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Boss Waza Tube Amp Expander

100W Class AB Tube Amp Expander with Built-In Audio Interface, Reactive Load Circuit, Active Analog Power Stage, Mic'd Cab Emulator, Powerful DSP, USB, and IR Loader.


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MSRP: Old Price $1,899.99 Discounted Price $1,338.99 Save : $561.00 (30%)
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MSRP: Old Price $1,899.99 Discounted Price $1,338.99 Save : $561.00 (30%)
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Bringing together a diverse range of professional tone tools for the very first time, the Waza Tube Amp Expander elevates the tube amp experience to a level of versatility for stage performing and studio recording never done before. This amazing device does it all—it's a variable reactive load box, active analog power stage, mic'd cab emulator, IR loader, and recording interface, all-in-one integrated unit that's road-ready and easy-to-use.

Waza Innovation for Lovers of Pure Tube Tone
Realized with Waza R and D expertise and the ever-evolving Tube Logic approach, the Waza Tube Amp Expander seamlessly complements and extends your tube amp, and all without affecting the unique tone and response that made you choose it in the first place. The initial concept for this unique device came during the development of the flagship Waza amplifier head. To comprehensively test and refine the amp's AC power voltage and output circuitry, the Boss team devised a custom load box with capabilities reaching far beyond those in any commercially available unit. This innovative design performed so successfully that it became the logical foundation for developing a next-generation toolkit for the modern tube amp player.

Cranked-Amp Tone and Feel at Any Volume
As a tube amp owner, you know that it sounds and feels best when it's cranked up loud and really cooking. But, if you're like most of us, it's a rare pleasure to be able to open up the volume enough to unlock that full expressive potential. Load boxes and volume attenuators driven by a tube amp's speaker output have attempted to solve this nagging volume issue for years. But, while they do lower the volume and provide workable results, they typically introduce artifacts that change the tone, dynamic response, and distortion character, leaving you with an unsatisfying experience. The Waza Tube Amp Expander's advanced reactive load section completely eliminates these artifacts, allowing you to experience your amp's true cranked-up sound and interactive feel while controlling the volume to suit any situation. A key feature is the Resonance-Z and Presence-Z panel controls, which optimize the all-important impedance interaction with your amp's output transformer. Selecting from sixteen different settings, you can make your amp behave and respond exactly as if it were connected to your favorite speaker cab. Any tube guitar amp up to 150 watts is supported, from vintage combos to modern high-gain heads.

Intense Customization
The Waza Tube Amp Expander works great out of the box, but connecting to the dedicated editor software via USB unlocks even further creative potential. First off, you're able to edit effects and EQs in micro detail. In addition, you can select from 22 different mic'd cabs for the direct outputs, each with your choice of five adjustable close-mic types plus three room-mic types for adding spaciousness and depth. There are even four user slots for loading your go-to speaker IRs if desired. Other tweaks are available too, including MIDI, system parameters, and a loudness contour for big, full tones at whisper-quiet levels. Favorite rig setups can be saved on your computer and organized as Live Sets for different gigs and recording scenarios.

  • First-of-its-kind tube amp command center, built with Waza expertise and the Tube Logic design approach
  • Advanced variable reactive load circuit with discrete analog components supports tube amps up to 150 watts
  • User-adjustable impedance tuning correctly matches the reactive load to your amp, retaining its natural tone, dynamic feel, and distortion characteristics
  • 10 recallable rig settings for storing favorite setups
  • Deep real-time performance control via GA-FC/FS-series footswitches and MIDI I/O
  • Built-in 100-watt Class AB power amplifier with discrete analog design and seamless volume control
  • Powerful DSP section with 32-bit AD/DA, 32-bit floating-point processing, and 96 kHz sampling rate
  • Customizable stereo effects with premium tone quality: compressor, delay, reverb, and four EQs
  • Twenty-two mic'd cabinet emulations with five selectable close-mic types and three room-mic options, plus four 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 FOH console, stage monitors, and recording devices
  • Headphones output for quiet practice with cranked-up amp tones
  • Dedicated editor software (Mac/Windows)
  • USB for direct audio recording and editor communication
  • Includes power cord, rack mount angle x 2, and GA-FC sticker

Get your Boss Waza Tube Amp Expander today at the guaranteed lowest price from Sam Ash with our 45-day return and 60-day price protection policy.

Things You Will Get:

  • Tube Amplifier Expander
  • Power Cord
  • Rack Mount Angle x 2
  • GA-FC Sticker

Enjoy your tube amp in a bedroom or at a loud bar!!


Spectacular piece of equipment. Allows user to control the volume of high powered tube amps while maintaining the integrity of the tone. Simply awesome. I use it with a Marshall studio vintage.



That Final Ingredient Missing From Your Expensive Guitar Rig


Pretty amazing! I've had just about every amp you can think of: Boogie, Marshall, Bogner Ecstasy, 5150, etc. And I've also used modeling rigs starting back in the 1990's with the old Boss GT-5 all the way up to the Line 6 Helix. I got back to tube amps here in 2019 with the Mesa TC-50 paired up with a TC Electronics G-System. Was using a popular reactive load box that includes a generic 4x12 IR cab on the XLR out to the Front Of House (FOH). Sounded great. But the Waza Tube Amp Expander reeled me in like a fish on a hook. Wow this thing sounds great! Now I'm able to play at any volume WITHOUT attenuating my amp. That's right...it's NOT an attenuator. It's a re-amping system. When you attenuate your amp it does change the tone. But the TAE doesn't. It re-amps it with a transparent digital amp that powers your guitar cab! GENIUS!!! And the XLR out to FOH? They have multiple choices of cabs AND an IR loader so you can load up your own third party IR cab (which I did with a great Ownhammer IR that I have) There are also onboard effects, eq, reverb, and an effects loop. I use the Waza TAE loop along with my G-System to get the best sounding effects possible...in the freakin' universe baby! LOL! This thing is fantastic and I highly, highly recommend it. -Robbie



Yes, I definetly recommend this product.


I use this as a attenuator for 2 of my amps. It works very well and I am quite happy with the wonderful sounds I can now achieve at lower volume. No regrets even though it is a little pricey. Also, I appreciate the good service and help I got from staff at Sam Ash store.



Waza Tube Amp Expander

5.0 3


Impedence 4/8/16 ohms
Effects Loop Yes
Inputs 1 x 1/4" (Powered Signal iI), 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)
Digital FX Yes
Line Out Yes
Footswitch I/O Type 1 x 1/4"
Footswitch Included No
Headphone Outputs 1 x 1/4"
Weight 5 lbs.
Dimensions 15 x 4-3/8 x 11-11/16 inches (WxHxD)
Warranty Info:

Effects pedals: 5 years parts, 3 years labor All other products: 1 year parts, 90 days labor

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