ARREL Audio
R-506 User Manual, Issue 0.1
Page 9
Cut, cut off frequency is changed by rotating the cross over knob in the range 50 Hz, 500
Hz.
TRUE BY-PASS ON SWITCH (LED)
The compressor can be bypassed (true by-pass) by pressing the bypass button.
R-506 Operating modes
The R-506 provides three main different operating modes:
1. Dual Band compressor.
2. Single Band compressor (full band on the envelope detector).
3. Single band compressor (LO cut on the envelope detector).
The operating mode is selectable by the ON-OFF-x10 switch shown in Fig. 1 and 2.
Moreover the side chain can be externally controlled by using one external 3.5 mm jacks.
The Side chain jack is mono.
R-506 Dual Band Mode
In this operative mode the R-506 is a true dual band compressor.
The two channels at the out of the crossover circuit are compressed in parallel on two
different gain processors.
The signal at the input of the two side chains (envelope detectors) can be user defined by
an internal dip switch.
Four possibilities are provided:
DP1 DP2
Function
OFF OFF The side chain are controlled by the corresponding crossover output
ON
OFF The LO side chain is controlled by a mix of the signals from the
crossover outputs (68% signal from LO and 32% from HI)
OFF ON
The HI side chain is controlled by a mix of the signals from the
crossover outputs (68% signal from HI and 32% from LO)
ON
ON
The LO side chain is controlled by a mix of the signals from the
crossover outputs (68% signal from LO and 32% from HI)
The HI side chain is controlled by a mix of the signals from the
crossover outputs (68% signal from HI and 32% from LO)
In the dual band mode, the two true RMS detectors (envelope detectors) speeds are
optimized for the low and high band of the compressor.
R-506 Single band (full bandwidth on the envelope)
In this case the compressor architecture is typical single band architecture. The HI gain
control circuit and the corresponding chain are used to process the input signal (red
knobs).
The envelope detector is controlled directly from the dry signal (input signal). The
crossover is excluded.
