The A1M features a solid Sitka spruce top with scalloped bracing, rosewood back and sides and the Yamaha original SRT piezo pickup for solid, plugged-in performance.
 
A Series guitars are louder and stronger in the low-mid ranges thanks to cutting-edge acoustic analysis technology developed by the Yamaha R&D Division, which led to the addition of scalloped bracing for the top and shorter bracing than normal for the back.