BMS 12S302 is a 12-inch 8 ohm LF driver rated at 500 W RMS. The validated T/S data includes Fs 45 Hz, Qts 0.25, Vas 65 L, Xmax 4.5 mm, sensitivity 95.5 dB, plus 239 cm³ Vd and 169 EBP. bits tracks vendor pricing, datasheet links, simulator import data, and similar drivers from the same loudspeaker database.
The published T/S values agree with each other
Thiele/Small
Fs 45Hz
Qts 0.25
Qes 0.27
Qms 5
Vas 65L
Re 3Ω
Le 0.50mH Motor and cone
BL 15.7T·m
Sd 531cm²
Mms 77g
Xmax 4.5mm
Vd † 239cm³
Voice coil 77mm Power and response
Sensitivity † 95.5dB
Manufacturer sensitivity 96dB
Power 500W
Impedance 8Ω
Range 45–2500Hz
EBP † 169 · Leans vented Size and mounting
Diameter 318mm
Cutout 284mm
Bolt circle 300mm
Depth 144mm
Weight 6.7kg Other published values
Cms 0.16mm/N † Calculated by bits from the published values
What this validation status means
Everything else BMS lists LF
BL 15.7T·m
Fs 45Hz
Le 0.50mH
Re 3Ω
Sd 531cm²
Cms 0.16mm/N
Mms 77g
Qes 0.27
Qms 5
Qts 0.25
SPL 95.5dB
Vas 65L
Xmax 4.5mm
Power 500W
Impedance 8Ω
Sensitivity 96dB
Low limit 45Hz
Calculated sensitivity † 95.5dB
High limit 2500Hz
Manufacturer sensitivity 96dB
Voice coil 77mm
10. basket Cast Aluminum
20. bl factor BL 15.65 Tesla m
1. application Compact 2- or 3-way
18. moving mass Mms 0.077 kg
13. dc resistance Re 3 Ohm
9. magnet gap depth 10 mm
17. equivalent volume Vas 65 L
2. nominal impendance 8 Ohm
5. frequency response 45 – 2500 Hz
6. voice coil diameter 77 (3″) mm
7. voice coil material Cu
12. resonance frequency Fs 45 Hz
14. mechanical q factor Qms 5
15. electrical q factor Qes 0.267
16. total quality factor Qts 0.253
19. mechanical complience Cms 0.16 mm / N
21. effective piston area Sd 0.0531 m²
22. max. linear excursion Xmax +/- 4.5 mm
23. voice coil inductance Le1k 0.5 mH
4. sensitivity (1 w / 1 m) 96 dB
3. power handling aes noise 500 W
8. voice coil winding depth 19 mm
11. effect. diaphragm diameter d 260 mm