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Introduction
Congratulations, and thank you for your purchase of
the DOD direct box. The AC 260,265,275, and 285 all
solve distortion problems normally associated with
using high impedance sources with low impedance
inputs. The product line begins with the AC 260 which
is a basic easy to use direct box and progresses into
the AC 285 with a cabinet emulator. The features,
operation, and specifications literature have been indi-
vidualized for each box. Determine which box you
have and consult the following text until you reach the
section that is specific to your box.
AC 260 Direct Box
Features of the AC 260
• Allows a hi impedance unbalanced source to directly
feed a low impedance balanced input.
• Low distortion
• Low noise
• Rugged metal chassis
Operation of the AC 260
• Connect the output of the high impedance source to
the input of the AC260.
• Connect the low impedance output of the AC260 to a
mixing console or other low impedance input.
Connect the unbalanced 1/4" tip-sleeve output to a
high impedance input.

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Summarization of Contents

AC 260 Direct Box
Features of the AC 260
Lists key features: hi impedance unbalanced source to balanced input, low distortion, low noise, rugged chassis.
Operation of the AC 260
Details connection steps: high impedance source to input, low impedance output to console, unbalanced output to high impedance.
Specifications of the AC 260
Outlines low impedance in/output (XLR), high impedance in/outputs (1/4"), and impedance values.
AC 265 Direct Box
Features of the AC 265
Highlights impedance matching, ground lift, low distortion, low noise, and adjustable attenuation pad.
Operation of the AC 265
Explains connection procedure and ground lift switch usage for fixing hum or noise.
Specifications of the AC 265
Details impedance, connector types, attenuation range (0,12,40 dB), and frequency response.
AC 275 Active Direct Box
Features of the AC 275
Describes features like impedance matching, connecting instruments, signal isolation, and FET amplifiers.
Operation of the AC 275
Covers connection, ground lift, pad switch, and power selector settings for optimal use.
AC 285
Features of the AC 285
Details features: impedance matching, instrument connection, signal isolation, FET amplifiers, and cabinet emulation.
Operation of the AC 285
Explains connection, ground lift, pad switch, power selector, and speaker settings for desired sound.
Specifications of the AC 285
Lists frequency response, gain, impedance, power requirements, THD, S/N ratio, and max input level.