20-watt, 1 x 8" Bass Combo Amplifier with COSM Modeling and Built-in Effects
Roland CUBE-20XL BASS image 1
Roland CUBE-20XL BASS image 1
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This Tiny Bass Amp Packs Serious XL Tone!

Here's something any bass player can appreciate. The latest generation of Roland CUBE BASS amps is larger, louder, and more impressive than ever. Roland calls this the XL treatment, but at Sweetwater we call it just plain amazing! At under 21 lbs., the ultra-portable CUBE-20XL BASS combo amp packs most of the top-of-the-line XL series features into one of Roland's most portable bass amp designs yet. In addition to six fantastic COSM amp models, the CUBE-20XL BASS comes loaded with seven studio- and stage-ready effects, such as drive and poly octave, so you can get really creative. Single-knob compression and drive control gives your tone an edge - this 20-watt amp packs serious punch! Luckily, Roland also includes a power squeezer function, which let you get wide-open and punchy sound at a volume that's perfect for solo sessions.

Roland CUBE-20XL BASS Combo Bass Amplifier Features at a Glance:
  • 20-watt power output
  • 1 x 8" speaker
  • Power squeezer switch maintains tone while dropping output volume
  • 6 COSM bass amp models including SUPER FLAT, FLIP TOP, B MAN, BASS360, SESSION, and CONCERT 810
  • 7 effects including chorus, poly octave, delay, and reverb types
  • Single-knob compression and drive and 3-band EQ for added tone control
  • Onboard tuner
  • Solo mode with memory recall
  • 1 x 1/4" bass input jack, 1 x 1/8" stereo aux input jack, and 1 x 1/4" TRS footswitch input jack for controlling EFX/solo functions (compatible with BOSS FS-5U and FS-6 footswitches)
  • 1 x 1/4" headphones/recording output
If you're looking for the perfect on-the-go bass combo amp, pick up a Roland Roland CUBE-20XL BASS!

Additional Media

Bass Guitar Amp Buying Guide

Tech Specs

Type Solid State
Number of Channels 1
Total Power 20W
Speakers 1 x 8"
Effects Yes
Compression Yes
EQ 3-band
Amp Modeling Yes
Number of Models 6
Inputs 1 x Instrument, 1 x Aux
Outputs 1 x 1/4" (Headphones)
Footswitch I/O Yes
Height 13.19"
Width 13.19"
Depth 12.88"
Weight 20.72 lbs.
Manufacturer Part Number CB-20XL

Customer Reviews

Based on 12 reviews
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Great practice amp

Bought this for my son who is on his second year of bass lessons.He loves the modeling aspect of the amplifier as they allow the tonal flexibility to sound like many recordings in the past. All the effects are fine for what they are; do not expect to mimic $ pedals and you will be pleased. The Power Squeezer feature allows him to practice at night without waking his sister next door while maintaining the sound quality of the amplifier. It would be hard to do better for a practice amplifier with the flexibility to give you different tonal options for different styles of music.

It's sooooooo good!

I got this nifty little amp as a more portable practice amp and to have 2 bass amps in the house, one for me and one for my song (who is just picking up the bass). I tried it in the store and got a lot of help from my sales engineer, Bart Amburn (amazing dude, btw!). After 6 days, I gotta tell ya- this amp is amazing! So many features packed into a small, affordable package, such BIG sound for a small amp, and at 23 lbs., easy to cart around. I'm going to make it my main amp and leave the 100-watt Peavy (MAX110, also a good amp) for my son (who will just be practicing at home). The amp modeling is great, and well-documented, so you know what you're getting. Maybe the coolest feature is the Power Squeezer- taking the amp from 20 watts to 2 watts, but without any loss of tone or bottom end, even using all the effects. And still, this thing rocks at 2 watts! FYI- Bart helped me find a footswitch by Behringer that works very well with this amp at a GREAT price. The *only* thing I think it could use is a line out, but that's a small quibble and doesn't take off the grade I gave it.

Good little amp

Here is a nice little amp. I needed something I could easily haul to friends' houses to match with low wattage tube amps on guitar and this fits the bill. It's very portable compared to a 2 x 15 and also has a lot of useful effects built in. Pretty much everything on my pedalboard is built in on the amp. I have played bass for about a decade, I'm a reformed guitarist, and guitar for over a decade before that so I know a little bit about a thing or two. The frequency response on the amp is very good and very even tonally across a four string bass. There is not a ton of bass but enough to get your point across. I'll go to the 2x15 to really move some bass. Overall, a really nice little amp. Great for apartment dwellers and low key jam sessions/ practice sessions.

Great Amplifier!

Great tones. Wonderful amp. The headphones/recording out sends a very strong signal to the ears/interface, respectively. I LOVE THIS AMPLIFIER! Well done, Roland. Super.
Music background: Solo recording artist/multi-instrumentalist/sound engineer

Small but good

I really love this amp. Its for my home office so its a small space and I did not want to take up a lot of room for an amp. I have an old Crate BX-40 40w amp with a 10" speaker down in the den and this little 20w 8" blows it away! I never thought I could get this kind of sound out of a such small speaker. I have no idea how it would work in a gig but as a practice amp its everything I want and with the sound that keeps me going.

Sweetwater Advice

Nick Church

For bass players just starting out with the instrument, or for more experienced players looking for a really compact practice amp that still provides good tone, the newly upgraded Roland Cube XL Bass series of bass combo amps really deliver! This Cube-20XL Bass generates sounds way beyond its small size. Including six of their COSM bass amp models, Roland have designed them so that the tone stack changes its 'voicing' depending on which amp you use - a really clever trick! Seven very useful built-in effects make carrying extra pedals around unnecessary. Although it won't quite get to wall-shaking volumes, this little beast is perfect for practice or playing with unamplified acoustic instruments.
See also: Bass Combo Amps, Roland, Roland Bass Guitar Combo Amps