ESB Audio 5.6K3X — 5000 Series 3-Way Speaker System with Crossover (5.165 + 5.050 + 5.028)

ESB Audio 5.6K3X — 5000 Series 3-Way Speaker System with Crossover (5.165 + 5.050 + 5.028)

The 5.6K3X is the complete ESB 5000 Series three-way system with separately mounted drivers: a pair of 5.165 6.5-inch mid-woofers, a pair of 5.050 50 mm soft dome midranges, a pair of 5.028 28 mm soft dome tweeters, and the matched 5.6K3 CX passive crossover.

Three drivers per side, one amplifier channel per side to drive them.

Why Three Ways Changes the System

The vocal range is the reason.

In a two-way, everything from the woofer's high-pass to around 2 kHz comes from a 6.5-inch driver mounted low in a door, working into a cavity the manufacturer never designed as an enclosure. Voices originate down by the listener's knee and arrive coloured by the door.

The 5.6K3X moves that band onto a 50 mm dome that can be mounted at or near ear height in a proper sealed volume. The stage rises, the vocal range gets easier to place, and the woofer is left doing the one thing a door-mounted 6.5-inch driver does well.

The Crossover Design

The 5.6K3 CX divides at 900 Hz and 3.6 kHz, with a different filter order on each section:

• 12 dB/oct Butterworth low-pass on the 5.165
• 6 dB/oct band-pass on the 5.050
• 12 dB/oct Butterworth high-pass on the 5.028

The shallow band-pass on the midrange is a deliberate choice. A gentler filter lets the dome overlap generously with the woofer below and the tweeter above, blending through the region where the ear is most sensitive to discontinuity rather than handing off abruptly. It works because the 5.050 has bandwidth to spare on both sides — rated 600 Hz to 5 kHz for a job spanning 900 Hz to 3.6 kHz.

Every crossover point sits inside what the drivers are rated for at the slopes used. Film capacitors — polypropylene or Mylar — hold their values as they age, which matters more here than in a two-way because two crossover points and more components define the response.

Independent Level Trim

The network provides two adjustments: midrange at 0 or −2 dB, tweeter at 0 or −3 dB.

This is the practical advantage of a three-way passive network over a two-way. In a two-way the only balance available is bass against treble. Here the vocal range can be set relative to both — forward in one vehicle, recessed in another, corrected at the crossover.

Set both by ear in the vehicle with the doors closed. They interact: pulling the midrange down changes how the tweeter reads.

The Drivers

5.165 mid-woofer: 3Ω, 160 W continuous / 320 W peak, carbon fibre reinforced composite exponential cone at 12.1 g moving mass, FEA-optimized Y35 ferrite motor with a pure copper ring, TSW rubber surround, oversized Conex spider.

5.050 midrange: 4Ω, 120 W continuous / 240 W peak, 50 mm composite dome on an oversized neodymium motor, CNC 7000 aluminium and brass body, dB Cloth under-dome damping.

5.028 tweeter: 4Ω, 110 W continuous / 220 W peak, 28 mm composite dome, neodymium motor, 28 mm voice coil on an aluminium former.

Both domes use vented motors whose calibrated-hole filters lower the impedance peak at resonance — which is precisely what lets a passive network behave predictably near its crossover points.

System Application

A three-way front stage from one amplifier channel per side. A good two-channel amplifier drives the pair, leaving the rest of the system's power for the subwoofer — which is required, as the 5.165 is rated from 80 Hz behind this network's 12 dB/oct high-pass.

Where only one mid-high location per side is available, the 5.6K3UX is the same system using the 5.UMA, which puts this midrange and tweeter on one flange.

Installation Considerations

Plan three locations per side before cutting. Vertical spread between the midrange and tweeter matters here more than in an active system, because there is no delay available to correct a large path difference — keeping them reasonably close and at similar height is worth doing.

Give the 5.050 a sealed volume or free air. Do not share the door cavity with the woofer.

Check the 5.165's 68–76 mm mounting depth, and treat the doors.

Six conductors per side leave the network. Check polarity on all three drivers — a reversed midrange creates cancellation at two crossover points rather than one, and the resulting hole is easily mistaken for a faulty driver.

The network measures 136 × 99 × 35 mm and accepts cable to 4.5 mm (6 AWG). Mount it with the level switches reachable.

Specifications

• Configuration: 3-way component system with passive crossover, sold as a pair
• Mid-woofer: 5.165 · 6.5"/165 mm · 3Ω · 160W continuous / 320W peak
• Midrange: 5.050 · 2"/50 mm soft dome · 4Ω · 120W continuous / 240W peak
• Tweeter: 5.028 · 1.1"/28 mm soft dome · 4Ω · 110W continuous / 220W peak
• Crossover: 5.6K3 CX included · 900 Hz / 3.6 kHz · 300W
• Level trim: midrange 0 / −2 dB · tweeter 0 / −3 dB
• Amplifier channels required: 1 per side (2 total)
• Sensitivity: 92 dB (woofer) · 91 dB (midrange and tweeter) @ 1W/1m

HF Audio Perspective

A well-designed passive three-way is an underrated thing, and this is one.

The received wisdom is that a three-way belongs on a DSP, and there is truth in it — active operation allows a 600 Hz crossover to the midrange where this network uses 900 Hz, and provides delay to reconcile three arrival times. Those are real advantages.

What gets left out is what a passive three-way delivers in return. It needs two amplifier channels instead of six, which changes what the rest of the build can afford. It arrives with the crossover points already chosen against the driver datasheets by someone who read them. And it cannot be mistuned — a badly tuned active three-way sounds worse than a correctly executed passive one, and tuning a three-way properly requires measurement and time that not every build gets.

The drivers here are the same ones in every other 5000 Series configuration. If the system goes active later, they carry forward and this network comes out. Bought as a system to be installed once and enjoyed, it is a complete and coherent answer — provided the doors get treated, a subwoofer goes underneath, and the two level switches get set by ear rather than left at default.