Meyer Sound LD-3

Atmospheric Correction ( Affects Output Channels 1-3, Both A&B)
Temperature: 0° to 45° Celsius
Relative Humidity: 10 to 100% RH
Altitude: 3 position switch: 0 to 800, 800 to 2200, 2200 and up
Distance: See “Outputs: Channels 1-3 (A&B)”

Array Correction:
Type: M1D, M2D, MILO, M3D, upgradable Remote Setting
Array Size: 1 to 24 Elements in the array (If set to 1 element, bypasses array correction)

Master Inputs:
Attenuation Control: -12dB to +6dB
Mute: Master mute, controls output mutes

Outputs: Sub Out
Attenuation Control: 6 to +6 dB
Mute: Mutes at the output stage
Polarity Switch: Toggles the polarity of the sub output
Low-Pass Filter/Crossover: 3 position switch: OFF, 55 Hz and 80 Hz
Insert Switch: When switch is “in” it disconnects Master signal from Sub signal path and allows only Sub Insert/Return XLR to drive Sub signal path. When switch is “out” the Master signal and Sub Insert XLR are summed onto the Sub signal path. Master signal is muted if switch is “in” and no signal is present at Sub Insert. Sends and Inserts operate 3 dB lower than Master signal, therefore signals applied to Sub Insert XLR will have 3 dB greater gain through LD-3
Signal/Clip Indicator: Glows green with signal and red when output is in clipping

Outputs: Channels 1-3 (A&B)
High-Pass Filter/Crossover: 3 position switch: OFF, 80 Hz and 160 Hz. Affects all 3 channel outputs
Attenuation Control: -6 to +6 dB (-6 to -3 and +3 to +6 settings not recommended to preserve array behavior)
Distance: 1 to 150 m; works in conjunction with the Atmospheric Correction section (If set to 0 m, bypasses atmospheric correction)
Mute: Mutes at the output stage
Insert Switch: Toggles the input from Master to Insert/Return. Not normalized, mutes channel when engaged if no signal is present at Insert/Return
Signal/Clip Indicator: Glows green with signal and red when output is in clipping
Maximum Correction Indicator: Glows when the correction has reached 16 dB at 16 kHz

Audio Inputs
Type: Differential balanced input circuit
Impedance: 10 kΩ differential (between pins 2 and 3)
Wiring: Pin 1: chassis/earth ground; Pin 2: signal (+); Pin 3: signal (-)
RF Filter: Common Mode: 425 kHz low-pass, Differential Mode: 142 kHz low-pass
Common Mode Rejection Ratio: >80 dB (typically 90 dB); measured in the range 50 Hz - 1 kHz
Signal Presence: LED (Variable intensity; monitored at the input for each channel) Threshold: -26 dBV (50 mV rms) pink noise or sine wave Full Intensity: -10 dBV (300 mV rms) pink noise or sine wave

Input Connectors:
Master A & B: 2 Female XLR; 1 per input channel
Insert/Return: Sub Input: 2 Female XLR; 1 per input channel
Channels 1-3 (A&B): 6 Female XLR; 1 per input channel; Insert is Pre-Atmospheric, Correction / Post-High Pass Filter/Crossover

Audio Outputs:
Type: Balanced, cross-coupled simulated transformer topology
Impedance: 50 Ω balanced (between pins 2 and 3)
RF Filter:
Pins 2 and 3 shunted to chassis via 500 pF capacitance
Wiring: Pin 1: chassis/earth ground; Pin 2: signal; Pin 3: signal

Drive Capability
Maximum Voltage: 600 Ω Load: ±17.8 V pk (+22 dBV, +24.2 dBu sine wave); No Load: ±19 V pk (+22.5 dBV, +24.7 dBu sine wave
Maximum Current: ±70 mA pk (10 V rms into 200 Ω)
Cables and Load: >100,000 pF (> 1000 ft cable) without instability or distortion

Output Connectors:
Sub Output: 2 Male XLR; 1 per output channel
Channels 1-3 (A&B): 6 Female XLR; 1 per output channel
Full Range Pre Send output: 2 Male XLR; 1 per output channel; Send is Pre-Array, Pre-Atmospheric correction
Full Range Post Send output: 2 Male XLR; 1 per output channel; Send is Post-Array, Post-Atmospheric correction
Post Array and HPF: 2 Male XLR; 1 per output channel; Send is Post-Array, Post-Atmospheric correction and Post High-Pass filter/Crossover

Audio Performance
Frequency Response: <±0.2 dB 20 Hz - 20 kHz (All corrections disabled)
Dynamic Range: >110 dB
Noise Floor: >-90 dBV A-weighted; >-88 dBV un-weighted
THD: <0.02% (typically 0.005%)
Gain Accuracy: <±0.15 dB at +6 dB gain; <±0.25 dB at 0 dB gain
Mute Attenuation: >88 dB

AC Power
Connector: IEC 320 (line, neutral/line, earth)
Operating Voltage: 105 - 125 V AC, 210 - 250 V AC (selectable with rear panel switch); 50/60 Hz
Maximum Power: 25 W; Fuse: 5 x 20 mm, T 250 mA, 250 V, time-lag