Neve 1073DPX User manual

1073DPX
Dual Microphone Preamplifier & EQ
User Manual
527-406
Issue 1.0

Important Safety Instructions
For your own safety and for the protection of others,
please observe the following safety precautions:
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
5) WARNING: To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture
6) Clean only with dry cloth.
7) Do not block any ventilation openings.
8) Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including am-
plifiers) that produce heat.
9) Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the
point where they exit from the apparatus.
10) Unplug this apparatus during lightning storms or when unused for long periods of time.
11) Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged
in any way, such as when liquid has been spilled or objects have fallen into the apparatus, the apparatus has
been exposed to rain or moisture, does not operate normally, or has been dropped
AMS NEVE
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© 2015 AMS Neve Ltd own the copyright of all information and drawings contained in this manual which are not to be copied or reproduced by
any means or disclosed in part or whole to any third party without written permission.
As part of our policy of continual product improvement, we reserve the right to alter specifications without notice but with due regard to all current
legislation.
Disclaimer: The information in this manual has been carefully checked and is believed to be accurate at the time of publication. However, no
responsibility is taken by us for inaccuracies, errors or omissions nor any liability assumed for any loss or damage resulting either directly or
indirectly from use of the information contained within it.
Trademarks: All trademarks are the property of their respective owners and are hereby acknowledged.

1073DPX Channel Amplifier Introduction ............................................................................................. 4
Configuring the 1073DPX ..................................................................................................................... 4
Front Panel........................................................................................................................................... 5
Rear Panel ............................................................................................................................................ 7
Rack Mount Instructions ...................................................................................................................... 7
Troubleshooting ................................................................................................................................... 8
Dimensions........................................................................................................................................... 9
Specifications ....................................................................................................................................... 9

1073DPX Channel Amplifier Introduction
The original Neve 1073 channel amplifiers are very popular mic preamplifiers,
considered by many to capture the very essence of the Neve sound. In
manufacture since the early 1970s, the discrete class-A design offers 3 bands of
EQ with one fixed high frequency and a high-pass filter.
The 1073DPX accommodates two separate 1073s in a stand-alone 2U rack-
mount unit. At its core, the 1073DPX retains the same basic circuitry as the
original 1073, but includes many additional features to ensure the unit sits
comfortably in the modern studio environment.
Configuring the 1073DPX
To use the 1073DPX, configure as follows:
 Connect the supplied 48V power adaptor (PS10501) to the 48V input.
Connect your mic/line or DI input source:
 - Mic input uses the XLR input of the XLR combo connector on the front panel,
or the XLR connector on the rear panel.
- Line input uses the 6.35mm jack input of the XLR combo connector on the
front panel, or the XLR connector on the rear panel.
- DI input uses the 6.35mm jack connector on the front panel.
Connect any intermediate sources to the insert loop as required, via the
6.35mm jack connectors on the rear panel.
 Connect the line output XLR (rear panel) into your system

 Switch on the 1073DPX

 Set the phantom power, DI earth lift, DI PAD and Mic I/P Z as required.

Front Panel
POWER: Switches the unit on or off. The adjacent LED lights when the unit is ON
FRONT: Switches the audio input to the front mic/line combo connector.
NOTE: The DI input always overrides the Mic input, whether the FRONT
switch is pressed or not.
DIGI: Switches the line input and output to the rear digital module. In digital
mode the front/rear mic input, DI input, and analogue line output
continue to operate normally.
NOTE: The digital module is an optional extra and is not included as
standard.
XLR/Jack combo input:
Use the XLR input for microphone sources and the 6.35mm jack input for
line-level sources.
48V: Applies 48V phantom power to the XLR microphone input (front and
rear). The adjacent LED lights when phantom power is active.
Lo Z: The default input impedance on the microphone input is 1200Ω. Pressing
the Lo Z switch reconfigures the input for 300Ω input impedance.
LIFT: Provides ground lift for the DI input. If hum/buzz occurs when using a DI
input, pressing this switch may alleviate the problem by breaking any
ground loop.
-20: Provides 20dB of attenuation to the DI input. In the default position (no
attenuation) the input impedance of the DI input is approximately 1MΩ.
When set to -20dB attenuation (switch depressed) the input impedance
of the DI input is approximately 10kΩ.
DI I/P: High-impedance balanced input for direct injection.
NOTE: When a 6.3mm jack is inserted into the DI input, all other
microphone inputs are automatically disconnected. Use the Mic
side of the gain control when using the DI input.
High Frequency:
Smooth +/-16dB fixed frequency shelving at 12kHz,
Mid Frequency:
Smooth +/-18dB peaking, fixed 'Q' with selectable centre frequencies
of 0.36kHz, 0.7kHz, 1.6kHz, 3.2kHz, 4.8Kh, 7.2kHz.
Low Frequency:
Smooth +/-16dB shelving with selectable frequencies of 35Hz, 60Hz,
10Hz, 220Hz.

High Pass Filter:
18dB per octave slope, switchable between 50Hz, 80Hz, 160Hz, 300Hz.
Phase: Reverses the phase of the output signal. In the default position, absolute
phase is preserved through the unit.
EQ: Switches the equalisation circuit into the signal path.
INS: Switches the insert loop into the signal path.
PRE: Positions the insert loop before the equalisation circuit (pre-EQ). In the
default position (switch not depressed) the insert loop is positioned
immediately after the equalisation circuit (post EQ).
LEVEL: Adjusts the output audio level. This control is post-EQ be pre-output
stage. The thick line on the graticule indicates the point of nominal unity
gain; the unit has ~5dB in hand. Pressing this knob cycles the level
meter take-off point through three possible points in the signal path,
indicated by the adjacent LEDs.
Take-off LEDs and Clip Indication:
One of three LEDs lights green to indicate the selected take-off point
for the level meter, chosen by pressing the LEVEL knob. The three
possible take-off points are: pre-EQ, post-EQ, post output stage. In
addition, LEDs will light red if their respective take-off point is close to
clipping. Clip indication is always active whichever take-off point
happens to be selected.
Level Meter:
Peak responding level meter. The audio level can be monitored at one of
three locations chosen by pressing the LEVEL knob.
VOLUME:
Controls the volume of the headphone output.
Pressing the knob cycles the headphone monitoring location though
three options, indicated by the adjacent LEDs:
Channel 1 only
Channel 1 (left ear) + Channel 2 (right ear)
Channel 2 only
Phone Jack:
Stereo headphone output jack.

Rear Panel
+48V DC: Connect the accompanying power supply (PS10501) to
power the unit.
Fuse: Always use the correct fuse rating, as indicated beside
the fuse holder. Fuse Rating: T1A, 250v 20mm, Ø 5mm.
MIC I/P: Balanced microphone input.
LINE I/P: Balanced line input.
INSERT SEND: Balanced line-level output for insert loop.
INSERT RETURN: Balanced line-level input for returning signals.
LINE O/P: Balanced line-level output.
DIGITAL OPTION PANEL: Optional Digital module is fitted here.




Rack Mount Instructions
 Elevated Operating Ambient- If installed in a closed or multi-unit rack
assembly, the operating ambient temperature of the rack environment may be
greater than room ambient. Therefore, consideration should be given to
installing the equipment in an environment compatible with the maximum
ambient temperature (50°C) specified by the manufacturer.
 Reduced Air Flow - Installation of the equipment in a rack should be such
that the amount of air flow required for safe operation of the equipment is not
compromised.
Mechanical Loading - Mounting of the equipment in the rack should be such
that a hazardous condition is not created by improper or uneven mechanical
loading.
Reliable Earthing - Reliable earthing of rack-mounted equipment
should be maintained. Particular attention should be given to supply
connections other than direct connections to the branch circuit (e.g. use
of power strips).

Troubleshooting
No audio at the line output

Check all connections to the unit. For example, check that all necessary
inputs and outputs are plugged into the same channel.
Check the setting of the LEVEL control. Turn clockwise to increase the output
level
Check the setting of the gain control. Turn clockwise (mic mode) when using
a microphone source. Turn anti-clockwise (line mode) when using a line-level
source.
Check that the FRONT switch is set to the desired position. This switch
should be depressed when the audio source is connected to the front combo
connector.
Check that the DIGI switch is set to the desired position. The switch should
be depressed when the audio source is via the digital module.
Check whether the insert loop is in use. Set the INSERT switch to the
default position (not depressed); if line output signal becomes present, this
indicates a problem with connections to the insert loop or with the external
equipment in the loop.
No headphone output

Check that a signal is present at the line output (see previous).
Check the headphone monitoring location by pressing the VOLUME knob.

Dimensions
Stand-alone
Modules
Width
mm (inches)
Height
mm (inches)
Depth
mm (inches)
Approx. Weight
kg (lbs)
1073DPX Module
480 (19)
88 (3.5)
356 (14)
10 (22)
Modules
Power
1073DPX Module
48Vdc, 480mA ±20mA excluding digital module. Negative
Earth
Specifications

Microphone Input:
Input Impedance 300 or 1200, gain
+80dB to +20dB in 5dB steps.
Line Input:
Input Impedance 10k bridging, gain
+20dB to -10dB in 5dB steps. Both inputs
are transformer balanced and earth free.
DI Input:
Input Impedance 1M (PAD off)
10k(PAD on). Gain +80dB to +20dB in
5dB steps.
Output:
Maximum output is >+26dBu into 600.
Output impedance is 75 @1kHz.
Outputs are transformer balanced and earth free.
Distortion:
Not more than 0.07% from 50Hz to 10kHz
at +20dBu output (80kHz bandwidth) into
600.
Frequency Response:
+/-0.5dB 20Hz to 20kHz, -3dB at 40kHz
Eq Out.
Noise:
Not more than -82dBu at all Line gain settings
Eq In Flat/Out (22Hz to 22kHz bandwidth, 150Ω input
termination), EIN better than -125dBu @ 60dB gain.