Upsizing 212/1215/215

A niche vertical monster for anyone with a bigger amp, wanting bigger lows, or even some 15" guitar cab action. Customisable to the nth degree!

On the face of it this looks like a wider version of our Uprising, hence the upSIZING name, to look good under all those amps that are more than 19" wide but not full Marshall width. And yes, if you want a wider vertical 2x12" cab then this is perfect. But there's more...

The standard version of the Upsizing has a single AVD for the top speaker only and two ports to tune the cab - it's basically a vertical version of the Radical 212H, with a thicker chunkier deeper tone than the Uprising. Here's all the other Upsizing 212 enclosure versions:

1. Dual AVD - this sounds more like the Uprising but with deeper/bigger lows.

2. Low tuned - if you're downtuning a lot then choose this.

3. Ultra-low tuned - if you're downtuning your seven or baritone or playing a Bass VI, then choose this.

Click here to visit the Specialist AVD cab customisation page for more info.

And this cab isn't only available as a 2x12" - you can have it as a 12"+15" or as a 2x15". If you want one of these versions, please add one or two 15" speakers to the cart and write 1215 or 215 in your order notes.

Here's the Celestion Fullback G15V-100 page - click here to add one (or two).

If you want a different tonal flavour we offer the full complement of Celestion twelves to customise your cab, including neo Creambacks to drop the weight to under or ultra high output Copperbacks for that clear tone with 500W of power handling for big amps.

Lots of 12" speakers here!

Specifications

Features

• Innovative internal design - Barefaced AVD enclosure for superior audibility, efficiency and power handling
• Low-cut filter toggle switch
• Choose from the entire range of Celestion 12" speakers. The iconic Celestion Vintage 30 fitted as standard.*
• Either a black or silver cloth grill with white piping.
• British Raging Green or Black in Black tolex.
• Top strap handle to tilt and roll, dual side strap handles to carry.
• Large rubber feet and tilt and roll wheels on base.
• Dual combi 1/4” + speakon sockets

*Additional customisation fee applies. See below.

Questions

Traditional guitar loudspeaker designs.

There are basically two sorts - closed-back and open-backed. Open-backed because they were combos and needed to keep the valves cool and accessible for servicing, closed-back and sealed because that’s how most speakers were made in the 1960s.

How does that affect using them?

The closed-back cabs have narrowing dispersion as frequency increases (a hi-fi speaker uses smaller speakers for higher frequencies to reduce this problem). The open-backed cabs fire sound out of the back as well as the front, so although the dispersion narrows from both front and back in much the same way as the closed-back cab, the sound coming out of the back helps fill the room with mids and highs - but that sound out of the back cancels out most of the lows (due to the inverted phase as the back of the speaker pulls when the front pushes and vice versa). In other words, open-back cabs are easier to hear around the room but the lows are thinner.

How is the Uprising 212V different?

From the front it behaves much like a closed or open-backed cab. But the mids and highs coming out of the AVD+ at the back are amplified and dispersed around the room whilst the lows are inverted to match the lows from the front, giving lots more bottom. Basically you get twice the output of a closed back cab with an identical speaker AND even better dispersion and audibility (and far far greater output) than an open-backed cab.

What is AVD?

You see it when you look at the back of the cab - it’s the Augmented Vent Diffractor. It’s a unique patented technology that we started developing back in 2013. At low frequencies it acts as a tuned vent or Helmholtz resonator, improving efficiency, power handling and output. At mid and high frequencies it acts to diffract, disperse and couple the sound with the room for improved audibility and output especially in rooms with poor acoustics.

What is the Lo Cut filter for?

The increased low frequency output from the AVD may be too much for some guitarists’ tastes - so you can flick this switch and remove lows at the cab. Doing so not only changes the bass response but also increases the power handling of the cab, lowers the distortion due to motor excursion and reduces the load on your amp’s output stage. This can give you two different sweet-spots of optimum speaker overdrive or break-up and two different sweet-spots of power valve overdrive. If your sound is perfect in rehearsal but too dirty at a louder gig then engaging the Lo Cut filer will clean it up.