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 |
600 CT |
50K |
1/4" |
|
|
|
Hi Z
1 2
3
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 imped-
ance (600 ohms), or low impedance to high impedance.
•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 |
ORG |
BLU |
|
|
|
|
GND LIFT XLR |
50K |
|
YEL |
600 |
|
|
||
4.7K |
470 |
|
|
|
WHT |
GRN |
|
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
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