The DE52 is the 1.4-inch exit version of the DE550 platform — same 51 mm coil, same HT polymer diaphragm, same replacement diaphragm (MMD5508). 1.8 T neo, 108 dB, 70 W AES / 140 W program, 1–17 kHz. And the headline: 1 kHz recommended crossover — the lowest of any compression driver in B&C’s entire range. 2.8 kg, 134 mm body, 60 mm deep. Four M6 on 76 mm bolt circle. 8 Ω only.
B&C DE52 – Lowest-Crossover 1.4-Inch Compression Driver with HT Polymer Diaphragm and 51 mm Voice Coil
The B&C DE52 is the 1.4-inch exit compression driver with the lowest recommended crossover frequency in B&C’s entire HF range. At 1 kHz — lower than any other B&C compression driver regardless of exit size — the B&C DE52 hands off from the woofer earlier than any other driver in the catalogue. Combined with 108 dB sensitivity, 70 W AES / 140 W program power handling, a 51 mm voice coil, and the HT polymer diaphragm shared with the DE550, it delivers a combination of low-frequency authority, sustained power, and smooth treble character that positions it as the most capable HT polymer 1.4-inch driver in B&C’s range.
The 1 kHz crossover is the specification that demands attention. It’s 200 Hz lower than the DE550/DE550TN and DE910/DE910TN’s 1.2 kHz, 500 Hz lower than the DE254TN’s 1.5 kHz, and a full octave lower than the DE10’s 2.5 kHz. Crossing over at 1 kHz means the horn takes over directivity control at the very bottom of the mid-range — a frequency where most compression drivers haven’t begun operating and where horn pattern control produces the most dramatic improvement in system coverage and power response.
The B&C DE52 is built on the same platform as the DE550. The 51 mm voice coil, HT polymer diaphragm, and even the replacement diaphragm part number (MMD5508) are shared between the two drivers. What changes is the exit: 1.4 inches instead of 1 inch. The larger exit reduces compression at the throat, lowers distortion, and enables the 1 kHz crossover point that the 1-inch DE550 can’t support as effectively.
At 2.8 kg and 134 mm overall diameter, the B&C DE52 is larger and heavier than the compact 1-inch DE550 (1.17 kg, 92 mm). The 1.4-inch exit throat, larger compression chamber, and extended phase plug add physical size — the cost of the performance advantages the larger exit format provides. For professional touring and installed systems running 1.4-inch horns, the additional size and weight are standard for the format.
Design and Construction of the B&C DE52
The B&C DE52 uses a 51 mm (2-inch) aluminium voice coil driving an HT polymer diaphragm through a 1.4-inch (36 mm) exit throat. The 51 mm coil is the same unit found in the DE550 and DE550TN — the largest coil fitted to any B&C 1-inch or 1.4-inch exit compression driver. The shared coil means the B&C DE52 inherits the DE550’s thermal capacity, handling 70 W AES with the same sustained reliability.
The step from a 25 mm exit (1-inch) to a 36 mm exit (1.4-inch) fundamentally changes the acoustic behaviour of the compression chamber. The larger exit reduces the compression ratio — the diaphragm pushes air through a wider opening, which means less back-pressure, less nonlinear behaviour at high output levels, and cleaner performance at the bottom of the operating range.
This lower compression ratio is the engineering reason the B&C DE52 can cross over at 1 kHz. The 1-inch DE550 compresses its output through a smaller throat, which generates more SPL per unit of diaphragm displacement but introduces more distortion and compression at lower frequencies. The B&C DE52’s larger exit handles low-frequency content more gracefully, maintaining cleaner output down to 1 kHz where the 1-inch format is working significantly harder.
The magnetic circuit produces 1.8 T of flux density from a neodymium magnet assembly. While lower than the DE550’s 2 T, the 1.8 T is still extremely high for a compression driver and provides the concentrated magnetic field the 51 mm coil needs for 108 dB sensitivity. The B&C DE52 matches the DE550’s sensitivity exactly despite the lower flux — the larger exit’s more efficient acoustic coupling compensates for the reduced magnetic intensity.
The HT polymer diaphragm is the same high-temperature engineering polymer used in the DE550 and DE36 ring radiator. It delivers treble that sits between titanium and Mylar in character — more detailed and extended than polyester, smoother and more controlled than titanium. The polymer dome doesn’t produce the sharp resonant peak that titanium exhibits, making the B&C DE52 effective in systems running without DSP correction.
The 0.14 mH inductance matches the DE550, keeping the impedance curve manageable through the 1 kHz – 17 kHz operating range. The 17 kHz upper limit matches the DE550 and reflects the 51 mm coil’s slightly higher moving mass at the frequency extremes compared to smaller-coil drivers.
At 2.8 kg, 134 mm overall diameter, and 60 mm depth, the B&C DE52 is the most compact 1.4-inch exit driver we’ve covered with a 51 mm coil. The 60 mm depth is notably shallow for a 1.4-inch exit — 25 mm shallower than the DE254TN’s 85 mm. Four M6 mounting holes on a 76 mm (3-inch) bolt circle provide secure attachment to compatible 1.4-inch horn flanges. Note the 76 mm bolt circle — different from the DE254TN’s 102 mm, so horn compatibility should be verified at the bolt pattern, not just the exit size.
Performance and Applications for the B&C DE52
The B&C DE52 delivers 108 dB sensitivity across a 1 kHz – 17 kHz bandwidth with a recommended crossover frequency of 1 kHz. The 108 dB sensitivity is the highest of any 1.4-inch exit compression driver we’ve covered — 1.5 dB above the DE254TN’s 106.5 dB. The 51 mm coil and efficient HT polymer diaphragm produce more output per watt than the DE254TN’s 44 mm coil platform.
The 1 kHz recommended crossover is the headline specification — and it changes what a two-way system built with a 1.4-inch compression driver can achieve. Most professional two-way systems cross over between 1.2 and 2 kHz. The B&C DE52 pushes that boundary to 1 kHz, handing directivity control to the horn at a frequency where most compression drivers are still silent.
Crossing over at 1 kHz means the woofer operates only below 1 kHz — a narrow bandwidth where even a 15-inch woofer has wide, uniform directivity. The horn controls the entire mid-range and treble from 1 kHz upward, producing consistent coverage and smooth power response across the listening area. The directivity transition from woofer to horn happens at a frequency where the two match more naturally, reducing the coverage discontinuities that higher crossover points can produce.
For three-way systems, the B&C DE52’s 1 kHz crossover enables it to function as a combined mid-range and HF driver — handling everything from 1 kHz to 17 kHz from a single transducer on a horn. This eliminates the need for a separate midrange driver in many system architectures, simplifying the signal chain and reducing cabinet complexity.
The 70 W AES / 140 W program power handling matches the DE550, providing sustained high-power operation for touring and installed sound applications. The 51 mm coil’s thermal mass ensures the power rating holds up reliably during extended use, and the HT polymer diaphragm’s thermal stability prevents mechanical compromise at elevated operating temperatures.
The HT polymer diaphragm’s smooth treble character is particularly effective at the 1 kHz crossover point. In the 1–3 kHz range where the B&C DE52 takes over from the woofer, the response needs to be smooth and natural — any diaphragm resonance or peaking in this region would be immediately audible as coloration in the vocal and presence bands. The HT polymer delivers clean, controlled output through this critical range without the corrective EQ that a titanium diaphragm might require.
The replacement diaphragm (MMD5508) is shared with the DE550, which means builders stocking both the 1-inch DE550 and the 1.4-inch B&C DE52 need only one spare diaphragm part number in their inventory. For rental companies and system integrators, that parts commonality simplifies logistics.
Ideal applications for the B&C DE52 include:
- Professional two-way systems crossing over at 1 kHz for maximum directivity control
- Three-way systems where the B&C DE52 covers the combined mid-range and HF band
- Large-format touring speaker systems with 1.4-inch horns
- Installed sound systems in venues, theatres, arenas, and performance spaces
- Line array HF sections requiring 1.4-inch exit with maximum sensitivity and low crossover
- Systems where HT polymer’s smooth treble eliminates the need for DSP correction
- Applications requiring the same diaphragm as the DE550 for parts standardisation
- High-SPL systems where 70 W AES thermal headroom supports sustained operation
Specifications – B&C DE52
- Throat Diameter: 36 mm (1.4 in)
- Nominal Impedance: 8 Ω
- Minimum Impedance: 8.2 Ω
- Nominal Power Handling: 70 W
- Continuous Power Handling: 140 W
- Sensitivity: 108 dB
- Frequency Range: 1 kHz – 17 kHz
- Recommended Crossover: 1 kHz
- Voice Coil Diameter: 51 mm (2 in)
- Winding Material: Aluminium
- Inductance: 0.14 mH
- Flux Density: 1.8 T
- Magnet Material: Neodymium
- Diaphragm Material: HT Polymer
- Replacement Diaphragm: MMD5508
- Net Weight: 2.8 kg (6.17 lb)
Mounting Information – B&C DE52
- Overall Diameter: 134 mm (5.28 in)
- Depth: 60 mm (2.36 in)
- Bolt Pattern: Four M6 holes on 76 mm (3 in) bolt circle
Conclusion – B&C DE52 Compression Driver
The B&C DE52 is the lowest-crossover compression driver in B&C’s entire product range. The 1 kHz recommended crossover means the horn takes over directivity control at the very bottom of the mid-range — a full 200 Hz lower than the DE550 and DE910 platforms and 500 Hz lower than the DE254TN. For system designers, that 1 kHz handoff point produces the smoothest directivity transition, the most consistent coverage, and the best power response of any crossover point available from a B&C compression driver.
The 51 mm voice coil platform shared with the DE550 gives the B&C DE52 the highest sensitivity (108 dB) and the most power handling (70 W AES) of any 1.4-inch HT polymer driver in B&C’s range. The HT polymer diaphragm delivers smooth, natural treble through the 1–17 kHz bandwidth without requiring corrective EQ, and the shared MMD5508 replacement diaphragm simplifies parts inventory for builders using both 1-inch and 1.4-inch drivers from the same platform.
The 1.4-inch exit takes everything the DE550 does in its compact 1-inch format and elevates it with lower compression, cleaner low-frequency performance, and the 1 kHz crossover capability that the 1-inch format can’t fully support. The B&C DE52 is the 1.4-inch driver you choose when the system design demands the earliest possible handoff from woofer to horn — and the HT polymer diaphragm ensures that handoff sounds seamless, natural, and controlled.
For professional touring systems, installed sound, three-way designs, and any application where a 1.4-inch compression driver needs to cross over at 1 kHz with maximum sensitivity and smooth treble character, the B&C DE52 is the driver that goes lower than any other in the catalogue. One kilohertz crossover, 108 dB, 70 watts, HT polymer — the complete 1.4-inch package for system designers who won’t compromise on coverage.
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About B&C Speakers S.r.L.
B&C Speakers products are built in Bagno a Ripoli (Florence), Italy., ensuring high quality products to suite your speaker building requirements. Their 10,500 square meter facility incorporates highly sophisticated automation and quality control. Over the years they become one of the world leaders in the Professional Audio market, a brand recognized everywhere as a premium product that offers excellent value to the consumer.
