DB Series Direct Boxes
Not every instrument is made to connect directly to a mixer. Guitars and basses have
a lower output signal level, and their output is not balanced. If you plug them straight into
a mixer, you have to jack the preamp level to the max just to get a quiet, wimpy sound.
Most keyboards have unbalanced outputs, which means if you try to use long cables,
they can pick up all sorts of noise. Direct Injection Boxes solve these and other sticky
studio and live difficulties.
DB Series common features
The DB Series direct boxes convert unbalanced line-level signals to balanced mic-level
output and provide signal and impedance matching for the direct connection of instruments
like guitars, basses and keyboards to amplifiers and mixers. This lets you use send your
instrument signal through long cables or audio snakes without picking up interference and
without high-frequency loss. A 1/4″ Input jack is provided for connecting instrument or
speaker-level signals, and a separate 1/4″ Thru jack allows the unbalanced signal to be
sent to an onstage amplifier while the balanced signal is sent to a mixer. A ground Lift
switch helps eliminate hum and buzz problems in musical instrument hookups.
The DB-1A is an Active direct box that can be powered either internally by two 9-volt batteries
or externally by phantom power from a mixer. It also features:
INPUT – Connect the signal source to this 1/4″ unbalanced TS jack.
POWER LED – Indicates when the battery or Phantom power is applied.
THRU – This 1/4″ input lets you connect an instrument to an amplifier onstage.
PKUP/LINE ? Lets you optimize for instruments like guitars and basses or keyboards
SPKR ? Configures input to accept speaker level outputs, from a guitar amp for example.
GND/LIFT ? Helps to eliminate buzz and hum due to ground loops in the sound system.
OUTPUT – This balanced XLR jack provides a low-impedance mic-level signal for connecting to
a microphone input on a mixer. If the mixer has phantom power, it can be used to
power the DB-1A, which automatically switches power away to save battery life.
100 Hz ? 20 kHz (+/? 0.05 dBm)
20 Hz ? 20 kHz (+/? 0.80 dBm)
Maximum Input Level:
Pickup: +8 dBm
Line: +15 dBm
Speaker: +35 dBm
Pickup: 10M ohm
Line: 10M ohm
Speaker: 11k ohm
Pickup: ?8 dBm
Line: ?28 dBm
Speaker: ?48 dBm
Pickup: ?106 dBm
Line: ?109 dBm
Speaker: ?109 dBm
Signal-to-Noise Ratio (with 15 dB headroom):
Pickup: ?99 dB
Line: ?109 dB
Speaker: ?89 dB
Rise Time: 1 microsecond, no overshoot
THD + Noise: 0.01%
Output Impedance: 200 ohms
Power Requirements: 48 V phantom power or two 9 V batteries
Battery Life: 300 hours
Current Draw: < 7 mA DC
Height: 2.0 in/51 mm
Width: 4.3 in/109 mm
Depth: 4.0 in/102 mm
Weight: 14 oz/ 0.40 Κgr.