Many players prefer to raise their combo amp up off of the floor, and a dedicated amp stand is often more convenient and stable way to do this versus using a chair. There are several reasons to raise a guitar amp off the floor:
1. When placed on the floor, the amp will “couple” with the surface, boosting low frequencies. When miking the amp for recording or sound reinforcement, that boosted low end can create problems.
2. The amp will disperse its sound into the room better if it is raised up.
3. You’ll hear the amp better (as the player) when it is closer to your ears — most peoples’ ears are on their head, not their ankles.
Various types of amp stands are available, including tilt-back designs to aim the amp at the player’s ears, different heights, stands built into amp cases, and more. A tilt-back stand can work very well for solving the problem of an onstage amp blasting the FOH sound man and throwing off his or her mix, as well as cut down on the amp blast overwhelming the first few rows of audience members.