INTRODUCTION
Congratulations on your purchase of an APEX ADP2 Passive Direct Box. This sturdy and dependable
unit allows you to connect the output of an electronic musical instrument or other audio source to the
balanced input on a mixer. Alternatively, the APEX ADP2 allows connection of an audio source to an
instrument amplifier while simultaneously patching it to a channel on a mixer. It even gives you the
ability to connect the speaker output of an instrument amplifier directly to the input of a mixer - espe-
cially desirable in the case of a tube guitar amp (speakers must also be connected, see below).
FEATURES
The APEX ADP2 includes the following features:
1. Switchable input attenuation
• 0dB for electric guitar/bass pickups
• -20dB for line level signals, such as CD-Players and keyboards
• -40dB for speaker feeds
2.
50 kOhm Instrument input. The APEX ADP2 matches the signal level and impedance with unity
gain without adverse effects on the source signal.
3.
The 50 kOhm Parallel Link jack output enables you to connect output from the D.I. Box directly
to power amplifiers without a separate preamplifier.
4. The 600 ohm XLR output jack enables you to send a balanced signal to the mixing console.
5. A Switchable Ground Lift is provided to help eliminate hum caused by ground loops.
APPLICATIONS
1. Electric Guitar/Bass Pick-Up Signals
The high impedance signal from a guitar or bass pick-up is translated by the APEX ADP2 into a low
impedance balanced signal required by mixing consoles.
• Suggested attenuation setting (1): 0dB
2. Keyboards - Line Level Signals
The APEXADP2 automatically balances and matches the line level outputs of modern electronic key-
boards. If you are using a multiple keyboard setup with your keyboards plugged into an instrument
amplifier, simply connect the line output of the instrument amplifier to the APEXADP2 with an unbal-
anced patch cable, then use a balanced patch cable to go to a channel on the mixer.
• Suggested attenuation setting (1): -20dB (line level) or -40dB (amp level)
3. DJ Console Output Signals
DJ Mixers often supply only an unbalanced -10dB signal. The APEX ADP21 converts this signal to a
balanced line level before it reaches the house console, while providing a convenient method of con-
nector transition with long cable run capability.
• Suggested attenuation setting (1): 0dB or -20dB
4. Speaker Level Signals
The ADP2's capability of accepting speaker level input from an amplifier's output allows post-amplifi-
er, post EQ/effects signals to be fed directly to the console. This is particularly desirable where a
tube guitar amp is concerned. CAUTION; If you are connecting a "tube" amplifier's speaker output
this way, BE SURE A SPEAKER LOAD IS ALSO CONNECTED. Tube amps must see a load
impedance that falls within their design parameters. Because it has a very high input impedance,
connecting the ADP2 in parallel with a speaker load will not alter the overall speaker load impedance
encountered by the amplifier.
• Suggested attenuation setting (1): -40dB
GROUND
LIFT
GND
F
ROM
I
NSTRUMENT
50 kOhms
I
N /
T
HRU
50 kOhms
T
O
M
IXER
600 Ohms
-40 db
0 db
D
IRECT
B
OX
ADP
2
-20 db
IN
ATT
GND
LIFT
3
2
1
LOW
IMP
HI
IMP
IN / THRU
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SPECIFICATIONS
Attenuation Switch,
three-position
0dB, -20dB, -40dB
Frequency Range
15Hz-30kHz +/- 0dB
Inputs
50 kOhm ¼" TRS*
phone jack
600 ohm XLR
Outputs
50 kOhm ¼ inch TRS
phone jack, parallel link
600 ohm
balanced XLR
Dimensions (WDH)
3.75 x 1.5 x 2.9 inches
95 mm x 40 mm x 73 mm
Weight
313g, 0.69 lb
* NOTE: ¼ inch TRS phone
jack pin configuration
Tip = (+) 0° / Ring = 180° /
Sleeve = (-) Ground.
www.ApexElectronics.com
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