a keyboard amp can make a lot of sense for additional monitoring in small clubs that don’t have proper monitor systems. but for seriously amplifying your synth or drum machine to the front they are useless. they just lack the bottom for kicks and anything that is more than just texture…

even very small clubs mostly have subs that’s why i highly recommend getting yourself a proper active sub for your rehearsals instead of just a keyboard amp. otherwise you can never tell how your arrangements really work out in a live situation when you have other instruments involved. you may have a pad with way too much bottom that causes an earthquake in a venue but you never noticed because you never ran the synth through a sub before. or it may be the other way round that you think you have a really hard hitting kick going on, but live it turns out that it don’t move any air at all. it even makes sense to have a portable active sub for small shows, because this is where small systems mostly lack. a lot of times in small rock clubs these systems only amplify vocals and have no subs at all.