207d
instruction Manual
Aphex Systems Ltd. Model 207D
Page 8
207d
2-ch tube mic preamp with adc
Page 9
Aphex Systems Ltd. Model 207D
MIC INPUT
DO NOT feed
mic inputs
PROTECTED UNDER
US PATENT
5,450,038
APHEX AND MICLIM
ARE REGISTERED
TRADEMARKS OF
APHEX SYSTEMS LTD.
OUTPUTS
INSERT
CHANNEL 2
-10 +4
Pin1 = Sleeve = GND, Pin 2 = Tip = HI, Pin 3 = Ring = LO
OPERATING
LEVEL
MIC INPUT
DO NOT feed
mic inputs
OUTPUTS
INSERT
CHANNEL 1
-10 +4
Pin1 = Sleeve = GND, Pin 2 = Tip = HI, Pin 3 = Ring = LO
OPERATING
LEVEL
100-240V 0.12-0.05A 50/60Hz
S Y S T E M S
|
AES3 OUT
SPDIF
CLOCK IN
MADE
IN
U.S.A.
MODEL 207D 2 CHANNEL MIC PRE 24/96
3.0 Installation & Interfacing
3.4 MIC INPUT CONNECTIONS
The MICROPHONE input connectors are located on
the rear panel. They are the standard XLR-3F type.
Use only properly wired balanced mic cables.
CAUTION: Beware that 48 volt PHANTOM POWER
may be applied to either or both of the micro-
phone inputs, creating a potential shock hazard.
Standard practice dictates shutting off the phan-
tom power before plugging or unplugging micro-
phones. Wait at least 10 seconds for the voltage
to fall sufficiently. This is not only for safety, but
for protection of sensitive microphones against
power inrush.
3.5 INSTRUMENT INPUTS
The INSTRUMENT inputs are located on the front
R
panel providing a high input impedance of 1
megohms. The instrument jack accepts standard
1/4” phone plug music instrument cords (i.e., guitar
cords). This input is also suitable for high imped-
ance microphones having cables with 1/4” phone
plugs. The do-it-yourselfer can refer to appendix D
for numerous examples of proper cable and plug
wiring.
3.6 INSERT JACK
The Model 207D allows you to insert additional
signal processing between the mic preamp’s front
end stage and the tube output stage. This is clearly
shown in the 207D’s block diagram at left. The inter-
connect is unbalanced by way of a stereo (TRS) I/O
jack on the rear panel. You will need a conventional
“Y” cable to interface with external equipment. Such
cables are available commercially. Make sure you
have the correct cable: tip is send, ring is receive, and
sleeve is ground. Check the following chart. Nominal
level is -10dBV.
3.7 OUTPUT CONNECTORS
The output connectors are located on the rear panel.
There are two output connectors per channel, one
1/4” TRS phone type and one XLR-3M type. They
3.1 INSTALLATION
The Model 207D occupies a single rack space (45mm or 1-3/4 inches) of a standard EIA equipment rack.
When rack mounting, use appropriate cushioned rack screws. Never restrict air flow through the device’s vents.
When installing the units into a rack, distribute the units evenly. Otherwise, hazardous conditions may be cre-
ated by an uneven weight distribution. Connect the unit only to a properly rated supply circuit. Reliable earth-
ing (grounding) of rack mounted equipment should be maintained. Try not to position the 204 directly above
devices that generate excessive heat such as power amplifiers (unless adequately ventilated) or near equipment
with heavy transformer hum fields.
3.2 REAR PANEL VIEW
3.3 AC LINE CONNECTION
Use only a power cord that carries approvals for use in your location. The 207D’s internal power supply is
designed to operate from all nominal power sources from 100 to 240 volts a.c. at 50/60Hz without requiring
the user to change any settings. In case of failure, do not attempt to change the internal fuse because it will
never blow unless the power supply fails catastrophically. The power supply will need to be serviced by a com-
petent service technician in such a case.
PROPER MICROPHONE CABLE WIRING
Female XLR
Male XLR