Dod AC 260 User Manual

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 indi­vidualized 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.

XLR

12

3

600Ω CT 50KΩ

1/4"

Hi Z

Block Diagram AC260

Specifications of the AC 260

Low Impedance In/Output: 600 ohms center tapped
(balanced).

Low Impedance Connector: XLR type jack.
High Impedance In/Outputs: 50KΩ.
High Impedance Connectors: 2- 1/4” mono phone
jacks

AC 265 Direct Box

Features of the AC 265

• Connects high impedance (50K ohms) to low imped­ance (600 ohms), or low impedance to high imped-

ance.

• Ground lift switch to fix ground-loop hum problems.

• Allows a hi impedance unbalanced source to directly
feed a low impedance balanced input.

• Low distortion

• Low noise

• Adjustable attenuation pad, makes this different from
the AC 260.

Operation of the AC 265

• Connect the output of the high impedance source to
the input of the AC 265.

• Connect the low impedance output of the AC 265 to a

mixing console or other low impedance input.
Connect the unbalanced 1/4” tip-sleeve output to a
high impedance input (if desired) .

• Set the ground lift switch to the position with the least
amount of hum or noise.

47K

50K

4.7K

470Ω

WHT GRN

BLUORG

XLR

GND LIFT

YEL

Block Diagram AC265

Specifications of the AC 265

Low Impedance In/Output: 600 ohms center tapped
(balanced).
Low Impedance Connector: XLR type jack
High Impedance In/Outputs: 50K ohms (unbalanced)
High Impedance Connectors: 2 -1/4 inch mono phone
jacks.
Attenuation Range Switch: 0,12,40 dB attenuation
Frequency Response: 60 to 15 kHz, ±3 dB

AC 275 Active Direct Box

Features of the AC 275

• Allows a hi impedance unbalanced source to directly
feed a low impedance balanced input.

• Connects guitar pickups, microphones or electric
instruments to a recording or P.A. console without
audio quality loss.

• Input signal isolation using FET input operational
amplifiers that reduce loading effects normally found

600Ω