# Tannoy K2558 T&S parameters

Below are my latest measurements on my personal 10" Dual-Concentric Tannoy K2558.
They are living in sealed Dover cabinets (1981)
I used the latest Woofertester 2 Ver 5.00, the original Smith & Larson's software.

For the first time, I used the sealed box method.
It seems to me that the measurements are more accurate than with the added-mass one or efficiency one.
You need to build a sealed box but it's worth doing it.
I tried the three methods proposed by Messrs. Smith and Larson.
When using the sealed box method, the calculation of Vas is less random.

Bernard.

Speaker 1

TANNOY K2558 SN 840593 THIELE SMALL PARAMETERS
Completed: Mon Jul 11 15:32:02 2011
----------------------------------------------------------
Re = 5.5328 ohms
Fs = 24.5351 Hz
Zmax = 36.4333 ohms
Ro = 14.149 ohms
F0 = 13.854 Hz
F1 = 42.861 Hz
Fmin = 188.716 Hz
Qes = 0.3886
Qms = 2.1705
Qts = 0.3296
Le = 0.995019 mH (at 1 kHz)
XLe = 11.501 ohms @1k
PLe = 32.929 Degrees @1kHz
Diam = 205.2300 mm ( 8.0799 in )
Sd =33080.4624 mm^2( 51.2748 in^2)
Vas = 138.1418 L ( 4.8784 ft^3)
BL = 10.1943 N/A
Mms = 47.3528 g
Cms = 888.6230 uM/N
Kms = 1125.3367 N/M
Rms = 3.3632 R mechanical
Efficiency = 0.4933 %
Sensitivity= 88.9490 dB @1W/1m
Sensitivity= 90.5504 dB @2.83Vrms/1m
Krm = 2.011E-03 ohms Freq dependent resistance
Erm = 871.019E-03 Rem=Krm*(2*pi*f)^Erm
Kxm = 23.723E-03 Henries Freq dependent reactance
Exm = 643.539E-03 Xem=Kxm*(2*pi*f)^Exm
----------------------------------------------------------
Ftest = 56.551 Hz
Ftest/Fms = 2.3049
Fbox(test) = 56.551 Hz
Test sealed Box used = 32.032 L (30.318 L [Dover] + 0,073 L [hole in the box] + 1,641 L [cone volume])
Test Box (Ft=1.10*Fms) = 657.818 L (for Ft=26.989Hz)
Test Box (Ft=1.25*Fms) = 245.586 L (for Ft=30.669Hz)
Qleak = 0.000 (Box & Driver Air leaks)

+++++++++++++++++++++++++++++++++++++++

Speaker 2

TANNOY K2558 SN 840707 THIELE SMALL PARAMETERS
Completed: Mon Jul 11 16:01:29 2011
----------------------------------------------------------
Re = 6.4020 ohms
Fs = 24.8709 Hz
Zmax = 40.0076 ohms
Ro = 15.828 ohms
F0 = 15.053 Hz
F1 = 44.261 Hz
Fmin = 165.251 Hz
Qes = 0.4055
Qms = 2.1287
Qts = 0.3406
Le = 0.972643 mH @1k
XLe = 11.718 ohms @1k
PLe = 31.436 Degrees @1kHz
Diam = 205.2300 mm ( 8.0799 in )
Sd =33080.4624 mm^2( 51.2748 in^2)
Vas = 139.8455 L ( 4.9386 ft^3)
BL = 10.5973 N/A
Mms = 45.5214 g
Cms = 899.5818 uM/N
Kms = 1111.6277 N/M
Rms = 3.3418 R mechanical
Efficiency = 0.4985 %
Sensitivity= 88.9946 dB @1W/1m
Sensitivity= 89.9624 dB @2.83Vrms/1m
Krm = 278.944E-06 ohms Freq dependent resistance
Erm = 973.276E-03 Rem=Krm*(2*pi*f)^Erm
Kxm = 47.875E-03 Henries Freq dependent reactance
Exm = 543.645E-03 Xem=Kxm*(2*pi*f)^Exm
----------------------------------------------------------
Ftest = 57.612 Hz
Ftest/Fms = 2.3164
Fbox(test) = 57.612 Hz
Test sealed Box used = 32.032 L (30.318 L [Dover] + 0,073 L [hole in the box] + 1,641 L [cone volume])
Test Box (Ft=1.10*Fms) = 665.931 L (for Ft=27.358Hz)
Test Box (Ft=1.25*Fms) = 248.614 L (for Ft=31.089Hz)
Qleak = 0.000 (Box & Driver Air leaks)

© PE1MMK Hans Hilberink, thanks to Bernard for sending the data, last update:  15-07-2011.