LD-2 Line Driver OPERATING INSTRUCTIONS OPERATING INSTRUCTIONS Superior engineering for the art and science of sound.
CONTENTS Safety Summary The LD-2 Line Driver: Introduction Audio Input AC Power Left And Right Channel Funtions Example Configurations Specifications LD-2 Signal Flow Diagram Front and Rear Panel Detail, Physical Dimensions Notes Contact Information 3 4 4 5 5 6 8 9 10 11 12 SYMBOLS USED THESE SYMBOLS INDICATE IMPORTANT SAFETY OR OPERATING FEATURES IN THIS BOOKLET AND ON THE CHASSIS.
! ENGLISH • To reduce the risk of electric shock, disconnect the unit from the AC mains before installing audio cable. Reconnect the power cord only after making all signal connections. • Connect the unit to a two-pole, three wire grounding mains receptacle. The receptacle must be connected to a fuse or circuit breaker. Connection to any other type of receptacle poses a shock hazard and may violate local electrical codes. • Do not allow water or any foreign object to get inside the unit.
THE LD-2 LINE DRIVER:INTRODUCTION Thank you for purchasing the LD-2 Line Driver, one of the two line-level distribution systems offered by Meyer Sound for integrating and optimizing our self-powered loudspeakers. The LD-2 allows system designers and operators to configure and control Meyer Sound self-powered full range, mid-hi, mid-bass, downfill, and subwoofer loudspeakers and any combination of these devices that may be required for real-world sound reinforcement or playback applications.
AUDIO INPUT The LD-2 presents a 10Ω balanced input impedance to a three-pin XLR connector wired with the following convention: Case — Earth (AC) ground and chassis Pin 1 — Earth (AC) ground and chassis Pin 2 — Signal Pin 3 — Signal The LD-2 is balanced in and out, and consequently has no hot (+) pin. Pins 2 and 3 carry the input as a differential signal. Use standard audio cables with XLR connectors for balanced signal sources.
LEFT AND RIGHT CHANNEL FUNCTIONS Each channel is equipped to control a full range main system. Each has a Signal/Mute-Clip LED indicator; mute switch; gain control; Mid-Hi, Mid-Bass or AUX, and Sub output controls; and a male XLR output connector for each output. The Master gain control sets the channel's overall level. The Mute switch mutes the entire channel. The bicolor Signal/Mute-Clip LED indicates input signal presence and level with a variable intensity green color, and clipping or mute with red.
EXAMPLE CONFIGURATIONS This section demonstrates the flexibility and utility of the LD2 with four sample applications. larger size does preclude tight-packing configurations with the MSL-4. The 650-P also lacks rigging hardware. LOUDSPEAKER PLACEMENT MSL-4, DS-2P/DS-4P, AND POLARITY The loudspeakers in the following configurations are in a close-proximity coplanar orientation, unless otherwise stated.
MSL-4 AND PSW-2 WITH CQ DOWN-FILL3 The correct polarity for the 650-P subwoofers is dependent on the height and distance of the measurement position relative to the subwoofers and the flown loudspeakers. This example shows the LD-2 used to integrate a system of self-powered loudspeakers for a larger venue. We recommend that the entire system be measured, phasealigned, and equalized using the SIM System II Sound Analyzer and CP-10 Parametric Equalizer.
LD-2 SPECIFICATIONS A r c h i t e c t u r e1 Master Left and Right Gain Controls Mid-Hi, Mid-Bass/Aux, Sub Gain Controls Low-cut Filter for Mid-High & Mid-Bass/Aux Output Array EQ Filter for Mid-Hi Output Mute Polarity Audio Inputs Connector Type Impedance Wiring RF Filter Common Mode Rejection Ratio Signal Presence/clip LED LED Threshold LED Full Intensity Audio Outputs A C Po w e r Audio Pe r f o r m a n c e GAIN RANGE GAIN RANGE Physical Notes 1 female XLR per channel Differential balanced input
LD-2 SIGNAL FLOW DIAGRAM LED SIGNAL & CLIP DETECTOR GRN RED MUTE SWITCHES RED Common mode: 425kHz low-pass Normal mode: 142kHz low-pass XLR 80dB CMRR Laser Trimmed 3 Input 10kΩ RF & ESD FILTER 1 Master Mute Switch DIFF AMP fc 2 Master Level Earth and Chassis GND -12 to +6dB Audio GND 10Ω on power supply board High Current Full range Flat Mid-Hi Level Mid-Hi Mute Switch XLR DIFFERENTIAL DRIVER Low-cut ArrayEQ Full range 2 Mid-Hi Output 1 High Current Polarity normal XLR DIFFER
FRONT AND REAR PANEL DETAIL, PHYSICAL DIMENSIONS All units in inches 3.45 16.75 19.00 The front of the LD-2, showing rack ears and corresponding space requirements 3.45 16.75 Rear 3.45 6.
CONTACT INFORMATION Meyer Sound Laboratories, Inc. 2832 San Pablo Avenue Berkeley, CA 94702 tel: 510.486.1166 fax: 510.486.8356 e-mail: info@meyersound.com www.meyersound.com 05.088.003.
