Biamp DP-M28 User Manual
ADVANTAGE DP/M 28
Distribution Preamplifier/Mixer
Operation Manual
Biamp Systems, 14130 N.W. Science Park, Portland, Oregon 97229 U.S.A. (503) 641-7287
an affiliate of Rauland-Borg Corp.
ABLE OF CONTENTS
T
Front Panel
Rear Panel
Modifications/Accessories
Block Diagram
Specifications
Warranty
pg. 2
pg. 3
pgs. 4 & 5
pg. 6
pg. 7
ADVANTAGE DP/M 28
INTRODUCTION
The ADVANTAGE DP/M 28 is a single rack space unit, which combines a two channel
mic/line mixer with an eight output distribution preamplifier. Both input channels accept
either mic or line level signals, and provide phantom powering for condenser
microphones, and patch points for insertion of external signal processing equipment. All
outputs are electronically balanced line level outputs with 600 ohm drive capability. A
rear panel "mode" switch allows the ADVANTAGE DP/M 28 to function either as one 2x8
mixer/distribution preamplifier...OR...as two independent 1x4 distribution preamplifiers.
ADVANTAGE DP/M 28 features include:
♦ two electronically balanced, low-noise, differential mic/line inputs
♦ 30dB pad switch and 50dB trim control on each input channel
♦ peak indicator on each input channel
♦ patch point on each input channel, for insertion of external signal processing
♦ +12 Volt Phantom Power assignable on each input channel (+48 Volt optional)
♦ eight electronically balanced & floating outputs with 600 ohm drive capability
♦ rear panel "mode" switch with front panel indicator (one 2x8...or...two 1x4 operation)
♦ screwdriver adjustable input trim and output level controls with security plugs
♦ input and output connections on barrier strip
♦ optional transformers for inputs or outputs
♦ covered by Advantage Five-Year 'Gold Seal' Warranty
♦ UL listed power source
After reading this manual, if you have any questions or need technical assistance, please
call Biamp Systems toll-free at 1-800-826-1457.
1
FRONT PANEL
(1) (4) (5)
peak
inputs
peak
A outputs
combined
B outputs
ADVANTAGE DP/M 28
Distribution Preamp/Mixer
on
trim
A
trim
B
level
A1
level
A2
level
A3
level level
A4
level level
B2 B3B1
level
B4
(2) (3) (6)
(1) Peak Indicator (Inputs A & B): These two red LEDs indicate signal levels in the respective input channels have reached +15dB (3dB
below clipping). For best performance, adjust the associated Trim controls (2) so the Peak indicators flash only on occasional peaks in
signal level (see Rear Panel: Pad on page 3).
(2) Trim (Inputs A & B): These two screwdriver adjustable controls provide 50dB of gain adjustment for the respective input channels.
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. Use the
Level controls individually to set the desired signal level for each sound system or device being fed. The range of these controls is from
"off" (fully counter-clockwise) to a maximum of 6dB of gain (fully clockwise). Level controls are factory set to "off". Once the Level controls
are adjusted, the front panel access holes may be plugged to prevent tampering (security plugs included as an accessory item).
(4) Combined Indicator: This red LED indicates when the DP/M 28 is operating in the "combined" mode (see Rear Panel: Mode Switch
on page 3). When the Combined Indicator is lit, signals from both input channels are mixed together and sent to all eight outputs. In this
mode the DP/M 28 functions as a combination mixer/distribution preamplifier, with 2 inputs and eight outputs. When the Combined
Indicator is not lit, 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.
(5) On Indicator: This red LED indicates when the Power Switch (6) is turned on and power is applied to the unit.
(6) Power Switch: This switch turns the DP/M 28 on. If the On Indicator fails to light and the unit does not pass signal properly, turn the
Power Switch off, disconnect the power cord from the AC outlet, and check/replace the AC fuses (see Rear Panel: AC Power Cord on
page 3). If the AC fuses are intact, check the power connections (and possibly another AC outlet). If the problem still exists, the unit may
require service.
2
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