The DB25 is a transformer-balanced, passive direct box. The Attenuator cuts the signal from speaker outputs, or hot line outputs so the audio mixer input does not distort. The 1/4 in. Input jacks are paralleled so either one may be used.
This direct box converts high-impedance to low-impedance and vice cersa. It has a ground lift for hum reduction, and an attenuator switch for connection to line level or speaker level signals.
Technical Info
Frequency Response: 50 - 15K Hz + -3 dB
Output Impedance: 600 ohms
Imput Impedance: 50K ohms
Max output level: 10 dBm
Polarity: + Pin 2 (XLR)
Here's a direct box from Rolls that offers passive operation for easy use when a power supply would just get in the way. It also features a -20 or -40 dB pad and a ground lift switch.