Radial J+4 vic-firth The Radial SB-1 Acoustic is

The Radial SB-1 Acoustic is a high-performance active direct box made for players that are on the move

or any other MONO designs

you can combine two 9V outputs from your power brick and the Tailbone will convert them to 15VDC and provide the correct voltage polarity

ideal balance of tone and playability

Gauges: 50

Radial J+4 vic-firth The Radial SB-1 Acoustic isStereo preamp boosts signals to +4dB balanced line level Increases gain for low output instruments & music players Transformer isolated to eliminate noise caused by ground loops Plenty of connector options Plug and play easy to use The Radial J+4 is a stereo interface designed to accept unbalanced low output level devices such as instruments, computers or CD players and boost the signal to a balanced +4dB level for easy manipulation in professional