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Boss Tube Amp Expander Variable Active Load Box

Take your valve amp to a new realm of tonal possibilities



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Product Description

The Waza Tube Amp Expander is BOSS' answer to the demands of many modern players; those looking to add more flexibility to their traditional valve amp sound for both performing and recording applications. 

If you're someone that adores the genuine, analogue tones offered by real valve amps, the BOSS Waza Tube Amp Expander can take your amplifier to a new realm of tonal possibilities and versatility.

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Get the best tones from your amp at safe levels

In essence, this unit does it all. First and foremost, the Tube Amp Expander is a variable active load box. This lets you connect your valve amp combo or head to the Waza Tube Expander, with the unit able to attenuate its volume. With adjustable impedance tuning, you can match your amp with the unit for reliable and safe use, accomodating for amps with up to even 150W of headroom. 

With the reactive load circuit, you can crank your tube amp up to its tonal sweet spot, with the unit able to reduce the overall level to a low and user-friendly volume, thanks to BOSS' Tube Logic technology. With Resonance-Z and Presence-Z controls on the front panel too, you can also further EQ the sound of your amp to suit any venue or space.

Setup your amp perfectly for recording or live applications

That's not all though, as this device is an active analogue power stage, a mic'd cab simulator, impulse response loader and recording interface. For tracking guitars at home or in a studio, these features allow you to experiment with and refine your tones to the finest of detail.

Featuring 7 mic'd cab emulations with 5 selectable microphone types, you can also load in 4 of your own favourite cabinet impulse responses. So if you'd rather leave your cab at home when playing live, you can just rely on the IRs and send a line-out directly to a PA system. And for recording, simply match your amp up to the best-sounding virtual cab and mic, and even use the USB output for direct audio recording to your computer!

With 10 recallable rig settings, you can store your favourite setups and switch between them with a dedicated control, or even via an external footswitch! This lets you easily flick between your patches on-the-fly.

Unparalleled connectivity & Built-in Effects

The connectivity options available with the BOSS Waza Tube Amp Expander are also astounding. With parallel outputs that can be connected to two cabs, the Waza Tube Amp Expander's 100W Class AB analogue power stage takes even a low-wattage amp to stage-standard volumes! 

The device features balanced XLR outputs that can be connected to an audio interface for direct recording or to a PA system for live use. With a mono output, there are also stereo XLR outputs that let you take full advantage of the Tube Expander's built-in reverb and delay effects. Also boasting a compressor and 4 EQs, you can really tweak your tones to perfection.

An FX loop section gives you the opportunity to also add your own external effects, such as moduation and time-based pedals. This is great if you own a vintage or boutique-style tube amp without an effects loop. Switchable for series or parallel operation, you can really enhance your sonics.

Like we mentioned, the USB output lets you use the BOSS Waza Tube Amp Expander as an audio interface, enabling you to record directly to your DAW/computer. This port also lets you connect to BOSS' editor software, allowing you to edit effect settings and more in superb detail.

There's also a headphone output, so you can practice silently if you have particularly attentive neighbours, while enjoying the sweetest tones offered by your valve amp!


  • 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
  • Seven mic’d cabinet emulations with five selectable mic types, 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
Elliot Stent author picture

Written by Elliot Stent

Customer Reviews


8 reviews





Trusted Customer20th May 2021

I bought this for use with my 5 watt Marshall guitar amplifier which is far too loud for home use. Using the TAE as an attenuator I can get the best sound from my amp at neighbour friendly volumes. Have also started to investigate the onboard effects and pre loaded IR's within the TAE which sound great through headphones. The Boss Waza TAE is expensive but packed with features and a really useful piece of equipment.

Value 4Looks 4Durability 4Sound 5

Trusted Customer30th Apr 2020

I have a primitive all valve amp - nothing but volume and tone control, instrument in, speaker out - that's it. The Tube Amp Expander does exactly what it says - it takes my primitive amp and expands it by adding an FX loop, equaliser and reverb. It can add compression and delay effects. It has absolutely hands down the best attenuation I've ever used - smooth, all volume ranges, not stepped! - with adjustable EQ curves and it even has software switchable Fletcher-Munson. It can be used, if necessary, the other way to boost a small wattage amp up to 100 watts if required. I can practice through headphones. It has cab, microphone and room emulation and I can load in Impulse Responses on top of that. It even works as an audio interface so I can record my amp sounds straight into my DAW. Boss thought of everything. This is the best bit of kit I've ever bought to really complement and expand by amp. Excellent.

Value 5Looks 5Durability 5Sound 5

Trusted Customer21st Feb 2020

Early days yet, but very happy with how it allows me to get my JTM45 & AC30 to their 'sweet spots' at lower volumes, add a touch of reverb & have other FX in the loop. The app is easy to use & I'm looking forward to using the cab sims for gigs & recording soon. If you love your no master volume, no reverb, no FX loop valve amp, this is well worth the investment.

Value 4Looks 5Sound 5

Christopher Buckley21st Oct 2019

Whatever your reasons, it is something you need! For what I do this is a most worthwhile investment.

Trusted Customer5th Sep 2019

Better result then expected. Saved my life, my ear, great sound....Best decision I've made.

Mr Morgan Adam1st Sep 2019

One of the best pieces of kit I’ve bought.

Trusted Customer23rd Aug 2019

This has made a real difference in my ability to practice at home without deafening everybody. It is easy and intuitive to use. It would be interesting to see a shoot-out with the Ox Box.

Mr Robert Drath17th Aug 2019

Attenuates nicely, so i can get those cranked AC30 tones at home level. Was also impressed by its use as an audio interface into my laptop via USB, I didn't have to use another interface. Would have liked some more mic options out of the box and the ability to mix two mics, however you can record direct with the cab/mic sim bypassed or load in your own IRs if you want. Make sure you have your own USB cable (type B printer style cable) and the necessary speaker cables because only the power cable comes with the TAE.

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Andertons Music Company's Registered Office: 58-59 Woodbridge Road, Guildford, GU1 4RF. Andertons Music Company acts as a credit broker and not a lender and only offers credit products from Secure Trust Bank PLC trading as V12 Retail Finance. Not all products offered by Secure Trust Bank PLC are regulated by the Financial Conduct Authority. Andertons Music Company is authorised and regulated by the Financial Conduct Authority, firm registration number 716155. Credit provided subject to age and status.