MSL-3A Reinforcement Loudspeaker 70°H 60°V 21 1/4" wide 56 3/4" tall 30" deep 241 lbs (109.3 kg) Max SPL (Peak/Cont): 135/130 Freq Range: 75-18 kHz
Features High power High clarity and coherence Arrayable Rugged Long-term reliability	Applications Main PA arrays Concert reinforcement Theater sound reinforcement Live music club systems High-power announcing Paging indoors/outdoors

Designed to perform in a wide range of large-scale sound reinforcement applications, the high-power, arrayable MSL-3A allows for coherent, controlled coverage of wide areas in theater, club and concert reinforcement. The efficient loudspeaker delivers high sound pressure levels with extremely low distortion, for maximum intelligibility and fidelity.

The biamplified loudspeaker consists of two proprietary 12-inch low-frequency cone drivers in a unique horn-loaded, vented enclosure and a single high frequency driver with a 70-degree horn. The rugged, multiple-ply hardwood cabinet is fitted with handles and optionally, aircraft-style rigging pan fittings.

The MSL-3A requires a high-quality professional stereo power amplifier capable of delivering up to 400 watts/channel continuously into 4 ohms, with a signal voltage gain of 10 dB (minimum) to 30 dB (maximum).

The MSL-3A loudspeaker operates as a system with the M-3A Control Electronics Unit (one per channel). Optimized for the MSL-3A and pre-aligned at the factory, the M-3A contains frequency response and phase response alignment circuitry, and Meyer Sound's exclusive SpeakerSense™ driver protection circuitry, incorporating both peak and RMS signal limiting.

A single-channel device operating at line level, the M-3A is intended to be the final component in the signal chain before the power amplifier. Its factory-calibrated SpeakerSense circuitry protects the MSL-3A loudspeaker components from damage due to overheating under high power conditions. This unique circuit continuously monitors the power applied to the MSL-3A drivers and individually limits the high-frequency and low-frequency outputs when the safe operating limits of the drivers are exceeded.

Until the onset of overload, the SpeakerSense circuitry has no effect on the signal. Also provided is a switch-selectable Safe function which widens the safety margin of the system by decreasing the SpeakerSense limiting threshold 6 dB and is intended to be used when extended periods of overload are anticipated.

To enhance the effectiveness of the MSL-3A in voice reinforcement applications, the M-3A incorporates filters which band-limit the system response under full-power conditions. This has the effect of increasing intelligibility by discriminating for vocal information in the signal. In music reinforcement applications, the Meyer Sound DS-2 Mid-Bass Loudspeaker and 650-R2 Concert Subwoofer are recommended to extend the system's low-frequency response and power bandwidth.

MSL-3A Specifications

Footnotes:

1. Measured 1 meter on axis, half-space conditions, pink noise input, in third-octave bands.
2. Loudspeaker driven with "A" weighted noise (peak-to-RMS ratio approximately 12 dB), with power amplifier rated at 400W per channel at 4 ohms.
3. ISO™ Input: Pins 1, 2 and 3 are transformer-isolated and shell is connected to chassis/AC earth ground. Pin 3 positive for positive pressure output.
4. 800 Hz (worst case frequency both channels), < 0.1% THD.
5. "A" -weighted, unbalanced.
6. "A" -weighted noise floor to maximum output at 800 Hz.