INTRODUCTION Thank you for your purchase of the 5043 Duo Compressor Limiter. Everyone at Rupert Neve Designs hope you enjoy using this tool as much as we have enjoyed designing and building it. Please take note of the following list of safety concerns and power requirements before the use of this or any Portico SeriesTM product. Safety It’s usual to provide a list of “do’s and dont’s” under this heading but mostly these amount to common sense issues.
INTRODUCTION In a traditional console large, bi-polar regulated supplies were used, necessarily having a shared common 0 "ground" wire. Crosstalk between modules resulted, often accompanied by R.F. interference due to the unbalanced loop "antennas" that were inevitably present. This interference, in some cases, could actually be heard, but even at low levels below audibility there was a potential intermodulation with the desired signal.
FEATURE LIST 5043 Compressor/Limiter Duo - Front Panel RATIO Changes the amount of gain reduction above the set threshold Link Connects the DC control Buss Input line to other channel Toggles between Line and to TRS jack on rear and Mixing Buss inputs FB Changes the operation from FeedFoward to FeedBack IN Compression circuits In or bypassed Attack Meter Select Changes the time delay Toggles signal sent before compression starts to meters from channel A to B Threshold Sets the level at which gain reduct
INTRODUCTION A NOTE ON DISTORTION The human hearing system unconsciously perceives minute signals both within and well beyond the traditional audio frequency spectrum.
DESCRIPTION GENERAL DESCRIPTION The Rupert Neve Designs 5043 module is a half rack width, 1.75" (1U) module in the now wellknown Portico™ style. The 5043 is ideal for both tracking and mixing applications with selectable Mixing Buss or Line inputs. The 5043 is an ideal choice for either standalone operation, or forming the core of a larger mixing system.
DESCRIPTION THE CONTROL CHAIN: FEED FORWARD or FEED BACK If the V.C.A. Control voltage is taken from the 5043 input, (i.e. before the V.C.A.) the V.C.A. "knows" right away that a gain change is required and there is almost immediate response. This is known, logically, as a "Feed-Forward" compressor. If the V.C.A. control voltage is taken from the 5043 output, (i.e. after the V.C.A.) it cannot act immediately on the V.C.A. because it has already been modified by settings of the V.C.A.
FEATURES THE 5043 LINE AMPLIFIER The Portico™ 5043 consists of two identical Line Driving amplifiers having transformer balanced inputs and outputs. The sonic quality of these amplifiers is such that, by providing galvanic isolation, simple single-sided circuit topology, and freedom from grounding problems, they are capable of enhancing the sonic quality of many signal sources, especially those of digital origin. The sonic "signature" is one of extreme purity and the image is consistent with that of Mr.
FEATURES THRESHOLD THRESHOLD control covers the range from below -30dB to +22dBu. When THRESHOLD is set at a low level with a fairly high RATIO, the amount of gain reduction will be considerable and it may be necessary to use some GAIN after the compressor to restore the apparent signal level. RELEASE (or RECOVERY) and ATTACK TIME Range of RELEASE time is 100 mS to 2.5 Seconds. Range of ATTACK time is 20 mS to 75 mS.
FEATURES BUSS INPUT BUTTON Routes the BUSS inputs to the compressor. Each of the "A" and "B" units has a choice of LINE or BUSS input. The LINE inputs are transformer-balanced bridging inputs. The BUSS inputs are configured as balanced and floating inputs that, when fed from a source impedance of 10,000 ohms, will produce unity gain, (Compressor-Limiter switched out) overall. Several modules within the Portico™ Range are fitted with a "TO BUSS" switch.
FEATURES STEREO When the LINK push-button is engaged and the two channels, A and B, set to approximately the same values, GAIN control on both channels will be the same to preserve stereo balance, levels normally being controlled by the channel with the higher signal level. DUCKING When the LINK push-button is B A Portico engaged, the signal passing through channel A, may be used 5043 to control the amplitude of channel B.
SPECIFICATIONS 5043 Duo Compressor Limiter Specifications Gain Range: Continuously variable from –6 dB to +20 dB. Threshold Range: Continuously variable from –36 dB to +22 dB. Ratio Range: Continuously variable from 1.1:1 to “Limit” (40:1). Attack Range: Continuously variable from 20mS to 75mS Release Range: Continuously variable from 100mS to 2.5 Seconds. FF/FB: Feed-Forward or Feed-Back VCA control. LINK: Multiple 5043’s may be daisy-chained via the rear panel jacks.
BUSS IN LINE IN BUSS INPUT INPUT TRANSFORMER FB 12 THRESHOLD ATTACK RELEASE RECTIFIER VCA COMPRESSOR IN LINK GAIN TO CH B LINK FROM CH B RECTIFIER FROM CH B OUTPUT METERS A B OUTPUT TRANSFORMER REDUCTION OUTPUT LEVEL LINK LINE OUT BLOCK DIAGRAM