The DB25b from Rolls is a transformer balanced, passive direct box. It features a ground lift switch for hum elimination, and a rotary attenuator for padding the input signal from -20 or -infinity dB. Padding the input signal provides a way to connect the unit to a line level signal or even a speaker level signal and connecting it to a balanced line level input on a mixer. The two 1/4" inputs are paralleled pass-throughs to also send the input signal to a tuner, pre amp, etc.
| Input Connections | 2 x 1/4" TS phone (unbalanced) |
| Output Connectors | 1 XLR |
| Input Impedance | 50kΩ |
| Maximum Output Level | +10 dBm |
| Output Impedance | 600Ω |
| Frequency Response | 20 Hz to 20 kHz, +/-3 dB |
| Power Requirement | Passive |
| Dimensions (WxDxH) | 4.5 x 2 x 1.6" (114 x 51 x 41 mm) |
| Weight | 8 oz (23 g) |
| Specialties | Ground lift switch for "hum" reduction |