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  • IGS Alter 500 Black Face -

IGS Audio Alter 500 FET Compressor - Black

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Product Description




The ALTER is a single-channel unit with stepped input and output controls. The Ratio switch has six positions, including two additional to the original 1176 1:1 and 2:1 settings. Slam Mode can be turned on with a separate switch, working regardless of the Ratio settings. Attack and release times can be set to Fast / Mid / Slow with 3-pole switches. The compressor is equipped with a relay bypass, achieved on the front panel. The input is balanced with a modern, low-noise op amp and the output with a Carnhill transformer. The circuit has two amp stages, between which is the output control. The stage amps are based on the discreet API2520 circuit. 

Front panel, Notable features: 
Variable Attack - 3 ranges: 0.02, 0.2 and 0.8 ms. 
Release – Amp recovery time to the value of 0.85 max. Range: 50ms, 600ms, 1.5 sec. 
Ratio ranges: from 1:1 (line amp), through 4:1 (compressor) to 20:1 (limiter) 
SLAM - allows the enabling of All-Buttons-On - aka "4 button trick" 
GR - very fast LED indicator showing the compression level in the range from 0 to 30dB. 

- API 500 standard Module, 
- Input impedance: 1kOhm, 
- Output impedance: 600O on Carnhill- Maximum input level: +20 dBu, 
- Maximum Output Level: +22 dBm, 
- Total Harmonic Distortion: 0.2%, 
- Frequency response: +/- 0.1 dB 20Hz to 20kHz, 
- Gain: 40dB- The signal to noise ratio: greater than 99 dB- Attack: 0.02, 0.2 to 0.8 ms, 
- Release: 50ms, 600ms, 1.5 s,

Product Videos

IGS Alter 500 demo 05:59 In today’s episode on Spectre Sound Studios I’ll be discussing the Alter 500 analog compressor from IGS Audio. Check below for the gear I discussed in today’s episode. Subscribe for more! A few of the products I discussed today in my video: For more Spectre Sound Studios videos click here! MERCH: Patreon: Follow Spectre Sound Studios: Website: Facebook: Twitter: Instagram: About Spectre Sound Studios: I'm Glenn Fricker, engineer here at Spectre Sound Studios. I love making records, and after doing it for sixteen years, I want to pass on what I've learned. On my channel you can find tutorials on how to record guitar, bass, real drums and vocals. There's reviews and demos of tube amps, amp sims, drums, mics, preamps, outboard gear, and plugin effects. Everything you've wanted to learn about recording Hard Rock & Heavy Metal can be found right here on this channel! I also respond to your comments & questions: The best make it into the SMG Viewer's Comments series of videos. Loads of fun, lots of laughs. Thanks for checking out my channel & please subscribe!

  • IGS Alter 500 ... In today’s episode on Spectre Sound ...

Warranty Information

Comes with Manufacturer's 3 Year Warranty

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