LA-40MKIII

Conversion in Both Directions
Four channels convert unbalanced signals to balanced outputs, while four additional channels convert balanced signals to unbalanced outputs.

Flexible Operating Levels
Interface -10 dBV unbalanced equipment with balanced systems operating at +4 dBu or -20 dBu.

Individual Channel Trims
Fine-tune each channel within a ±12 dB range for accurate level matching between sources and destinations.

Audio Distribution in Both Directions
Link channels to distribute one unbalanced source to multiple balanced outputs or one balanced source to multiple unbalanced outputs. Each section supports single-input/four-output or dual single-input/two-output configurations.

RCA and XLR Connectivity
Dedicated RCA and XLR inputs and outputs accommodate consumer playback devices, professional mixers, recorders and installation equipment.

Signal Presence Indicators
LED indicators provide a quick visual check of incoming audio activity.

Ground-Lift Controls
Individual balanced-connector ground lifts and a GND ALL LIFT switch help reduce ground-loop noise when interconnecting equipment.

Independent AC Convenience Outlet
A three-prong AC outlet operates independently of the main power switch.

Compact Rackmount Format
House both conversion sections and audio distribution functions in a single 1U rack space.

General
Device Type: Bidirectional balanced/unbalanced line level converter and audio distribution amplifier
Unbalanced-to-Balanced Channels: 4
Balanced-to-Unbalanced Channels: 4
Distribution Configurations per Section: 1 input to 4 outputs; dual 1 input to 2 outputs
Per-Channel Trim Range: ±12 dB
Signal Indicators: LED signal presence indicators
Ground Controls: Individual balanced-connector ground lift and GND ALL LIFT
Rack Height: 1U

Unbalanced Inputs
Connectors: RCA jacks (4)
Input Impedance with All INPUT LINK Switches Off: 23 kΩ
Input Impedance with All INPUT LINK Switches On: 5.7 kΩ
Nominal Input Level: -10 dBV ±1 dB
Maximum Input Level: +9 dBV
Signal Indicator Detection Level: -38 dBV or higher

Balanced Outputs
Connectors: XLR-3-32 equivalent (4)
Pin Assignment: 1 ground, 2 hot, 3 cold
Output Impedance: 94 Ω
Nominal Load Impedance: 10 kΩ
Minimum Load Impedance: 600 Ω
Nominal Output Level, +4 dBu Setting: +4 dBu ±1 dB
Nominal Output Level, -20 dBu Setting: -20 dBu ±1 dB
Maximum Output Level: +24 dBu

Balanced Inputs
Connectors: XLR-3-31 equivalent (4)
Pin Assignment: 1 ground, 2 hot, 3 cold
Input Impedance with All INPUT LINK Switches Off: 54 kΩ
Input Impedance with All INPUT LINK Switches On: 13.5 kΩ
Nominal Input Level, +4 dBu Setting: +4 dBu ±1 dB
Nominal Input Level, -20 dBu Setting: -20 dBu ±1 dB
Maximum Input Level, +4 dBu Setting: +30 dBu
Maximum Input Level, -20 dBu Setting: +8 dBu
Signal Indicator Detection Level, +4 dBu Setting: -24 dBu or higher
Signal Indicator Detection Level, -20 dBu Setting: -48 dBu or higher

Unbalanced Outputs
Connectors: RCA jacks (4)
Output Impedance: 200 Ω
Nominal Load Impedance: 10 kΩ
Minimum Load Impedance: 1 kΩ
Nominal Output Level: -10 dBV ±1 dB

Audio Performance
Frequency Response: 20 Hz to 100 kHz, ±3 dB at nominal input and output levels
Total Harmonic Distortion: 0.007% or less at 1 kHz, nominal input and output levels
Signal-to-Noise Ratio, A-Weighted: 90 dB at nominal input and output levels, 20 kHz low-pass filter, +4 dBu output setting
Signal-to-Noise Ratio, Band-Limited: 87 dB at nominal input and output levels, 20 Hz high-pass and 20 kHz low-pass filters, +4 dBu output setting
Channel Separation: 90 dB or greater at 1 kHz, nominal input and output levels, 600 Ω load
Level References: 0 dBV = 1 Vrms; 0 dBu = 0.775 Vrms

Power
Power Requirements: 100–240 V AC, 50/60 Hz
Power Consumption: 6 W
AC Convenience Outlet: Three-prong, independent of main power switch

Dimensions and Weight
Dimensions (W × H × D): 482.6 × 44.5 × 295 mm, including protrusions
Weight: 3.0 kg

Included Components
Line level converter
Region-specific power cord
Rackmount attachment screws, M5 (4)
Rackmount washers (4)
Owner’s manual