18-inch LF driver · 102 mm voice coil · 1,200 W

BMS 18N850V2 8Ω

Name: BMS 18N850V2 8 Ohm
Brand: BMS
SKU: 18N850V2
Availability: InStock

8 Ω · 20–200 Hz

£457.13

Steady

Lean Audio · 1 in stock · All 2 offers

Open in 00 Simulator

Fs: 30Hz
Xmax: 12mm
SPL: 95dB
Pe: 1200W
BL: 25.4T·m
Vd: 1456cm³
Qts: 0.33
Vas: 243L

See all 25 specs

Specifications

Published by BMS

Manufacturer page

BMS 18N850V2 is an 18-inch 8 ohm LF driver rated at 1200 W RMS. The validated T/S data includes Fs 30 Hz, Qts 0.33, Vas 243 L, Xmax 12 mm, sensitivity 94.7 dB, plus 1456 cm³ Vd and 85 EBP. bits tracks UK, EU and US shop prices, price movement, datasheet links, simulator import data, and similar drivers, with a current best price of £457.13.

The published T/S values agree with each other

Thiele/Small

Fs: 30Hz
Qts: 0.33
Qes: 0.35
Qms: 7
Vas: 243L
Re: 5Ω
Le: 0.85mH

Motor and cone

BL: 25.4T·m
Sd: 1213cm²
Mms: 240g
Xmax: 12mm
Vd †: 1456cm³
Voice coil: 102mm

Power and response

Sensitivity †: 94.7dB
Manufacturer sensitivity: 95dB
Power: 1200W
Impedance: 8Ω
Range: 20–200Hz
EBP †: 85 · Sealed or vented

Size and mounting

Diameter: 458mm
Cutout: 414mm
Bolt circle: 440mm
Depth: 237mm
Weight: 9.8kg

Other published values

Cms: 0.12mm/N

† Calculated by bits from the published values

What this validation status means

Everything else BMS lists

LF

BL: 25.4T·m
Fs: 30Hz
Le: 0.85mH
Re: 5Ω
Sd: 1213cm²
Cms: 0.12mm/N
Mms: 240g
Qes: 0.35
Qms: 7
Qts: 0.33
SPL: 94.7dB
Vas: 243L
Xmax: 12mm
Power: 1200W
Impedance: 8Ω
Sensitivity: 95dB
Low limit: 20Hz
Calculated sensitivity †: 94.7dB
High limit: 200Hz
Manufacturer sensitivity: 95dB
Voice coil: 102mm
10. basket: Cast Aluminum
20. bl factor: BL 25.4 Tesla m
1. application: Infra-Subwoofer
18. moving mass: Mms 0.240 kg
13. dc resistance: Re 5 Ohm
9. magnet gap depth: 12 mm
17. equivalent volume: Vas 243 L
2. nominal impendance: 8 Ohm
5. frequency response: 20 – 200 Hz
6. voice coil diameter: 101.6 (4″) mm
7. voice coil material: Cu
12. resonance frequency: Fs 29.8 Hz
14. mechanical q factor: Qms 7
15. electrical q factor: Qes 0.35
16. total quality factor: Qts 0.33
19. mechanical complience: Cms 0.120 mm / N
21. effective piston area: Sd 0.1213 m²
22. max. linear excursion: Xmax +/- 12 mm
23. voice coil inductance: Le1k 0.85 mH
4. sensitivity (1 w / 1 m): 95 dB
3. power handling aes noise: 1200 W
8. voice coil winding depth: 36 mm
11. effect. diaphragm diameter d: 393 mm

Compare

Same-size drivers, compared with the 18N850V2. Clear differences are green when better and red when worse.

This driver18N850V2

Best price

£457.13

30 Hz

Qts

0.33

Vas

243 L

25.4 T·m

Xmax

12 mm

Sensitivity

94.7 dB

Power

1200 W

B&C18TBX100

£184.81 · 60% less

Fs34 Hz +14%

Qts0.35 +6%

Vas212 L −13%

BL25.5 T·m –

Xmax9 mm −25%

Sensitivity95.6 dB +0.9

Beyma18LEX1000FE

£225.00 · 51% less

Fs34 Hz +14%

Qts0.38 +15%

Vas250 L –

BL23.8 T·m −6%

Xmax11 mm −8%

Sensitivity96 dB +1.3

RCFL18P300

£225.00 · 51% less

Fs33 Hz +11%

Qts0.33 –

Vas226 L −7%

BL23.5 T·m −7%

Xmax8 mm −33%

Sensitivity95.8 dB +1.1

B&C18RBX100

£226.58 · 50% less

Fs40 Hz +34%

Qts0.34 +3%

Vas220 L −9%

BL25.1 T·m –

Xmax10 mm −17%

Sensitivity98 dB +3.3

B&C18TBW100

£227.94 · 50% less

Fs33 Hz +11%

Qts0.32 −3%

Vas181.5 L −25%

BL22.8 T·m −10%

Xmax12 mm –

Sensitivity94.9 dB –

PRV Audio18SW3600

£239.31 · 48% less

Fs33 Hz +9%

Qts0.36 +9%

Vas279.7 L +15%

BL25.5 T·m –

Xmax13.3 mm +10%

Sensitivity96.1 dB +1.4

FaitalPRO18HP1060

£245.81 · 46% less

Fs35 Hz +17%

Qts0.37 +12%

Vas200.3 L −18%

BL24.8 T·m –

Xmax12.4 mm +4%

Sensitivity95.6 dB +0.9

Beyma18P1000FEV2S

£249.00 · 46% less

Fs33 Hz +11%

Qts0.32 −3%

Vas230 L −5%

BL26.8 T·m +6%

Xmax8 mm −33%

Sensitivity96 dB +1.3

Eighteen Sound18LW2400

£272.63 · 40% less

Fs35 Hz +17%

Qts0.31 −6%

Vas230 L −5%

BL25.6 T·m –

Xmax9.5 mm −21%

Sensitivity96.9 dB +2.2

Eighteen Sound18LW2420

£279.00 · 39% less

Fs32 Hz +7%

Qts0.33 –

Vas252 L +4%

BL25.3 T·m –

Xmax10 mm −17%

Sensitivity95.8 dB +1.1

Beyma18LEX1200ND

£279.79 · 39% less

Fs36 Hz +21%

Qts0.33 –

Vas219 L −10%

BL26.4 T·m +4%

Xmax11 mm −8%

Sensitivity96.7 dB +2

Oberton18XB1301DS

£284.15 · 38% less

Fs36 Hz +20%

Qts0.30 −8%

Vas172.9 L −29%

BL26.9 T·m +6%

Xmax12 mm –

Sensitivity96 dB +1.3

RCFLF18X401

£289.00 · 37% less

Fs30 Hz –

Qts0.30 −9%

Vas274 L +13%

BL26.5 T·m +4%

Xmax12 mm –

Sensitivity95.8 dB +1.1

CIARENDH18-4S

£291.62 · 36% less

Fs31 Hz +4%

Qts0.32 −3%

Vas239 L –

BL27.7 T·m +9%

Xmax11.5 mm −4%

Sensitivity95.4 dB +0.7

Dayton Audio18SW1200N-8

£301.39 · 34% less

Fs32 Hz +7%

Qts0.33 –

Vas253.6 L +4%

BL27.6 T·m +9%

Xmax9.1 mm −24%

Sensitivity95.8 dB +1.1

RCFLF18N405

£325.54 · 29% less

Fs30 Hz –

Qts0.32 −3%

Vas227 L −7%

BL26.5 T·m +4%

Xmax14 mm +17%

Sensitivity94.6 dB –

SB AudienceNERO-18SW1100D

£334.88 · 27% less

Fs36 Hz +21%

Qts0.33 –

Vas153.1 L −37%

BL30.9 T·m +22%

Xmax12.2 mm –

Sensitivity95.3 dB +0.6

BMS18S450

£345.00 · 25% less

Fs29 Hz –

Qts0.31 −6%

Vas281 L +16%

BL26.5 T·m +4%

Xmax12 mm –

Sensitivity95.3 dB +0.6

Precision DevicesPD.1852/2

£397.00 · 13% less

Fs42 Hz +40%

Qts0.33 –

Vas120.4 L −50%

BL30.5 T·m +20%

Xmax12 mm –

Sensitivity96.2 dB +1.5

FaitalPRO18XL1600

£399.95 · 13% less

Fs32 Hz +7%

Qts0.36 +9%

Vas211.4 L −13%

BL26.7 T·m +5%

Xmax12.9 mm +8%

Sensitivity94.8 dB –

Dayton AudioRSS460HO-4

£442.94 · 3% less

Fs19 Hz −37%

Qts0.32 −3%

Vas272 L +12%

BL23.4 T·m −8%

Xmax12.8 mm +6%

Sensitivity89.2 dB −5.5

B&C18HTX100

£809.86 · 77% more

Fs44 Hz +48%

Qts0.32 −3%

Vas173 L −29%

BL26.3 T·m +4%

Xmax13 mm +8%

Sensitivity98.4 dB +3.7

No photo

RCFLF18Y402

No current price

Fs30 Hz –

Qts0.30 −9%

Vas274 L +13%

BL26.5 T·m +4%

Xmax12 mm –

Sensitivity95.8 dB +1.1

Sica18 S 4 CP

No current price

Fs33 Hz +11%

Qts0.35 +6%

Vas225 L −7%

BL23.5 T·m −7%

Xmax11 mm −8%

Sensitivity95.2 dB +0.5

FaneCOLOSSUS 18XB

No current price

Fs33 Hz +11%

Qts0.34 –

Vas236 L –

BL25.9 T·m –

Xmax7.5 mm −38%

Sensitivity95.8 dB +1.1

RCFLF18N408

No current price

Fs30 Hz –

Qts0.33 –

Vas193 L −21%

BL25.7 T·m –

Xmax15 mm +25%

Sensitivity93.6 dB −1.1

Oberton18XB1201

No current price

Fs38 Hz +28%

Qts0.32 −4%

Vas159.4 L −34%

BL26.7 T·m +5%

Xmax10.5 mm −13%

Sensitivity96.3 dB +1.6

FaneCOLOSSUS PRIME 18XS

No current price

Fs33 Hz +11%

Qts0.39 +17%

Vas257 L +6%

BL22.4 T·m −12%

Xmax12 mm –

Sensitivity95.6 dB +0.9

Precision DevicesPD.184C002

No current price

Fs40 Hz +34%

Qts0.34 +3%

Vas268 L +10%

BL21 T·m −17%

Xmax9.7 mm −19%

Sensitivity98.8 dB +4.1

No photo

FaneIMPERIUM 18NDXL

No current price

Fs33 Hz +11%

Qts0.29 −11%

Vas203 L −16%

BL29.4 T·m +16%

Xmax12 mm –

Sensitivity95.9 dB +1.2

Search similar

Tune the match

Choose the published values that matter to your design. Size stays matched to this driver.

Qts

Qes

Vas

Xmax

Where to buy

Prices for delivery to the UK, including VAT. How prices work

Watch price

Shop	Price	Against the lowest	Stock	Link
Lean Audio Checked 26 Oct 2026 · 8 Ω · Source: inc VAT · 20%	£457.13, the lowest price		1 in stock	Visit shop at Lean Audio

Best price over time

Tracked since 1 Apr

bits00 AUDIO

18-inch LF driver · 102 mm voice coil · 1,200 W

BMS 18N850V2 8Ω

8 Ω · 20–200 Hz

£457.13

Steady

Lean Audio · 1 in stock · All 2 offers

Open in 00 Simulator

Fs: 30Hz
Xmax: 12mm
SPL: 95dB
Pe: 1200W
BL: 25.4T·m
Vd: 1456cm³
Qts: 0.33
Vas: 243L

See all 25 specs

Specifications

Published by BMS

Manufacturer page

The published T/S values agree with each other

Thiele/Small

Fs: 30Hz
Qts: 0.33
Qes: 0.35
Qms: 7
Vas: 243L
Re: 5Ω
Le: 0.85mH

Motor and cone

BL: 25.4T·m
Sd: 1213cm²
Mms: 240g
Xmax: 12mm
Vd †: 1456cm³
Voice coil: 102mm

Power and response

Sensitivity †: 94.7dB
Manufacturer sensitivity: 95dB
Power: 1200W
Impedance: 8Ω
Range: 20–200Hz
EBP †: 85 · Sealed or vented

Size and mounting

Diameter: 458mm
Cutout: 414mm
Bolt circle: 440mm
Depth: 237mm
Weight: 9.8kg

Other published values

Cms: 0.12mm/N

† Calculated by bits from the published values

What this validation status means

Everything else BMS lists

LF

BL: 25.4T·m
Fs: 30Hz
Le: 0.85mH
Re: 5Ω
Sd: 1213cm²
Cms: 0.12mm/N
Mms: 240g
Qes: 0.35
Qms: 7
Qts: 0.33
SPL: 94.7dB
Vas: 243L
Xmax: 12mm
Power: 1200W
Impedance: 8Ω
Sensitivity: 95dB
Low limit: 20Hz
Calculated sensitivity †: 94.7dB
High limit: 200Hz
Manufacturer sensitivity: 95dB
Voice coil: 102mm
10. basket: Cast Aluminum
20. bl factor: BL 25.4 Tesla m
1. application: Infra-Subwoofer
18. moving mass: Mms 0.240 kg
13. dc resistance: Re 5 Ohm
9. magnet gap depth: 12 mm
17. equivalent volume: Vas 243 L
2. nominal impendance: 8 Ohm
5. frequency response: 20 – 200 Hz
6. voice coil diameter: 101.6 (4″) mm
7. voice coil material: Cu
12. resonance frequency: Fs 29.8 Hz
14. mechanical q factor: Qms 7
15. electrical q factor: Qes 0.35
16. total quality factor: Qts 0.33
19. mechanical complience: Cms 0.120 mm / N
21. effective piston area: Sd 0.1213 m²
22. max. linear excursion: Xmax +/- 12 mm
23. voice coil inductance: Le1k 0.85 mH
4. sensitivity (1 w / 1 m): 95 dB
3. power handling aes noise: 1200 W
8. voice coil winding depth: 36 mm
11. effect. diaphragm diameter d: 393 mm

Compare

Same-size drivers, compared with the 18N850V2. Clear differences are green when better and red when worse.

This driver18N850V2

Best price

£457.13

30 Hz

Qts

0.33

Vas

243 L

25.4 T·m

Xmax

12 mm

Sensitivity

94.7 dB

Power

1200 W

B&C18TBX100

£184.81 · 60% less

Fs34 Hz +14%

Qts0.35 +6%

Vas212 L −13%

BL25.5 T·m –

Xmax9 mm −25%

Sensitivity95.6 dB +0.9

Beyma18LEX1000FE

£225.00 · 51% less

Fs34 Hz +14%

Qts0.38 +15%

Vas250 L –

BL23.8 T·m −6%

Xmax11 mm −8%

Sensitivity96 dB +1.3

RCFL18P300

£225.00 · 51% less

Fs33 Hz +11%

Qts0.33 –

Vas226 L −7%

BL23.5 T·m −7%

Xmax8 mm −33%

Sensitivity95.8 dB +1.1

B&C18RBX100

£226.58 · 50% less

Fs40 Hz +34%

Qts0.34 +3%

Vas220 L −9%

BL25.1 T·m –

Xmax10 mm −17%

Sensitivity98 dB +3.3

B&C18TBW100

£227.94 · 50% less

Fs33 Hz +11%

Qts0.32 −3%

Vas181.5 L −25%

BL22.8 T·m −10%

Xmax12 mm –

Sensitivity94.9 dB –

PRV Audio18SW3600

£239.31 · 48% less

Fs33 Hz +9%

Qts0.36 +9%

Vas279.7 L +15%

BL25.5 T·m –

Xmax13.3 mm +10%

Sensitivity96.1 dB +1.4

FaitalPRO18HP1060

£245.81 · 46% less

Fs35 Hz +17%

Qts0.37 +12%

Vas200.3 L −18%

BL24.8 T·m –

Xmax12.4 mm +4%

Sensitivity95.6 dB +0.9

Beyma18P1000FEV2S

£249.00 · 46% less

Fs33 Hz +11%

Qts0.32 −3%

Vas230 L −5%

BL26.8 T·m +6%

Xmax8 mm −33%

Sensitivity96 dB +1.3

Eighteen Sound18LW2400

£272.63 · 40% less

Fs35 Hz +17%

Qts0.31 −6%

Vas230 L −5%

BL25.6 T·m –

Xmax9.5 mm −21%

Sensitivity96.9 dB +2.2

Eighteen Sound18LW2420

£279.00 · 39% less

Fs32 Hz +7%

Qts0.33 –

Vas252 L +4%

BL25.3 T·m –

Xmax10 mm −17%

Sensitivity95.8 dB +1.1

Beyma18LEX1200ND

£279.79 · 39% less

Fs36 Hz +21%

Qts0.33 –

Vas219 L −10%

BL26.4 T·m +4%

Xmax11 mm −8%

Sensitivity96.7 dB +2

Oberton18XB1301DS

£284.15 · 38% less

Fs36 Hz +20%

Qts0.30 −8%

Vas172.9 L −29%

BL26.9 T·m +6%

Xmax12 mm –

Sensitivity96 dB +1.3

RCFLF18X401

£289.00 · 37% less

Fs30 Hz –

Qts0.30 −9%

Vas274 L +13%

BL26.5 T·m +4%

Xmax12 mm –

Sensitivity95.8 dB +1.1

CIARENDH18-4S

£291.62 · 36% less

Fs31 Hz +4%

Qts0.32 −3%

Vas239 L –

BL27.7 T·m +9%

Xmax11.5 mm −4%

Sensitivity95.4 dB +0.7

Dayton Audio18SW1200N-8

£301.39 · 34% less

Fs32 Hz +7%

Qts0.33 –

Vas253.6 L +4%

BL27.6 T·m +9%

Xmax9.1 mm −24%

Sensitivity95.8 dB +1.1

RCFLF18N405

£325.54 · 29% less

Fs30 Hz –

Qts0.32 −3%

Vas227 L −7%

BL26.5 T·m +4%

Xmax14 mm +17%

Sensitivity94.6 dB –

SB AudienceNERO-18SW1100D

£334.88 · 27% less

Fs36 Hz +21%

Qts0.33 –

Vas153.1 L −37%

BL30.9 T·m +22%

Xmax12.2 mm –

Sensitivity95.3 dB +0.6

BMS18S450

£345.00 · 25% less

Fs29 Hz –

Qts0.31 −6%

Vas281 L +16%

BL26.5 T·m +4%

Xmax12 mm –

Sensitivity95.3 dB +0.6

Precision DevicesPD.1852/2

£397.00 · 13% less

Fs42 Hz +40%

Qts0.33 –

Vas120.4 L −50%

BL30.5 T·m +20%

Xmax12 mm –

Sensitivity96.2 dB +1.5

FaitalPRO18XL1600

£399.95 · 13% less

Fs32 Hz +7%

Qts0.36 +9%

Vas211.4 L −13%

BL26.7 T·m +5%

Xmax12.9 mm +8%

Sensitivity94.8 dB –

Dayton AudioRSS460HO-4

£442.94 · 3% less

Fs19 Hz −37%

Qts0.32 −3%

Vas272 L +12%

BL23.4 T·m −8%

Xmax12.8 mm +6%

Sensitivity89.2 dB −5.5

B&C18HTX100

£809.86 · 77% more

Fs44 Hz +48%

Qts0.32 −3%

Vas173 L −29%

BL26.3 T·m +4%

Xmax13 mm +8%

Sensitivity98.4 dB +3.7

No photo

RCFLF18Y402

No current price

Fs30 Hz –

Qts0.30 −9%

Vas274 L +13%

BL26.5 T·m +4%

Xmax12 mm –

Sensitivity95.8 dB +1.1

Sica18 S 4 CP

No current price

Fs33 Hz +11%

Qts0.35 +6%

Vas225 L −7%

BL23.5 T·m −7%

Xmax11 mm −8%

Sensitivity95.2 dB +0.5

FaneCOLOSSUS 18XB

No current price

Fs33 Hz +11%

Qts0.34 –

Vas236 L –

BL25.9 T·m –

Xmax7.5 mm −38%

Sensitivity95.8 dB +1.1

RCFLF18N408

No current price

Fs30 Hz –

Qts0.33 –

Vas193 L −21%

BL25.7 T·m –

Xmax15 mm +25%

Sensitivity93.6 dB −1.1

Oberton18XB1201

No current price

Fs38 Hz +28%

Qts0.32 −4%

Vas159.4 L −34%

BL26.7 T·m +5%

Xmax10.5 mm −13%

Sensitivity96.3 dB +1.6

FaneCOLOSSUS PRIME 18XS

No current price

Fs33 Hz +11%

Qts0.39 +17%

Vas257 L +6%

BL22.4 T·m −12%

Xmax12 mm –

Sensitivity95.6 dB +0.9

Precision DevicesPD.184C002

No current price

Fs40 Hz +34%

Qts0.34 +3%

Vas268 L +10%

BL21 T·m −17%

Xmax9.7 mm −19%

Sensitivity98.8 dB +4.1

No photo

FaneIMPERIUM 18NDXL

No current price

Fs33 Hz +11%

Qts0.29 −11%

Vas203 L −16%

BL29.4 T·m +16%

Xmax12 mm –

Sensitivity95.9 dB +1.2

Search similar

Tune the match

Choose the published values that matter to your design. Size stays matched to this driver.

Qts

Qes

Vas

Xmax

Where to buy

Prices for delivery to the UK, including VAT. How prices work

Watch price

Shop	Price	Against the lowest	Stock	Link
Lean Audio Checked 26 Oct 2026 · 8 Ω · Source: inc VAT · 20%	£457.13, the lowest price		1 in stock	Visit shop at Lean Audio

Best price over time

Tracked since 1 Apr