- Net volume
- 200L
- Tuning
- 31Hz
Eighteen Sound gives the volume and tuning; the port is sized for the driver when you open it.
21-inch LF driver · 1,600 W
Eighteen Sound 21NLW4000 8Ω
30–1800 Hz
No price for delivery to the UK
- Fs
- 29Hz
- Xmax
- 15mm
- SPL
- 95dB
- Pe
- 1600W
- BL
- 30T·m
- Vd
- 2490cm³
- Qts
- 0.37
- Vas
- 305L
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/v2
frequency response
Frequency response
142 plotted pointsSource file SHA-256 5474ee34f804…Medium confidence653 selected pixels of 1,499 - Trace datasheet-response-trace-poc/v2
impedance
Impedance response
240 plotted pointsSource file SHA-256 5474ee34f804…Medium confidence976 selected pixels of 1,341
Published graphs
Eighteen Sound 21NLW4000 is a 21-inch 8 ohm LF driver rated at 1600 W RMS. The validated T/S data includes Fs 29 Hz, Qts 0.37, Vas 305 L, Xmax 15 mm, sensitivity 94.9 dB, plus 2490 cm³ Vd and 76 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 £613.78.
The published T/S values agree with each other
Thiele/Small
- Fs
- 29Hz
- Qts
- 0.37
- Qes
- 0.38
- Qms
- 22
- Vas
- 305L
- Re
- 4.9Ω
- Le
- 2.80mH
Motor and cone
- BL
- 30T·m
- Sd
- 1660cm²
- Mms
- 380g
- Xmax
- 15mm
- Vd †
- 2490cm³
Power and response
- Sensitivity †
- 94.9dB
- Manufacturer sensitivity
- 97dB
- Power
- 1600W
- Nominal power
- 1600W
- Impedance
- 8Ω
- Range
- 30–1800Hz
- EBP †
- 76 · Sealed or vented
Size and mounting
- Diameter
- 545mm
- Cutout
- 492mm
- Bolt circle
- 520mm
- Depth
- 245mm
- Weight
- 11.6kg
Other published values
- Power Program
- 3200
Sensitivity shows 94.9 dB, calculated from the T/S values. Eighteen Sound publishes 97.0 dB, 2.1 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else Eighteen Sound lists
LF · Primary · 21″
- BL
- 30T·m
- Fs
- 29Hz
- Le
- 2.80mH
- Re
- 4.9Ω
- Sd
- 1660cm²
- Mms
- 380g
- Qes
- 0.38
- Qms
- 22
- Qts
- 0.37
- SPL
- 94.9dB
- Vas
- 305L
- Xmax
- 15mm
- Power
- 1600W
- Impedance
- 8Ω
- Sensitivity
- 97dB
- Low limit
- 30Hz
- Nominal power
- 1600W
- Power Program
- 3200
- Calculated sensitivity †
- 94.9dB
- High limit
- 1800Hz
- Manufacturer sensitivity
- 97dB
- Weight
- 11.6kg
- Diameter
- 545mm
- Depth
- 245mm
- Cutout
- 492mm
- Bolt circle
- 520mm
02
Designs
What Eighteen Sound suggests for the 21NLW4000. No published designs name it yet.
How we find designsEighteen Sound’s suggested box
From Eighteen Sound’s 21NLW4000 page
Open this box in 00 Simulator
Modelling the box in 00 Simulator…
03
Compare
Same-size drivers, compared with the 21NLW4000. Clear differences are green when better and red when worse.
This driver21NLW4000
Best price
£613.78
Fs
29 Hz
Qts
0.37
Vas
305 L
BL
30 T·m
Xmax
15 mm
Sensitivity
94.9 dB
Power
1600 W
Dayton AudioPSS555-8
£196.43 · 68% less, betterFs28 Hz −5%
Qts0.33 −11%, better
Vas444 L +46%, worse
BL29.7 T·m –
Xmax11 mm −27%, worse
Sensitivity96.4 dB +1.5
SB AudienceNERO-21SW1100D
£343.60 · 44% less, betterFs32 Hz +10%, worse
Qts0.34 −8%
Vas312.6 L –
BL30 T·m –
Xmax12.2 mm −19%, worse
Sensitivity96.7 dB +1.8
Beyma21QLEX1600FE
£425.00 · 31% less, betterFs30 Hz +3%
Qts0.28 −24%, better
Vas309 L –
BL36.4 T·m +21%, better
Xmax13 mm −13%, worse
Sensitivity96.5 dB +1.6
Eighteen Sound21LW2600
£429.42 · 30% less, betterFs27 Hz −7%
Qts0.33 −11%, better
Vas333 L +9%
BL32.5 T·m +8%
Xmax14.6 mm –
Sensitivity94.9 dB –
CelestionTSQ2145
£445.00 · 27% less, betterFs30 Hz +3%
Qts0.34 −7%
Vas253.8 L −17%, better
BL33.8 T·m +13%, better
Xmax15 mm –
Sensitivity94.8 dB –
RCFLF21X451
£448.61 · 27% less, betterFs28 Hz −3%
Qts0.37 –
Vas385 L +26%, worse
BL30.5 T·m –
Xmax14 mm −7%
Sensitivity95.4 dB +0.5
Eighteen Sound21NLW4100
£456.79 · 26% less, betterFs36 Hz +24%, worse
Qts0.46 +24%, worse
Vas210 L −31%, better
BL29.4 T·m –
Xmax15.2 mm –
Sensitivity95 dB –
B&C21SW115
£462.96 · 25% less, betterFs30 Hz +3%
Qts0.37 –
Vas318 L +4%
BL30.1 T·m –
Xmax14 mm −7%
Sensitivity95.5 dB +0.6
Beyma21LEX1600ND
£475.00 · 23% less, betterFs30 Hz +3%
Qts0.29 −22%, better
Vas305 L –
BL36.6 T·m +22%, better
Xmax14 mm −7%
Sensitivity96.4 dB +1.5
RCFLF21N451
£475.00 · 23% less, betterFs30 Hz +3%
Qts0.26 −30%, better
Vas375 L +23%, worse
BL34.5 T·m +15%, better
Xmax13 mm −13%, worse
Sensitivity97.8 dB +2.9, better
LavoceSAN214.50
£480.70 · 22% less, betterFs33 Hz +14%, worse
Qts0.28 −24%, better
Vas218.3 L −28%, better
BL39.6 T·m +32%, better
Xmax15.4 mm –
Sensitivity96.4 dB +1.5
B&C21SW152
£542.37 · 12% less, betterFs32 Hz +10%, worse
Qts0.36 –
Vas200 L −34%, better
BL39 T·m +30%, better
Xmax15 mm –
Sensitivity94.4 dB −0.5
Eighteen Sound21NLW9001
£554.81 · 10% less, betterFs32 Hz +10%, worse
Qts0.31 −16%, better
Vas244 L −20%, better
BL37 T·m +23%, better
Xmax14 mm −7%
Sensitivity95.7 dB +0.8
Eighteen Sound21NTLW5000
£595.00 · 3% lessFs31 Hz +7%
Qts0.36 –
Vas270 L −11%, better
BL32 T·m +7%
Xmax17.5 mm +17%, better
Sensitivity95.3 dB –
EminenceNSW6021-6
£800.00 · 30% more, worseFs29 Hz –
Qts0.31 −16%, better
Vas224.6 L −26%, better
BL33.8 T·m +13%, better
Xmax21 mm +40%, better
Sensitivity94.5 dB –
No photo
Precision DevicesPD.2160-1N
£811.00 · 32% more, worseFs35 Hz +21%, worse
Qts0.30 −19%, better
Vas177 L −42%, better
BL43 T·m +43%, better
Xmax16 mm +7%
Sensitivity95.9 dB +1
EminenceNSW6021-124
£925.57 · 51% more, worseFs31 Hz +6%
Qts0.32 −14%, better
Vas224.6 L −26%, better
BL30.5 T·m –
Xmax21 mm +40%, better
Sensitivity95 dB –
Eighteen Sound21LW2500
No current priceFs29 Hz –
Qts0.37 –
Vas305 L –
BL30 T·m –
Xmax14 mm −7%
Sensitivity94.9 dB –
No current price
Fs33 Hz +14%, worse
Qts0.36 –
Vas241 L −21%, better
BL30 T·m –
Xmax14 mm −7%
Sensitivity95.7 dB +0.8
No photo
Precision DevicesPD.2155-1N
No current priceFs33 Hz +14%, worse
Qts0.36 –
Vas241 L −21%, better
BL30 T·m –
Xmax14 mm −7%
Sensitivity95.7 dB +0.8
No current price
Fs35 Hz +21%, worse
Qts0.34 −8%
Vas266 L −13%, better
BL31.3 T·m +4%
Xmax14 mm −7%
Sensitivity97.1 dB +2.2, better
No photo
Precision DevicesPD.2155-1F
No current priceFs35 Hz +21%, worse
Qts0.34 −8%
Vas266 L −13%, better
BL31.3 T·m +4%
Xmax14 mm −7%
Sensitivity97.1 dB +2.2, better
Eighteen Sound21NLW5300
No current priceFs31 Hz +7%
Qts0.32 −14%, better
Vas325 L +7%
BL31 T·m +3%
Xmax15.3 mm –
Sensitivity96.6 dB +1.7
P.AudioSD21-125XB
No current priceFs35 Hz +21%, worse
Qts0.38 –
Vas345.6 L +13%, worse
BL30.4 T·m –
Xmax11.3 mm −25%, worse
Sensitivity97.7 dB +2.8, better
BishopSoundBWN21/4
No current priceFs29 Hz –
Qts0.42 +13%, worse
Vas244.2 L −20%, better
BL32.6 T·m +9%
Xmax15 mm –
Sensitivity93.2 dB −1.7
BishopSoundBWN21/8
No current priceFs29 Hz –
Qts0.42 +13%, worse
Vas244.2 L −20%, better
BL32.6 T·m +9%
Xmax15 mm –
Sensitivity93.2 dB −1.7
B&C21SW150
No current priceFs29 Hz –
Qts0.26 −30%, better
Vas254 L −17%, better
BL32.6 T·m +9%
Xmax15 mm –
Sensitivity95.6 dB +0.7
CelestionNTR21-5010JD
No current priceFs32 Hz +11%, worse
Qts0.32 −14%, better
Vas276.7 L −9%
BL33.9 T·m +13%, better
Xmax9 mm −40%, worse
Sensitivity96.4 dB +1.5
Eighteen Sound21NLW9601C
No current priceFs38 Hz +31%, worse
Qts0.29 −22%, better
Vas140 L −54%, better
BL33.2 T·m +11%, better
Xmax14 mm −7%
Sensitivity96 dB +1.1
Sica21 S 4 PL
No current priceFs35 Hz +19%, worse
Qts0.30 −19%, better
Vas255 L −16%, better
BL36.1 T·m +20%, better
Xmax5.2 mm −65%, worse
Sensitivity97.4 dB +2.5, 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 | £380.00 | Out of stock | Visit shop at Lean Audio | |
Lean Business | £380.00 | Out of stock | Visit shop at Lean Business |