User manual DOD AC

[. . . ] 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. [. . . ] · 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. · Input signal isolation using FET input operational amplifiers that reduce loading effects normally found on passive direct boxes. · Operates with battery or phantom power. · Internal pad for speaker level input. Operation of the AC 275 · Connect the output of the high impedance source to the input of the AC275. · Connect the low impedance output of the AC275 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. · Set pad switch to INSTRUMENT for line level input sources or to SPEAKER for speaker level input sources. Set power selector switch to ON for battery power or to OFF for phantom power. NOTE: To preserve battery life, set power selector switch to OFF when AC275 is not in use. Phantom Power Unbalanced Hi-Z Input -12dB (INST) -40dB (SPKR) PAD Battery + Unbalanced Output Left Ground + - 3 2 Balanced Low-Z 1 Output Block Diagram AC275 Specifications of the AC 275 Frequency Response: 20Hz-20kHz, ±0. 5dB Gain: Inst: Spkr: Input Impedance: -12dBu -40dBu Instrument 1. 3M Speaker 10k Output Impedance: 200 Power Requirements: 9V battery or 15-48V phantom power Distortion(1kHz, Inst @-10dBV input): <0. 02% Signal-to-Noise Ratio (Inst @-10dBV input): Better than 86dB Maximum Input: Instrument Position: +7dBu (9V battery) +5dBu (15V phantom) +20dBu (48V phantom) Supply Current: 4mA (9V battery) 4mA (15V phantom) 8mA (48V phantom) Input Connector: 1/4" tip-sleeve Output Connector: XLR, 1/4" tip-sleeve Dimensions: 2. 5"x4. 5"x1. 5" Weight: 15oz (422g) Note: 0dBV=1. 0 Vrms; 0dBu=0. 775 Vrms AC 285 Features of the AC 285 · 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. · Input signal isolation using FET input operational amplifiers that reduce loading effects. [. . . ] Set power selector switch to ON for battery power or to OFF for phantom power. · Set speaker settings to FLAT if you want the directto-microphone sound. If you are seeking the guitarto-board sound, the 4x12 or COMBO settings are great. Phantom Power Unbalanced Hi-Z Input -12dB (INST) -40dB (SPKR) FLAT 4x12 COMBO PAD Battery + Unbalanced Output Left Ground + - 3 2 Balanced Low-Z 1 Output Block Diagram AC285 Specifications of the AC 285 Frequency Response: 20-18 kHz ±1dB 10-30 kHz ±3dB Gain: Instr: -12dB Spkr: -40dB Input Impedance: Inst: > 1 meg Spkr: >200 k Output Impedance: 200 Power Requirements: 9V Battery 15-48V Phantom 9V AC Adapter (DOD PS3) THD (1kHz, Inst @ 0dBu, 9V batt): <0. 08% Signal to Noise Ratio (Inst @ -10dBu, 9V): Flat: >86dB Spkr Emulation: >80dB Maximum Input Level (Inst): 7dBu (9V battery or adapter) 5dBu (15V Phantom) 20dBu (48V Phantom) Supply Current: 8 mA (9V battery) 16 mA (48V Phantom) DOD Electronics Corporation 8760 South Sandy Parkway Sandy, Utah 84070 Telephone (801) 566-8800 FAX (801) 566-7005 International Distribution 3 Overland Drive, Unit 4 Amherst, New Hampshire 03031 U. S. A. [. . . ]