BSS Audio
Quad Noise Gate
DPR-504
Expectations of audio quality, and to the
results that can be achieved with
creative sound manipulation are
changing dramatically. In professional
sound production, noise gating has
become one of the fundamental processes used on an ever-increasing range
of audio signal types. BSS have applied
extensive experience in practical
dynamics processor design and usage to
create the ideal tool in a quick-to-use
format that also conserves precious rack
space - the DPR-504 4-CHANNEL
NOISE GATE.
Ingenious proprietary techniques in
control and display technology are
employed to make the engineer’s life
easier without compromise to performance or versatility. For example, FAST
and AUTO Attack modes have been
optimised for accurate and transparent
performance over the widest variety of
programmed material. AUTO mode
continually regulates the gate’s speed of
response by analysis of the harmonic
and dynamic content of the input signal.
Hence, source types ranging from
percussion to bass guitar - even voice can all be gated fast and distortion free
with the minimum of attention from the
operator. FAST mode offers an
outstanding 20ms Attack time to handle
consistently the most demanding
percussion and synthesiser transients.
As a further aid to rapid set up, the
RELEASE control not only adjusts for
decay response of the gate channel but
simultaneously sets an appropriate Hold
period which tracks proportionally with
the Release time. This relationship
combines with a special, audio-tapered
Release characteristic to give subtle,
‘musical’ envelope shaping using only a
single control.
For multi-mic situations such as drums
or percussion set-ups, spillage can often
cause spurious, unwanted gate triggers.
The DPR-504 thoughtfully provides a
flexible parametric KEY FILTER on each
channel to allow frequency conscious
gating with absolute precision. Quick
adjustment by ear, using the momentary
KEY LISTEN switch, eliminates
hair-trigger threshold settings with ease,
and offers considerable scope for
special effects. The unique, ‘floating
window’ key level LED display gives the
engineer a constant visual indication of
signal level above and below threshold,
invaluable for quick set-up and for
spotting problems instantly during a
show or mix session.
Main Controls
In live sound mixing, to highlight
instruments such as lead and bass guitar
whilst keeping amplifier noise down
during quiet passages and breaks.
RELEASE/ HOLD continuously variable
combined Hold and Release. Hold
tracks proportionally with Release time.
To ‘clean up’ multi-milked drums or
percussion set-ups, eliminating spill
from back line and monitors on stage, as
well as from adjacent percussion
instruments.
For recording multiple close-mic
configurations, the DPR-504 readily
eliminates uncontrolled room reverb,
allowing the engineer to mix this in
accurately from ambience mics.
To eliminate tape noise when
mixing from multitrack, or to cut out
noise from digital samplers and
keyboards. Stereo linking ensures
accurate gating without image shift.
Special effects such as gated reverb
or modulation of a synth track by the
hi-hat to give accurately synchronised
16th chords, for example.
In broadcasting, on multiple mono
or stereo clean-feed/mix-minus lines, to
cut down on background noise when
commentators or journalists are not
speaking.
KEY FILTER and KEY LISTEN provides
easier and more accurate side-chain
control with a variable width, constant
Q band-pass filter. KEY LISTEN
monitors side-chain signal for accurate
key filter tuning.
KEY LEVEL METER and THRESHOLD
Simultaneous average and peak level
indication. Tracks threshold-control
rotation in relation to a fixed gate
opening point.
GATE OPEN MARKER indicates actual
gate-open / closed status, while
including the set dynamics.
ATTACK
Switchable auto / fast innovative AUTO
mode, continuously monitors spectrum
of input signal level variation. Sets
optimum attack response for minimum
loss of leading edge information.
CHANNEL BYPASS for silent re-setting
and insertion switching.
LINK for two-channel master / slave
operation. Stereo linkable in pairs 1/2
and 3/4. Channels 1 and 3 become
masters.
KEY SOURCE allows access to external
equipment for alternative equalisation
and other key sources. Extra gain is
available for direct connection of
contact microphones.
BSS Audio
DPR-504 Quad Noise Gate
TECHNICAL SPECIFICATIONS
Input Section
IMPEDANCE
MAX INPUT LEVEL
CMRR
CONNECTOR
Output Section
IMPEDANCE
MAX OUTPUT LEVEL
CONNECTOR
RANGE
RELEASE
Balanced 12kOhm differential
+20dBv
>50dB, 20Hz to 20kHz
XLR331 or equivalent
Balanced and floating to drive
600 Ohm loads
+20dBv into 600 Ohm load
XLR332 or equivalent
Switchable attenuation
between 70dB and 20dB The
latter may be user defined by
internal links
System Performance
FREQUENCY RESPONSE
+ 1dB, 20Hz to 20kHz
Ultrasonic low pass filter 3dB at 32kHz
NOISE
Measured to CCIR 4682 Zero
attenuation : <-86dBv
Maximum attenuation:
<-90dBv
DISTORTION
THD less than 005%,
20Hz to 20kHz
SMPTE IM
< 002%
CROSSTALK
> 90dB 20Hz to 20kHz
Operating Controls
KEY FILTER FREQUENCY
KEY FILTER WIDTH
KEY SOURCE
THRESHOLD
ATTACK
LINK
Metering
KEY SIDE CHAIN
GATE OPEN
EXT KEY SOCKET
General
SIZE
WEIGHT
POWER SUPPLY
Combined Hold/Release function is
variable 1ms to 3 sec Hold period
tracks proportionally with Release
Stereo linkable in pairs 1/2 and 3/4
Channels 1 and 3 become masters
Simultaneous average and peak
reading 12 point LED display
showing 20dB range either side of
threshold
Single LED shows exact gate status
and mimics response profile
3 pole, ¼” RTS jack socket used for
EXT keyin or key insert functions
482mm x 44mm x 282mm
19" x 1.75" x 11"
5kg (11lbs) gross shipping.
Switched 120/240V +10% 20%
50/60Hz.
In keeping with our policy of continued improvement, BSS Audio,reserves the right to
alter specifications without further notice.This product was designed developed and
produced by BSS Audio, Hertfordshire, England.
Variable between 30Hz and
15kHz centre
Variable between 05 and 10
octaves
Internal or External, via rear
panel ¼”TRS jack
Variable between +20dBv and
50dBv
Audio attack switchable FAST
(20µs) or AUTO (40µs 5ms,
programme dependant)
BSS Audio, A Division of Harman International Industries Ltd,
Cranborne House, Cranborne Road, Potters Bar,
Herts EN6 3JN, England
Tel +44(0)1707 660667 Fax +44(0)1707 660755
email: info@bss.co.uk, online http://www.bss.co.uk
BSS Audio USA
1449 Donelson Pike, Nashville TN 37217
Tel (615) 360 0277 Fax (615) 360 0480
email: BSSAudioUSA@harman.com
EMail info@bss.co.uk