Two channels of iconic diode bridge compression, thoughtfully improved and refined for modern tracking, mixing, and mastering.
Originally developed for the dynamics circuit of the acclaimed Shelford Channel, the 5254 Dual Diode Bridge Compressor captures the soul of Rupert Neve’s original 2254 compressor while providing modern updates including advanced timing control, significantly lower noise, fully stepped controls throughout, and internal parallel processing capabilities.
 
SPECIFICATIONS
 
XLR LINE INPUT TO XLR LINE OUTPUT
Compressor Bypassed.
zSource = 40 Ohm Balanced
INPUT IMPEDANCE
10K Ohm
OUTPUT IMPEDANCE
40 Ohm
MAXIMUM INPUT LEVEL
+4 dBu Selected: +26.7 dBu typical
MAXIMUM OUTPUT LEVEL
+26.7 dBu typical
NOISE
10 Hz - 120 kHz: -104 dBu typical
FREQUENCY REPONSE
10 Hz to 120 kHz: +/- 0.25 dB typical
THD+N
From 22 Hz - 22kHz BW.
@ 1 kHz @ Maximum Level: 0.0008% typical
COMPRESSOR NOISE
From 22 Hz - 22kHz BW.
zSource = 40 Ohms Balanced
NOISE
@ 0 dB Make-up gain: -84.5 dBu typical
@ +20 dB Make-up gain: -64.5 dBu typical
COMPRESSOR TIMING
TIMING measurements represent the full range achievable between 1.5:1 and 8:1 ratio and FAST mode.
FAST 
Attack 250μS - 2mS // Release 100mS - 200mS typical 
MF (MEDIUM FAST) 
Attack 1mS - 5mS // Release 100mS - 200mS typical 
MED (MEDIUM) 
Attack 3mS - 18mS // Release 350mS - 700mS typical 
MS (MEDIUM SLOW) 
Attack 5mS - 40mS // Release 600mS - 1S typical 
SLOW 
Attack 10mS - 80 mS // Release 800mS - 1.5S typical 
AUTO 
Attack 5mS - 40mS // Release T1 400-900mS, T2 1-2S typical
PRODUCT DIMENSIONS
19” (48.3 cm) x 9” (22.9 cm) x 1.75” (4.4 cm)
SHIPPING DIMENSIONS
24” (61 cm) x 13” (33 cm) x 4” (10.2 cm)
SHIPPING WEIGHT
10 lbs. (4.5 kg)