Exactly. A double bass (provided you have a decent pickup system) should benefit from the the clean and uncoloured sound of a good quality PA speaker. A bass guitar not so much, I feel. At home, I've played about with running my bass through my PA (Fohhn LX150 tops and XS22 subs - 1.5kw and like a big hi-fi. Wonderful for vocals and acoustic instruments), using a Lehle Basswitch preamp. So I'm certainly not cheaping out or using budget DJ gear. It sounds super clean, but also a little sterile. Maybe I'm just too used to the built in character/sound of bass amps, but I don't feel it would work that well in a band context.