I bought this mini speaker to plug a amPlug bass itself connected to a low Cort A4. Result: it enormously breath. In passive bass mode, you hear nothing (really nothing but). In low active fashion, it makes more than the most dirty dirty overdrive (except when playing on upper strings). Maybe it sends with a guitar, but with a low, it is useless as the sound is awful (unless voluntarily seek its dirty and playing soft mediator). Besides mine has a slight play at the jack input, which generates even bigger breaths when moving the cable. However, I drew attention to the fact that I have not tried with another amPlug than mine (mine is perhaps "Daubé" since he did not sensational sound quality when used with the headset).
In short: to try before you buy but do not expect a miracle!
