Tannoy ST-100 Supertweeters

Here we have a pair of Supertweeters from loudspeaker specialists Tannoy. They are in good condition with just some light cosmetic wear, supplied in original factory packaging along with manual, 4 adaptor plugs and our normal three month warranty.
Tannoy Said….
Always an innovator where quality sound reproduction is concerned, Tannoy has continued this tradition by being at the forefront of the development of WideBand™ technology. All Prestige models except Autograph Mini are compatible with Tannoy’s Supertweeter™ designs, providing the opportunity to extend high-frequency response to above 50 kHz, thereby providing all of the bandwidth required for today’s wide bandwidth digital recording formats.
In fact the Supertweeter™ only starts working at a point that is close to what is generally considered the limit of the audible frequency band for most adults. The Dual Concentric™ in the main loudspeaker, still working to its full frequency specifications, continues to provide the heart of the musical information as a coherent point source. However, the extreme high frequencies are then resolved by the Supertweeter™ to provide incredible, wide bandwidth detail and enlivening the performance by increasing the tonal accuracy of individual instruments for more natural and true to life music reproduction.
The Tannoy Supertweeter™ extends the high frequency capability of the complete loudspeaker system out to beyond 50kHz. This in turn corrects the time and phase response at the upper end of audibility to deliver enhanced
accuracy and spaciousness, improved clarity within the essential mid band area and even an enhancement of the definition and impact of low frequencies.
Benefits are heard clearly with any source material, regardless of bandwidth, therefore ensuring that a Tannoy Supertweeter™ is an essential accessory.
The ST100 Supertweeter is designed to provide the extended high frequency response demanded by modern programme material and sources. Your main loudspeakers still provide the heart of the musical information, but at extreme high frequencies are supplemented by the wideband Supertweeter.
Musical information contains transient information, beyond the range of human hearing for pure tones. For music to be accurately reproduced, we have found it essential to accurately preserve this information.
The unit will find application with a broad range of quality loudspeaker systems. Adjustments are provided for crossover frequency and level to enable accurate matching.
Features:
High stiffness titanium dome to minimise effects of dome break-up and extend frequency response.
Copper clad aluminium voice coil on aluminium former for high power handling.
Neodymium magnet system also extends frequency response by minimising eddy current losses in voice coil.
Provision for driver magnet system earthing (as in Prestige HE series), to avoid interference and information masking caused by radio interference.
High purity (99.999%) solid silver internal wiring, PTFE coated dielectric.
Gold plated terminals, adjustment screws and circuit board for high signal transparency.
Radio Frequency quality inductors in crossover for good high frequency characteristics.
Non-Inductive Planar Thick Film resistors on ceramic substrates, avoid losses associated with wire wound types.
High quality polycarbonate film capacitors, selected for high frequency use.
Unique Tannoy Performance Platform gives stable support and accurate variable adjustment.
Specifications:
Recommended Amplifier Power: Up to 250 W
Power Rating To DIN IEC 268: 135 W RMS; 550 W peak
Maximum Sensitivity (2.83 V @ 1 m): 95 dB
Nominal Impedance: 8 Ω
Frequency Response (- 6 dB): To 54 kHz, usable output (- 18 dB) to 100 kHz
Driver Unit Type: 25 mm diameter 25 micron titanium dome, 24 Karat vapour deposited gold finish, with neodymium magnet system
Crossover Type: 3ʳᵈ order compensated high pass
Crossover Frequency: 14, 16 or 18 kHz adjustable
Level Adjustment: 87 dB, 89 dB, 91 dB, 93 dB, 95dB
Dimensions: 150 mm diameter
Weight: 6.5 kg