The Speaker System
The 10" bass drivers have a lower resonance, longer voice coil, and longer excursion (travel) than any other speakers of their type. The result is better cone control and lower distortion at low frequencies. The voice coil is wound on a high-temp Kapton former. The rigid cone ensures piston operation at low frequencies, allowing computer aided Thiele-Small analysis to provide unprecedented levels of low-distortion, low frequency output from speaker cabinets this small.

The use of our special bass speaker is made possible by the addition of a high-output 5" midrange driver. For adequate midrange, and at the expense of low bass, other systems rely on exotic metal or non-rigid "curvilinear" woofer cones. The result is higher distortion levels in both the bass and mid bands. The cone midranges in the Low B speakers provide superior smoothness and lower distortion without sacrificing "punch" or clarity. The midrange system can handle over 100 watts, and the attenuator allows total flexibility and control.

The extended high-frequency response of the midrange driver allows the addition of an audiophile quality tweeter at relatively low cost. In contrast, conventional 2-way bass speakers have to use expensive deep horn compression drivers with much greater power handling to compensate for their lack of a dedicated midrange speaker. The Acme system uses a ferrofluid-cooled shallow horn dome tweeter, which exhibits much lower distortion and far better dispersion characteristics.

The Cabinet Construction
Borrowing from aircraft technology, every high-grade birch plywood panel in the Low B-1, Low B-2 and Low B-4 boxes is individually stressed to hundreds of pounds of tension. This meticulous and costly procedure increases the strength-to-weight ratio, and provides the non-resonance of conventional enclosures weighing much more.

Quality in the Details
Military grade circuit board, solid copper buss wiring, high voltage crossover components, premium quality banana plug, ¼" and Speakon input jacks, and all soldered connections ensure first-rate electrical integrity and years of trouble free service. New crossover circuitry protects the tweeter, midrange driver and both attenuators from any damage even in the most extreme of circumstances.

Minimum signature contoured port openings and airtight input jacks eliminate audible "fluttering" or "chuffing" noise at low frequencies. Heavy gauge foam damped metal grille mounted with rubberized washers to eliminate all screen noise. Durable black carpet covering and black-powder coated metal edges enable the Low B-1, Low B-2 and Low B-4 to look good onstage and stay attractive for years. Standard stacking corners provide flexibility for use in multiple systems.

Every single Acme speaker is tested by Acme’s founder and chief designer, Andy Lewis, before shipping.