Pioneer TD-4001 TAD Driver

Pioneer Updated: 2009-04-10 RSS
Pioneer TD-4001 TAD Driver

The TD-4001 employs a pure beryllium diaphragm 3-15/16 inches (100mm) 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.

The 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 752 (400C).

Total magnetic flux is 228,000Mx, with flux density of 20,000G, thanks to the use of a very heavy (6 lbs. 10 oz./3kg) alnico 5DG magnet. An oxygen-free copper shorting ring prevents impedance rise, resulting in low distortion.

The 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.

We recommend the use of a crossover frequency of 600Hz or higher, and a cutoff slope of 12dB/oct. or sharper.


Voice coil impedance: 16 ohms.
Voice coil diameter: 4 inches/l0lmm.
Equalizing system: 5-slit type.
Frequency range: 600 - 20,000Hz.
Maximum input power: 60 watts (600Hz -12dB/oct.).
Sound pressure level: 110dB/W (1m).
Crossover frequency: over 600 Hz (-12dB/oct.).
Total magnetic flux: 228,000 maxwells.
Magnetic flux density: 20,000 gauss.
Hole size for throat connection: 1-15/16 inches/49.4mm.
Mounting dimensions: 4 inches/l0l.6mm (4 holes).
Weight: 29 lbs. 12 oz./13.5kg.
Outer dimensions (diameter x depth): 7 x 6-1/8 inches/178 x 155.5mm.

Copyright 2011 GeneralManual.Com. All Rights Reserved. Products and names mentioned are the property of their respective owners. Privacy Policy RSS
This page is part of GeneralManual.Com Network Pioneer TD-4001 TAD Driver User Manual.