CTL28 is a custom cab design for Electric upright bass (and to support an acoustic double bass) with a 200 watt amplifier built in. (We used the GK MB200 amplifier as it has a input sensitivity switch so it works with both high and low output pickups). The cabinet can also be driven by external amplification up to 400 watts. It features a very deep sound and can also be used outdoors. One of the features of this amp is that it does not easily excite the natural resonances of the acoustic upright so it is less prone to feedback.
CTL23 is a custom miniature design, similar to CTL3 but specifically for upright and electric upright basses. It features two full range long throw 3 inch cones. Ideal for practice or acoustic jams.