Hartke revolutionized the world of bass amplification in 1985 with the creation of the first aluminum cone, capable of offering an excellent attack and a wide sound range even in the mid-high frequency range.

First admirer of the prototype developed by Larry Hartke and Ron Lorman, and catalyst of the rapid success of the Brand, was Jaco Pastorius.

In the following years, observing the habit of some artists, including Jack Bruce of Cream, to use together amplifiers with aluminum cones and amplifiers with traditional cardboard cones, Hartke’s engineers took inspiration for a new revolution