Blackstar Unity U250ACT 250-Watt 1 x 15 inch Active Bass Extension Cabinet
The U250ACT is the powered cabinet for the Unity Bass Series. It is not a passive box you hang off the back of a combo: it brings its own 250 watts and its own volume control, so you are adding power and cone area at the same time. A custom designed Eminence Opus 15-inch speaker does the work.
- 250 watts of its own power: a genuine step up in output from a Unity Bass combo.
- Custom Eminence Opus speaker: classic 15-inch low end muscle.
- Independent volume control: balance the cabinet against the combo without guesswork.
- XLR combo input: run the cabinet from an external preamp instead of a Unity combo.
- Passive 1/4 inch input: use it as a conventional extension cabinet when you want to.
- XLR Thru: chain several cabinets together to build a larger rig.
If you want more out of a Blackstar Unity Bass Series combo, the U250ACT is the cabinet built for the job. It is an active 1 x 15 inch cabinet with 250 watts of its own, so plugging it in adds real output rather than just splitting what the combo already produces.
The speaker and the volume control
A custom designed Eminence Opus speaker supplies classic low end muscle in the size bass players have trusted for decades. An independent volume control on the cabinet makes balancing levels between the combo and the extension straightforward, which is the difference between a rig that sits right on stage and one that fights itself.
Three ways to feed it
The XLR combo input means the U250ACT will run from an external preamp, so it is useful beyond the Unity range. A passive 1/4 inch input lets it work as a standard extension cabinet. And the XLR Thru allows several cabinets to be chained together when a stage really calls for it.
Where it sits in the Unity Bass Series
The Unity Bass Series was built for tonal flexibility. The 250 and 500 watt combos let you switch between three power amp stages using Blackstar's Response control to shape compression, natural drive and dynamics, and every combo offers three preamp voicings and a 3-band EQ, with onboard effects to add punch and depth. The U250ACT is how you take that sound to a volume the room can feel.