I've had my Crown D75 for about seven or eight years. It came into my hands in an unlikely fashion and I have been using it in a variety of ways since I got it. It is a compact dual channel power amplifier, good for power monitors that may be unpowered, or for using it as an head for a bass or guitar cabinet. It has both XLR and 1/4 inch outputs to send to a cabinet or speakers and it also has connections for speaker wire. In the front of it there is a headphone jack and a power switch. It then has a volume knob for each channel with green and red LEDs to show output level and overloading. I have used this amplifier successfully in a few ways. Right now I am using it to power a pair of Yamaha NS-10M studio monitors and it works flawlessly for this. In the past I have used it as a bass and guitar head by plugging my instrument into it and sending the amp to a speaker cabinet. While I didn't get as much juice out of it in this application that I would have liked, it did the job. I used it for mostly bass guitar as this worked much better than guitar. However, this unit is probably really designed to power studio speakers, and works best in this application. The price won't make you dig too deep, and I'm not sure you can find too many of these around, but if you can find one and need a compact power amplifier for your monitors, I definitely recommend it! While not extremely versatile in its use by any means, what it does do, it does it well and has a pretty good amount of power for a single rack unit.