"Pro" is one of those words that, in the hands of a zealous advertising man, can be rendered nearly meaningless.
In a generic sense, the word simply means that a product has been designed to work for a living. That generally means rugged physical construction that can handle repetitive moving and bumps. It also means rugged electronic construction. You can plug in a shorted cable or horridly overdrive the amp without damaging it. It also means it meets certain electrical specifications and has connectors designed for use in a studio or sound reinforcement environment (balanced XLR inputs, etc.) It is often easily rack mounted in a standard 19" equipment rack. As noted, it may be fan cooled. Many of these "pro" features are simply irrelevant in a home environment.
Note that none of these factors indicate whether or not the amp sounds good. Many probably do and others don't. You need to audition any pro amp you are considering in the same fashion as any other amp. Listen to it. If you like the way it works in your system better than the alternatives in your budget range, then you have a good reason to buy it. Ain't much more complicated than that.
In a generic sense, the word simply means that a product has been designed to work for a living. That generally means rugged physical construction that can handle repetitive moving and bumps. It also means rugged electronic construction. You can plug in a shorted cable or horridly overdrive the amp without damaging it. It also means it meets certain electrical specifications and has connectors designed for use in a studio or sound reinforcement environment (balanced XLR inputs, etc.) It is often easily rack mounted in a standard 19" equipment rack. As noted, it may be fan cooled. Many of these "pro" features are simply irrelevant in a home environment.
Note that none of these factors indicate whether or not the amp sounds good. Many probably do and others don't. You need to audition any pro amp you are considering in the same fashion as any other amp. Listen to it. If you like the way it works in your system better than the alternatives in your budget range, then you have a good reason to buy it. Ain't much more complicated than that.