18 Sound AMT100H – Compact Air Motion Transformer with EWAL Voice Coil Technology
The 18 Sound AMT100H is a compact Air Motion Transformer in 18 Sound’s planar HF driver range, sharing the fundamental AMT operating principle documented on the flagship AMT200P — a folded, pleated diaphragm that amplifies air velocity mechanically as it compresses and expands, producing the transient speed and low distortion characteristic of this transducer category — but delivered from a dramatically smaller and lighter chassis.
18 Sound’s own product page for the 18 Sound AMT100H carries no descriptive marketing text, only the specification sheet and a single documented technology: EWAL (Edge Wound Aluminium Voice Coil). This is a notable technology pairing — EWAL construction, more commonly associated with conventional compression driver coils elsewhere in 18 Sound’s range, applied here to the AMT’s planar drive structure rather than a dome diaphragm.
At 0.85 kg, the 18 Sound AMT100H weighs a quarter of the AMT200P’s 3.4 kg, with a correspondingly smaller 80 × 100 mm rectangular throat versus the flagship’s 167 × 31 mm aperture — confirming this is a genuinely more compact platform intended for smaller-format two-way systems rather than the large-format line array and premium PA applications the AMT200P targets.
Design and Construction of the 18 Sound AMT100H
The EWAL (Edge Wound Aluminium Voice Coil) technology is the sole construction detail 18 Sound documents for this driver. Edge-wound aluminium winding packs more conductor into the drive structure per unit of height than standard round-wire winding, maximising force output from a compact voice coil footprint — the same fundamental packing advantage EWAL provides on 18 Sound’s conventional compression drivers, here applied within the AMT’s planar drive geometry.
At 0.85 kg, 65 mm depth, an 80 × 100 mm rectangular throat, and a 70 × 90 mm bolt circle secured with 4× M6 mounting holes, the 18 Sound AMT100H’s mounting geometry is proportionally scaled down from the AMT200P’s larger format, while retaining the same rectangular throat and M6 bolt pattern approach.
Performance and Applications for the 18 Sound AMT100H
The 18 Sound AMT100H delivers 93 dB sensitivity across an 800 Hz – 20 kHz frequency range, with a recommended crossover of 1.2 kHz using a 12 dB/octave or steeper high-pass filter. The upper frequency extension to 20 kHz is genuinely wider than the AMT200P’s 18 kHz limit, despite this being the smaller, more compact platform of the two.
The 25 W AES / 50 W continuous program power handling is modest, appropriate for compact two-way systems and smaller-format applications rather than high-SPL touring or line array duty — the AMT200P remains the higher-power, larger-format choice within 18 Sound’s AMT range.
At 93 dB, sensitivity is considerably lower than the AMT200P’s 105 dB — a direct consequence of the smaller radiating area inherent to this more compact planar drive structure. For applications where minimal size, light weight, and the AMT’s characteristic transient speed matter more than maximum output or sensitivity, the 18 Sound AMT100H brings planar HF technology to a genuinely small-format package.
Conclusion – 18 Sound AMT100H Air Motion Transformer
The 18 Sound AMT100H is a compact, lightweight Air Motion Transformer — a quarter of the AMT200P’s weight, with a proportionally smaller throat and mounting footprint, built around EWAL voice coil technology. With limited published documentation beyond its core specification sheet, this driver appears positioned as the entry point into 18 Sound’s planar HF technology for smaller-format applications where the AMT200P’s larger scale and higher cost aren’t required.
For compact two-way systems seeking AMT-class transient performance without the size, weight, or power handling of the flagship platform, the 18 Sound AMT100H offers a genuinely distinct alternative within 18 Sound’s HF driver catalogue.
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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.
