DMCL Datasheet
Dual Mic-amp Compressor/Limiter
A Brief Guide
The Purest Analogue
...Direct to Digital
"The Pure Path Dual Mic-amp, Compressor-Limiter (DMCL)
comprises two identical closely matched microphone and
line amplifiers followed by high/low pass variable frequency
filters, dual high-resolution compressor-limiters and an
optional digital output. Output formats are AES/EBU, S/PDIF
and optical.
The microphone amplifier makes use of my balanced
instrument "Transformer-Like Amplifier" techniques,
providing many of the advantages of a transformer without
weight and cost penalties. In common with my previous
designs for the 9098i super analogue console and the
System 9098 range of outboard equipment, the DMCL
features very low noise even at mid gain settings.
Specifications are maintained even with input signals of
+26dBu at unity gain. In addition, I have paid particular
attention to the exclusion of high order harmonics. The line
signal is routed through a line input transformer. The same
transformer is used on the Pure Path "Channel in a Box"
and has been shown to significantly improve musicality.
The DMCL represents a significant advance in audio
engineering and is designed for engineers and producers
who need a powerful and compact outboard unit. It
combines all the favourable sonic qualities and features that
are desirable on the very best analogue mixing consoles
with the addition of multi-format digital outputs."
Mic Input
The microphone input circuit is Mr. Rupert
Neve's exclusive "Transformer Like Amplifier"
design as used in his previous designs for
the 9098i super analogue console and
System 9098 range of outboard equipment.
The input gain ranges from 0dB (unity) to
+66dB in 6 dB steps. Mic. trim is
continuously variable +/-12dB. The
microphone input impedance is 5k Ohms,
providing an ideal input for a 150 or 200 Ohm microphone. As the microphone amplifier can
handle up to +26dBu at unity gain it can also be used as an additional high quality line
Line Input
The 10k Ohm floating transformer line input provides uncompromising isolation and
protection against ground currents and unwanted signals.
Instrument Input
The instrument input is an alternative to the microphone amplifier. Input impedance is 2.2
M Ohms. The mic. rotary gain and mic. trim controls provide gain control for this input.
Hence the gain range is the same as for the microphone input.
Variable high and low pass frequency filters may be switched
in and out of the audio chain. The high pass filter has a
switchable slope of 18 or 24 dB/octave that is useful for
removing unwanted interfering signals or as help for shaping
the signal prior to recording. The low pass filter has a
switchable slope of 12 or 18 dB/octave that may be used for
signal shaping to adjust harmonic content.
A side chain switch is included to switch the filters into the
side chain path.
Compression may be either pre or
post filters. The unique Mr. Rupert
Neve "&MM" (and Much More!)
switch may be used to moderate
compression characteristics and
has proved to be a popular
feature on the "Channel in a Box".
Identical gain reduction can take
place across both A and B DMCL
channels by switching on the A-B
link. Furthermore, the link button
located on compressor B enables multiple DMCL's to be connected in a daisy chain format.
This mode of operation is useful when working on a surround sound stem. An insert
send/return point allows the insertion of other devices into the audio path. The return point
doubles as the key input.
Designed by a Legend
Crafted by AMEK
Optional Digital Output
For the first time ever on a Mr. Rupert Neve designed outboard
module an optional interface to the digital domain has been
The optional digital output provides simultaneous AES/EBU, S/PDIF
and optical outputs at selectable sampling frequencies of 44.1, 48,
88.2 and 96 kHz. With external sync. sources selectable from either
Word Clock or Pro Tools ® Superclock, the DMCL makes the
perfect front end partner to any digital console or digital audio
Mic Input
Frequency Response
Unity gain setting, 150 ohm source
10Hz to 200kHz (-3dBu)
Gain Range:
Unity to +66dB in 6dB steps
steps, +/-12dB variable trim.
High Pass Filter
Frequency Range (-3dB points)
20Hz to 300Hz
Unity gain
18 or 24dB per oct
Equivalent Input Noise DIN
(Bandwidth 22Hz-22kHz)
Input terminated with 150 ohms
(Measured with gain at 66dB)
(Measured with gain at 36dB)
(Measured at unity gain)
Harmonic Distortion
Unity gain setting
Input/Output level
THD measured @ 1kHz
Maximum Input Level
T.L.A. @ Unity gain
Low Pass Filter
Frequency Range (-3dB points)
2.5kHz to 28 kHz
Unity gain
12 or 18dB per oct
Line Input
Frequency Response
10Hz to 200kHz (-3dB)
Unity Gain
-12dB to +12dB
Gain Range
Overall Noise DIN
Measured at the output
Harmonic Distortion
Unity gain setting, input/output level +20dBu
THD measured @ 1kHz
Maximum Input Level
Balanced and floating transformer
Input @ unity gain
Instrument Input
Frequency Response
Unity gain setting,
10Hz to 200kHz (-3dB)
150 ohm source
Gain Range
Unity to +66dB
Harmonic Distortion
Unity gain setting
Input/Output level
THD measured @ 1kHz
Maximum Input Level
Unity gain
Input Impedance
>2M0 ohms
Input Impedance
-10dB to +24dB
Gain range
-40dB to +22dB
Threshold range
1:1 to 40:1
Ratio range
0.3ms to 300ms
Attack range
0.1Sec to 10Sec
Release range
Frequency Response
10Hz to 200kHz (-3dBu)
Unity gain
Channel Crosstalk
Unity gain path, level +20dBu.
Unused inputs terminated with 150 ohms
-120dBu @ 1kHz
-100dBu @ 15kHz
-120dBu @ 1kHz
-100dBu @ 15kHz
Digital Output
All digital measurements are made
with a sine wave signal of 997Hz
@ 48kHz internal sampling
frequency, unless otherwise stated.
0dB F.S.D. = +26dBu
Sampling Frequency Range
Internal Sync 44.1kHz, 48kHz, 88.2kHz, 96kHz
External Sync 30kHz to 96kHz
Harmonic Distortion
Input level at +20dBu (-6dB F.S.D.)
THD measured @ 997Hz
Frequency Response
Unity gain, sampling frequency 48kHz
10Hz to 23kHz (-3dB)
Unity gain, sampling frequency 96kHz
10Hz to 46kHz (-3dB)
Word Length
Dynamic Range
Main Output
Maximum Output Level
Unity gain
Harmonic Distortion
Input/Output level at +20dBu
THD measured @ 1kHz
10k ohms load
600 ohms load
Power Consumption
Analogue only version
With digital option fitted
20W max.
30W max.
International Headquarters
Langley House, Third Avenue,
Trafford Park, Manchester
M17 1FG, United Kingdom
T: +44 (0) 161 868 2400 E:
F: +44 (0) 161 873 8010 W:
A Harman International Company
All Trademarks acknowledged.
+44 (0) 161 868 2400
US Headquarters
+1 (888) 286 9358
Los Angeles
+1 (800) 585 6875
+81 (3) 5606 3101
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