Wharfedale opus user manual 250mm 10”, 200mm 8”, 170mm 6.5”

opus

	250mm 10”	200mm 8”	170mm 6.5”
	Aluminium/Steel
Frame material		Aluminium/Steel	Aluminium/Steel
Cone & dome material	Woven carbon fibres	Woven carbon fibres	Woven carbon fibres
Surround	s r b p Single roll	s r b p Single roll	s r b p Single roll
Spiders	Single	Single	Single
Coil size & type	38mm Aluminium	38mm Aluminium	25mm Aluminium
Winding spec	2 layer round cu x 15mm	2 layer round cu x 10mm	2 layer round cu x 11mm
Magnet (D1 x D2 x H)	115 x 56 x 20 ferrite	115 x 56 x 20 ferrite	80 x 32 x 15 ferrite
Magnet weight	760gm	760gm	300gm
Gap flux density	1.1T	1.1 T	0.77 T
Top plate thickness	6mm	6mm	6mm
Optimum working range	25Hz – 500Hz	25Hz–800Hz	40Hz–1000Hz
Venting	Coil, pole	Coil, pole	Coil, pole
Thiele Small parameters
Effective cone diameter	200mm	165mm	140mm
Re	8Ω	4.5Ω	15.5Ω
Fs	39Hz	39Hz	54Hz
Qms	3.12	2.31	3.33
Qes	1.08	0.57	1.35
Qts	0.8	0.45	0.96
Mms	38gm	29gm	17gm
Cms	0.43mm/N	0.55mm/N	0.49mm/N
Vas	59L	34L	16L
BL	8.38f/m	7.64t/m	8.26

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