User manual BIAMP DP/M28

[. . . ] Use the Trim controls to compensate for various input signal levels. For best performance, adjust these controls so the associated Peak indicators flash only on occasional peaks in signal level (see Rear Panel: Pad on page 3). Once the Trim controls are adjusted, the front panel access holes may be plugged to prevent tampering (Security Plugs included as an accessory item). (3) Level (Outputs A & B): These eight screwdriver adjustable controls provide level adjustment for the respective outputs. [. . . ] When the Mode switch is released (A & B Separate), signal from Input A is sent only to the A Outputs and signal from Input B is sent only to the B Outputs. In this mode the DP/M 28 functions as two independent distribution preamplifiers, each with one input and four outputs. The Combined Indicator on the front panel shows the status of the Mode switch. (5) Patch (A & B): These 3-conductor 1/4" phone jacks are for connection of external signal processing devices to the respective input channels. Patch jacks are wired with Tip as send (output), Ring as return (input), and Sleeve as ground (common). Special "Patch" cables are required, which allow signal to leave the channel, be processed, and then return to the channel (see Modifications/Accessories: Patch Cables on page 5). Patch jacks may also be used to provide a direct output from each input channel. To accomplish this, without interrupting the input signal, connect to Patch with Tip & Ring as high (+) and Sleeve as ground (common). A standard 2-conductor 1/4" phone cable may be used to extract signal from Patch, however, this will interrupt the input signal before it reaches the output section. (6) Pad (A & B): When depressed, these switches reduce the signal levels at the respective input channels by 30dB. Use the Pad switches whenever signal levels at the associated input channels exceed the operating range of the front panel Trim controls. (7) Inputs (A & B): These barrier strip terminals provide two electronically balanced, differential inputs to the DP/M 28. The Inputs are for connection of signals from either microphones or line level devices, and are wired with high to (+), low to (-), and ground to (com). For unbalanced input, wire with high to (+) and ground to both (-) & (com). Phantom Power is assignable on each Input, for operation of condenser microphones (see Modifications/Accessories: +12 Volt Phantom Power on page 5). If +48 Volt Phantom Power is required, an external power supply is available from Biamp Systems as a user installed option (see Modifications/Accessories: +48 Volt Phantom Power on page 5). Input transformers are also available from Biamp Systems as a user installed option (see Modifications/Accessories: Input Transformers on page 5). 3 A PEAK B PEAK A1 LEVEL A2 LEVEL A3 LEVEL A4 LEVEL COMBINED B1 LEVEL B2 LEVEL B3 LEVEL B4 LEVEL POWER ON W61 W60 T100 L100 L101 L201 L301 L401 L501 L601 L701 L801 L200 L300 L400 L500 L600 L700 L800 T200 T300 T400 T500 T600 T700 T800 W21 W20 T20 T60 A PP B PHTM PWR INT J4 W101 W201 W301 W401 W501 W601 W701 W801 F1 F2 OFF J3 EXT 48V PHTM CIRCUIT BOARD PATCH CABLES T MODIFICATIONS/ACCESSORIES B S A T R S T S C T R S T R S EXT ON J21 J61 4 MODIFICATIONS/ACCESSORIES NOTE: Disconnect the power cord from the AC outlet. Remove the bottom panel to access the internal modifications. The circuit board diagram on page 4 shows the components as they appear when the unit is placed upside down, with the front panel facing away. When performing modifications which require soldering, it may be necessary to remove the top panel from the unit. +12 Volt Phantom Power: Near the left-rear corner of the DP/M 28, a movable jumper strap is provided for each input channel. Either or both of the input channels may be assigned Phantom Power by moving the respective jumpers, labelled PP (A/J21 for Input A, B/J61 for Input B), towards the front panel, to the ON position. An external +48 Volt Phantom Power supply is available as an option. [. . . ] EXCEPT AS EXPRESSLY PROVIDED HEREIN, BIAMP DISCLAIMS ALL OTHER LIABILITY TO PURCHASER OR ANY OTHER PERSONS ARISING OUT OF USE OR PERFORMANCE OF THE PRODUCT, INCLUDING LIABILITY FOR NEGLIGENCE OR STRICT LIABILITY IN TORT. THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED. BIAMP EXPRESSLY DISCLAIMS ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE REMEDIES SET FORTH HEREIN SHALL BE THE PURCHASER'S SOLE AND EXCLUSIVE REMEDIES WITH RESPECT TO ANY DEFECTIVE PRODUCT. [. . . ]