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"Thiele & Small Parameters"

In the table below you will find "Thiele & Small" parameters for many Tannoy dual concentric speakers.

 

In general, the older Tannoy drive units had stiffer suspensions with higher resonant frequencies - making large cabinets necessary to get good bass extension below 40Hz. Another point to note is that the low frequency resonance for the Monitor Silver, Monitor Red and Monitor Gold may higher than the nominal figures published when the drive units were new. The plasticiser used on the surround may have stiffened with time, thus raising the resonant frequency.

 


Tannoy Speakers

 

Monitor Silver 12"

 Monitor Silver 15"

 Monitor Red III LZ

 Monitor Red 12"

 Monitor Red 15"
 Vas, volume equivalent compliance  99.7 litres  266 litre  99.6 litre  266 litre
 Fs, free air resonance  49.7 Hz  32 Hz  27 Hz  48.6 Hz 32 Hz
 Qt, total Q-factor  0.24  0.26  0.154 0.26
 Qa, mechanical & acoustic Q  1.29  1.3   6.25 1.3
 Qe, electrical Q  0.29  0.32   0.158 0.32
 Mmd, Dynamic Mass, excl. air load  40.2 g  72 g   43 g 72 g
 Cms, dynamic compliance  0.26 mm/N  0.32 mm/N   0.249 mm/N 0.32 mm/N
 Mma, air load in free air
 Sd, piston radiating area  0.0527 m2  0.077 m2   0.0531 m2 0.077 m2
 B, gap flux
 L, voice coil conductor length (in gap)
 BL, force factor (=B * L), N/A  22.4  21.25   22.35 21.25
 Re, voice coil resistance  11.8 Ohm  9.5   6 Ohm 9.5 Ohm
 Re+Res, resistance at Fs
 Z, efficiency into half-space (2-pi)
 VD, Peak linear displacement volume
 a, effective piston radius
 Pth, thermal power rating  15 W  30 W  50 W
 Sensitivity (@2.83V, 1m, 20C)  93.4 dB  93 dB  97.8 dB 93 dB
 Rms, mechanical resistance (mech-Ohm)  9.76   2.1 11.6
 LF Voice Coil Diameter  2.5"  2"  2"
 HF Voice Coil Diameter  2"  2"  2"
 HF Gap Flux, B  1.5 T  1.5 T  1.8 T
 Magnet Mass  6.25 lb  7.5 lb  13 lb
LF to HF crossover frequency  1700 Hz  1700 Hz  1000 Hz


Note: Data for Monitor Silver 12" and 15" units sourced from Tannoy North America ( supplied courtesy swangens@rocsoft.net ).
Data for Monitor Red 12" & 15" units sourced from Tannoy UK data ( supplied courtesy pettinao@tiscalinet.it )

 

 

 

 Mon. Gold IIILZ

 Gold 12"
(see also
12" Gold  RS)		 Gold 15" HPD 295A HPD 315A HPD 385A
 Vas, volume equivalent compliance  99.7 litres  350 litres  15 cu ft *
 Fs, free air resonance  30 Hz  49.7 Hz  26 Hz  22 Hz  20 Hz  20 Hz *
 Qt, total Q-factor  0.24  0.2  0.2 *
 Qa, mechanical & acoustic Q  1.29  2
 Qe, electrical Q  0.29  0.22
 Mmd, Dynamic Mass, excl. air load  40.2 g  90 g
 Cms, dynamic compliance  0.26 mm/N  0.42 mm/N
 Mma, air load in free air
 Sd, piston radiating area  0.0528 m2  0.077 m2  0.0528 m2  0.077 m2
 B, gap flux  1.0 T  1.15 T  1.35 T  1.35 T *
 L, voice coil conductor length (in gap)  14.1 m *
 BL, force factor (=B*L) Newtons per Amp  22.4 N/A  19.2 N/A  16 N/A  16 N/A  19 N/A
 Re, voice coil resistance  11.8 Ohm  5.5 Ohm  5.5 Ohm
 Re+Res, resistance at Fs
 Z, efficiency into half-space (2-pi)
 VD, Peak linear displacement volume
 a, effective piston radius
 Pth, thermal power rating  15 W  30 W  50 W  50 W  60 W  85 W
 Sensitivity (@2.83V, 1m, 20C)  93.4 dB  94.8 dB
 Rms, mechanical resistance (mech-Ohm)  9.76  7.45
 LF Voice Coil Diameter  2.5"  2"  2"  2"  2"  2"
 HF Voice Coil Diameter  2"  2"   2"  2"  2"  2"
 HF Gap Flux, B  1.5 T  1.5 T  1.8 T
 Magnet Mass  6.25 lb  7.5 lb  13 lb
 LF to HF crossover frequency  1200 Hz  1000 Hz  1000 Hz   1000 Hz   1000 Hz   1000 Hz


Note: Data for Monitor Gold 12" and 15" units sourced from Tannoy UK data (supplied courtesy lokeks@yahoo.com.sg )
Data for Monitor-HPD 15" taken from private measurements (*) and some published Tannoy data.

 

 

 

DU386 / K3828 K3808 K3838 Monitor Gold 12" Rubber Surround:
LSU/HF/12/8RS		 3836
 Vas, volume equivalent compliance 0.483 m3  8.8 cu ft  17 cu ft  206.6 litres  430 litres
 Fs, free air resonance  22 Hz  35 Hz  22 Hz  27.85 Hz  27.4 Hz
 Qt, total Q-factor  0.18  0.16  0.18  0.287  0.427
 Qa, mechanical & acoustic Q  2.4  1.1  2.4  5.58  2.1
 Qe, electrical Q  0.2  0.19  0.19  0.302  0.537
 Mmd, Dynamic Mass, excl. air load  68 g  47 g  68 g  61.05 g
 Cms, dynamic compliance  0.58 mm/N  0.3 mm/N  0.58 mm/N  0.535 mm/N
 Mma, air load in free air  22 g  22 g  22 g
 Sd, piston radiating area  0.077 m2  0.077 m2  0.077 m2
 B, gap flux  0.78 T  0.78 T  0.78 T
 L, voice coil conductor length (in gap)  24 m  24 m  24 m
 BL, force factor (=B*L) Newtons per Amp  18.7 N/A  18.7 N/A  18.7 N/A
 Re, voice coil resistance  5.7 Ohm  5.5 Ohm  5.5 Ohm  5.19 Ohm  5.5
 Re+Res, resistance at Fs  77.5 Ohm  38 Ohm  70 Ohm
 Z, efficiency into half-space (2-pi)  2.6 %  5.4%  3.8%
 VD, Peak linear displacement volume  0.00031 m3  0.00031 m3  0.00031 m3
 a, effective piston radius  0.156 m  0.156 m  0.156 m
 Pth, thermal power rating  85 W  120 W  120 W
 Sensitivity (@2.83V, 1m, 20C)  94 dB  92 dB  94 dB
 Rms, mechanical resistance (mech-Ohm)

Note: All K-Series and DC-series data from published Tannoy UK data.
Test results for Monitor Gold 12" Rubber-Surround unit kindly supplied by David Meraner [dmeraner2@worldnet.att.net].
Parameters for 3836 drive unit courtesy Elton Toma - elton_toma@aar.com (results averaged from 2 drive units).

 

 

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