Rupert Neve Designs Portico II, Руководство по эксплуатации

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4
MBP Front-Panel Features
Compressor
Threshold
This 31-detent potentiometer adjusts the level at which the compressor begins to attenuate the signal and is fully vari-
able within a signal level range of +20dBu to -30 dBu. If the compressor input signal level exceeds the set threshold
level, compression will occur.
Ratio
This 31-detent potentiometer adjusts the compressor slope between 1:1 to 40:1. Example: if the ratio control is set to
3:1, and the signal level exceeds the set threshold by 15dB, the compressor will attenuate the signal level by 10 dB from
input to output, allowing the output to increase in level by a total of 5 dB.
Blend
This 31-detent potentiometer adjusts the mix ratio of uncompressed (dry) signal with the compressed (wet) signal.
When Blend is fully counter-clockwise (CCW), only the
uncompressed signal is audible. When Blend is fully clockwise
(CW), only the compressed signal is audible. Setting Blend anywhere between 0% and 100% achieves parallel compres-
sion.
Comp In
This illuminated push-button switch engages the compressor-limiter section on its respective channel. Engaging or
disengaging the “Comp In” button never affects SILK status and will not affect SFE status unless SFE to COMP is engaged.
Bypass All
This illuminated push-button switch toggles the PIIMB’s hard-wire bypass on both channels. When engaged, the PIIMB’s
Neutrik XLR input jacks are
directly connected to its Neutrik XLR output jacks, eliminating all internal amplifier circuitry
from the monitor path, thereby accomplishing a true bypass. This can be used for A-B comparison at any time. In the
event that the PIIMB experiences a loss of AC power, the PIIMB will automatically switch to hard-wire bypass mode.
FF/FB
This illuminated push-button switch toggles between two different compression modes: Feed Forward and Feed Back.
The distinction between these two types of compression is that the side-chain detector of a feed-forward compressor is
fed from the compressor input, before the gain control element, while the side-chain detector of a feed-back compressor
is fed from the compressor output, after the gain control element. Vintage compressors were more commonly feedback
designs, whereas a lot of modern designs tend to utilize feedforward topologies.
Ultimately, each topology has its own advantages and disadvantages, so we encourage the user to experiment with
both modes, then choose the most suitable mode for their particular application. In very general terms, feedback com-
pression tends to sound more natural, but can’t achieve some of the dynamic envelope control that is available with
feedforward compression.
Note: Due to the nature of the side-chain manipulation between these two compression modes, Feed Back mode reduc-
es the overall compression ratio range indicated on the PIIMB’s front panel silkscreen. The silkscreened ratios are only
available in Feed Forward (default) operation.