Eighteen Sound design
1x21” band-pass subwoofer
- Drivers
- 21LW1400or 21NLW4100or 21LW2600
21-inch LF driver · 1,500 W
Eighteen Sound 21NLW4100 4Ω
32–300 Hz
No price for delivery to the UK
- Fs
- 34Hz
- Xmax
- 15.2mm
- SPL
- 95dB
- Pe
- 1500W
- BL
- 22.8T·m
- Vd
- 2525cm³
- Qts
- 0.40
- Vas
- 219L
Published graphs
Eighteen Sound 21NLW4100 is a 21-inch 4 ohm LF driver rated at 1500 W RMS. The validated T/S data includes Fs 34 Hz, Qts 0.40, Vas 219 L, Xmax 15.2 mm, sensitivity 95.1 dB, plus 2525 cm³ Vd and 81 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 £505.48.
The published T/S values agree with each other
Thiele/Small
- Fs
- 34Hz
- Qts
- 0.40
- Qes
- 0.42
- Qms
- 7.8
- Vas
- 219L
- Re
- 2.6Ω
- Le
- 1.50mH
Motor and cone
- BL
- 22.8T·m
- Sd
- 1661cm²
- Mms
- 400g
- Xmax
- 15.2mm
- Vd †
- 2525cm³
Power and response
- Sensitivity †
- 95.1dB
- Manufacturer sensitivity
- 97dB
- Power
- 1500W
- Nominal power
- 1500W
- Impedance
- 4Ω
- Range
- 32–300Hz
- EBP †
- 81 · Sealed or vented
Size and mounting
- Diameter
- 545mm
- Cutout
- 492mm
- Bolt circle
- 520mm
- Depth
- 245mm
- Weight
- 10.5kg
Other published values
- Power Program
- 3000
Sensitivity shows 95.1 dB, calculated from the T/S values. Eighteen Sound publishes 97.0 dB, 1.9 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else Eighteen Sound lists
LF · Primary · 21″
- BL
- 22.8T·m
- Fs
- 34Hz
- Le
- 1.50mH
- Re
- 2.6Ω
- Sd
- 1661cm²
- Mms
- 400g
- Qes
- 0.42
- Qms
- 7.8
- Qts
- 0.40
- SPL
- 95.1dB
- Vas
- 219L
- Xmax
- 15.2mm
- Power
- 1500W
- Impedance
- 4Ω
- Sensitivity
- 97dB
- Low limit
- 32Hz
- Nominal power
- 1500W
- Power Program
- 3000
- Calculated sensitivity †
- 95.1dB
- High limit
- 300Hz
- Manufacturer sensitivity
- 97dB
- Weight
- 10.5kg
- Diameter
- 545mm
- Depth
- 245mm
- Cutout
- 492mm
- Bolt circle
- 520mm
02
Designs
Cabinets for the 21NLW4100: a design and a suggested box from Eighteen Sound.
All 21NLW4100 designsHow we find designsEighteen Sound’s design
From the maker, with plans to download
Eighteen Sound’s suggested box
From Eighteen Sound’s 21NLW4100 page
- Net volume
- 250L
- Tuning
- 33Hz
Eighteen Sound gives the volume and tuning; the port is sized for the driver when you open it.
Modelling the box in 00 Simulator…
03
Compare
Same-size drivers, compared with the 21NLW4100. Clear differences are green when better and red when worse.
This driver21NLW4100
Best price
£505.48
Fs
34 Hz
Qts
0.40
Vas
219 L
BL
22.8 T·m
Xmax
15.2 mm
Sensitivity
95.1 dB
Power
1500 W
SB AudienceNERO-21SW1100D
£343.60 · 32% less, betterFs32 Hz −6%
Qts0.34 −15%, better
Vas312.6 L +43%, worse
BL30 T·m +32%, better
Xmax12.2 mm −20%, worse
Sensitivity96.7 dB +1.6
SB AudienceROSSO-21SW800
£417.84 · 17% less, betterFs38 Hz +12%, worse
Qts0.76 +90%, worse
Vas224.4 L –
BL24.1 T·m +6%
Xmax11.4 mm −25%, worse
Sensitivity93.9 dB −1.2
Beyma21QLEX1600FE
£425.00 · 16% less, betterFs30 Hz −12%, better
Qts0.28 −30%, better
Vas309 L +41%, worse
BL36.4 T·m +60%, better
Xmax13 mm −14%, worse
Sensitivity96.5 dB +1.4
CelestionTSQ2145
£445.00 · 12% less, betterFs30 Hz −12%, better
Qts0.34 −14%, better
Vas253.8 L +16%, worse
BL33.8 T·m +48%, better
Xmax15 mm –
Sensitivity94.8 dB –
RCFLF21X451
£448.61 · 11% less, betterFs28 Hz −18%, better
Qts0.37 −8%
Vas385 L +76%, worse
BL30.5 T·m +34%, better
Xmax14 mm −8%
Sensitivity95.4 dB –
Beyma21LEX1600ND
£475.00 · 6% less, betterFs30 Hz −12%, better
Qts0.29 −28%, better
Vas305 L +39%, worse
BL36.6 T·m +61%, better
Xmax14 mm −8%
Sensitivity96.4 dB +1.3
B&C21SW115
£475.55 · 6% less, betterFs33 Hz –
Qts0.36 −10%, better
Vas278 L +27%, worse
BL24.8 T·m +9%
Xmax14 mm −8%
Sensitivity96.3 dB +1.2
B&C21DS115
£483.91 · 4% lessFs32 Hz −6%
Qts0.21 −48%, better
Vas219 L –
BL28.6 T·m +25%, better
Xmax15 mm –
Sensitivity97.2 dB +2.1, better
No photo
Precision DevicesPD.2155-1N
£555.00 · 10% more, worseFs33 Hz –
Qts0.36 −10%, better
Vas241 L +10%, worse
BL30 T·m +32%, better
Xmax14 mm −8%
Sensitivity95.7 dB +0.6
B&C21SW152
£585.00 · 16% more, worseFs32 Hz −6%
Qts0.30 −25%, better
Vas200 L −9%
BL32.5 T·m +43%, better
Xmax15 mm –
Sensitivity95.3 dB –
Eighteen Sound21NLW9001
£586.79 · 16% more, worseFs31 Hz −9%
Qts0.34 −15%, better
Vas272 L +24%, worse
BL23.8 T·m +4%
Xmax14 mm −8%
Sensitivity95.4 dB –
Eighteen Sound21NLW9601
£592.80 · 17% more, worseFs41 Hz +21%, worse
Qts0.32 −20%, better
Vas123 L −44%, better
BL32.7 T·m +43%, better
Xmax14 mm −8%
Sensitivity96.1 dB +1
Eighteen Sound21NTLW5000
£595.00 · 18% more, worseFs30 Hz −12%, better
Qts0.32 −20%, better
Vas300 L +37%, worse
BL25 T·m +10%
Xmax17.5 mm +15%, better
Sensitivity95.9 dB +0.8
Eighteen Sound21NLW4000
£607.21 · 20% more, worseFs27 Hz −21%, better
Qts0.38 −5%
Vas380 L +74%, worse
BL20 T·m −12%, worse
Xmax15 mm –
Sensitivity94.9 dB –
No photo
Precision DevicesPD.2160-1N
£799.00 · 58% more, worseFs35 Hz –
Qts0.30 −25%, better
Vas177 L −19%, better
BL43 T·m +89%, better
Xmax16 mm +5%
Sensitivity95.9 dB +0.8
FaitalPRO21XL3000
£799.00 · 58% more, worseFs32 Hz −6%
Qts0.22 −45%, better
Vas223.5 L –
BL35.5 T·m +56%, better
Xmax17.7 mm +16%, better
Sensitivity97.3 dB +2.2, better
EminenceNSW6021-124
£912.88 · 81% more, worseFs31 Hz −10%
Qts0.32 −20%, better
Vas224.6 L –
BL30.5 T·m +34%, better
Xmax21 mm +38%, better
Sensitivity95 dB –
No current price
Fs33 Hz –
Qts0.36 −10%, better
Vas241 L +10%, worse
BL30 T·m +32%, better
Xmax14 mm −8%
Sensitivity95.7 dB +0.6
Eighteen Sound21LW2500
No current priceFs29 Hz −15%, better
Qts0.37 −8%
Vas305 L +39%, worse
BL30 T·m +32%, better
Xmax14 mm −8%
Sensitivity94.9 dB –
No current price
Fs35 Hz –
Qts0.34 −15%, better
Vas266 L +21%, worse
BL31.3 T·m +37%, better
Xmax14 mm −8%
Sensitivity97.1 dB +2, better
No photo
Precision DevicesPD.2155-1F
No current priceFs35 Hz –
Qts0.34 −15%, better
Vas266 L +21%, worse
BL31.3 T·m +37%, better
Xmax14 mm −8%
Sensitivity97.1 dB +2, better
Eighteen Sound21LW2600
No current priceFs27 Hz −21%, better
Qts0.29 −28%, better
Vas332 L +52%, worse
BL24.9 T·m +9%
Xmax14.6 mm −4%
Sensitivity95.6 dB +0.5
P.AudioSD21-125XB
No current priceFs35 Hz –
Qts0.38 −5%
Vas345.6 L +58%, worse
BL30.4 T·m +33%, better
Xmax11.3 mm −26%, worse
Sensitivity97.7 dB +2.6, better
Eighteen Sound21NLW5300
No current priceFs31 Hz −9%
Qts0.32 −20%, better
Vas325 L +48%, worse
BL31 T·m +36%, better
Xmax15.3 mm –
Sensitivity96.6 dB +1.5
Eighteen Sound21ID
No current priceFs38 Hz +12%, worse
Qts0.23 −43%, better
Vas143 L −35%, better
BL25.2 T·m +11%, better
Xmax14 mm −8%
Sensitivity97.2 dB +2.1, better
B&C21SW150
No current priceFs29 Hz −15%, better
Qts0.26 −35%, better
Vas254 L +16%, worse
BL32.6 T·m +43%, better
Xmax15 mm –
Sensitivity95.6 dB +0.5
Eighteen Sound21NLW9601C
No current priceFs38 Hz +12%, worse
Qts0.29 −28%, better
Vas140 L −36%, better
BL33.2 T·m +46%, better
Xmax14 mm −8%
Sensitivity96 dB +0.9
CelestionNTR21-5010JD
No current priceFs32 Hz −5%
Qts0.32 −20%, better
Vas276.7 L +26%, worse
BL33.9 T·m +48%, better
Xmax9 mm −41%, worse
Sensitivity96.4 dB +1.3
Dayton AudioPSS545HE-4
No current priceFs29 Hz −15%, better
Qts0.27 −33%, better
Vas212.2 L −3%
BL35.5 T·m +56%, better
Xmax21 mm +38%, better
Sensitivity94.6 dB −0.5
Sica21 S 4 PL
No current priceFs35 Hz –
Qts0.30 −25%, better
Vas255 L +16%, worse
BL36.1 T·m +58%, better
Xmax5.2 mm −66%, worse
Sensitivity97.4 dB +2.3, better
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
None of the shops we track lists delivery to the UK at checkout.