BMS BMS12S302L 12 S 302 L – 12″ Bass Midrange Speaker 500 W 8 Ohm

• 96 dB sensitivity 1 W / 1 m
• 500 W Power handling
• 3" voice coil
• Double treated cone for water protection
• Triple aluminum demodulating rings for ultra low distortion
• Optimal for compact 2- or 3-way systems
• Light weight carbon fibre diaphragm

• Nominal Basket Diameter 12“, 304.8 mm
• Nominal Impedance 8 ohms
• Power Rating Watts 400 W / Music Program 800 W
• Resonance 55 Hz
• Usable Frequency Range 54 Hz - 5 kHz
• Sensitivity 98.3
• Magnet Weight 56 oz.
• Gap Height 0.375“, 9.53 mm
• Voice Coil Diameter 2.5“, 63.5 mm

• Resonant Frequency (fs) 55 Hz
• DC Resistance (Re) 6.3
• Coil Inductance (Le) 0.74 mH
• Mechanical Q (Qms) 5.27
• Electromagnetic Q (Qes) 0.46
• Total Q (Qts) 0.43
• Compliance Equivalent Volume 81.3 liters (Vas) 81.3 liters / 2.9 cu. ft.
• Peak Diaphragm Displacement Volume 125 cc
• Mechanical Compliance of Suspension 0.21 mm/N
• BL Product (BL) 13.5 T-M
• Diaphragm Mass inc. Airload (Mms) 39 grams
• Efficiency Bandwidth Product (EBP) 120
• Maximum Linear Excursion (Xmax) 2.4 mm
• Surface Area of Cone (Sd) 519.5 cm²
• Maximum Mechanical Limit (Xlim) 9.9 mm

• Recommended Enclosure Volume Sealed N/A Vented 25.5-85 liters/0.9-3 cu.ft.
• Overall Diameter 12.03“, 305.5 mm
• Baffle Hole Diameter 10.95“, 278.1 mm
• Front Sealing Gasket fitted as standard
• Rear Sealing Gasket fitted as standard
• Mounting Holes Diameter 0.25“, 6.4 mm
• Mounting Holes B.C.D. 11.59“, 294.3 mm
• Depth 5.35“, 136 mm

• Aluminum voice coil
• Polyimide former
• Ferrite magnet
• Vented core
• Pressed steel basket
• Paper Cone
• Cloth cone edge
• Solid composition felt dust cap

• 98 dB sensitivity 1 W / 1 m
• 400 W + 60 W Power Handling
• 3" + 1.5" Copper Clad Sandwich Voice Coil
• Single Point Source providing coherent Wave Front
• Optical for compact 2-way Systems

Specification
Nominal Diameter 320 (12) mm (in)
Nominal Impedance (1) 8 Ohm
Minimum Impedence 7.5 Ohm
Nominal Power Handling (2) 450 W
Continuous Power Handling (3) 900 W
Sensitivity (1W/1m) (4) 95 dB
Frequency Range 40 - 1000 Hz
Voice Coil Diameter 76 (3) mm (in)
Winding Material Copper
Former Material Glass Fibre
Winding Depth 22 (0.9) mm (in)
Magnetic Gap Depth 10.5 (0.4) mm (in)
Flux Density 1.15 T

Thiele & Small Parameters
Fs 42 Hz
Re 6.1 Ohm
Qes 0.22
Qms 3.8
Qts 0.2
Vas 75 (2.6) dm3 (ft3)
Sd 522 (80.9) cm2 (in2)
Eta Zero 2.4 %
Xmax +/- 7 mm
Xvar +/- 9 mm
Mms 74 g
Bl 23.5 Txm
Le 2 mH

Mounting and Shipping Info
Overall Diameter 316 mm (12.4 in)
Bolt Circle Diameter 296 mm (11.6 in)
Baffle Cutout Diameter 282 mm (11.1 in)
Depth 140 mm (5.5 in)
Flange and Gasket Thickness 16 mm (5/8 in)
Net Weight 7.6 kg (16.7 lb)
Shipping Weight 8.4 kg (18.5 lb)
Shipping Box 340x340x170 mm
(13.4x13.4x6.7 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.

Long excursion 12" woofer with 800W power handling for
subwoofer application. A special 3" copper voice coil using
proprietary high temperature adhesives and an optimized
magnet assembly guarantees superb LF dynamic range with a
very low distortion. Due to the linear characteristics of the 12
PZ 32, exceptional results are obtained in horn loaded
subwoofer applications.

Specifications
Nominal Diameter 320 mm (12 in)
Nominal Impedance 8 Ω
Minumum Impedance 7.8 Ω
Power Handling
(70 –700 Hz)
Nominal1 400 W
Continuous Program2 800 W
Sensitivity (1W/1m)3 95 dB
Frequency Range 40-2500 Hz
Voice Coil Diameter 76 mm (3 in)
Winding Material Copper
Former Material Glass Fibre
Winding Depth 22 mm (7/8 in)
Magnetic Gap Depth 10 mm (3/8 in)
Flux Density 1.1 T
Also available in 4 Ω, data upon request

Thiele & Small Parameters4
Fs 38 Hz
Re 6.2 Ω
Qes 0.2
Qms 5.9
Qts 0.19
Vas 102 dm3 (3.6 ft3)
Sd 522 cm2 (80.9 in2)
η0 2.7%
X max ± 5.5 mm
X var ± 5.5 mm
Mms 64 g
Bl 21.7 T·m
Le 2.7 mH

Mounting and Shipping Information
Overall Diameter 316 mm (12.4 in)
Bolt Circle Diameter 296 mm (11.6 in)
Baffle Cutout Diameter 282 mm (11.1 in)
Depth 134 mm (5.3 in)
Flange and Gasket Thickness 16 mm (5/8 in)
Net Weight 7.6 kg (16.7 lb)
Shipping Weight 8.5 kg (18.7 lb)
Shipping Box 380x380x170 mm
(15x15x6.7 in)
1 2 hours test made with continuous pink noise signal (6 dB crest factor) within the
specified range. Power calculated on rated minimum impedance. Loudspeaker in
free air.
2 Power on Continuous Program is defined as 3 dB greater than the Nominal rating.
3 Applied RMS Voltage is set to 2.83V for 8 ohms Nominal Impedance. Average
SPL from 200 to 2500 Hz.
4 Thiele-Small parameters are measured after a high level 20 Hz sine wave preconditioning
test.