Bass Amp Heads

We don't recommend it. The whole point of playing bass is to provide a large, confident low end. Much of that low end will be lost if you play through a guitar amp since guitar amps are aimed far more at the mid frequencies than the bass ones. While certain genres support the use of mixed cabinets (a guitar cab and a bass cab used together) for electric guitars, there is no particular stylistic benefit to doing this with bass. Having said that, progress is made through experimentation so by all means try it out! Just be careful to work out ohmage and so on so you don't damage yourself or your gear.