Eighteen Sound design
High performance dual 21" subwoofer
- Drivers
- 2 × 21NTLW5000, 8 Ω
21-inch LF driver · 1,800 W
Eighteen Sound 21NTLW5000 8Ω
30–1800 Hz
£595.00
SteadyLean Business · All 5 offers
- Fs
- 31Hz
- Xmax
- 17.5mm
- SPL
- 95dB
- Pe
- 1800W
- BL
- 32T·m
- Vd
- 2909cm³
- Qts
- 0.36
- Vas
- 270L
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
240 plotted pointsMedium confidence6,876 selected pixels of 10,690 - Trace datasheet-response-trace-poc/v1
impedance
Impedance response
230 plotted pointsMedium confidence1,210 selected pixels of 1,464
Published graphs
Eighteen Sound 21NTLW5000 is a 21-inch 8 ohm LF driver rated at 1800 W RMS. The validated T/S data includes Fs 31 Hz, Qts 0.36, Vas 270 L, Xmax 17.5 mm, sensitivity 95.3 dB, plus 2909 cm³ Vd and 82 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 £595.00.
The published T/S values agree with each other
Thiele/Small
- Fs
- 31Hz
- Qts
- 0.36
- Qes
- 0.38
- Qms
- 5.2
- Vas
- 270L
- Re
- 5.3Ω
- Le
- 1.60mH
Motor and cone
- BL
- 32T·m
- Sd
- 1662cm²
- Mms
- 372g
- Xmax
- 17.5mm
- Vd †
- 2909cm³
Power and response
- Sensitivity †
- 95.3dB
- Manufacturer sensitivity
- 97dB
- Power
- 1800W
- Nominal power
- 1800W
- Impedance
- 8Ω
- Range
- 30–1800Hz
- EBP †
- 82 · Sealed or vented
Size and mounting
- Diameter
- 545mm
- Cutout
- 492mm
- Bolt circle
- 520mm
- Depth
- 320mm
- Weight
- 12.5kg
Other published values
- Power Program
- 4000
Sensitivity shows 95.3 dB, calculated from the T/S values. Eighteen Sound publishes 97.0 dB, 1.7 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else Eighteen Sound lists
LF · Primary · 21″
- BL
- 32T·m
- Fs
- 31Hz
- Le
- 1.60mH
- Re
- 5.3Ω
- Sd
- 1662cm²
- Mms
- 372g
- Qes
- 0.38
- Qms
- 5.2
- Qts
- 0.36
- SPL
- 95.3dB
- Vas
- 270L
- Xmax
- 17.5mm
- Power
- 1800W
- Impedance
- 8Ω
- Sensitivity
- 97dB
- Low limit
- 30Hz
- Nominal power
- 1800W
- Power Program
- 4000
- Calculated sensitivity †
- 95.3dB
- High limit
- 1800Hz
- Manufacturer sensitivity
- 97dB
- Weight
- 12.5kg
- Diameter
- 545mm
- Depth
- 320mm
- Cutout
- 492mm
- Bolt circle
- 520mm
02
Designs
Cabinets for the 21NTLW5000: a design and a suggested box from Eighteen Sound, and plans builders have published.
All 21NTLW5000 designsHow we find designsEighteen Sound’s design
From the maker, with plans to download
Eighteen Sound’s suggested box
From Eighteen Sound’s 21NTLW5000 page
- Net volume
- 200L
- 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…
Plans from builders
Links to published plans that name this driver
In the plan’s list of drivers
03
Compare
Same-size drivers, compared with the 21NTLW5000. Clear differences are green when better and red when worse.
This driver21NTLW5000
Best price
£595.00
Fs
31 Hz
Qts
0.36
Vas
270 L
BL
32 T·m
Xmax
17.5 mm
Sensitivity
95.3 dB
Power
1800 W
Dayton AudioPSS555-8
£194.48 · 67% less, betterFs28 Hz −11%, better
Qts0.33 −8%
Vas444 L +64%, worse
BL29.7 T·m −7%
Xmax11 mm −37%, worse
Sensitivity96.4 dB +1.1
SB AudienceNERO-21SW1100D
£343.60 · 42% less, betterFs32 Hz +3%
Qts0.34 −6%
Vas312.6 L +16%, worse
BL30 T·m −6%
Xmax12.2 mm −30%, worse
Sensitivity96.7 dB +1.4
Eighteen Sound21LW2600
£425.60 · 28% less, betterFs27 Hz −13%, better
Qts0.33 −8%
Vas333 L +23%, worse
BL32.5 T·m –
Xmax14.6 mm −17%, worse
Sensitivity94.9 dB –
CelestionTSQ2145
£445.00 · 25% less, betterFs30 Hz −3%
Qts0.34 −4%
Vas253.8 L −6%
BL33.8 T·m +6%
Xmax15 mm −14%, worse
Sensitivity94.8 dB −0.5
RCFLF21X451
£448.61 · 25% less, betterFs28 Hz −10%
Qts0.37 –
Vas385 L +43%, worse
BL30.5 T·m −5%
Xmax14 mm −20%, worse
Sensitivity95.4 dB –
Dayton AudioHTS545HE-4
£448.82 · 25% less, betterFs26 Hz −15%, better
Qts0.28 −22%, better
Vas179 L −34%, better
BL38.2 T·m +19%, better
Xmax21 mm +20%, better
Sensitivity92.5 dB −2.8, worse
Eighteen Sound21NLW4100
£456.79 · 23% less, betterFs36 Hz +16%, worse
Qts0.46 +28%, worse
Vas210 L −22%, better
BL29.4 T·m −8%
Xmax15.2 mm −13%, worse
Sensitivity95 dB –
B&C21SW115
£458.85 · 23% less, betterFs30 Hz −3%
Qts0.37 –
Vas318 L +18%, worse
BL30.1 T·m −6%
Xmax14 mm −20%, worse
Sensitivity95.5 dB –
Beyma21LEX1600ND
£475.00 · 20% less, betterFs30 Hz −3%
Qts0.29 −19%, better
Vas305 L +13%, worse
BL36.6 T·m +14%, better
Xmax14 mm −20%, worse
Sensitivity96.4 dB +1.1
RCFLF21N451
£475.00 · 20% less, betterFs30 Hz −3%
Qts0.26 −28%, better
Vas375 L +39%, worse
BL34.5 T·m +8%
Xmax13 mm −26%, worse
Sensitivity97.8 dB +2.5, better
B&C21DS115
£475.59 · 20% less, betterFs34 Hz +10%
Qts0.27 −25%, better
Vas204 L −24%, better
BL39.3 T·m +23%, better
Xmax16.5 mm −6%
Sensitivity96.6 dB +1.3
Beyma21QLEX1600FE
£493.97 · 17% less, betterFs30 Hz −3%
Qts0.28 −22%, better
Vas309 L +14%, worse
BL36.4 T·m +14%, better
Xmax13 mm −26%, worse
Sensitivity96.5 dB +1.2
B&C21SW152
£537.55 · 10% less, betterFs32 Hz +3%
Qts0.36 –
Vas200 L −26%, better
BL39 T·m +22%, better
Xmax15 mm −14%, worse
Sensitivity94.4 dB −0.9
Eighteen Sound21NLW9001
£549.89 · 8% less, betterFs32 Hz +3%
Qts0.31 −14%, better
Vas244 L −10%
BL37 T·m +16%, better
Xmax14 mm −20%, worse
Sensitivity95.7 dB –
No photo
Precision DevicesPD.2155-1N
£555.00 · 7% less, betterFs33 Hz +6%
Qts0.36 –
Vas241 L −11%, better
BL30 T·m −6%
Xmax14 mm −20%, worse
Sensitivity95.7 dB –
Eighteen Sound21NLW4000
£608.33 · 2% moreFs29 Hz −6%
Qts0.37 –
Vas305 L +13%, worse
BL30 T·m −6%
Xmax15 mm −14%, worse
Sensitivity94.9 dB –
No photo
Precision DevicesPD.2160-1N
£799.00 · 34% more, worseFs35 Hz +13%, worse
Qts0.30 −17%, better
Vas177 L −34%, better
BL43 T·m +34%, better
Xmax16 mm −9%
Sensitivity95.9 dB +0.6
FaitalPRO21XL3000
£899.00 · 51% more, worseFs30 Hz −3%
Qts0.25 −31%, better
Vas284.6 L +5%
BL43 T·m +34%, better
Xmax17.7 mm –
Sensitivity96.9 dB +1.6
EminenceNSW6021-124
£916.36 · 54% more, worseFs31 Hz –
Qts0.32 −11%, better
Vas224.6 L −17%, better
BL30.5 T·m −5%
Xmax21 mm +20%, better
Sensitivity95 dB –
No current price
Fs33 Hz +6%
Qts0.36 –
Vas241 L −11%, better
BL30 T·m −6%
Xmax14 mm −20%, worse
Sensitivity95.7 dB –
No current price
Fs35 Hz +13%, worse
Qts0.34 −6%
Vas266 L –
BL31.3 T·m –
Xmax14 mm −20%, worse
Sensitivity97.1 dB +1.8
No photo
Precision DevicesPD.2155-1F
No current priceFs35 Hz +13%, worse
Qts0.34 −6%
Vas266 L –
BL31.3 T·m –
Xmax14 mm −20%, worse
Sensitivity97.1 dB +1.8
Eighteen Sound21LW2500
No current priceFs29 Hz −6%
Qts0.37 –
Vas305 L +13%, worse
BL30 T·m −6%
Xmax14 mm −20%, worse
Sensitivity94.9 dB –
Eighteen Sound21NLW5300
No current priceFs31 Hz –
Qts0.32 −11%, better
Vas325 L +20%, worse
BL31 T·m −3%
Xmax15.3 mm −13%, worse
Sensitivity96.6 dB +1.3
CelestionNTR21-5010JD
No current priceFs32 Hz +4%
Qts0.32 −11%, better
Vas276.7 L –
BL33.9 T·m +6%
Xmax9 mm −49%, worse
Sensitivity96.4 dB +1.1
P.AudioSD21-125XB
No current priceFs35 Hz +13%, worse
Qts0.38 +6%
Vas345.6 L +28%, worse
BL30.4 T·m −5%
Xmax11.3 mm −36%, worse
Sensitivity97.7 dB +2.4, better
B&C21SW150
No current priceFs29 Hz −6%
Qts0.26 −28%, better
Vas254 L −6%
BL32.6 T·m –
Xmax15 mm −14%, worse
Sensitivity95.6 dB –
Sica21 S 4 PL
No current priceFs35 Hz +12%, worse
Qts0.30 −17%, better
Vas255 L −6%
BL36.1 T·m +13%, better
Xmax5.2 mm −70%, worse
Sensitivity97.4 dB +2.1, better
Eighteen Sound21NLW9601C
No current priceFs38 Hz +23%, worse
Qts0.29 −19%, better
Vas140 L −48%, better
BL33.2 T·m +4%
Xmax14 mm −20%, worse
Sensitivity96 dB +0.7
Dayton AudioPSS545HE-4
No current priceFs29 Hz −7%
Qts0.27 −25%, better
Vas212.2 L −21%, better
BL35.5 T·m +11%, better
Xmax21 mm +20%, better
Sensitivity94.6 dB −0.7
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 Business | £595.00, the lowest price | Stock not listed | Visit shop at Lean Business | |
Lean Audio | £595.00 | Back order | Visit shop at Lean Audio |
Best price over time
Tracked since 1 Apr