I bought this miniDSP 4x10 HD to use for a speaker building project that I never got around to working on. I used it as a crossover for my sub in a 2.1 setup, as well as for room correction, and was impressed with the level of control.

From the manufacturer:

miniDSP 4x10 HD is a versatile multi-channel Digital Signal Processor (DSP) for analog and digital audio sources. Combining high quality audio algo- rithms along with a flexible graphical user interface, the 4x10 HD can be used for multi-way speaker processing or multi-channel equalization. With its balanced & un-balanced audio I/O, the platform easily fits the needs of most audio systems. The sturdy powder coated steel enclosure, brushed aluminum front panel and removable rack ears is a perfect match for both consumer (Home AV) or commercial (ProAV) applications.

On the processing side, the platform ranks high on versatility thanks to our unique product concept of audio plug-ins. The unit is easily configured on Mac/PC machines from a responsive and intuitive Graphic User Interface. Once the unit is programmed, control of presets, master volume and digital source selection can be done via the front panel encoder or Infrared (I.R) re- ceiver without the use of a computer.

Finally, the miniDSP experience isn’t just another audio product. It’s about joining the ranks of a large audio community with fully integrated tools and extensive application notes. At miniDSP, we value partnerships and the com- plete integration of our products with well known platforms such as Room EQ Wizard (REW) software is yet another step to provide fully integrated solutions to our customers.