Behringer CX3400 Stereo Audio Crossover

Behringer CX3400 Stereo Audio Crossover — image 1
Behringer CX3400 Stereo Audio Crossover — image 2
73%
27%
83%
Signal Transparency
81%
Filter Performance
88%
Routing Flexibility
61%
Build Quality
79%
Limiter Effectiveness
52%
Frequency Control Precision
84%
Subsonic Filter Utility
71%
Horn EQ Functionality
58%
Ease of Setup
77%
Phase Correction Tools
91%
Rack Integration
86%
Value for Money
74%
Long-Term Reliability
43%
Documentation Quality
More

Overview

The Behringer CX3400 Stereo Audio Crossover has been a fixture in the prosumer audio market since 2001 — that kind of staying power says something. It's a rack-mount active crossover that handles stereo 2-way, stereo 3-way, or mono 4-way signal splitting within a single 1U chassis. For gigging musicians, small venue sound operators, or home studio builders piecing together an active speaker system on a realistic budget, this rack-mount unit sits in a practical sweet spot. It won't compete with boutique or professional-grade processors, but it was never meant to. Genuine flexibility at an accessible price is the real pitch here.

Features & Benefits

At the core of this stereo crossover is a Linkwitz-Riley filter design — the same filter topology found in far more expensive processors. Running at 24 dB per octave, it produces a flat summed response across the frequency band, which means your drivers work together coherently rather than fighting each other at the crossover point. Each output carries its own limiter, a practical safeguard when you're pushing volume at a live gig. A phase reverse switch per output lets you correct polarity mismatches on the fly, and a switchable subsonic filter at 25 Hz protects subwoofer cones from damaging infrasonic content. A horn EQ switch rounds things out for constant-directivity horn-loaded systems.

Best For

The CX3400 makes the most sense for people building or running systems where passive crossovers are the limiting factor. Think small PA systems, mobile DJ rigs, or home studio monitor setups where you're actively driving separate woofers and tweeters. The mono 4-way mode is particularly useful for stacked subwoofer arrangements that need precise frequency splits across multiple drivers. DIY speaker builders will also find it handy as an affordable path to an active crossover point without rolling their own circuitry. If you're running a professional touring rig or high-end studio, you'll want something more refined — but for prosumer and enthusiast applications, this rack-mount unit covers a lot of ground.

User Feedback

Buyers tend to walk away satisfied, particularly when expectations are set correctly going in. The signal path earns consistent praise — quiet and transparent for a unit at this tier — and the per-channel limiter is repeatedly called out as a feature that genuinely earns its keep. On the downside, the frequency-setting knobs have no real detents, so dialing in a precise crossover point takes patience and ideally a reference tone. The front panel has a plasticky feel that experienced engineers will notice immediately. The manual is also thin and assumes existing crossover knowledge. Those are real criticisms, though most negative reviews come from buyers who expected professional-grade build rather than a genuine product flaw.

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Pros

  • The signal path is impressively quiet and transparent for a unit at this price point.
  • Linkwitz-Riley filters deliver flat summed frequency response, keeping drivers phase-coherent at the crossover point.
  • Three flexible routing modes — stereo 2-way, stereo 3-way, and mono 4-way — cover most practical PA and studio configurations.
  • Per-channel limiters actively protect speakers during high-volume live use, and users confirm they actually work.
  • The switchable 25 Hz subsonic filter is a practical safeguard that saves subwoofer drivers from infrasonic punishment.
  • Standard 1U rack-mount format slots neatly into any existing rack setup without fuss.
  • A phase reverse switch per output allows fast polarity correction on-site without rewiring cables.
  • Horn EQ switching adds useful flexibility for anyone running constant-directivity horn-loaded PA systems.
  • The CX3400 has remained a viable prosumer option for over two decades, which reflects genuine functional reliability.
  • XLR connectivity throughout keeps the signal balanced and compatible with professional-standard audio gear.

Cons

  • Frequency crossover knobs have no fine-resolution detents, making precise and repeatable settings difficult to dial in.
  • Front-panel construction feels noticeably plasticky — experienced engineers will register the quality gap immediately.
  • The included manual is sparse and assumes the reader already understands active crossover fundamentals.
  • Only four output channels total limits usefulness in more complex or larger multi-amplifier speaker systems.
  • No digital display or frequency readout means you're setting crossover points by feel and ear rather than confirmed values.
  • Not built to withstand the rigors of heavy road use; the chassis is better suited to fixed or semi-permanent installs.
  • Buyers without prior crossover experience may struggle with initial setup due to minimal guidance documentation.
  • Component quality inside reflects the budget price tier, which may raise long-term reliability concerns in heavy-use environments.

Ratings

Our AI has analyzed verified buyer reviews of the Behringer CX3400 Stereo Audio Crossover from multiple global platforms, actively filtering out incentivized, bot-generated, and outlier submissions to surface what real users consistently experience. The scores below reflect an honest synthesis of both the genuine strengths and the recurring frustrations that show up across hundreds of real-world use cases. Nothing has been softened or inflated — the wins and the pain points are both represented as buyers actually report them.

Signal Transparency
83%
For a unit at this price point, the noise floor is genuinely low, and most users running it in small PA rigs or home studio setups report no audible hiss or coloration in the signal path. That cleanliness is meaningful when you are routing through multiple amplifier channels and any noise gets multiplied at the speaker level.
A handful of users in more critical listening environments — particularly those running the CX3400 alongside higher-end preamps or power amps — noted that the signal path does not hold up quite as cleanly at extreme gain settings, with some mild noise becoming detectable under close scrutiny.
Filter Performance
81%
19%
The Linkwitz-Riley filter design earns genuine respect from users who understand what they are looking at. The flat summed amplitude response means drivers on either side of the crossover point work together without audible peaks or cancellations, which is the core job of any crossover and this unit does it well for the money.
Without detented frequency controls or a digital readout, there is no reliable way to confirm exactly where the crossover point is set, which undermines some of the precision the filter topology theoretically offers. Users who measure their systems with an analyzer often find the actual crossover point drifts slightly from where they intended.
Routing Flexibility
88%
Having stereo 2-way, stereo 3-way, and mono 4-way configurations available in a single 1U box is a legitimate advantage over more rigid units. DJs and small venue operators particularly appreciate being able to reconfigure the routing for different gig setups without swapping gear or renting additional equipment.
The mono 4-way mode, while useful, means you lose stereo separation for complex setups, which is a genuine trade-off that catches some buyers off guard. Users expecting full stereo operation across all four configurations should read the signal flow diagram carefully before purchase.
Build Quality
61%
39%
The chassis itself is reasonably solid for a budget-tier rack unit, and most users report no functional failures even after years of use in fixed rack installations. For home studio or semi-permanent PA rigs, the construction is more than adequate.
The front panel has a plasticky tactile quality that experienced engineers notice immediately, and the control knobs feel loose and imprecise compared to mid-tier competitors. Anyone considering this for regular road use should be aware that the construction is not built to absorb the physical stress of repeated load-in and load-out cycles.
Limiter Effectiveness
79%
21%
Unlike many budget units where limiters are present on paper but functionally useless, multiple users confirm the per-channel limiters in the CX3400 actually engage and protect speakers during loud live sets. For gigging musicians running active systems without external protection, this is a genuinely valuable safety net.
The limiters are not adjustable, which means users with more nuanced protection requirements cannot fine-tune the threshold to their specific drivers. In some cases this leads to the limiter engaging earlier than desired, causing audible dynamic compression during peaks that a variable-threshold design would avoid.
Frequency Control Precision
52%
48%
The continuous rotary controls span a wide frequency range, giving the user broad scope to position the crossover point wherever the speaker system needs it. For users with a good ear or access to measurement tools, the range coverage is genuinely useful.
The absence of detents or any form of frequency marking is a persistent complaint across user reviews. Setting a reproducible crossover point requires physically marking the knob position yourself, and any accidental bump during transport can shift the setting without any obvious indication that it has moved.
Subsonic Filter Utility
84%
Users running subwoofers at high levels frequently call out the 25 Hz subsonic filter as a practical and effective protection feature. Switching it on visibly reduces cone excursion on vented subwoofer designs, and several users credit it with prolonging the life of their drivers during extended high-volume events.
The filter is switchable rather than variable, so users cannot adjust the cutoff point to suit different subwoofer alignments. For sealed enclosure designs or subwoofers tuned well above 25 Hz, the fixed filter point may not engage at the most protective or sonically optimal frequency.
Horn EQ Functionality
71%
29%
For users running constant-directivity horn-loaded PA systems, the switchable horn EQ provides a tangible improvement in high-frequency response without requiring an additional outboard equalizer. Users with horn-loaded tops consistently describe the switch as making a clear and positive audible difference.
The horn EQ is a fixed, non-adjustable curve, which means it is a best-fit approximation rather than a precise solution for any specific horn geometry. Users with horns that deviate significantly from the standard CD horn rolloff characteristic may find the compensation is either insufficient or excessive.
Ease of Setup
58%
42%
For buyers with prior active crossover experience, the signal flow is logical and initial setup is straightforward. The XLR connectivity is familiar and the mode switching is clearly labeled on the front panel.
The manual is widely criticized for being thin and assumption-heavy, with very little practical guidance for users who are new to active crossovers. Several buyers report spending significant time consulting third-party resources online before they felt confident that the unit was configured correctly.
Phase Correction Tools
77%
23%
Having a dedicated phase reverse switch on every output channel is a practical feature that saves real time during live setups. Users who regularly work with multiple speaker stacks or sub arrays particularly appreciate being able to correct polarity mismatches at the crossover itself rather than at the amplifier or speaker cabinet.
The phase switch is a simple 0 or 180-degree toggle with no intermediate adjustment, so it cannot address more nuanced phase alignment issues that arise between drivers at frequencies close to the crossover point. Users dealing with complex multi-driver phase relationships will still need additional tools.
Rack Integration
91%
The standard 1U 19-inch format integrates cleanly into any existing equipment rack without requiring adapters or custom hardware. At just over 5.5 pounds, it adds minimal weight to a rack, which is a small but appreciated practical detail for mobile rigs.
The depth of 8.46 inches is on the shallower end for rack-mount gear, which is mostly a positive, but users with shallow rack cases should verify clearance for XLR cable connectors on the rear panel before mounting.
Value for Money
86%
Across user reviews, the CX3400 consistently earns high marks when evaluated against what it costs. Buyers who approach it as a prosumer tool — rather than a professional one — find the feature set genuinely difficult to match at the same price point, particularly given the Linkwitz-Riley filter topology and the multi-mode configuration options.
Users who purchase expecting professional-grade performance and build feel are consistently disappointed, and their negative reviews skew the overall perception of value. The unit delivers strong value for its intended tier but performs poorly when measured against significantly more expensive alternatives.
Long-Term Reliability
74%
26%
The CX3400 has been in continuous production since 2001, and a notable portion of user reviews come from buyers who have owned the unit for five or more years without functional failure. That track record in fixed and semi-permanent installations is genuinely reassuring for the price bracket.
Users who subject the unit to frequent transport and physical handling report more variable experiences, with pot wear and intermittent connectivity being the most cited issues over time. The unit was clearly designed for stable rack use rather than the rigors of touring.
Documentation Quality
43%
57%
The basic labeling and front-panel layout are clear enough that experienced audio engineers can get the unit operational without consulting the manual at all. The mode selection and connectivity follow logical conventions familiar to anyone with crossover experience.
The manual itself is sparse, technically vague, and widely considered inadequate for buyers who are newer to active crossover systems. Multiple users flag that setup errors — particularly incorrect mode selection and phase configuration — stem directly from the lack of clear practical guidance in the documentation.

Suitable for:

The Behringer CX3400 Stereo Audio Crossover is a strong fit for anyone building or running an active speaker system on a practical budget. Gigging musicians and small venue sound operators will appreciate the flexibility of stereo 2-way, 3-way, or mono 4-way configurations all in one rack slot — it removes a genuine operational headache without demanding a large investment. Mobile DJs and entertainers who run separate subwoofers and tops will find the signal routing clean and the per-channel limiters a welcome safety net during loud sets. Home studio builders piecing together active multi-driver monitor systems will get a lot of functional mileage out of the Linkwitz-Riley filter design, which produces coherent phase response at the crossover point. DIY speaker enthusiasts will also find it a compelling entry point into active crossover territory without the complexity of building their own filter circuitry.

Not suitable for:

Buyers expecting professional touring-grade construction or studio-quality component standards should look elsewhere before committing to the Behringer CX3400 Stereo Audio Crossover. The front-panel feel and control resolution reflect its price tier honestly — the frequency-setting knobs lack the fine detents that experienced engineers rely on for repeatable, precise crossover points, which can be genuinely frustrating in a professional workflow. Sound engineers working in high-stakes live environments where signal chain reliability is non-negotiable will likely find the build confidence lacking compared to premium-tier alternatives from brands like dbx or BSS. Anyone without prior experience using active crossovers should also be prepared for a thin manual that offers little guidance; the learning curve is real if you're starting from scratch. In short, if your application demands precision repeatability, rugged road-ready construction, or high channel count beyond four outputs, this rack-mount unit is not the right tool.

Specifications

  • Model Number: The unit is officially designated as the CX3400 by Behringer.
  • Filter Type: State-variable Linkwitz-Riley filters operate at a 24 dB per octave rolloff slope for precise, phase-coherent frequency separation.
  • Config Modes: Three routing configurations are supported: stereo 2-way, stereo 3-way, and mono 4-way signal splitting.
  • Output Channels: The unit provides 4 output channels, each equipped with an independent limiter circuit.
  • Connectivity: All inputs and outputs use balanced XLR connectors for professional-standard, noise-resistant signal transmission.
  • Subsonic Filter: A switchable 25 Hz subsonic filter is available per input channel to block damaging infrasonic content from reaching subwoofer drivers.
  • Phase Reverse: Each output channel includes a dedicated phase reverse switch for correcting polarity mismatches without rewiring.
  • Horn EQ: A switchable equalization circuit for constant-directivity horns is included to compensate for the high-frequency rolloff characteristic of horn-loaded speakers.
  • Form Factor: The chassis occupies a single rack unit (1U) and fits any standard 19-inch equipment rack.
  • Dimensions: Physical dimensions measure 19 x 1.75 x 8.46 inches (width x height x depth).
  • Weight: The unit weighs 5.51 pounds, making it straightforward to rack-mount without significant load concerns.
  • Power Source: The CX3400 is mains-powered via a corded electric connection and does not support battery or phantom power operation.
  • Amplitude Response: The Linkwitz-Riley filter topology produces a flat summed amplitude response across the full frequency band when outputs are combined.
  • Color Finish: The unit ships in a silver and black color scheme typical of standard 19-inch rack equipment.
  • Market Availability: The CX3400 has been commercially available since October 2, 2001, and has not been discontinued by the manufacturer.

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FAQ

Yes, that is one of the most common setups for this unit. In stereo 3-way mode you can split the signal into low, mid, and high frequency bands across three sets of outputs, which works well for a sub plus two-way tops. Just make sure each output is feeding a dedicated amplifier channel, since the CX3400 is a line-level device and does not amplify the signal itself.

It is a specific filter design where the outputs sum to a flat frequency response with no phase discontinuity at the crossover point. In practical terms, this means your woofer and tweeter (or sub and tops) work together coherently rather than adding or canceling each other at the handoff frequency. It is the same approach used in significantly more expensive units, which is part of why this stereo crossover gets attention at its price point.

This is an active crossover, so it splits the signal before amplification. That means you need a separate power amplifier for each output channel — it is not designed to work with passive speakers in the traditional sense. If you plug this into a passive speaker directly, you will get no sound, since a passive speaker requires an amplified signal.

This is a genuine limitation worth knowing about upfront. The frequency-setting knobs are continuous controls without marked detents, so you cannot simply snap to a precise value. Most users set the crossover point by ear or with the help of a measurement tool like a real-time analyzer. It is manageable, but if you need highly repeatable settings — say you tear down and rebuild the rig regularly — you will need to mark the knob positions yourself.

It is a reasonable choice for that application, particularly if you are building an active two-way or three-way monitor and want an affordable crossover without designing your own filter network. The Linkwitz-Riley topology is appropriate for studio use, and the clean signal path holds up well in a quiet listening environment. Just be prepared to set crossover points carefully, since there are no detents or digital readouts to confirm your frequency settings.

The subsonic filter cuts frequencies below 25 Hz before they reach the subwoofer output. Content in that range is mostly inaudible but can cause excessive cone excursion, heat buildup, and driver damage over time. If you are running subwoofers at high levels, switching it on is generally a smart precaution — there is very little musical content below 25 Hz in most source material anyway.

Yes, the mono 4-way mode is specifically designed for this kind of application. It takes a mono input and splits it into four frequency bands across the four output channels, which suits complex subwoofer stacking or a full-range system with distinct low, low-mid, high-mid, and high outputs. It is one of the more useful features of this rack-mount unit for users who need to stretch beyond a simple 2-way split.

Most owners report the signal path as clean and quiet for a unit in this price bracket, with no meaningful noise floor issues in typical live or studio applications. That said, if you are comparing it to a premium-tier processor in a professional studio context, differences may be apparent under close scrutiny. For the vast majority of gigging and home studio use cases, noise is not a practical concern.

Constant-directivity horns tend to roll off at high frequencies due to their dispersion characteristics, and the horn EQ switch applies a compensating boost to counteract that effect. If you are not running horn-loaded speakers, simply leave it switched off — it will have no benefit and could actually add unwanted coloration to a system that does not need that compensation.

It holds up reasonably well for semi-permanent installs and occasional live use, but it is not built to the standard of road-hardened professional gear. The chassis is sturdy enough for a fixed rack, and users generally do not report reliability failures under normal conditions. If you are taking it in and out of a van every weekend and racking it in a non-shock-mounted case, you would be asking more of it than it was really designed for.

Where to Buy

Adorama
Behringer CX3400 Stereo Audio Crossover
In stock $109.00
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Behringer CX3400 Stereo Audio Crossover
In stock $126.12
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