Two 2-way bookshelf monitors compared — a 1.5-inch silk dome tweeter against an AMT folded tweeter.
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Fig 2Bookshelf speakers · Dome vs AMTDrag to tune · Space toggles cutaway2,800 Hz · Crossover 50/50 · Phase-aligned
Drag across the speakers to tune the frequency, tap a preset or use the slider, and tap Cutaway to see inside the cabinets. On a keyboard, click the figure first, then use the arrow keys.
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Active audio current, voice coil in magnetic gap, and sound waves5.5″ mineral cone, half-roll rubber surround, and 2-way crossover PCBSpeaker 1: 1.5″ silk dome (1:1 piston) · Speaker 2: AMT folded pleats (5:1 velocity)Comparison of two reference 2-way bookshelf monitors. Both share a 5.5-inch curvilinear woofer, rear-flared bass reflex port, internal bracing, and 2,800 Hz Linkwitz-Riley crossover. Speaker 1 (left) employs a traditional 1.5-inch silk dome tweeter acting as a 1:1 direct radiator piston. Speaker 2 (right) features an Oskar Heil Air Motion Transformer (AMT): an accordion-pleated Kapton diaphragm with etched aluminum traces that squeezes adjacent folds, expelling air with a 5:1 velocity transformation ratio.