Golden Age Project COMP-554 MKII 500 Series Diode Bridge Compressor
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Description
The Golden Age Project COMP-554 MKII is the 500 Series version of the COMP-54 MKIII diode-bridge compressor, with extra routing and tone options for a lunchbox rack. The all-discrete Class-A path uses transformer-balanced input and output plus an interstage transformer. Stepped Threshold, Ratio, Attack, and Recovery (continuous Gain makeup) deliver 2254-style compression in a single 500 slot.
Sidechain, AIR, and Inserts
Three sidechain filter frequencies and three sidechain modes (Internal, Insert, External) cover bus and tracking work. External sidechain I/O is electronically balanced at +4 dBu on the right-slot rack connections. Dual insert connectors accept an EQ-573 in the audio and/or sidechain path. A three-position AIR EQ switch offers Flat, +3 dB, or +6 dB at 30 kHz. Separate hardwire bypass and compression OUT switches, stereo link, dual-reference output metering (+4 / +12 dBu), a two-position output termination switch, and soft-start power ramp complete the module. Transformers are prepared for Carnhill upgrade.
Specifications
- Type: 500 Series Class-A diode-bridge compressor
- Channels: 1 (single-width 500 module)
- Circuit: Discrete; no ICs in signal path; transformer-balanced I/O plus interstage transformer
- Controls: Threshold, Ratio, Attack, Recovery, Gain makeup
- Threshold: -20 dB to +10 dB
- Ratio: 1.5:1 to 6:1
- Stepped controls: All except Gain makeup
- Sidechain filters: Three selectable frequencies
- Sidechain modes: Internal, Insert, External (electronically balanced @ +4 dBu on right slot)
- AIR EQ: Flat, +3 dB, or +6 dB @ 30 kHz
- Meter: Output (+4 or +12 dBu reference) or gain reduction
- Bypass: Hardwire bypass; separate compression IN/OUT
- Inserts: Two connectors for EQ-573 in audio and/or sidechain path
- Link: Stereo link for two modules
- Output termination: Two-position switch
- I/O: Via 500 Series rack edge connector
- Power: 500 Series rack / lunchbox
- Form factor: Single-width 500 Series
- Weight: 1.91 kg (4.2 lb) as listed by distributor (may include packaging)
In the Box
- Golden Age Project COMP-554 MKII