Vifa MG18WK09-04, 6 1/2″ Midwoofer 150W 4Ω (Pair)

Nominal Specifications

    * Nominal Diameter 6“, 160 mm
    * Overall Diameter 7.34/6.37“, 186.5/162 mm
    * Bolt Circle Diameter 6.77“, 172 mm
    * Baffle Cutout Diameter 5.78“, 147 mm
    * Depth 3.43“, 87.2 mm
    * Flange and Gasket Thickness 0.29“, 7.5 mm


Electrical Specifications

    * Minimum Impedance 6.6 Ohm
    * Nominal Impedance 8 Ohm
    * Nominal Power Handling*** 150 W
    * Maximum Power Handling**** 300 W
    * Sensitivity (1W/1m) 97 dB
    * Frequency Range 100 - 5000 Hz
    * Voice Coil Diameter 5“, 52 mm
    * Winding Material Aluminium
    * Former Material Glass Fiber
    * Winding Depth 0.26“, 6.66 mm
    * Magnetic Gap Depth 0.24“, 6 mm
    * Flux Density 1.35 T


THIELE & SMALL Parameters

    * Resonant Frequency (fs) 100 Hz
    * DC Resistance (Re) 5.5 Ohm
    * BL Product (BL) 11.6 N/A
    * Diaphragm Mass inc. Airload (Mms) 13.5 grams
    * Mechanical Compliance of Suspension (Cms) 0.19 mm/N
    * Rms 0.96 Kg/s
    * Electromagnetic Q (Qes) 0.35
    * Mechanical Q (Qms) 8.80
    * Total Q (Qts) 0.33
    * Compliance Equivalent Volume (Vas) 0.20 ft³, 5.80 dm³
    * Surface Area of Cone (Sd) 5.82“², 147.8 cm²
    * Maximum Linear Excursion (Xmax)* 2.3 mm
    * Xdamage** 11.6 mm
    * Coil Inductance (Le) 0.28 mH
    * Diaphragm mass (Mmd) 12.7 g
    * Eta Zero 1.63 %

Notes

    * *Xmax = [(winding depth - magnetic gap depth) / 2] + (magnetic gap depth / 3)
    * **Maximum excursion before permanent damage
    * ***2 Hours Test According to AES 2-1984 Rev. 2003
    * ****Maximum power is defined as 3dB greater than nominal power

• 130 W + 25 W Power handling
• 1.5" + 1" voice coil
• Single point source providing coherent wave front
• 900 conical dispersion
• Optimal for compact 2-way systems

Woofer 6" 300w program/94dB/W/m-70-
5000Hz.

300 W continuous program power capacity
38 mm (1.5 in) aluminium voice coil
70 - 5000 Hz response
94 dB sensitivity

Specification
Nominal Diameter 170 (6.5) mm (in)
Nominal Impedance (1) 8 Ohm
Minimum Impedence 6.6 Ohm
Nominal Power Handling (2) 150 W
Continuous Power Handling (3) 300 W
Sensitivity (1W/1m) (4) 94 dB
Frequency Range 70 - 5000 Hz
Voice Coil Diameter 38 (1.5) mm (in)
Winding Material Copper
Former Material Glass Fibre
Winding Depth 12.5 (1/2) mm (in)
Magnetic Gap Depth 6 (0.25) mm (in)
Flux Density 1.4 T

Thiele & Small Parameters
Fs 75 Hz
Re 5.4 Ohm
Qes 0.31
Qms 11.7
Qts 0.3
Vas 8 (0.28) dm3 (ft3)
Sd 132 (20.5) cm2 (in2)
Eta Zero 1 %
Xmax +/- 6 mm
Xvar +/- 7.5 mm
Mms 14 g
Bl 10.8 Txm
Le 0.6 mH

Mounting and Shipping Info
Overall Diameter 187 mm (7.4 in)
Bolt Circle Diameter 172 mm (6.7 in)
Baffle Cutout Diameter 145 mm (5.7 in)
Depth 82 mm (3.2 in)
Flange and Gasket Thickness 9 mm (0.35 in)
Net Weight 2.2 kg (4.8 lb)
Shipping Weight (4 units) 10.1 kg (22.2 lb)
Shipping Box (4 units) 405x225x210 mm
(15.9x8.8x8.3 in)
1For different impedances, please ask.
22 hours test made with continuous pink noise signal (6 dB crest factor).
Power calculated on rated minimum impedance.
3Power on Continuous Program is defined as 3 dB greater than the
Nominal rating.
4Applied RMS Voltage is set to 2.83V for 8 ohms Nominal Impedance.

Nominal Diameter     160 mm (6 in)
Overall Diameter     167.4 mm (6.59 in)
Bolt Circle Diameter     154 mm (6.06 in)
Baffle Cutout Diameter     144 mm (5.67 in)
Depth     77 mm (3 in)
Flange and Gasket Thickness     8 mm (0.31 in)
Net Weight     2 Kg (4.41 lb)
Shipping Box
(Single Carton Box)     103x190x185 mm (4.06x7.48x7.28 in)
Shipping Weight     2.6 Kg (5.73 lb)
       

Nominal Impedance     8 Ohm
Minimum Impedance     6.8 Ohm
Nominal Power Handling ***     130 W
Maximum Power Handling ****     260 W
Sensitivity (1W/1m)     95 dB
Frequency Range     85÷6000 Hz
Voice Coil Diameter     37 mm (1.46 in)
Winding Material     Al
Former Material     Kapton
Winding Depth     12 mm (0.47 in)
Magnetic Gap Depth     8 mm (0.31 in)
Flux Density     1 T

Fs     120 Hz
Re     5.9 Ohm
Qes     0.5
Qms     7.3
Qts     0.47
Vas     3.56 dm^3 (0.13 ft^3)
Sd     118 cm^2 (18.29 in^2)
Xmax *     4.67 mm
Xdamage **     10.4 mm
Mms     11 g
Bl     8.2 N/A
Le     0.4 mH
Mmd     9.5 g
Cms     0.18 mm/N
Rms     1 Kg/s
Eta Zero     1 %
EBP     240 Hz