If you're looking for a full rehearsal audio solution, The Anchor Audio
MegaVox Packages are the best (and most affordable) options.
The Anchor Audio Heavy Duty Speaker Stand is an easy way to get your speakers up off of the ground. This is especially important if you're looking to get more sound coverage on the marching field or in the parking lot, as getting the sound to start from a higher location can help it reach all the way up to the front of the field.
Anchor Audio speakers come with a hole molded into the bottom of each speaker that makes mounting them on these stands really simple. Just pick it up and put it back down on the speaker!>
The stands are easy to adjust, fully collapsible down to a height of 38", with a top height of 79", and they are built to withstand being beat up on the road.