18 Sound AMT200P – 18 Sound’s First Air Motion Transformer with Planar Exit and Ultra-Fast Transient Response
The 18 Sound AMT200P is 18 Sound’s first Air Motion Transformer, delivering the market a new benchmark in terms of quality and reliability. A unique magnetic structure and the strongest neo magnet, together with the highest quality membrane components, are setting the new level for high-quality planar high-frequency reproduction with the lowest possible distortion level in the pro audio field and an unmatched transient response.
This is the exact transducer 18 Sound’s XMT200 constant-directivity horn was purpose-built around — that horn’s 167 mm rectangular throat, 90° × 20° coverage, and 600 Hz cutoff were all engineered specifically to match this AMT’s radiating geometry and acoustic loading requirements. Where conventional compression drivers use a dome diaphragm pushing air through a phase plug and throat, the AMT200P’s P.I. membrane uses a folded, pleated diaphragm that squeezes air out of its pleats at a velocity several times faster than the diaphragm itself physically moves — the mechanical principle that produces this driver’s genuinely exceptional transient speed and low distortion.
Features documented directly by 18 Sound include planar exit geometry, super fast transient response, extremely low harmonic distortion, a dedicated waveguide available (the XMT200), and super accurate control directivity in vertical stacks — a specific advantage for line array applications where consistent vertical coupling between elements matters as much as horizontal coverage.
Design and Construction of the 18 Sound AMT200P
The 18 Sound AMT200P is built around a unique magnetic structure using the strongest neodymium magnet in its class, driving a P.I. (pleated) polyester membrane. Unlike a conventional compression driver’s dome diaphragm, which must physically travel the full distance the air needs to move, the AMT’s folded membrane amplifies air velocity mechanically as the pleats compress and expand — this is the fundamental reason AMT technology can achieve transient response and low distortion figures that dome-diaphragm compression drivers, regardless of material, cannot match.
The 0.82 T flux density confirms the substantial magnetic circuit strength required to drive the AMT’s planar membrane geometry effectively across its full 800 Hz – 18 kHz operating bandwidth.
The planar exit geometry is specifically what the dedicated XMT200 waveguide couples to — the horn’s large 167 mm throat entry was engineered to match this AMT’s rectangular radiating aperture precisely, providing the acoustic loading and directivity control that a folded-diaphragm transducer of this radiating area requires.
At 3.4 kg with an 81 mm depth, a rectangular throat measuring 167 × 31 mm, and a 174 × 86 mm bolt circle secured with 4×4×M6 mounting holes, the 18 Sound AMT200P’s mounting geometry is entirely distinct from every conventional round-throat compression driver documented elsewhere in this session — a genuinely different mechanical interface reflecting the fundamentally different transducer technology.
Performance and Applications for the 18 Sound AMT200P
The 18 Sound AMT200P delivers 105 dB sensitivity across an 800 Hz – 18 kHz frequency range, with a recommended crossover of 1.2 kHz using a 12 dB/octave or steeper high-pass filter. The 60 W AES / 120 W continuous program power handling is modest by conventional compression driver standards, but appropriate for a transducer whose primary advantage is transient accuracy and distortion performance rather than maximum raw output.
Super accurate control directivity in vertical stacks is a specific, genuinely valuable feature for line array applications — the AMT200P’s planar radiating geometry couples between adjacent elements in a vertical array with more predictable, controlled behaviour than round-exit compression drivers typically achieve, directly supporting the coherent wavefront that professional line array design depends on.
Paired with the dedicated XMT200 waveguide, the 18 Sound AMT200P delivers 90° × 20° constant-directivity coverage from 600 Hz to 18 kHz — nearly five octaves of consistent pattern control, the widest constant-directivity bandwidth documented on any horn in 18 Sound’s range across this entire session. The combination represents 18 Sound’s premium alternative to conventional compression-driver-on-horn HF sections, trading maximum power handling for transient speed, distortion performance, and directivity precision.
For high-fidelity PA systems, premium line arrays, and applications where HF transient accuracy and low distortion define the system’s sonic character more than absolute maximum output, the 18 Sound AMT200P represents 18 Sound’s first step into planar transducer technology.
Conclusion – 18 Sound AMT200P Air Motion Transformer
The 18 Sound AMT200P is 18 Sound’s first Air Motion Transformer — a genuinely different transducer technology from every compression driver documented across this session, using a folded, pleated polyester membrane to achieve transient response and distortion performance that dome-diaphragm drivers cannot match. Paired with the purpose-built XMT200 waveguide, the combination delivers exceptional directivity control and the widest constant-directivity bandwidth in 18 Sound’s horn range.
For premium two-way and multi-way systems, line arrays demanding superior vertical stacking directivity, and any application where HF fidelity and transient accuracy are the priority, the 18 Sound AMT200P represents a genuinely distinct technology choice 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.
