CELESTION H1-7050 ‘No Bell’

Celestion H1-7050 ‘No Bell’: 1" horn with elastomer side panels, 90 mm deep

The Celestion H1-7050 ‘No Bell’ is an HF horn with a 1" throat for compression drivers with a bolt-on flange. The name says it all: ‘No Bell’ stands for a body that does not ring like a bell. Celestion achieves this with embedded elastomer side panels that make the horn acoustically inert – body resonances that would otherwise become audible as a separate rattle at high sound pressure are damped in the material instead of being radiated.

At 0.7 kg and 90 mm mounting depth, the H1-7050 is a compact horn that fits shallow enclosures. The concept – a rigid horn body with damped wall sections – sets it apart from plain plastic or cast horns: it combines the dimensional accuracy of a solid body with material damping that you would otherwise have to add afterwards with bitumen or damping sheets. 42.audio lists the horn with a link to the manufacturer's page.

Use and enclosure

The H1-7050 is designed for compression drivers with a 1" exit and bolt-on (flange) mounting – screw-on drivers do not fit without an adapter. In the Celestion range at 42.audio, the 1" drivers of the CDX1 series are the match; pick the bolt-on flange variant, because Celestion offers many models in both mounting styles. Typical use is the HF section of a two-way top or monitor with a mid-woofer where depth and weight are limited.

A compact 1" horn only controls the radiation from mid to high frequencies upwards; cross over with a margin above the driver's resonance and with a steep slope so the driver does not run into excursion below the horn loading. The 90 mm mounting depth plus the length of the driver define the required cabinet depth. The elastomer damping saves you from damping the body yourself – the bolting to the baffle should still be firm and stress-free.

What to look out for

• 1" throat for bolt-on flange drivers – screw-on drivers do not fit without an adapter.
• Mounting depth 90 mm: plan cabinet depth together with the driver length.
• Weight 0.7 kg – light enough for compact tops and monitors.
• Elastomer side panels damp body resonances; no additional damping of the horn needed.
• Compact horn: set the high-pass steep and with margin above driver resonance.

Frequently asked questions

Celestion H1-7050 ‘No Bell’: manufacturer, spellings and classification

Celestion is the British loudspeaker manufacturer Celestion International Ltd. of Ipswich, England; its PA drivers are also known as Celestion Pro Audio. The H1-7050 ‘No Bell’ is a 1-inch horn / waveguide, available from 42.audio, Celestion dealer in Germany, with datasheet and full specifications in the driver database.

At 42.audio you get the CELESTION H1-7050 ‘No Bell’ with all key data in the driver database. More drivers from this manufacturer: Atlas Celestion.