TD-4001 compression driver ![]() DP-4001 Be diaphragm TAD TD-4001 compression driver employs a special DP-4001 pure beryllium diaphragm of 4 inches (101mm) across. Beryllium is a light but very rigid material that features very high-speed sound propagation. The weight of the dome section has been reduced to a mere 1g contributing to the very high efficiency (110dB/W) of this driver. ![]() voice-coil TAD TD-4001 employs an aluminum ribbon voice coil, insulated by alumite film and wound edgewise on the bobbin. The voice coil has a small mass yet offers a high conversion efficiency. The bobbin is formed of polyimide film, displaying excellent heat resistance to temperatures as high as 752ºF (400ºC). ![]() Alnico magnet Total magnetic flux is 228,000Mx, with flux density of 20,000G, thanks to the use of a very heavy (6.6 lbs / 3 kg) alnico 5DG magnet. An oxygen-free copper shorting ring prevents impedance rise, resulting in low distortion. ![]() rear compression TAD TD-4001 is of the rear compression design, which eliminates the resonance and phase distortion produced by a surround. It also eliminates cavity resonance interference, achieving very flat frequency response, extremely natural sound and superb definition. A phasing plug helps smooth the response of extra high frequencies. ![]() xover TAD recommends a Crossover-Frequency (Fc) of 600Hz or higher with a Cutoff-Slope of 12dB/octave or higher. ![]()
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AllegroSound World's Finest Audio Systems "love what you listen with" Los Angeles, California USA Rick@AllegroSound.com alt: AllegroSound@yahoo.com Est.1973 - tel.323.960.5014 © 2002~2010 AllegroSound |