The IGS A-Type 525 500-Series Compressor is inspired by a legendary American design from the 1970s. It features a compact design while maintaining classic compressor features.
The IGS A-Type 525 500-Series Compressor circuit is built entirely with discrete components in a through-hole assembly. The compressor input is balanced by the SSM2141 op-amp, while the output is transformer-balanced. An additional, second audio transformer is responsible for the feedback signal, which, after adjusting the time constants, returns to the compression control element, the VCR (Voltage Controlled Resistor). The control signal has a negative value relative to the circuit ground, and its value directly affects the VCR resistance, which in turn adjusts the gain of the first amplification stage.
Simple and fast operation thanks to the intelligent Gain control system
The compressor is equipped with a unique set of controls, including a „Compress” switch that simultaneously changes both Gain and Threshold values. This allows you to adjust compression parameters while maintaining constant peak signal levels. Additionally, separate Threshold and Output knobs allow for precise control over the compressor’s activation point and output signal.
Ultra-fast attack for perfect peak control
The device offers two modes of operation: Compressor (2:1) and Limiter (20:1). The Attack time is fixed and very fast at 15μs. The Release time can be set to one of four options: 0.1s, 0.5s, 1.5s, and 2.0s. An additional mode is the de-esser, designed to reduce sibilance in vocal recordings.
Applications
The A-Type 500 has a wide range of applications. It works exceptionally well on vocal tracks, acoustic and bass guitars, various percussion instruments, and many other sources. Suitable for tracking, mixdown, or program compression, with hardwire bypass and multi-unit linking capability.
IGS A-Type 525 500-Series Compressor Features
- Reissue of the original American "feedback" compressor with fully discrete design and balanced input/output.
- Features variable threshold, output, and "Compress" control for dynamic adjustments without level changes.
- Offers fast attack (15μs), four release modes, and a De-Ess function for reducing sibilance in vocals.
IGS A-Type 525 500-Series Compressor Specifications
- Input & Output
- Audio Transformers: Yes, IGS custom transformers
- Input Impedance (balanced): 10k, SSM2141
- Output Impedance (balanced): 75 Ohm, IGS custom transformer
- Levels
- Operating Level: +4 dBu
- Max Input Level: +27 dBu
- Max Output Level: +28 dBu
- Max Gain Reduction: -25 dB
- Max. Gain: 25 dB
- Noise Level: -99 dBA
- Time constants
- Attack: 15us
- Release: 100ms - 2s
- Ratio: 2:1, 20:1
- Bandwidth
- Frequency Response: 8 Hz to 20 kHz, +/- 0.1dB
- Distortion (@ 20 Hz - 20 kHz)
- THD+N: 0.014%
- Power
- Power Consumption: 2.5W
IGS A-Type 525 500-Series Compressor Includes
- IGS A-Type 525 500-Series Compressor
- Manufacturer Warranty
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