LD Systems LD X 223 - ACTIVE FILTER
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Manufacturer Information
LD Systems
https://www.adamhall.com
info@adamhall.com
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Adam Hall GmbH
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An Active Filter in Rack Format Designed for Classic Sound Reinforcement Setups
The LD Systems X223 is an analog crossover designed to provide reliable frequency splitting between your amplifiers and speakers. Its standard 19-inch 1U rack format facilitates integration into a flight case or technical rack, whether for live events, fixed installations, or FOH. The build quality, integrated power supply, and solid controls make it a particularly reassuring tool for regular use.
Who Is It For and What Are Its Uses?
This active filter is aimed at users who want to optimize a sound system by cleanly separating frequency bands: mobile DJs, sound providers, bands, equipped rehearsal rooms, small stages, places of worship, or installations with power amplifiers. In 2-way stereo, it efficiently manages a satellite + sub system (with a mono sub output). In 3-way mono, it becomes a relevant solution to separately feed lows, mids, and highs in a more structured configuration.
Audio Settings and Essential Functions for Quick Setup
The X223 emphasizes direct handling and useful adjustments in real conditions. You have a crossover frequency adjustment per channel to tailor the cutoff point to your speakers and the room acoustics, as well as input gains and LF/HF gains to balance amplifier and channel levels. The polarity inversion buttons help quickly resolve phase issues when aligning sub/top or between channels.
Linkwitz-Riley 24 dB/octave Filtering
The X223 uses a Linkwitz-Riley filter at 24 dB/octave, a standard appreciated in sound reinforcement for achieving coherent summation at the crossover point and clear separation between channels. This type of filtering helps improve clarity, bass control, and overall system definition, provided levels are well adjusted and speakers are properly placed.
Switchable 40 Hz High-Pass Filter
The switchable 40 Hz high-pass filters limit very low-frequency energy, often unnecessary or even problematic depending on the speakers, room, or music style. This is a practical feature to gain headroom, protect the system, and achieve tighter bass.
Balanced XLR Connectivity
The balanced inputs/outputs on XLR ensure clean integration with mixers, processors, and amplifiers in stage or installation environments, with better resistance to interference over long cable runs. The maximum input and output levels allow easy insertion into a professional audio chain.
Technical specifications
| U-height | 1 |
| Type | crossover (active filter) 2-way stereo / 3-way mono |
| Format | 19-inch rack, 1U |
| Model Name | LDX223 |
| Bandwidth | 20 Hz to 20 kHz, +0.5 dB |
| Frequency Response | below 3 Hz to above 90 kHz, +0 / -3 dB |
| Filter Type | Linkwitz-Riley, 24 dB/octave |
| Dynamic Range | 106 dB |
| THD+Noise | below 0.004% at 4 dBu, 1 kHz |
| Channel Crosstalk | below -80 dB, 20 Hz to 20 kHz |
| Inputs | female XLR |
| Maximum Input Level | +22 dBu (typical), balanced or unbalanced |
| Outputs | male XLR |
| Maximum Output Level | above +21 dBu, balanced or unbalanced |
| Dimensions (W x H x D) | 482 x 44.5 x 153 mm |
| Weight | 2.6 kg |
Questions frequently asked
Does the LD Systems LD X 223 support a system with a subwoofer?
In stereo 2-way mode, this active crossover separates the low and high frequencies, with a mono subwoofer output. The 24 dB/octave Linkwitz-Riley filter ensures a clean crossover between the bands.
Can this crossover be used in mono 3-way mode?
The mono 3-way mode allows separate driving of the lows, mids, and highs of a sound reinforcement system.
What type of connectors does the X223 active crossover use?
Inputs are female XLR and outputs are male XLR, with balanced or unbalanced connections. The maximum input level is typically +22 dBu. The maximum output level exceeds +21 dBu.
Does the X223 have a low-cut filter for infrasonic frequencies?
Switchable high-pass filters at 40 Hz limit very low frequencies. This feature helps reduce unnecessary energy below 40 Hz depending on the speaker configuration.
What are the rack dimensions of the LD Systems X223?
Its 19-inch rack chassis occupies 1U, measuring 482 x 44.5 x 153 mm and weighing 2.6 kg.
