T/S params of the HPD 385/8 drivers measured:
Re 5,2 Ohm Fs 14,7 Hz Qms 6,25 Qes 0,19 Qts 0,19 L(1kHz) 2,35mH L(10kHz) 1,13mH Mms 72g Ø 320 mm Vas 830 L Sensitivity (2.83V/1m) 92 dB*
T&S parameters as supplied by Miroslav Ivanek and measured by Zvonimir Vukovojac:
(with Clio, "added mass" method, see for more info about this method the SRM 12 T&S parameters also on this site).
Drivers were measured after surround replacement purchased from Tom Manning of Speakerbits.
T/S params of the HPD 385 drivers supplied by Tannoy:
Re 5,7 Ohm Fs 22 Hz Qms 2,4 Qes 0,2 Qts 0,18 Bl 18.72 N/A Cms 0.58 mm/N Mms 90g Sd 770 sq. cm Vas 483 L Rms 5.1 Mech Ohm Sensitivity (2.83V/1m) 94.3 dB
T/S params of the HPD 315 drivers measured:
Re 5.5 Ohm Fs 25 Hz Mms 62 g Qes 0.22 Qms 1.75 Qts 0.2 Bl 15.6 N/A Cms 0.65 mm/N Vas 276 L Rms 5.6 Mech Ohm Sd 550 q. cm Sensitivity (2.83V/1m) 91 dB*
T/S params of the HPD 315 drivers: as supplied by Tannoy:
(* = not measured, supplied by Tannoy, although later specifications by Tannoy, like the one above, give higher values that could not be verified in any measurement.)
© PE1MMK Hans Hilberink, Miroslav Ivanek, Zvonimir Vukovojac, Marcello Pellerano, Panos Tsitimakis,
last update 29-10-2002.