Philips (B&O & DUX) AD5061/SQ8 mid-range, 1976, made in Belgium

Link: verheijde

Diffuser - paper, fabric suspension.

Cone Ø 100mm.

AD5061/SQ main difference sealed metal frame back with 680 Hz Fs
AD5061/M Midrange version with whizzer cone, probably for table radios
AD5060/W Woofer version with rubber edge and Fs = 65 Hz, large peak in FR.
Note these power differences for the AD5060/W8 vs 62 versions of the woofer:
AD5060/W8 RMS PHC = 10, Operating = 8, P. Max = 15 W
AD5062/W8 RMS PHC = 20, Operating = 8, P. Max = 40 W
More data is given for the woofer which might also apply to the SQ version:
DC resistance: 7 for 8 ohm, 3.2 for 4 ohm
Moving mass: 6 g
BL: 5
Piston diam: 87 mm
Piston area: 59 mm^2
Magnet: 230 g
Air gap height: 5 mm
VC height: 6.3
Fs: 65
Compliance: 1.25 mm/N
Vas: 5.2 liters
Qms: 3.8
Qes: .66
Qts: .56