Emb Professional Sound System EBX99 Digital Crossover

The EMB Professional EBX99 is a rackmount electronic crossover designed to divide an audio signal into frequency bands for multi-amplifier or active-speaker sound systems. It is intended for home audio, DJ, club, studio, stage, and entertainment applications. By routing low, mid, high, and subwoofer content separately, it helps match system outputs to the speakers handling each range.

This processor is suited to users building a PA-style system with separate amplifiers or powered speakers for different frequency ranges. Stereo operation supports two-channel signal routing, while the summed left/right subwoofer mode provides a dedicated low-frequency output. Balanced connection support helps it fit into professional-style signal chains using compatible XLR or TRS cabling.

The EBX99 provides a stated frequency response of 20 Hz to 25 kHz with a +0/-1 dB tolerance. Its 24 dB-per-octave Linkwitz-Riley crossover filters are designed to create defined band separation between connected system components. Independent front-panel controls allow practical adjustment during setup and tuning.

Each main channel includes low-mid and mid-high crossover frequency controls, plus separate low, mid, and high output-level controls. A high-pass filter is provided on both channels to reduce very low-frequency content from the main signal path. Phase-reverse switching on the outputs can help address phase relationships between speaker sections.

The EBX99 is a system-control component rather than a powered amplifier, speaker, or source unit. It is positioned between a mixer, preamplifier, or other line-level source and the amplifiers or active speakers in a multi-way system. Its dedicated subwoofer section adds level and crossover-frequency adjustment for low-frequency integration.

Key Features

• Multi-Way Signal Routing: Separates audio for low, mid, high, and subwoofer system sections.
• 20 Hz–25 kHz Response: Covers the stated full-range operating response.
• Linkwitz-Riley Filters: Uses 24 dB-per-octave crossover filter slopes.
• Balanced Connections: Supports balanced TRS or XLR signal connections.
• Summed Subwoofer Mode: Combines left and right channels for subwoofer output.
• Phase-Reverse Switching: Allows phase inversion on all outputs.

Design & Installation

The EBX99 uses a black rackmount chassis with front-panel controls and a front power switch. Its layout groups Channel 1, subwoofer, and Channel 2 controls across the faceplate for direct access during setup. Stereo/mono status LEDs identify the selected operating mode.

Mount the unit in a standard 19-inch equipment rack or place it on a stable, ventilated surface. Connect a line-level source to the balanced inputs, then route the low, mid, high, and subwoofer outputs to compatible amplifiers or active speakers. Start with output levels reduced, set crossover points according to the connected speakers, and make gradual level and phase adjustments.