ZH02800

TW 104.28 N/Ag

Tweeter 104 mm, 28 mm voice coil, Neodymium

Engineering concept

Years of laboratory testing and listening, supported by sophisticated measurements, have led us to develop tweeters characterized by precise choices: RS tweeters use silk domes, a lightweight material with consistent characteristics that lends itself to various treatments to enhance its dynamic performance. The dome undergoes both internal and external treatments to create a mini-sandwich structure, preventing deformation. The suspension is treated with a rubber-based solution for increased stability and elasticity. The voice coil winding uses flat copper clad aluminum wire for maximum lightness and optimal magnetic gap fill; the former is made of aluminium. The neodymium magnetic circuit, is ventilated and the pole is covered with a silver cap to maintain consistent impedance at high frequencies, ensuring better amplifier interfacing. The tweeter features a rear aluminium cup designed for enhanced cooling radiation. This cup forms a rear damped chamber, reducing the tweeter’s resonance at 500 Hz and enabling a cutoff frequency well below the crossover point. The volume created by the rear dome and its associated ducts is meticulously engineered to minimize resonances and is dampened with sound-absorbing material. This design reduces the impedance peak at the tweeter's resonance, allowing for simpler and less invasive crossovers, thereby optimizing overall sound quality. Every element of the tweeter design concurs in the quest for the purest sound, the ultimate target for RS.

Characteristics

  • Treated silk dome
  • Damping dome treatment
  • Large roll surround
  • 1.1” voice coil with aluminium flat wire and aluminium former
  • Rear damped chamber for low resonant frequency
  • Neodymium magnet circuit with silver shorting ring and damping material inside
  • Ventilated top plate
  • Aluminium flange

Generic data

Nominal Diameter – 104 mm
Nominal Impedance – 8 Ω
Rated Power AES – 25 W
Continuous Program Power – 50 W
Rated Noise Power (IEC 60268-5) – 120W
Sensitivity @ 1W/1m – 91.5 dB
Voice Coil Diameter – 28 mm (1.1″)
Voice Coil Winding Depth – 2.7 mm
Magnetic Gap Depth – 3.0 mm
Flux Density – 1.43 T
Magnet Weight – 92 g
Recommended Crossover Frequency – 1.5 kHz

Thiele & Small Parameters

Re – 6.0 Ω
Fs – 520 Hz
Qms – 2.12
Qes – 0.48
Qts – 0.39
Mms – 0.5 g
Cms – 203 µm/N
Bxl – 4.43 Tm
Vas – 0.02 l
Sd – 9.1 cm2
η0 – 0.67 %
Le (1kHz) – 0.01 mH

Constructive Characteristics

Magnet – Neodymium
Voice Coil Winding Material – Aluminium Flat Wire
Voice Coil Former Material – Aluminium
Diaphragm – Treated Silk
Ferrofluid in Air Gap – No
Flange – Aluminium
Spare Part Code – ZH02800-8 SP

Mounting Information

Overall Diameter – 104 mm
Baffle Cutout Diameter – 73 mm
Mounting Holes – 4 holes ø4,5 on ø92 mm
Total Depth – 37.6 mm
Net Weight – 0.4 kg
Included: sealing gasket, fixing screws, griff-nuts

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