THE PROFESSIONAL series
HIGH frequency DRIVERS

USED IN PROFESSIONAL STUDIOS AROUND THE WORLD.

HIGH FREQUENCY DRIVERS


TD-4001

Overview

The TD-4001 successfully achieves all the design objectives we set forth: very high efficiency, wide and perfectly flat response from 600Hz to 20kHz, and low distortion.

Diaphragm

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 (1W,1m), of this driver.

Voice Coil

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 752ºF (400ºC).

Magnetic Circuit

Total magnetic flux is 2.28x10-3Wb, with flux density of 2.00T, 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.

Design

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.

Crossover

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

TD-4001 Specification

Rated Impedance: 16 Ω
Frequency Range: 600-20,000 Hz
Rated Input Power: 30 W
Maximum Input Power: 60 W
Sound Pressure Level: 110 dB (1W1m)
Total Magnetic Flux: 2.28 x10-3 Wb
Magnetic Flux Density: 2.00 T
Lowest Recommended Crossover: 600 Hz
Voice Coil Diameter: 101 mm
Phasing Plug: 5-slit rear type
Hole Size for Throat Connection: 49.2 mm
Mounting Dimensions: 101.6 mm (4 holes)
Weight: 12.6 kg
Dimensions (diameter x depth): 178 x 155.5 mm


TD-4003

Overview

The TD-4003 is developed by building on the many key design successes found in the previous released Drivers. The results of this engineering feat is a product of improved clarity with a linear response over a wide frequency range of 600Hz to 20,000Hz at an SPL of 112dB (1W,1m). Contributing to these improvements is the newly designed Aluminum 5 slit phasing plug. Although the basic design of the phase plug is unchanged, we have made subtle improvements to the shape and material. In addition, the use of Neodymium has been utilized in order to achieve increased magnetic flux density of 2.00T gauss while lowering the weight to less than 22 pounds. 

A new technique in reducing unwanted resonance caused by AC current interference is our Direct Power Coupling Technology. This allows direct connection from the speaker wire to the Beryllium Diaphragm. The result is a high frequency driver with the dearest sound possible combined with excellent performance and durability.

TD-4003 Specification

Rated Impedance: 16 Ω
Frequency Range: 600-20,000 Hz
Rated Input Power: 30 W
Maximum Input Power: 60 W
Sound Pressure Level: 112 dB (1W,1m)
Total Magnetic Flux: 2.28 x10-3 Wb
Magnetic Flux Density: 2.00 T
Lowest Recommended Crossover: 600 Hz
Voice Coil Diameter: 101 mm
Phasing Plug: 5-slit rear type
Hole Size for Throat Connection: 39 mm
Mounting Dimensions: 87.4 mm (4 holes)
Weight: 9.9 kg
Dimensions (diameter x depth): 171 x 156 mm


TD-2001

Overview

The TD-2001 is designed to an exceptionally wide frequency range of 500 to 22,000Hz, high efficiency and high dependability.

Voice Coil

For the voice coil, the TD-2001 employs edgewise-wound aluminum ribbon wire, insulated in alumite film. This design provides an exceptionally high acoustic conversion efficiency. It is wound on a bobbin formed from a high-polymer compound having ideal heat resistance up to 752ºF (400ºC).

Magnetic Circuit

The magnetic circuit includes a 2.2 lb. (1kg) alnico magnet for a total magnetic flux of 6.85x10-4Wb. The center pole is capped by a ring of pure silver to prevent an increase in impedance (and resultant distortion) at high frequencies.

Diaphragm

A pure beryllium diaphragm is employed in the TD-2001. This diaphragm ensures rapid sound wave transmission, extremely flat frequency response, little cone breakup, excellent transient response and high sound image definition. Deformation is prevented by a surround formed of a special high-polymer compound. It also effectively prevents fatigue and rupture caused by an excessive input level.

Design

A rear-compression mounting system is employed for the diaphragm and voice coil assembly. This assures enhanced clarity, for rear compression neatly avoids the resonance generated at the edge of the diaphragm. It also improves the phase uniformity of all frequencies, particularly highs, since they are emitted from virtually all points on the diaphragm. A phasing plug serves to eliminate phase disturbances at the throat region, for virtually flat frequency response.

TD-2001 Specification

Rated Impedance: 8 Ω
Frequency Range: 500-22,000 Hz
Rated Input Power: 10 W
Maximum Input Power: 30 W
Sound Pressure Level: 109 dB (1W,1m)
Total Magnetic Flux:  6.85 x10-4 Wb
Magnetic Flux Density: 1.80 T
Lowest Recommended Crossover: 800 Hz
Voice Coil Diameter: 48 mm
Phasing Plug: 3-slit rear type
Hole Size for Throat Connection: 25.4 mm
Mounting Dimensions: 76.2 mm (2 holes) 57.2 mm (3 holes)
Weight: 6.4 kg
Dimensions (diameter x depth): 141 x 110 mm


TD-2002

Overview

This 1" Throat driver is also based upon the very successful Model TD-2001, which has been the mainstay in the professional sound industry for this size driver. 

Among the significant improvements designed by the TAD Engineers is the redesigned Aluminum 3 slit phasing plug. As with the TD-4003, we have made subtle improvements to the shape and material which has contributed to the improved frequency response. Our use of Alnico5 has achieved an increased magnetic flux density of up to 1.95T.  As with the TD-4003, we have applied the Direct Power Coupling technology which allows direct connection from the speaker wire to the Beryllium Diaphragm thereby reducing unwanted resonance caused by AC current interference. 

Overall, TD-2002 delivers excellent performance and durability with improved clarity and linear response over a wider frequency range at an SPL of 111dB (1W,1m).

TD-2002 Specification

Rated Impedance: 8Ω
Frequency Range: 800-20,000 Hz
Rated Input Power: 10 W
Maximum Input Power: 40 W
Sound Pressure Level: 111 dB (1W,1m)
Total Magnetic Flux: 7.42 x10-4 Wb
Magnetic Flux Density: 1.95 T
Lowest Recommended Crossover: 800 Hz
Voice Coil Diameter: 48 mm
Phasing Plug: 3-slit rear type
Hole Size for Throat Connection: 25.4 mm
Mounting Dimensions: 57.2 mm (3 holes), 76.2 mm (4 holes)
Weight: 6.9 kg
Dimensions (diameter x depth): 141 x 137 mm

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