR selections, effects loop on/off, MIDI program change (for controlling external MIDI effects), and amplifier control status. Rigs can be recalled with a panel knob, and additional controls are provided for reverb and other functions. Onboard 32-bit / 96 kHz DSP ensures top-of-the-line effects processing without leaving the unit.

The Waza Tube Amp Expander features two parallel speaker outputs, three balanced XLR outputs (left, right, and mono), and a 1/4″ headphone output. A USB Type-B port is provided for direct recording to a Mac/Windows computer and convenient communication with the editor software. In addition to the MIDI 5-pin I/O, three 1/4″ jacks are presented, allowing you to hook up multiple controllers.

  • Tube amp command center built with Waza expertise and the Tube Logic design approach
  • Variable reactive load circuit with analog components supports tube amps up to 150W
  • User-adjustable impedance tuning matches the reactive load to your amp, retaining its natural tone, dynamic feel, and distortion characteristics
  • 10 recallable rig settings
  • Real-time performance control via GA-FC or FS-Series footswitches and MIDI I/O
  • Built-in 100W Class-AB power amplifier with analog design and seamless volume control
  • DSP section with 32-bit AD/DA, 32-bit floating-point processing, and 96 kHz sampling rate
  • Customizable stereo effects including compression, delay, reverb, and four EQs
  • 22 miked cabinet emulations with nine selectable close mic types and five room mic options
  • 32 slots for loading user speaker IRs
  • External effects loop with selectable series/parallel operation and control jack for switching amp channels
  • Parallel speaker outputs for connecting up to two cabs for gigging
  • Balanced XLR line outputs (mono and L/R stereo) for connecting to a FOH console, stage monitors, and recording devices
  • Headphones output for quiet practice with cranked-up amp tones
  • Dedicated editor software (Mac/Windows)
  • USB connectivity for direct audio recording and editor communication
UPC: 761294513590

Power Handling: 150W Impedance: 4/8/16 ohms Attenuation: Variable Ground Lift: Yes Inputs: 1 x 1/4" (powered signal in), 1 x 1/4" (fx return) Outputs: 2 x 1/4" (to speaker), 1 x XLR (mono line), 2 x XLR (L/R line), 1 x 1/4" (fx send) Headphones: 1 x 1/4" Other I/O: 2 x 1/4" (foot control), 1 x 1/4" (amp control), 1 x USB Type B Power Source: Standard IEC AC cable Height: 4.37" Width: 15" Depth: 11.68" Weight: 15 lbs.


Boss Waza Tube Amp Expander Power Cord 2 x Rack Mount Angle for EIA-2U GA-FC Sticker Limited 1-Year Warranty


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