Fra Audioholics.com
The A7 Tower features a transmission line enclosure for the mid/high driver array. The top portion of the speaker utilizes a D'Appolito driver topology with dual 5 ¼" magnesium cone midrange drivers and a 1" silk dome tweeter. The bass portion utilizes dual 10" magnesium cone drivers. All of the drivers are from SEAS.
The cabinet is a slim, tall, deeply rounded tower that breaks away from the traditional box cabinet design. The top and bottom are both ellipsoids of equal area with different diametric shapes resulting in a smooth tapering column with no parallel surfaces and a constant cross sectional area.
The crossover network uses 24dB/octave-acoustical slopes which is a combination of 2 nd order electrical slopes with the natural roll of the drivers. The crossovers use the highest quality components including air core inductors and polypropylene capacitors. The networks are all individually laid out and isolated from each other.
This system was designed by Dr. Joe D'Appolito, the inventor of the D'Appolito driver array which sandwiches a tweeter between two midrange (MTM) which helps control vertical dispersion phase displacement and the related interference effects, the portions of the sound emitted upwards and downwards are minimized
Virtually any wood finish is available upon special order.
System Specifications:
Frequency Response: 27Hz - 40kHz
Crossover Frequencies: 250Hz, 1.8kHz, 3kHz
Sensitivity: 89dB @ 1 watt/meter
Impedance: 8 ohms
Weight: 170lbs
Dimensions: 59" x 15" x 21"