Both the M552 and M553 Electronic Crossovers give you "constant directivity horn pre-emphasis," a special equalization curve that optimizes the audio signal for JBL Bi-Radial® horns. The result is a system that delivers balanced power response across both the horizontal and vertical planes for superb coverage.

The M644 Noise Gate has four discrete channels of gating with user-adjustable Threshold, Attack, and Release.

The M712 Gating Compressor/Limiter features "Soft-Knee" compression characteristics for transparent gain control.

All four devices incorporate Servo-Balanced outputs for proper gain matching and elimination of extemporaneous noise.

Key Features:

• Constant-Directivity horn pre-emphasis allows for smooth, flat frequency response from JBL 2360 Series and 2380 Series Flat-Front Bi-Radial® horns, or other CD horns.
• 24 dB Linkwitz-Riley filters generate seamless transitions between loudspeaker components for improved high frequency driver protection as well as reduced lobing and phase distortion.
• LF summing combines both channels for subwoofer applications where only one mono channel is needed.
• Servo-balanced outputs provide automatic output level adjustment to accommodate either balanced or unbalanced feeds.
• Outstanding 117 dB dynamic range for lowest noise and greater headroom, resulting in superb transient response.
• Extremely low distortion: THD 0.004%.
• Wide bandwidth, flat response; 10 Hz to 75 kHz.
• Subsonic filtering for protection of low frequency transducers from over excursion.
• RF filtering to defeat extraneous noise and ultrasonic oscillations.
• External ground link terminals for independent access to signal and chassis grounds, permitting greater flexibility in system grounding.
• XLR input and output connectors.

note:  0 dBu = .775V; 0 dBm = 1 mW