IGS ONE LA Optical Compressor
The IGS ONE LA is an optical compressor, inspired by the legendary solution well known from the '60s. This is a very easy to use and great sounding tool.
The IGS ONE LA is an optical compressor, which is a very easy to use and great sounding tool. The ONE LA 19" has a sonic character that makes it sought after by many recording engineers.
The IGS ONE LA is a photo-optical compressor, referring to the legendary solution of United Recording Electronics Industries. It is an input and output transformer balanced, full tube device. The input of the system is equiped with a Sowter 4383 transformer, the output with Edcor 15k/600. Two 6N2P-EW 6N1P-EW dual-triodes are installed on the audio circuit, while the compression circuit is equipped with the 6N2P-EW triode and the 6AQ5 pentode, that controls the work of the T4BX photocell. On the front panel you can adjust the output gain (GAIN) and compression threshold (PEAK REDUCTION). Additionally, you can select the operating mode between Compress and Limit. You can also set the meter to VU or Gain Reduction reading. Inside the device are 4 tubes with 245V anode voltage. The system is mounted on a PCB, which results in short connections inside the device, improves the bandwidth and stability. On the rear panel the input and output XLR connectors have been installed. The whole device is designed to work with a symmetrical 4dBu signal.
ONE LA Design
The IGS ONE LA is an input and output transformer balanced, full tube device. The input of the system includes a Sowter 4383 transformer, the output an Edcor 15k/600. Two 6N1P-EW dual-triodes are installed on the audio circuit, while the compression circuit is equipped with the 6N2P-EW triode and the 6AQ5 pentode, which control the work of the T4Bx photocell.
Simply adjust the input Gain and Peak Reduction.
ONE LA Controls
The ONE LA 19" has simple controls: a Peak-Reduction knob controls the gain of the side-chain circuit, and therefore, the gain reduction threshold; Gain Control for the make-up gain; and a Limit/Compress switch to alter the compression ratio. The VU meter may also be switched to show gain reduction or output level
It is known that in the case of ONE LA the nature of the device depends on the T4B photo-cell. The original solution used the TELETRONIX electroluminescent panel, that was illuminating the photo resistor. The idea of opto-compression originated in the past is still being cultivated today. IGS Audio has developed its own photocell equivalent to T4B called T4BX. The use of carefully selected components in the production of the T4BX photocell, and their individual measurement and matching, result in completely repetitive sound qualities of each device.
ONE LA Stereo pair
Matched pairs are also available. The stereo linking socket is located on the rear panel. An RCA-RCA cable is all you need to link two units. Perfect stereo matching is achieved by hand selected tubes and Elma switches.
IGS ONE LA Optical Compressor Features
- Legendary Optical Compression Sound
- All stepped manipulators via 24-step Elma switches
- Stereo Linkable by a single RCA-to-RCA cable
- Matched Pairs Available
- Easy to use
- T4BX photocell
- Sowter 4383 transformer for input
- Edcor 15k/600 transformer for output
- Two 6N2P-EW 6N1P-EW dual-triodes in audio amp circuit
- 6N2P-EW triode and the 6AQ5 pentode work in tandem with the T4BX photocell
IGS ONE LA Optical Compressor Specifications
- Device type
- Optical Compressor Yes, T4Bx or T4B photocell
- Basic features
- All stepped manipulators 24 step Elma switches
- Stereo Link Yes, RCA-RCA cable
- Input & Output
- Input Impedance (balanced) 600 Ohm
- Output Impedance (balanced) 600 Ohm
- Audio transformers Input: Sowter, Output: Edcor
- Operating Level +4dBu
- Max input level +16dBu
- Max output level +18dBu
- Dynamic Range >110 dBA (@ 1kHz, +24 dBu)
- Max. gain 30dB
- Max Gain Reduction 36 dB
- Time constants
- Attack: 1ms
- Release: 0.5 – 5s (50% @ 60ms)
- Distortion (@ 20 Hz - 20 kHz)
- THD+N 85 dB (A)
- Voltage 115/230V AC, 50 - 60Hz
- Power consumption 40W
- Power supply Internal
- Packing box
- Dimensions 70 x 50 x 30cm
- Shipping weight 7kg / 15.4 lbs
- Tube set 2x6N1P-EW, 6N2P-EW, 6AQ5
IGS ONE LA Optical Compressor Includes
- IGS ONE LA Optical Compressor
- Manual & Literature
- IEC Power Cable
IGS ONE LA Optical Compressor Downloads
What We Think
IGS Audio gear is some of the most impressive 500 series and full 19-inch rack offerings we've seen, to date. All of it is incredibly beefy both in regards to sound and build quality. Front End Audio is seeing something quite special with all of IGS's products and we are excited to be bringing them to you!
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