18 Sound XR1464C – Constant-Directivity 1.4-Inch Horn Flare with Focused 60° × 40° Coverage for Long-Throw Applications
The 18 Sound XR1464C is the long-throw constant-directivity horn in 18 Sound’s XR series — sharing the same 1.4-inch throat entry, the same 0.8 kHz cutoff frequency, the same composite construction, and the same 270 × 270 mm body as the wider-coverage XR1496C, but with a tighter 60° × 40° coverage pattern that focuses acoustic energy over greater distances. Where the XR1496C’s 90° × 60° pattern covers a wide listening area at moderate throw, the 18Sound XR1464C concentrates the compression driver’s output into a narrower beam that maintains SPL and tonal balance at the distances where wider horns have already lost their reach.
The 60° × 40° coverage pattern is the standard geometry for long-throw PA applications. The narrower horizontal coverage concentrates energy toward the back of the venue rather than spreading it across the side walls. The tighter vertical coverage keeps energy focused on the audience plane with even more precision than the XR1496C’s 60° vertical, reducing ceiling reflections and floor bounce in acoustically challenging spaces.
The constant-directivity design maintains the 60° × 40° pattern from 1.2 kHz through 16 kHz — the same nearly four octaves of consistent pattern control that the XR1496C delivers, but within a tighter coverage window. Listeners at the edge of the 60° × 40° pattern hear similar tonal balance to those on-axis, which means the 18Sound XR1464C doesn’t sacrifice off-axis quality for the tighter pattern — it simply directs the controlled coverage into a narrower area.
18Sound designed all XR series horns to eliminate the midrange narrowing and high-frequency beaming problems common in many similar horns on the market. The 18Sound XR1464C addresses both — the constant-directivity flare profile prevents the coverage from collapsing in the mid-range and prevents the high frequencies from concentrating into an excessively narrow on-axis beam.
At 1.4 kg with a 0.8 kHz cutoff and constant directivity from 1.2 kHz, the 18Sound XR1464C pairs with 18Sound’s 1.4-inch exit compression drivers for professional two-way and three-way systems where focused, controlled, long-throw coverage is the design requirement.
Design and Construction of the 18 Sound XR1464C
The 18 Sound XR1464C uses a constant-directivity flare profile with a 35 mm (1.4-inch) throat entry expanding to the 270 × 270 mm mouth. The flare profile is engineered to maintain the 60° × 40° coverage angles as consistently as possible from 1.2 kHz through 16 kHz — counteracting the natural tendency of finite-sized horns to narrow their coverage as frequency increases.
The constant-directivity approach requires a different flare geometry from the XR1496C’s wider-coverage design. A narrower coverage pattern means the horn needs to shape the wavefront more aggressively — concentrating energy into a tighter window while still preventing the pattern from collapsing further at high frequencies. The 18Sound XR1464C’s flare achieves this balance, maintaining 60° × 40° coverage without the abrupt pattern changes that can occur in horns designed without constant-directivity engineering.
The 0.8 kHz cutoff frequency matches the XR1496C — the same mouth area (270 × 270 mm) and throat entry (35 mm) produce the same low-frequency loading capability regardless of the coverage pattern. The cutoff frequency is determined by the horn’s mouth dimensions relative to the wavelength, not by the flare profile’s directivity characteristics. This means the 18Sound XR1464C provides useful acoustic loading from 800 Hz upward — well below the typical 1–1.5 kHz crossover frequencies of 18Sound’s 1.4-inch compression drivers.
The composite material construction matches the XR1496C — the same high-damping structure that eliminates horn resonances, resists flexing under acoustic pressure, and provides optimised weight. The composite doesn’t ring, doesn’t add coloration, and provides the acoustically dead interior surface that clean wavefront propagation requires.
The high-damping properties are particularly important in a long-throw horn. At the distances where the 18Sound XR1464C operates — venues where the last row is 20, 30, or 40 metres from the speaker — any horn-induced coloration compounds with distance. Room reflections, atmospheric absorption, and the inverse square law all work against the direct sound. A horn that adds its own resonant character to the output makes the problem worse. The 18 Sound XR1464C’s composite construction ensures the only thing reaching the back row is the compression driver’s output shaped by the constant-directivity geometry — no horn-added artefacts.
The 270 × 270 × 180 mm dimensions and 240 × 240 mm baffle cutout match the XR1496C exactly. The two horns share the same physical envelope, which means a cabinet designed for the XR1496C can accept the 18Sound XR1464C without modification — and vice versa. System designers can specify one cabinet design and offer it with either coverage pattern by simply swapping the horn.
At 1.4 kg, the 18Sound XR1464C adds the same negligible weight as the XR1496C. The composite material keeps the mass optimised despite the 270 × 270 mm mouth area and 180 mm depth.
Performance and Applications for the 18 Sound XR1464C
The 18 Sound XR1464C provides 60° × 40° constant-directivity coverage from 1.2 kHz through 16 kHz when loaded with a suitable 18Sound 1.4-inch exit compression driver. The tighter coverage pattern compared to the XR1496C’s 90° × 60° means the acoustic energy is concentrated into a smaller coverage window — and concentration is the mechanism that produces longer throw.
When the same amount of acoustic energy from a compression driver is focused into 60° × 40° instead of 90° × 60°, the on-axis SPL at any given distance is higher. The energy that the XR1496C spreads across a 90° horizontal window is instead concentrated into 60° — a 33% reduction in coverage angle that produces measurably more output at the coverage centre. For venues where the back row is far from the speaker, this concentration is the difference between the high frequencies reaching the audience and fading into the ambient noise floor before they arrive.
The 60° horizontal coverage is the standard angle for medium to long-throw PA applications in professional touring and installed sound. It’s narrow enough to maintain useful SPL at distance while still covering a practical seating area. For venues wider than the 60° coverage window, multiple cabinets can be horizontally arrayed with overlapping patterns — a common practice in large venue PA design where the system uses long-throw cabinets for the main audience and wider-coverage down-fill or side-fill cabinets for the near field.
The 40° vertical coverage is the tightest vertical pattern in 18Sound’s XR horn range. It focuses energy precisely on the audience plane with minimal waste on the ceiling and floor. In a flown PA system angled downward toward the audience, the 40° vertical window can be aimed to cover from the front row to a specific distance — the tight vertical control prevents energy from spilling past the intended coverage boundary.
The constant-directivity behaviour ensures that listeners at the edge of the 60° × 40° pattern hear tonal balance close to what the on-axis listener hears. Without constant directivity, a 60° × 40° horn would deliver bright, full-range sound on-axis and progressively duller sound toward the edges — the classic complaint about horns that narrow their coverage at high frequencies. The 18Sound XR1464C maintains more consistent frequency response across the entire coverage window, producing a larger area where the sound quality is uniform.
The physical interchangeability with the XR1496C is a practical advantage for system designers, rental companies, and product manufacturers. One cabinet design, two horn options — 90° × 60° for wide coverage in small to mid-sized venues, 60° × 40° for focused coverage in medium to large venues. The same compression driver, the same crossover, the same amplifier settings — only the horn changes, and the coverage pattern changes with it.
The 0.8 kHz cutoff ensures the horn provides full loading and pattern control at the crossover frequencies of 18Sound’s 1.4-inch compression drivers. With constant directivity maintained from 1.2 kHz, the woofer-to-horn transition happens within the horn’s controlled bandwidth, producing a smooth directivity handoff without the coverage gap that occurs when the horn’s control range doesn’t extend to the crossover point.
The 18Sound XR1464C is the right choice whenever the venue requires more focused coverage than the XR1496C provides. Longer throw distances, narrower seating areas, venues where side wall reflections from a wider horn would degrade the sound — all favour the 60° × 40° pattern. The XR1496C’s 90° × 60° fills the room. The 18Sound XR1464C reaches the back row.
Conclusion – 18 Sound XR1464C Horn Flare
The 18 Sound XR1464C is the focused-coverage counterpart to the XR1496C — the same body, the same weight, the same cutoff frequency, the same composite construction, the same constant-directivity engineering from 1.2 kHz to 16 kHz. The difference is the coverage pattern: 60° × 40° instead of 90° × 60°. Narrower horizontal, tighter vertical, more concentrated energy, longer throw.
The constant-directivity design ensures the tighter pattern doesn’t mean sacrificed off-axis quality. Listeners at the edge of the 60° × 40° window hear tonal balance close to on-axis — the 18 Sound XR1464C controls coverage without creating the harsh brightness on-axis / dull edges that non-constant-directivity horns produce.
The physical interchangeability with the XR1496C gives system designers maximum flexibility from minimum inventory. One cabinet, two horns, two coverage options. The 18Sound XR1464C for long throw and focused coverage. The XR1496C for wide coverage and broad fill. Same compression driver, same crossover, same everything else.
For long-throw PA systems, touring rigs, theatre installations, houses of worship, and any application where a 1.4-inch constant-directivity horn needs to deliver focused 60° × 40° coverage with the lowest cutoff frequency and widest pattern control bandwidth available, the 18Sound XR1464C concentrates the energy where the audience sits and keeps it there — consistently, predictably, and four octaves wide.
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About 18 Sound
18 Sound products are proudly made in Reggio Emilia, Italy, combining advanced technology with Italian craftsmanship. Known for their high-performance professional audio components, 18 Sound is a trusted name in the global audio industry. Their state-of-the-art manufacturing and strict quality control ensure exceptional reliability and sound clarity. 18 Sound products are designed to meet the demands of speaker builders and audio professionals, 18 Sound offers premium products with outstanding value and performance worldwide.
