JLA-3 Optical Leveling Amplifier

The JLA-3 is designed for use in demanding professional audio applications such as recording, broadcast and touring sound systems. In a compact 500-series module format the JLA-3 achieves the compression characteristics of widely accepted vintage optical compressors using a long-life interchangeable JT-5 optical gain reduction block for high performance, low power consumption and low heat generation. The sidechain IN/OUT switch disables gain reduction and the LIMIT/COMPRESS switch increases the compression ratio in limit mode for tighter peak limiting. The transformer-balanced input and output assure optimal noise rejection from long lines and provide the same input and output level performance in balanced or unbalanced applications. Internal jumpers allow the user to configure the module for low or high gain mode, unbalanced input, and input pin assignment for use with various rack and console configurations. Several models of plug-in optical blocks are available to custom-tailor the compression curve and timing for a wide variety of applications.   

Available at

Check out the JLA-3 samples under Compressors at the ZenPro Audio CLIP-A-LATOR site!

JLA-3 Specifications

Module format:                 

API 500 style plug-in dynamic range compressor

Meter:

 Sifam AL-15 Retro VU meter A-scale with amber dial light

Frequency Response:

20Hz - 20Khz +/- 0.6 dB

-3 dB points at 6 Hz and 180 KHz

Maximum Amplifier Gain:

Low gain mode: 16 dB

High gain mode: 40 dB

Maximum Output Level (with 600 ohm load):

                    +24 dBm at 2 Khz, THD+N < 0.3%

                    +22 dBm at 20 Hz, THD+N = 1%

                    +24 dBm at 20 Khz, THD+N < 1%

THD + Noise (At gain reduction of 0 dB and 10 dB):

< 0.3% at 2Khz, low gain, input level +4 dBu, output level +4 dBm

Signal to Noise Ratio:

77 dB below maximum output level at 2 KHz, gain knob set to 50

Gain Reduction:

30 dB maximum gain reduction

Attack time < 10 milliSeconds from 0 to 20 dB gain reduction

JT-5 Optical Attenuator plug-in module determines release time based on photocell response

Release time 1 second +/- 250 milliSeconds for 60% recovery (with JT5 Classic attenuator)

On-board connector for stereo link to a second JLA-3

Power Supply:

Supply current < 100 mA at maximum output level and/or maximum gain reduction

On-board regulation at +/- 12 VDC with for audio amplifier supply

Click here to download JLA-3 User Guide