The Gramohorn II 3D Printed Acoustic Speaker ($1340-$6700) is made just for all you HTC One owners out there. The Gramohorn II is based on the simple mechanics of horn speakers, they act as resonance chambers which improve not only higher notes but produce deeper fuller bass. Your phones audio levels will increase by up to 50%. The Gramohorn is 3D printed and comes in either a plaster based composite or a limited edition stainless steel. Each piece is made to order so allow 2-4 weeks for delivery.