C158-8-085*

Ceramic Bass-Midrange

Dome material	CerAMIC
Application	Bass-Midrange
Overall diameter	158 MM
Cutout Diameter	137 MM
Overall depth	82 MM
Motor assembly depth	34 MM
Motor assembly diameter	85 MM

Main Features

overhung motor design
25 mm Titanium VC Former
Soft Rubber Surround
Vented VC, Pole Piece & Spider
38 HZ - 3 KHZ in vented Box

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CLOSED BOX DESIGN PARAMETERS

Vb: 8.5L, -11dB @ 40Hz, F-3dB: 70Hz, Q: 0.71 (typical)
Vb: 22L, -8.5dB @ 40Hz, F-3dB: 70Hz, Q: 0.50 (extended bass)

VENTED BOX DESIGN PARAMETERS

Vb: 15L, Port diameter: 50mm, Length: 190mm, Fres: 41Hz, F-3dB: 45Hz, Q: 0.58 (typical)
Vb: 22L, Port diameter: 50mm, Length: 130mm, Fres: 40Hz, F-3dB: 40Hz, Q: 0.50 (extended bass)
Vb: 12L, Port diameter: 50mm, Length: 200mm, Fres: 45Hz, F-3dB: 49Hz, Q: 0.61 (0.7dB Ripple @ 100Hz)

HIGHLIGHTS

6.25 inch bass-midrange for small bookshelf monitors or slim floorstanders.
Small and light voice coil with 25mm titanium.
Voice coil former for high midrange resolution.
Long excursion design for high SPL capabilities.

* also available as 4 Ω Version

Mechanical Data

Specification	Value	Unit
Overall diameter	158	mm
Cutout diameter	137	mm
Min. frontplate thickness	6	mm
Overall depth	82	mm
Motor assembly depth	34	mm
Motor assembly diameter	85	mm
Screwfitting	DIN 7984 / Ø 4.50	mm
Terminal	+: 6.3 x 0.8 / -: 4.8 x 0.8	mm
Shipping weight (pair))	3.4	Kg
Shipping box size (pair)	200/200/250	mm

Thiele Small Parameters

Specification		Value	Unit
Sensitivity (2.83V / 1m)	Spl	87.5	dB
DC-resistance	Re	8.1	Ohm
Resonance frequency	Fs	37	Hz
Equivalent volume of air	Vas	27.3	ltr
Mechanical Q	Qms	4.91
Electrical Q	Qes	0.39
Total Q	Qts	0.36
Effective piston area	Sd	113	Cm2
Moving mass	Mms	12.1	g
Suspension compliance	CMs	1.5	mm/n
Mechanical resistance	Rms	0.58	Kg*s

voice coil parameters

Specification		Value	Unit
Power handling	P	100	W
Linear excursion	Xmax	+/-5	mm
Voice coil diameter		25	mm
Voice coil former material		Ti
Voice coil material		Cu
Voice coil inductance	Le	0.54	mH
Force factor	Bl	7.7	N/A
Motor type		Overhung
Ferrofluid filling		No

Frequency Response [db]

Impedance [OHM]