integrated amplifier. has volume control. just has no radio or any kind of built in audio source. with this one you still need an external source, but lets face it, nobody wants to listen to the actual radio in a gym. anything with a 3.5mm output will plug into this amp and provide the audio. so, add in a sirius radio, or even an old cell phone with pandora installed and connected to the wifi. many options to be had.
there is a reason they make commercial grade audio equipment. home audio is just that: home audio. they are both made for specific reasons and types of areas/uses. Same thing goes with car audio, I'm not sure about you guys, but I have no intention of ever putting a home audio amp into my car, I'll buy a car amp. For a commercial use, one that will be used for hours and hours for 5 to 7 days a week, 52 weeks a year, I'll invest the money (although we are running around the same cost) to get something that is designed for that kind of abuse.