BSS Audio
Quad Compressor/De-Esser
DPR-404
The professional multi-channel dynamic
processor
In nearly every type of audio production
environment the availability of versatile
dynamic gain control has become more
or less mandatory.
An ever increasing diversity of mono
and stereo programme source types are
now being handled by higher quality
signal chains and storage media. The
benefits of accurate and creative
dynamics processing are now relevant
to a wider range of audio professionals
than ever before.
BSS answers this need with a versatile
1U package comprising four-channels
of advanced subtractive compressor /
limiter and HF de-esser facilities,
designed with the emphasis on flexibility and ease of use ... the DPR-404
4-CHANNEL COMPRESSOR DE-ESSER.
Each channel includes a variable Ratio
compressor / limiter that features our
proprietary “progressive knee” characteristic. This gives soft-knee, over-easy
musicality at low Ratios, varying
gradually towards dependable, hardlimiter precision at the maximum
setting. Threshold adjustment is
simplified by provision of an accurately
calibrated control scale and continuous
display of side-chain level up to the
threshold point. Gain Reduction
metering is also clearly integrated with
this display to provide intuitive monitoring of the system’s activity in use.
Attack and Release time constants are
automatically and continually regulated
by the dynamic and harmonic content
of the programme material, and so
require virtually no attention from the
operator.
For maximum versatility, however, each
can be selected to a FAST-Auto mode,
allowing greater choice for creative
treatment of individual sources. A gain
make-up control an output Clip indicator assist with normalisation of operating
levels and overload margins.
Additionally, each channel also includes an advanced but straightforward
HF De-esser. Previously only available
as a dedicated mode on the acclaimed
BSS DPR-402 dynamics processor, this
facility gives you smooth, frequency selective dynamic sibilance control
quickly and without unpleasant sideeffects or lisping. A dedicated two-led
display shows you the extent of the
sibilance processing, calibrated with a
helpful “enough” and “too much”
characteristic.
THRESHOLD control sets the level at
which gain reduction starts to occur.
BELOW Threshold meter displays signal
level below threshold to aid set-up.
RATIO control sets the amount of gain
reduction when signal exceeds the
threshold setting. Soft knee at low ratios,
hard limiting at maximum extremes.
GAIN REDUCTION meter displays the
degree of compressor / limiter activity
occurring, in dB’S.
CLIP LED indicates onset of channel
signal overload.
GAIN control allows the operator to
restore the compressed signal to nominal
operating levels.
All this high performance processing
power is housed in a rugged 1U 19"
steel case, with high grade electronics
and hardware being supported by a
robust power supply featuring superior
line regulation and interference suppression.
LINK switch allows channels 1/2 and 3/4
to be linked as pairs for stereo operation.
If you need compact but sophisticated
dynamics processing that helps get
things done fast the choice is simple :DPR-404.
DE-ESS control adjusts for the amount of
de-essing required, independent of the
compressor / limiter settings.
For over a decade, BSS have been
manufacturing professional audio
products that combine the highest levels
of performance with technical excellence and proven reliability. All of this
expertise and experience is encapsulated in the DPR-404 4-CHANNEL
COMPRESSOR DE-ESSER.
ATTACK and RELEASE time constants
are automatically programme-controlled,
but may be switched between FAST and
NORMAL ranges.
FREQUENCY control tunes the dynamic
HF shelf into the sibilant frequencies.
BSS Audio
DPR-404 Quad Compressor/De-Esser
TECHNICAL SPECIFICATIONS
Input Section
IMPEDANCE
MAX. INPUT LEVEL
CMRR
CONNECTOR
Output Section
IMPEDANCE
MAX. OUTPUT LEVEL
CONNECTOR
System Performance
FREQUENCY RESPONSE
NOISE
Measured to CCIR 4682
DISTORTION
SMPTE IM
CROSSTALK
Operating Controls
DEESS FREQUENCY
DEESS THRESHOLD
THRESHOLD
RATIO
ATTACK
Balanced 12k ohm
differential.
+ 20dBv.
> 50dB, 20Hz to 20Khz.
XLR331 or equivalent.
Balanced and floating to
drive 600 ohm loads.
+20dBv / 600 Ohm load.
XLR332 or equivalent.
+ 1DB, 20Khz, ultrasonic low
pass filter 3db at 32kHz.
<-86dBv
THD <0.05%,
20Hz to 20kHz.
<0.02%.
<90dB, 20Hz to 20kHz.
Variable from 10kHz to
10kHz, dynamic HF shelf
turnover frequency.
Variable from +20dBv to
30dBv, independent of
compressor/limiter settings.
Variable between +20dBv and
30dBv.
Variable from 1:1 to infinity:1
(LIMIT) progressive soft to
hard knee characteristic.
RELEASE
GAIN
LINK
Program dependent, auto time
constant. Nominal 200microsec (30
microsec FAST) for 10% response,
and nominal 2ms (300 microsec
FAST) for 63% response.
Program dependant, 2 part auto time
constant. Nominal 10ms (2ms FAST)
to 63% recovery after 4ms overdrive
10db above threshold, and nominal
1s (300ms FAST) to 63% recovery
after 40ms overdrive 10dB above
threshold.
Variable from 20dB to +20dB.
Stereo linkable in pairs 1/2 and 3/4
Channels 1 and 3 become masters.
Metering
GAIN REDUCTON
8 point LED display showing
progressive gain reduction from right
to left calibrated in dB’s.
BELOW THRSHOLD 5 points LED display showing
sidechain level below and up to
threshold.
CLIP
Single LED showing onset of channel
clip.
General
SIZE
WEIGHT
ELECTRICITY
SUPPLY
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.
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