Eighteen Sound design
1x21” band-pass subwoofer
- Drivers
- 21LW1400or 21NLW4100or 21LW2600
21-inch LF driver · 1,500 W
Eighteen Sound 21NLW4100 8Ω
32–300 Hz
£456.79
SteadyLean Audio · 2 in stock · All 2 offers
- Fs
- 36Hz
- Xmax
- 15.2mm
- SPL
- 95dB
- Pe
- 1500W
- BL
- 29.4T·m
- Vd
- 2525cm³
- Qts
- 0.46
- Vas
- 210L
Manufacturer response and impedance data, with source and trace details below. The left and right arrow keys read every shown curve at a frequency, a twelfth of an octave at a time, or an octave with Shift. Escape clears the reading.
Curve provenanceInspect 2 traces
These plotted lines are Bits digitizations of manufacturer evidence, not new measurements. How provenance works
- Trace datasheet-response-trace-poc/v1
frequency response
Frequency response
132 plotted pointsMedium confidence372 selected pixels of 543 - Trace datasheet-response-trace-poc/v1
impedance
Impedance response
240 plotted pointsMedium confidence745 selected pixels of 991
Published graphs
Eighteen Sound 21NLW4100 is a 21-inch 8 ohm LF driver rated at 1500 W RMS. The validated T/S data includes Fs 36 Hz, Qts 0.46, Vas 210 L, Xmax 15.2 mm, sensitivity 95 dB, plus 2525 cm³ Vd and 73 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 £456.79.
The published T/S values agree with each other
Thiele/Small
- Fs
- 36Hz
- Qts
- 0.46
- Qes
- 0.49
- Qms
- 7.8
- Vas
- 210L
- Re
- 5.1Ω
- Le
- 2.10mH
Motor and cone
- BL
- 29.4T·m
- Sd
- 1661cm²
- Mms
- 374g
- Xmax
- 15.2mm
- Vd †
- 2525cm³
Power and response
- Sensitivity †
- 95dB
- Manufacturer sensitivity
- 97dB
- Power
- 1500W
- Nominal power
- 1500W
- Impedance
- 8Ω
- Range
- 32–300Hz
- EBP †
- 73 · 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 95.0 dB, calculated from the T/S values. Eighteen Sound publishes 97.0 dB, 2.0 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else Eighteen Sound lists
LF · Primary · 21″
- BL
- 29.4T·m
- Fs
- 36Hz
- Le
- 2.10mH
- Re
- 5.1Ω
- Sd
- 1661cm²
- Mms
- 374g
- Qes
- 0.49
- Qms
- 7.8
- Qts
- 0.46
- SPL
- 95dB
- Vas
- 210L
- Xmax
- 15.2mm
- Power
- 1500W
- Impedance
- 8Ω
- Sensitivity
- 97dB
- Low limit
- 32Hz
- Nominal power
- 1500W
- Power Program
- 3000
- Calculated sensitivity †
- 95dB
- 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
£456.79
Fs
36 Hz
Qts
0.46
Vas
210 L
BL
29.4 T·m
Xmax
15.2 mm
Sensitivity
95 dB
Power
1500 W
Dayton AudioPSS555-8
£194.48 · 57% less, betterFs28 Hz −23%, better
Qts0.33 −28%, better
Vas444 L +111%, worse
BL29.7 T·m –
Xmax11 mm −28%, worse
Sensitivity96.4 dB +1.4
SB AudienceNERO-21SW1100D
£343.60 · 25% less, betterFs32 Hz −11%, better
Qts0.34 −26%, better
Vas312.6 L +49%, worse
BL30 T·m –
Xmax12.2 mm −20%, worse
Sensitivity96.7 dB +1.7
SB AudienceROSSO-21SW800
£418.61 · 8% less, betterFs38 Hz +6%
Qts0.76 +65%, worse
Vas224.4 L +7%
BL24.1 T·m −18%, worse
Xmax11.4 mm −25%, worse
Sensitivity93.9 dB −1.1
Eighteen Sound21LW2600
£425.60 · 7% less, betterFs27 Hz −25%, better
Qts0.33 −28%, better
Vas333 L +59%, worse
BL32.5 T·m +11%, better
Xmax14.6 mm −4%
Sensitivity94.9 dB –
CelestionTSQ2145
£445.00 · 3% lessFs30 Hz −17%, better
Qts0.34 −25%, better
Vas253.8 L +21%, worse
BL33.8 T·m +15%, better
Xmax15 mm –
Sensitivity94.8 dB –
RCFLF21X451
£448.61 · 2% lessFs28 Hz −22%, better
Qts0.37 −20%, better
Vas385 L +83%, worse
BL30.5 T·m +4%
Xmax14 mm −8%
Sensitivity95.4 dB –
B&C21SW115
£458.85 · Same priceFs30 Hz −17%, better
Qts0.37 −20%, better
Vas318 L +51%, worse
BL30.1 T·m –
Xmax14 mm −8%
Sensitivity95.5 dB +0.5
Beyma21LEX1600ND
£475.00 · 4% moreFs30 Hz −17%, better
Qts0.29 −37%, better
Vas305 L +45%, worse
BL36.6 T·m +24%, better
Xmax14 mm −8%
Sensitivity96.4 dB +1.4
B&C21DS115
£475.59 · 4% moreFs34 Hz −6%
Qts0.27 −41%, better
Vas204 L –
BL39.3 T·m +34%, better
Xmax16.5 mm +9%
Sensitivity96.6 dB +1.6
Beyma21QLEX1600FE
£493.97 · 8% more, worseFs30 Hz −17%, better
Qts0.28 −39%, better
Vas309 L +47%, worse
BL36.4 T·m +24%, better
Xmax13 mm −14%, worse
Sensitivity96.5 dB +1.5
B&C21SW152
£537.55 · 18% more, worseFs32 Hz −11%, better
Qts0.36 −22%, better
Vas200 L −5%
BL39 T·m +33%, better
Xmax15 mm –
Sensitivity94.4 dB −0.6
Eighteen Sound21NLW9001
£549.89 · 20% more, worseFs32 Hz −11%, better
Qts0.31 −33%, better
Vas244 L +16%, worse
BL37 T·m +26%, better
Xmax14 mm −8%
Sensitivity95.7 dB +0.7
No photo
Precision DevicesPD.2155-1N
£555.00 · 22% more, worseFs33 Hz −8%
Qts0.36 −22%, better
Vas241 L +15%, worse
BL30 T·m –
Xmax14 mm −8%
Sensitivity95.7 dB +0.7
Eighteen Sound21NTLW5000
£595.00 · 30% more, worseFs31 Hz −14%, better
Qts0.36 −22%, better
Vas270 L +29%, worse
BL32 T·m +9%
Xmax17.5 mm +15%, better
Sensitivity95.3 dB –
Eighteen Sound21NLW4000
£608.33 · 33% more, worseFs29 Hz −19%, better
Qts0.37 −20%, better
Vas305 L +45%, worse
BL30 T·m –
Xmax15 mm –
Sensitivity94.9 dB –
Eighteen Sound21NLW9601
£623.80 · 37% more, worseFs37 Hz –
Qts0.29 −37%, better
Vas175 L −17%, better
BL43 T·m +46%, better
Xmax14 mm −8%
Sensitivity96.6 dB +1.6
No photo
Precision DevicesPD.2160-1N
£799.00 · 75% more, worseFs35 Hz –
Qts0.30 −35%, better
Vas177 L −16%, better
BL43 T·m +46%, better
Xmax16 mm +5%
Sensitivity95.9 dB +0.9
EminenceNSW6021-124
£916.36 · 101% more, worseFs31 Hz −15%, better
Qts0.32 −30%, better
Vas224.6 L +7%
BL30.5 T·m +4%
Xmax21 mm +38%, better
Sensitivity95 dB –
No current price
Fs33 Hz −8%
Qts0.36 −22%, better
Vas241 L +15%, worse
BL30 T·m –
Xmax14 mm −8%
Sensitivity95.7 dB +0.7
Eighteen Sound21LW2500
No current priceFs29 Hz −19%, better
Qts0.37 −20%, better
Vas305 L +45%, worse
BL30 T·m –
Xmax14 mm −8%
Sensitivity94.9 dB –
No current price
Fs35 Hz –
Qts0.34 −26%, better
Vas266 L +27%, worse
BL31.3 T·m +6%
Xmax14 mm −8%
Sensitivity97.1 dB +2.1, better
No photo
Precision DevicesPD.2155-1F
No current priceFs35 Hz –
Qts0.34 −26%, better
Vas266 L +27%, worse
BL31.3 T·m +6%
Xmax14 mm −8%
Sensitivity97.1 dB +2.1, better
B&C21SW150
No current priceFs29 Hz −19%, better
Qts0.26 −43%, better
Vas254 L +21%, worse
BL32.6 T·m +11%, better
Xmax15 mm –
Sensitivity95.6 dB +0.6
Eighteen Sound21NLW5300
No current priceFs31 Hz −14%, better
Qts0.32 −30%, better
Vas325 L +55%, worse
BL31 T·m +5%
Xmax15.3 mm –
Sensitivity96.6 dB +1.6
Eighteen Sound21NLW9601C
No current priceFs38 Hz +6%
Qts0.29 −37%, better
Vas140 L −33%, better
BL33.2 T·m +13%, better
Xmax14 mm −8%
Sensitivity96 dB +1
P.AudioSD21-125XB
No current priceFs35 Hz –
Qts0.38 −17%, better
Vas345.6 L +65%, worse
BL30.4 T·m +3%
Xmax11.3 mm −26%, worse
Sensitivity97.7 dB +2.7, better
Eighteen Sound21ID
No current priceFs38 Hz +6%
Qts0.23 −50%, better
Vas143 L −32%, better
BL25.2 T·m −14%, worse
Xmax14 mm −8%
Sensitivity97.2 dB +2.2, better
Dayton AudioPSS545HE-4
No current priceFs29 Hz −20%, better
Qts0.27 −41%, better
Vas212.2 L –
BL35.5 T·m +21%, better
Xmax21 mm +38%, better
Sensitivity94.6 dB –
CelestionNTR21-5010JD
No current priceFs32 Hz −11%, better
Qts0.32 −30%, better
Vas276.7 L +32%, worse
BL33.9 T·m +15%, better
Xmax9 mm −41%, worse
Sensitivity96.4 dB +1.4
Sica21 S 4 PL
No current priceFs35 Hz −4%
Qts0.30 −35%, better
Vas255 L +21%, worse
BL36.1 T·m +23%, better
Xmax5.2 mm −66%, worse
Sensitivity97.4 dB +2.4, better
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
| Shop | Price | Against the lowest | Stock | Link |
|---|---|---|---|---|
Lean Audio | £456.79, the lowest price | 2 in stock | Visit shop at Lean Audio |
Best price over time
Tracked since 1 Apr