IGS Audio Alter 500
Analog FET Limiting Amplifier and Compressor
The IGS Audio ALTER 500 is a analog FET compressor built in the 500 standard. The FET-type solution was used for the first its application in the legendary UREI 1176 compressor from the 70s. 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.
Till this day no better vocal compressor has been designed!
So much stuff inside!
The compressor is equipped with a relay bypass switch on the front panel. The input is balanced with a modern, low-noise op-amp and the output with an IGS Audio Custom transformer. The circuit has two amp stages, between which is the output control. The stage amps are based on the discrete 990 circuit. The level of gain reduction is shown by a 20 point led bar.
It's so FAT.
Can you believe it?
- FET Kompressor im 1176 Style
- Hardwire-Bypass
- Attack: 20, 400, 800 us
- Release: 50 ms, 600 ms, 1.1 s
- Ratio: 1:1 – 20:1
- SLAM-Mode für besonderen Klangcharakter
- Eingangsimpedanz (symmetrisch): 10k Ohm
- Ausgangsimpedanz (symmetrisch): 600 Ohm
- Betriebspegel: +4 dBu
- Max. Eingangspegel: +20 dBu
- Max. Ausgangspegel: +22 dBu
- Rauschpegel: -99 dBA
- Max. Verstärkung: 36 dB
- Max. Gain Reduction: 20 dB
- Frequenzgang: 8 Hz bis 20 kHz, +/- 0,1dB
- THD+N: 0,012% bei 0 dBu
- Leistungsaufnahme: 2,5 W