ARCHIVED PROFESSIONAL UNIT SPEAKERS

HIGH FREQUENCY DRIVERS

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

Diaphragm repair parts
SXV-1004

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

Diaphragm repair parts
DP-2001

LOW FREQUENCY SPEAKERS

TL-1603

Overview

Designed specifically to handle the increased average power that today's amplifiers deliver. In terms of sound, emphasis is placed on low distortion and low coloration.

Voice Coil

A high maximum input of 500 watts is achieved through the use of an edgewise-wound, long-travel voice coil. Making more use of the flux within the magnetic gap, this voice coil provides higher transducing efficiency. Moreover, high linearity is maintained over a long distance for lower distortion. Both the voice-coil bobbin and the adhesive are made of a highly heat-resistant material to permit high maximum input.

Magnetic Circuit

Weighing 2kg (4.4 lbs.), a powerful ferrite magnet combines a high flux density of 1.18T and low distortion. This, along with a long-travel voice coil and new rear suspension design, contributes to the high operating efficiency of 97dB (1W,1m).

Diaphragm

The rigidity and light weight of the diaphragm permits the unit to withstand high-amplitude inputs for low-distortion output. The corrugated cloth surround is coated with a damping material to make diaphragm movement more linear and discourage cone breakup.

Housing

Warp-proof and non-resonating, the heavy die-cast aluminum frame precisely centers the diaphragm for accurate low-distortion sound reproduction.

TL-1603 Specification

Rated Impedance: 8 Ω
Frequency Range: 28-2,000 Hz
Highest Recommended Crossover: 900Hz
Rated Input Power: 200 W
Maximum Input Power: 500 W
Sound Pressure Level: 97 dB (1W, 1m)
Total Magnetic Flux: 2.60 x 10-3 Wb
Magnetic Flux Density: 1.18 T
Recommended Enclosure: 113 ～304 liter
Baffle Opening Diameter: 352 mm
Mounting Dimensions: 370 mm
Weight: 9.5 kg
Dimensions (diameter x depth): 400 x 148 mm

Theile-Small Parameters
Fs: Free Air Resonance Frequency: 28 Hz
Qms: Mechanical Q Factor: 6.8
Qes: Electrical Q Factor: 0.36
Qts: Total Q factor: 0.34
BL: Force Factor: 19.5 Tm
Mms: Mechanical Mass of Diaphragm and Free Air Load: 117 g
Mmd: Mechanical Mass of Diaphragm: 86 g
Cms: Mechanical Suspension Compliance: 2.76 x 10-4 m/N
Vas: Equivalent Acoustic Volume: 0.304 m3
Sd: Effective Piston Area: 0.0881 m2
Xmax: Max Linear Peak Excursion (0-P): 8.0 mm
Max: Excursion Before Damage (P-P): 36 mm
Vd: 705 cm3
Revc: Voice Coil Resistance: 6.6 Ω
Levc: Voice Coil Inductance at 1kHz - 1.6 mH
ηo: Relative Efficiency: 1.81%

Diaphragm repair parts
DP-1603

TL-1601a

Overview

The TL-1601a is a low-frequency speaker system conforming to the very highest technical standards. It is specifically designed to reduce all forms of distortion and coloration to a bare minimum.

Voice Coil

The TL-1601a employs an edgewise-wound long-travel type voice coil. Since the coil stays completely within the magnetic gap even during peak excursions, bass output is powerful, and distortion low, at all input levels. And since the coil makes more effective use of the flux within the magnetic gap, it provides high conversion efficiency. The voice coil bobbin and adhesive materials have high heat resistance.

Magnetic Circuit

The magnetic circuit is designed for low distortion and high efficiency. Thanks to the use of a powerful alnico ring magnet (3 lbs. 10 oz, or 1.65kg), it features an extremely high-flux density of 1.18T. In combination with light moving parts and the long-travel coil, it results in exceptionally high efficiency for a unit of this size.

Diaphragm

The cone diaphragm of the TL-1601a is made of a newly-developed tough and lightweight material that is capable of withstanding high amplitude levels without deformation. Corrugations are added across the cone surface to assure smooth response down to the extreme low end. The surround is coated with a damping material to ensure proper internal loss and linear excursions, and to reduce cone breakup in the high frequencies. The result is extremely low distortion and coloration.

Housing

The TL-1601a is mounted in a sturdy aluminum alloy diecast frame that supports the heavy magnetic circuit. The frame is essentially resonance-free.

TL-1601a Specification
Rated Impedance: 8 Ω
Frequency Range: 28-2,000 Hz
Highest Recommended Crossover: 900Hz
Rated Input Power: 150 W
Maximum Input Power: 300 W
Sound Pressure Level: 97 dB (1W, 1m)
Total Magnetic Flux: 2.60 x 10-3 Wb
Magnetic Flux Density: 1.18 T
Recommended Enclosure: 113 ～307 liter
Baffle Opening Diameter: 352 mm
Mounting Dimensions: 370 mm
Weight: 11 kg
Dimensions (diameter x depth): 400 x 167 mm

Theile-Small Parameters
Fs: Free Air Resonance Frequency: 28 Hz
Qms: Mechanical Q Factor: 6.8
Qes: Electrical Q Factor: 0.36
Qts: Total Q factor: 0.34
BL: Force Factor: 19.5 Tm
Mms: Mechanical Mass of Diaphragm and Free Air Load: 116 g
Mmd: Mechanical Mass of Diaphragm: 85 g
Cms: Mechanical Suspension Compliance: 2.79 x 10-4 m/N
Vas: Equivalent Acoustic Volume: 0.307 m3
Sd: Effective Piston Area: 0.0881 m2
Xmax: Max Linear Peak Excursion (0-P): 8.0 mm
Max: Excursion Before Damage (P-P): 36 mm
Vd: 705 cm3
Revc: Voice Coil Resistance: 6.6 Ω
Levc: Voice Coil Inductance at 1kHz - 1.6 mH
ηo: Relative Efficiency: 1.82%

Diaphragm repair parts
DP-1601a