Balanced Drive technical paper - Wavecor

TECHNICAL PAPER
Wavecor Balanced Drive Technology
Bxl [Tm]
80%
70%
60%
50%
40%
30%
20%
10%
0%
-10%
-20%
-30%
-40%
-50%
-60%
-70%
-80%
-90%
-100%
-110%
-120%
Symmetry check of Bxl curve, non-mirror less mirror curve
relative to non-mirrored Bxl value
DIRECTION OUT
TOP PLATE
DIRECTION IN
20.50
19.48
18.45
17.43
16.40
15.38
14.35
13.33
12.30
11.28
10.25
9.23
8.20
7.18
6.15
5.13
4.10
3.08
2.05
1.03
Distance [mm]
Fig. 7a. Bxl as a function of voice coil position for a traditional magnet structure as shown fig. 3a. The figure shows
the relative symmetry as the difference when measuring Bxl out/in, held relative to the value outwards.
0.00
-1.03
-2.05
-3.08
-4.10
-5.13
-6.15
-7.18
-8.20
-9.23
-10.25
-11.28
-12.30
-13.33
-14.35
-15.38
-16.40
-17.43
-18.45
-19.48
-20.50
Bxl [Tm]
80%
70%
60%
50%
40%
30%
20%
10%
0%
-10%
-20%
-30%
-40%
-50%
-60%
-70%
-80%
-90%
-100%
-110%
-120%
Symmetry check of Bxl curve, non-mirror less mirror curve
relative to non-mirrored Bxl value
DIRECTION OUT
TOP PLATE
DIRECTION IN
20.50
19.48
18.45
17.43
16.40
15.38
14.35
13.33
12.30
11.28
10.25
9.23
8.20
7.18
6.15
5.13
4.10
3.08
2.05
1.03
Distance [mm]
Fig. 7b. Bxl as a function of voice coil position for the Wavecor WF182BD01 mid/woofer. The figure shows the
relative symmetry as the difference when measuring Bxl out/in, held relative to the value outwards. Notice the
very significant improvement compared to fig. 7a.
0.00
-1.03
-2.05
-3.08
-4.10
-5.13
-6.15
-7.18
-8.20
-9.23
-10.25
-11.28
-12.30
-13.33
-14.35
-15.38
-16.40
-17.43
-18.45
-19.48
-20.50
Copyright © 2009 by Wavecor Ltd., Guangzhou, China. All rights reserved. Wavecor ® is a registered trademark of Wavecor Ltd.
For more information please visit www.Wavecor.com
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