Behringer CX3400 V2

Behringer CX3400 V2 Crossover — High-Precision Frequency Routing for Any PA

The Behringer Super-X Pro CX3400 V2 is a professional-grade active crossover designed to split a full-range audio signal into the precise frequency bands each loudspeaker needs. With three operating modes — stereo 2-way, stereo 3-way, and mono 4-way — this unit adapts to anything from a compact club PA to a multi-driver touring rig. The CX3400 V2 is the right choice for sound engineers and venue operators who need clean frequency separation, reliable driver protection, and flexible routing in a single rack unit.

Standout Features of the CX3400 V2

What separates this crossover from simpler 2-way units is its switchable CD horn pre-EQ, which raises the signal by 3 dB at 3.5 kHz and continues at 6 dB/octave up to 22.5 kHz to compensate for the natural efficiency loss of constant-directivity horns. A mono Low Sum output sums the left and right low-frequency signals into a single subwoofer feed, taking advantage of the fact that very low bass is perceived as omnidirectional. Each output also carries its own limiter, mute switch, phase-reverse switch, and gain control, so troubleshooting a misbehaving cabinet becomes a matter of flipping one button.

Filter Topology and Frequency Separation

The heart of any crossover is its filter slope, and the CX3400 V2 uses state-of-the-art Linkwitz-Riley filters at 24 dB/octave for steep, phase-coherent band separation. This slope keeps overlap between adjacent drivers to a minimum, so woofers, mids, and tweeters each receive only the spectrum they can reproduce cleanly.

• Filter Type: Linkwitz-Riley — industry-standard topology prized for flat summed amplitude response and zero phase difference at the crossover point.
• Filter Slope: 24 dB/octave — steep roll-off that minimises the overlap region where two drivers would otherwise compete.
• Operating Modes: Stereo 2-way, Stereo 3-way, Mono 4-way — one chassis covers the most common multi-amp configurations used in live sound.

Driver Protection and Phase Alignment

Beyond splitting frequencies, the CX3400 V2 actively protects the loudspeakers downstream and lets the engineer time-align the rig. A switchable 25 Hz low-cut filter on each input guards low-frequency drivers from sub-audible content, while adjustable time delay on each output compensates for the physical offset between drivers stacked at different heights.

• Output Limiters: Individual limiter on every output — catches peaks before they reach the amplifiers and protects the loudspeaker investment.
• Low-Cut Filter: 25 Hz, switchable per input — removes inaudible sub-bass that wastes amplifier headroom and risks driver damage.
• Time Delay: Adjustable per output — phase-aligns drivers that are physically offset, so the acoustic wavefront arrives at the listener coherently.

Connectivity, Power, and Build

The rear panel is built around servo-balanced, gold-plated XLR connectors for every input and output, keeping the signal path quiet over long cable runs. An internal switch-mode power supply accepts 100–240 V worldwide mains, and the whole unit fits into a single 1 RU rack slot.

• Audio I/O: 2x XLR line inputs, 6x XLR line outputs — enough head-end connections to feed a stereo 3-way rig plus a mono sub send.
• Power Supply: Internal switch-mode, 100–240 V worldwide operation — no voltage selector to worry about on international tours.
• Chassis: 1 RU metal enclosure, 48.3 x 21.6 x 4.45 cm, 2.5 kg — slides into any standard rack and survives the road.

Who Is It For

The CX3400 V2 fits the rack of any sound engineer running a multi-amplifier PA — from a small club or house-of-worship system up to a larger hall with subwoofers and stage monitors. It is the right choice for live-sound operators who need Linkwitz-Riley-grade filter slopes, individual output limiters, and phase-alignment delay without paying flagship prices. Studio owners adding a subwoofer to their monitor chain will also find the Low Sum function and 25 Hz high-pass useful for clean low-end integration.