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Driver Parameters
This page lists as full a set as possible of Thiele-Small and other electrical and mechanical parameters for full-range and wide-range drivers. Smaller amounts of driver parameter information are available on the Drivers page underneath the driver name. Driver frequency response graphs are now available for some drivers on the Response page.
Note: some of these measurements have been very accurately measured; others may not be accurate. Also, drivers can have manufacturing tolerances which result in differences of 10 percent or more. Take these measurements as guidelines only. Accurate measurements made on your individual drivers will give the best results.
A good list of Thiele-Small parameters for a large number of drivers
including ACR, Fostex, Eminence, and others is at http://www-user.tu-cottbus.de/~foellnk/params.htm
Altec
Leap T/S measurements on four Altec 755C, 8" full range drivers, courtesy of
William Eckle on the Joelist.
| Altec 755C |
Driver #1 |
Driver # |
Driver # |
Driver # |
| Re (Ohms) |
6.78 |
6.72 |
6.65 |
6.82 |
| Fs (Hz) |
53.7 |
53.8 |
56.8 |
60.6 |
| Z max @ Fs: (Ohms) |
35.9 |
34.6 |
37.1 |
37.7 |
| SD (cm2) |
214 |
214 |
214 |
214 |
| Ref Eff. |
0.6334% |
0.4687% |
0.6398% |
0.7365% |
| SPL (1W 1m) |
90.0 |
88.7 |
90.1 |
90.7 |
| Le @ 1kHz (mH) |
0.3012 |
0.3267 |
0.3179 |
0.3444 |
| Qms |
5.1476 |
5.0789 |
5.5673 |
5.2206 |
| Qes |
1.1821 |
1.2199 |
1.2156 |
1.1512 |
| Qts |
0.9613 |
0.9836 |
0.9978 |
0.9432 |
| Vas (liters) |
49.83 |
37.88 |
43.76 |
39.25 |
| Xmax (mm) |
0.3 |
0.3 |
0.3 |
0.3 |
Diatone
Thanks to Rudi Korosec for these measurements. He did the measurements
which are better than 1% on tolerance. He only measured the P610DA and P610MA (old and new
16ohm drivers). On the DA, the parameters will not change in time much because they are more than 20 years old, but
the MA have less than 1000 working hours, so they are still changing. Rudi used DPC
to get all these parameters.
|
P610 (Model, serial number) |
DA 10700 |
DA 11161 |
MA 14242 |
MA 14248 |
MA 14983 |
MA 14987 |
MA 14988 |
MA 14989 |
|
Znom (ohm) |
16 |
16 |
16 |
16 |
16 |
16 |
16 |
16 |
|
B (T) |
1.2 |
1.2 |
1.2 |
1.2 |
1.2 |
1.2 |
1.2 |
1.2 |
|
Le (mH) |
0.57 |
0.7 |
0.54 |
0.477 |
0.489 |
0.51 |
0.522 |
0.495 |
|
Fs (Hz) |
79 |
81 |
89.85 |
93.07 |
85.83 |
83.11 |
85.64 |
87.12 |
|
Re (ohms) |
14.4 |
14.4 |
14.64 |
14.9 |
14.83 |
14.83 |
14.8 |
14.66 |
|
Dd (mm) |
132 |
132 |
132 |
132 |
132 |
132 |
132 |
132 |
|
Sd (cm2) |
136.8 |
136.8 |
136.8 |
136.8 |
136.8 |
136.8 |
136.8 |
136.8 |
|
Qms |
7.56 |
7.21 |
10.696 |
9.8487 |
10.493 |
10.273 |
10.406 |
10.496 |
|
Qes |
1.387 |
1.4 |
1.8765 |
1.9152 |
1.7517 |
1.8393 |
1.86 |
1.8354 |
|
Qts |
1.172 |
1.173 |
1.5964 |
1.6034 |
1.5011 |
1.56 |
1.5779 |
1.5622 |
|
Df |
0.4 |
0.4 |
0.3132 |
0.3118 |
0.3331 |
0.3205 |
0.3169 |
0.3201 |
|
Cms (mm/N) |
0.627 |
0.618 |
0.4697 |
0.4513 |
0.525 |
0.5326 |
0.5171 |
0.5258 |
|
Vas (Liter) |
16.71 |
16.47 |
11.739 |
11.28 |
13.122 |
13.312 |
12.925 |
13.143 |
|
Bxl (N/A) |
5.8 |
5.7 |
5.4244 |
5.4295 |
5.4683 |
5.3844 |
5.3477 |
5.2679 |
|
Mms (g) |
6.45 |
6.19 |
6.6809 |
6.4799 |
6.5495 |
6.8858 |
6.6791 |
6.347 |
|
Zres (ohms) |
92.7 |
88.9 |
98.09 |
91.52 |
103.66 |
97.66 |
97.6 |
98.5 |
|
Rms (kg/s) |
0.424 |
0.439 |
0.3526 |
0.3848 |
0.3366 |
0.35 |
0.3454 |
0.331 |
|
Rme (N*s/m) |
2.312 |
2.261 |
2.0098 |
1.9785 |
2.0163 |
1.9549 |
1.9323 |
1.893 |
|
Mcost(N*s/m) |
|
|
|
|
|
|
|
|
|
F4pi (Hz) |
831 |
831 |
841.56 |
841.56 |
841.56 |
841.56 |
841.56 |
841.56 |
|
Fpist (Hz) |
932 |
932 |
932 |
932 |
932 |
932 |
932 |
932 |
|
Fmax (Hz) |
2611 |
2611 |
2643.8 |
2643.8 |
2643.8 |
2643.8 |
2643.8 |
2643.8 |
|
Hc (mm) |
|
|
|
|
|
|
|
|
|
Hg (mm) |
5.5 |
5.5 |
5.5 |
5.5 |
5.5 |
5.5 |
5.5 |
5.5 |
|
Vcd (mm) |
19.2 |
19.2 |
19.2 |
19.2 |
19.2 |
19.2 |
19.2 |
19.2 |
|
Xmax (mm) |
2 |
2 |
2 |
2 |
2 |
2 |
2 |
2 |
|
Vd (cm3) |
27 |
27 |
27 |
27 |
27 |
27 |
27 |
27 |
|
Pe (W) |
7 |
7 |
7 |
7 |
7 |
7 |
7 |
7 |
|
Gamma (m/s2*A) |
894 |
924 |
811.96 |
837.9 |
834.91 |
781.95 |
800.65 |
829.98 |
|
no (%) |
0.577 |
0.612 |
0.4412 |
0.4617 |
0.4606 |
0.404 |
0.4244 |
0.4604 |
|
Pn (W) |
4.2 |
3.9 |
5.4366 |
5.1959 |
5.2086 |
5.938 |
5.6524 |
5.2103 |
|
SPL (dB) |
89.8 |
90.1 |
88.647 |
88.843 |
88.833 |
88.264 |
88.478 |
88.831 |
|
SPLmax (dB) |
99.8 |
100.1 |
94.098 |
94.294 |
94.284 |
93.715 |
93.929 |
94.282 |
|
USPL (dB) |
87.2 |
87.5 |
85.977 |
86.097 |
86.107 |
85.538 |
85.761 |
86.156 |
|
EBP (Hz) |
57 |
58 |
47.881 |
48.595 |
48.997 |
45.185 |
46.044 |
47.467 |
|
Dvol (dm3) |
0.262 |
0.262 |
0.262 |
0.262 |
0.262 |
0.262 |
0.262 |
0.262 |
|
Res (ohms) |
78.3 |
74.5 |
83.45 |
76.62 |
88.83 |
82.83 |
82.8 |
83.84 |
|
Ces (uF) |
194 |
189.5 |
227.05 |
219.81 |
219.03 |
237.51 |
233.56 |
228.71 |
|
Les (mH) |
20.82 |
20.18 |
13.819 |
13.304 |
15.698 |
15.44 |
14.788 |
14.592 |
EMI 92390P 15ohm driver
Thanks again to Rudi Korosec for these measurements:
| Fs |
40.06 Hz |
| Vas |
49.1 litres |
| Qts |
0.58 |
| Qes |
0.81 |
| Qms |
2.09 |
| Mms |
68.63g |
| Sd |
388 cm2 |
| Bl |
16.39 T*m |
| Re |
12.53 ohms |
| Le |
3.59mH |
| Eff (SPL) |
91.08 dB |
The SPL number is not real because the calculator is considering 8ohms, the driver is
15ohm! On my open baffle I measured 94 dB/1W/1m.
Jordan JX 92S
From EJJordan website:
|
free air resonance
|
FO Hz
|
45.00
|
|
mechanical Q
|
Qm
|
1.35
|
|
electrical Q
|
Qe
|
0.58
|
|
total Q
|
Qt
|
0.40
|
|
mechanical resistance
|
Rm N*s/m
|
1.48
|
|
force factor
|
B*1 T*m
|
4.00
|
|
DC resistance
|
Re ohms
|
4.50
|
|
dynamic mass
|
Md grams
|
7.00
|
|
system compliance
|
Cs m/N*E-0.4
|
17.70
|
|
equiv. air volume
|
Vas ltr
|
15.28
|
|
cone area
|
Sd sq.cms
|
78.54
|
|
sound pressure level
|
SPL 1m 1w
|
88.00
|
|
minimum box volume (IB)
|
litres
|
3.00
|
|
maximum box volume (vented)
|
litres
|
12.50
|
|
power, max continuous
|
watts
|
50
|
|
power, music, in system
|
watts
|
100
|
|
Xmax p-p
|
mm
|
9.00
|
Lowther DX3
T/S parameters as measured by Nick McKinney at Lambda
Acoustics
| Fs |
56 Hz |
| Vas |
54 liters |
| Qts |
0.21 |
| Qes |
0.22 |
| Qms |
6.33 |
| Mms |
8.91g |
| Sd |
206 cm2 |
| Bl |
10.8 T*m |
| Re |
8.0 ohms |
| Cms |
0.91 mm/N |
| "no" |
4.22% |
| Eff |
98.3 dB 1W/1m |
Frequency response graph, and graph zoomed to show bumps (ALL drivers have these problems, not just Lowthers).
Lowther PM6A
Thanks to Mark Winquist. Drivers measured after 30 hours playing music and 6 Hours
break-in at 30Hz.
| |
Driver 1 |
Driver 2 |
| Fs |
60.0 Hz |
58.5 Hz |
| Re |
7.8 Ohms |
7.8 Ohms |
| Qes |
0.3479 |
0.36704 |
| Qms |
4.528 |
4.221 |
| Qts |
0.3231 |
0.33768 |
| Vas |
1.1894 cu ft |
1.21065 cu ft |
Lowther DX2
from Klang & Ton, May 2000.
| Fs |
48 Hz |
| Vas |
101 liters |
| Qts |
0.24 |
| Qes |
0.26 |
| Qms |
4.05 |
| Mms |
6.0 g |
| Sd |
201 cm2 |
| Bl |
6.97 T*m |
| Re |
7.5 ohm |
| Cms |
1.8 mm/N |
| "no" |
4.28% |
| Z |
8 ohm |
| Rms |
0.49 kg/s |
Lowther PM2A
from Klang & Ton, May 2000.
| Fs |
46 Hz |
| Vas |
115 liters |
| Qts |
0.19 |
| Qes |
0.2 |
| Qms |
3.36 |
| Mms |
5.8 g |
| Sd |
201 cm2 |
| Bl |
6.65 T*m |
| Re |
7.5 ohm |
| Cms |
2.03 mm/N |
| no" |
4.28% |
| Z |
8 ohm |
| Rms |
0.55 kg/s |
MCM
courtesy of Mike, thanks!
| Driver |
1855 (#1) |
1855 (#2) |
1870 (#1) |
1870 (#2) |
| Fs (Hz) |
55.5 |
57.4 |
62.6 |
64.0 |
| Vas (cu ft) |
0.20 |
0.19 |
0.21 |
0.20 |
| Qts |
0.41 |
0.37 |
0.66 |
0.62 |
| Qes |
0.46 |
0.41 |
0.94 |
0.86 |
| Qms |
3.80 |
3.66 |
2.24 |
2.26 |
| Mms (grams) |
10.2 |
10.1 |
7.60 |
7.60 |
| Sd (sq in) |
11.0 |
11.0 |
11.0 |
11.0 |
| Bl (T.m) |
7.37 |
7.85 |
4.86 |
5.12 |
| Re (Ohms) |
7.00 |
7.00 |
7.46 |
7.40 |
| Le (mH) |
1.55 |
1.68 |
0.52 |
0.55 |
| SPL (1W at 1m) |
85.2 |
85.8 |
83.8 |
84.3 |
Monacor
SP-200X
| Impedance (Z) |
8 Ohm |
| Free air resonance (fs) |
50Hz |
| Max. frequency range |
f3–15,000Hz |
| Music power |
70 W MIN |
| Power rating (P) |
35 W RMS |
| SPL (1W/1m) |
92dB |
| Suspension compl. (Cms) |
0.77mm/N |
| Moving mass (Mms) |
11.5g |
| Mechanical Q factor (Qms) |
1.96 |
| Electrical Q factor (Qes) |
0.7 |
| Total Q factor (Qts) |
0.52 |
| Compl. equival. vol. (Vas) |
48 l |
| DC resistance (Re) |
7.2 Ohm |
| Force factor (BxL) |
6.1Tm |
| Voice coil induct. (Le) |
0.3mH |
| Voice coil diameter |
25.5mm |
| Voice coil former |
aluminium |
| Linear excursion (X
) |
± 1.6mm |
| Eff. cone area (Sd) |
210cm² |
| Magnet weight |
17.7oz. |
| Weight |
1.3kg |
SP-60X
| Impedance (Z) |
8 Ohm |
| Free air resonance (fs) |
60Hz |
| Max. frequency range |
f3–20,000Hz |
| Music power |
60WMIN |
| Power rating (P) |
30WRMS |
| SPL (1W/1m) |
89dB |
| Suspension compl. (Cms) |
1.19mm/N |
| Moving mass (Mms) |
5.9g |
| Mechanical Q factor (Qms) |
2.17 |
| Electrical Q factor (Qes) |
0.53 |
| Total Q factor (Qts) |
0.42 |
| Compl. equival. vol. (Vas) |
9 l |
| DC resistance (Re) |
6.2 Ohm |
| Force factor (BxL) |
5.1Tm |
| Voice coil induct. (Le) |
0.4mH |
| Voice coil diameter |
25.5mm |
| Voice coil former |
aluminium |
| Linear excursion (X
) |
± 1.3mm |
| Eff. cone area (Sd) |
80cm² |
| Magnet weight |
13oz. |
| Weight |
1.1kg |
Norelco / Philips
Parameters by Don Carron measured on 2 drivers (thanks).
| Fs |
44 Hz, 48 Hz |
| Vas |
99 liters |
| Qts |
0.49 |
| Qes |
0.626 |
| Qms |
2.28 |
| Bl |
6.65 T*m |
| Re |
5.2 ohm |
| Xmax |
1.4mm (+- 0.7mm) |
| SPL ref |
97 dB/8R |
| Z |
8 ohm |
| Pe |
15W |
Orca Axon
| Fs |
78.77 Hz |
| Rcc |
3.43 Ohms |
| Qes |
0.74 |
| Qms |
3.42 |
| Qts |
0.61 |
| Mms |
3.16 g |
| Sd |
45.36 cm2 |
| Vas |
3.74 liters |
| Lvc |
0.12 ? mH |
| SPL ref |
85.8 dB/2.83V/m |
| Xmax |
2.5 mm |
| Nominal Power |
30 Watts |
Pioneer
The 8 inch full range B20FU20-51FW T/S parameters from John Wyckoff
| Fs |
39 Hz |
| Vas |
2.0 cu. ft. |
| Qts |
0.45 |
| Qes |
0.56 |
| Qms |
2.4 |
| Re |
6.25 ohms |
| Le |
0.6 mH |
| BL |
6.9 T/m |
| Eff (SPL) |
89.8 dB 1W/1m |
Radio Shack
RS 40-1354 specs from Radio Shack:
|
Frequency response |
50-14,000 Hz |
| Fs |
50 Hz |
| Eff (SPL) |
90 dB |
| Impedence |
8 ohms |
|
Nominal Power |
40 W |
|
Maximum power |
40 W |
|
Magnet weight |
10 oz (283 g) |
|
Speaker Weight |
30.6 oz (865 g) |
RS 40-1354 specs from Brian (thanks).
RS 40-1354 specs measured by Paul Joppa (thanks) from Bottlehead
forum (tested drivers right out of the box. With some break-in the stiffness of the suspension will drop, lowering resonance and Q (10%?) and raising Vas (20%?) ):
| Fs |
56.0 Hz |
|
Vas |
0.013 m^3 = 0.457 ft^3 |
| Qts |
0.46 |
| Qes |
0.537 |
| Qms |
3.46 |
| Mms |
6.16 g |
| Sd |
0.0083 m^2 |
| Re |
7.09 ohm |
|
eta (2 pi) |
0.414% |
| Eff (SPL) |
88.7dB/2.83v/m |
Specifications for the 40-1354 posted on Bottlehead Forum by Greg on 1/20/2000 (thanks):
Fs = 71.5, Vas = 7.3 liters, Qts = 0.49. Qms = 3.85
Radio Shack 40-1271C drivers after break in (from John Wyckoff). Three samples:
| Fs |
84 |
81.7 |
83.1 |
Hz |
| Vas |
1.1 |
1.2 |
1.17 |
cu ft |
| Qts |
2.4 |
2.45 |
2.43 |
|
| Qes |
3.3 |
3.3 |
3.3 |
|
| Qms |
9.5 |
9.4 |
9.45 |
|
| Mms |
7.5 |
7.46 |
7.5 |
g |
| Bl |
3.1 |
3 |
3 |
T/m |
| Re |
7.75 |
8.1 |
7.9 |
ohm |
| Le |
0.18 |
0.21 |
0.2 |
mH |
| Eff (SPL) |
89.5 |
89.47 |
89.45 |
dB 1W/m |
These drivers are finding a following among the "cheap-n-cheerful" fans of Radio Shack drivers, some people liking them better overall than the 1197 and 1354. Due to the high Qts, use these
in an open baffle arrangement.
40-1286C specs on 8" full range woofer by Radio Shack (thanks Mike):
| Fs |
53 Hz |
| Vas |
1.73 cu. ft. |
| Qts |
1.16 |
| Qes |
1.43 |
| Qms |
6.06 |
| Re |
7.6 Ohms |
40-1297C specifications. These are 4x10 inch elliptical drivers featuring a fairly large magnet (similar size to 1354).
Out of the box:
| Fs |
110 Hz |
| Vas |
0.31 cu ft |
| Qms |
7.14 |
| Qes |
1.18 |
| Qts |
1.01 |
| Xmax |
0.08 mm (?) |
Guessed values after break-in:
| Fs |
93 Hz |
| Vas |
0.37 cu ft |
| Qms |
7.14 |
| Qes |
0.85 |
| Qts |
0.76 |
TangBand
T/S for TangBand W4-656S (fresh from box) from Mike (thanks!) (delta mass 15 gram)
driver#1 driver#2
Fs 82.4 80.0 Hz
Qes 0.57 0.59
Qms 2.35 2.51
Qts 0.46 0.48
Re 6.03 6.03 Ohm
Sd 8.29 8.29 sq. inches
Vas 0.11 0.11 cu. feet
Le 0.76 0.80 mH
Eff 86.9 86.1 1W/1m
Bl 5.03 5.11 Tm
Cm 806 773 m/N
Mm 4.63 5.11 grams
Rm 1.02 1.03 Ns/m
|
