18 Sound XG10 – 1-Inch Transmission Line Array Waveguide with 10° Vertical Coverage
The 18 Sound XG10 is the 1-inch throat entry line array waveguide in 18Sound’s XG waveguide family — sharing the same transmission line acoustical design, the same 10° vertical coverage, and the same diecast aluminium construction as the larger XG14, but scaled for 1-inch exit compression drivers. With a 25.4 mm throat, 100° nominal horizontal × 10° vertical coverage, usable output from 1200 Hz upward, and a weight of just 0.4 kg, the 18 Sound XG10 is built for compact line array elements where the HF section uses 1-inch compression drivers and every gram of waveguide weight affects the total array mass.
The transmission line design is shared with the XG14. The internal geometry guides the sound wave from the compression driver’s throat to the waveguide mouth through a controlled acoustic path that minimises internal reflections and acoustic losses. Where conventional horn designs allow reflected energy to bounce back toward the throat and re-emerge delayed — causing comb-filtering and response irregularities — the 18 Sound XG10’s transmission line geometry keeps the energy moving forward, producing cleaner, more phase-coherent output at the waveguide mouth.
The throat shape has been specifically optimised for reducing air distortion. At the high sound pressure levels that compression drivers produce in line array operation, the air in the throat section compresses and rarefies asymmetrically, generating harmonic distortion products. The 18 Sound XG10’s throat geometry manages the pressure distribution to reduce this nonlinear behaviour — the same approach used on the XG14, scaled for the 1-inch format.
The 0.4 kg weight is less than half the XG14’s 1.0 kg. In a 16-element line array, the 18 Sound XG10 waveguides contribute just 6.4 kg of total array weight — 9.6 kg less than the same array using XG14 waveguides. For compact line arrays where element size and weight are the defining constraints, the 18 Sound XG10 provides transmission line waveguide performance at the smallest scale 18Sound offers.
The waveguide was developed to achieve optimum performance when coupled with 18Sound’s 1-inch exit compression drivers. 18Sound specifies the ND1085 as the reference driver, with sensitivity measured at 111 dB (1 W input on ND1085 rated impedance, 1 m on-axis, averaged 1–4 kHz).
Design and Construction of the 18 Sound XG10
The 18 Sound XG10 uses a transmission line acoustical design with a 25.4 mm (1-inch) throat entry. The transmission line architecture matches the XG14’s design philosophy — progressive internal expansions that guide the sound wave from throat to mouth with minimal reflections at each transition, delivering maximum phase coherence at the waveguide output.
The 1-inch throat is 10 mm smaller than the XG14’s 35 mm (1.4-inch) throat. The smaller throat size couples with 1-inch exit compression drivers — a format that is physically smaller, lighter, and typically less expensive than 1.4-inch drivers. For line array designs where the element size must be as compact as possible, the 1-inch format allows smaller waveguides, shallower elements, and lower per-element cost.
The trade-off of the smaller throat is less low-frequency coupling. The 18 Sound XG10’s usable frequency range starts at 1200 Hz — 200 Hz higher than the XG14’s 1.0 kHz recommendation. The smaller throat has less cross-sectional area at the entry, which means less acoustic energy can couple efficiently at lower frequencies. For most 1-inch compression driver applications, 1200 Hz is well within the driver’s operating range — but it means the woofer section needs to extend higher before handing off to the compression driver compared to a 1.4-inch system.
The 100° nominal horizontal coverage with 10° vertical matches the XG14’s coverage specification. The horizontal coverage varies from 80° to 120° depending on the specific cabinet design — the waveguide controls the vertical dispersion through its internal geometry, while the horizontal dispersion is partially formed by the cabinet walls that extend from the waveguide mouth to the baffle edges. The same cabinet-dependent flexibility that makes the XG14 versatile across different line array element widths applies equally to the 18 Sound XG10.
The 10° vertical coverage angle defines the inter-element splay that produces coherent vertical stacking. Each element covers a 10-degree vertical window — narrow enough for tight element spacing without excessive overlap, wide enough to contribute meaningful coverage to the combined array pattern. The 10° figure matches the XG14, which means line array designs can mix 1-inch and 1.4-inch waveguides at the same vertical coverage resolution.
The diecast aluminium construction provides the same advantages as the XG14: dimensional stability under acoustic pressure, thermal conductivity for heat dissipation from the compression driver throat, and manufacturing repeatability for consistent coverage between waveguides. Every 18 Sound XG10 is dimensionally identical from the diecasting process, which ensures phase-matched performance when multiple waveguides stack in an array.
The compact form factor is the 18 Sound XG10’s primary physical advantage. The 1-inch throat requires a smaller compression chamber and less internal volume than the XG14’s 1.4-inch throat, which translates to a shorter, shallower waveguide that takes up less space inside the line array element. For designs where the element height is the limiting dimension — the factor that determines how many elements fit in a given array length — the 18 Sound XG10’s compact size allows tighter element packing and finer vertical coverage resolution.
At 0.4 kg, the 18 Sound XG10 is one of the lightest professional line array waveguides available. The 60% weight reduction compared to the XG14 compounds across every element in the array. For flown arrays where total weight determines rigging requirements, motor sizing, and structural certification, 0.4 kg per waveguide is a meaningful contribution to keeping the system within safe and practical weight limits.
Performance and Applications for the 18 Sound XG10
The 18 Sound XG10 provides 100° horizontal × 10° vertical coverage with a 1000 Hz – 18 kHz frequency range and usable output from 1200 Hz upward. The 111 dB sensitivity (measured with the ND1085 compression driver at 1 W, 1 m, averaged 1–4 kHz) confirms the waveguide’s efficient coupling with 18Sound’s 1-inch exit drivers.
The 1200 Hz usable frequency threshold means the 18 Sound XG10 provides effective waveguide loading and pattern control from 1.2 kHz upward. Below this frequency, the waveguide’s mouth becomes too small relative to the wavelength to maintain controlled directivity, and the output broadens toward omnidirectional behaviour. For system designers, this means the crossover from woofer to compression driver should sit at or above 1.2 kHz for the horn to provide full directivity control at the crossover point.
The 18 kHz upper frequency limit confirms the 18 Sound XG10 maintains useful output through the full treble range. The transmission line geometry keeps the response extended and smooth at the highest frequencies, where conventional waveguide designs can produce irregular output from internal reflections and diffraction effects.
The phase coherence advantage of the transmission line design is the same as the XG14’s. In the 1–4 kHz range where vocal intelligibility and musical presence are defined, the 18 Sound XG10 delivers cleaner output with fewer comb-filtering artefacts than conventional horn designs. For line arrays, this phase coherence is critical — each element’s output must combine constructively with adjacent elements, and any phase irregularities within a single element degrade the combined array performance.
The 1-inch format positions the 18 Sound XG10 for compact line arrays, column speakers, and small-format vertically arrayed systems where 1.4-inch compression drivers would be too large or too expensive. 1-inch compression drivers are lighter, more compact, and typically more affordable per unit — making the 18 Sound XG10 the waveguide of choice for cost-effective and compact line array designs that still require professional transmission line waveguide performance.
The ND1085 driver pairing that 18Sound specifies for sensitivity measurement is a reference point — the 18 Sound XG10 works with any 18Sound 1-inch exit compression driver. Builders can select their 1-inch driver based on power handling, sensitivity, and diaphragm material requirements, then pair it with the 18 Sound XG10 for line array directivity control.
The horizontal coverage flexibility from 80° to 120° means the 18 Sound XG10 supports multiple line array element widths from a single waveguide model. Wider elements produce narrower horizontal coverage for longer throw. Narrower elements produce wider horizontal coverage for broader fill. The waveguide adapts to the cabinet without requiring different models for different coverage angles.
Conclusion – 18 Sound XG10 Line Array Waveguide
The 18 Sound XG10 is the compact counterpart to the XG14 — the same transmission line design, the same 10° vertical coverage, the same diecast aluminium construction, scaled for 1-inch exit compression drivers at 0.4 kg. It brings professional line array waveguide performance to the 1-inch format, providing the phase coherence and low-distortion throat geometry that the XG14 delivers in the 1.4-inch class.
The 1-inch format makes the 18 Sound XG10 the right choice for compact line arrays, column speakers, and small-format vertical arrays where element size, weight, and per-unit cost are the defining constraints. The 0.4 kg weight and compact dimensions allow tighter element packing and lighter arrays than the XG14 can achieve.
The trade-off is the 1200 Hz usable frequency threshold — 200 Hz higher than the XG14’s 1.0 kHz — which means the woofer section carries more of the upper mid-range before handing off to the compression driver. For systems that can accommodate a 1.2 kHz or higher crossover, the 18 Sound XG10 delivers the full transmission line advantage at 60% less weight per waveguide.
For compact line arrays, lightweight touring systems, column speakers, and any multi-element vertical array where a 1-inch transmission line waveguide needs to deliver 10° vertical coverage with maximum phase coherence from the lightest possible package, the 18 Sound XG10 is the 1-inch waveguide that carries the XG platform’s transmission line engineering at a fraction of the weight.
VIEW MORE 18 Sound PRODUCTS HERE.
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.
