Eighteen Sound design
High performance dual 21" subwoofer
- Drivers
- 2 × 21NTLW5000, 8 Ω
Designed with the 8 Ω version.
21-inch LF driver · 1,800 W
Eighteen Sound 21NTLW5000 4Ω
30–1800 Hz
£595.00
SteadyLean Audio · In stock · All 5 offers
- Fs
- 30Hz
- Xmax
- 17.5mm
- SPL
- 96dB
- Pe
- 1800W
- BL
- 25T·m
- Vd
- 2909cm³
- Qts
- 0.32
- Vas
- 300L
Published graphs
Eighteen Sound 21NTLW5000 is a 21-inch 4 ohm LF driver rated at 1800 W RMS. The validated T/S data includes Fs 30 Hz, Qts 0.32, Vas 300 L, Xmax 17.5 mm, sensitivity 95.9 dB, plus 2909 cm³ Vd and 91 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
- 30Hz
- Qts
- 0.32
- Qes
- 0.33
- Qms
- 12.3
- Vas
- 300L
- Re
- 3Ω
- Le
- 1.30mH
Motor and cone
- BL
- 25T·m
- Sd
- 1662cm²
- Mms
- 372g
- Xmax
- 17.5mm
- Vd †
- 2909cm³
Power and response
- Sensitivity †
- 95.9dB
- Manufacturer sensitivity
- 97dB
- Power
- 1800W
- Nominal power
- 1800W
- Impedance
- 4Ω
- Range
- 30–1800Hz
- EBP †
- 91 · 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 95.9 dB, calculated from the T/S values. Eighteen Sound publishes 97.0 dB, 1.1 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else Eighteen Sound lists
LF · Primary · 21″
- BL
- 25T·m
- Fs
- 30Hz
- Le
- 1.30mH
- Re
- 3Ω
- Sd
- 1662cm²
- Mms
- 372g
- Qes
- 0.33
- Qms
- 12.3
- Qts
- 0.32
- SPL
- 95.9dB
- Vas
- 300L
- Xmax
- 17.5mm
- Power
- 1800W
- Impedance
- 4Ω
- Sensitivity
- 97dB
- Low limit
- 30Hz
- Nominal power
- 1800W
- Power Program
- 4000
- Calculated sensitivity †
- 95.9dB
- 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
30 Hz
Qts
0.32
Vas
300 L
BL
25 T·m
Xmax
17.5 mm
Sensitivity
95.9 dB
Power
1800 W
Dayton AudioPSS555-8
£193.74 · 67% less, betterFs28 Hz −8%
Qts0.33 +3%
Vas444 L +48%, worse
BL29.7 T·m +19%, better
Xmax11 mm −37%, worse
Sensitivity96.4 dB +0.5
SB AudienceNERO-21SW1100D
£343.60 · 42% less, betterFs32 Hz +7%
Qts0.34 +6%
Vas312.6 L +4%
BL30 T·m +20%, better
Xmax12.2 mm −30%, worse
Sensitivity96.7 dB +0.8
Beyma21QLEX1600FE
£425.00 · 29% less, betterFs30 Hz –
Qts0.28 −12%, better
Vas309 L +3%
BL36.4 T·m +46%, better
Xmax13 mm −26%, worse
Sensitivity96.5 dB +0.6
CelestionTSQ2145
£445.00 · 25% less, betterFs30 Hz –
Qts0.34 +7%
Vas253.8 L −15%, better
BL33.8 T·m +35%, better
Xmax15 mm −14%, worse
Sensitivity94.8 dB −1.1
Dayton AudioHTS545HE-4
£447.11 · 25% less, betterFs26 Hz −12%, better
Qts0.28 −12%, better
Vas179 L −40%, better
BL38.2 T·m +53%, better
Xmax21 mm +20%, better
Sensitivity92.5 dB −3.4, worse
RCFLF21X451
£448.61 · 25% less, betterFs28 Hz −7%
Qts0.37 +16%, worse
Vas385 L +28%, worse
BL30.5 T·m +22%, better
Xmax14 mm −20%, worse
Sensitivity95.4 dB −0.5
Beyma21LEX1600ND
£475.00 · 20% less, betterFs30 Hz –
Qts0.29 −9%
Vas305 L –
BL36.6 T·m +46%, better
Xmax14 mm −20%, worse
Sensitivity96.4 dB +0.5
B&C21SW115
£475.55 · 20% less, betterFs33 Hz +10%, worse
Qts0.36 +12%, worse
Vas278 L −7%
BL24.8 T·m –
Xmax14 mm −20%, worse
Sensitivity96.3 dB –
B&C21DS115
£483.91 · 19% less, betterFs32 Hz +7%
Qts0.21 −34%, better
Vas219 L −27%, better
BL28.6 T·m +14%, better
Xmax15 mm −14%, worse
Sensitivity97.2 dB +1.3
Eighteen Sound21NLW4100
£505.48 · 15% less, betterFs34 Hz +13%, worse
Qts0.40 +25%, worse
Vas219 L −27%, better
BL22.8 T·m −9%
Xmax15.2 mm −13%, worse
Sensitivity95.1 dB −0.8
No photo
Precision DevicesPD.2155-1N
£555.00 · 7% less, betterFs33 Hz +10%, worse
Qts0.36 +12%, worse
Vas241 L −20%, better
BL30 T·m +20%, better
Xmax14 mm −20%, worse
Sensitivity95.7 dB –
B&C21SW152
£585.00 · 2% lessFs32 Hz +7%
Qts0.30 −6%
Vas200 L −33%, better
BL32.5 T·m +30%, better
Xmax15 mm −14%, worse
Sensitivity95.3 dB −0.6
Eighteen Sound21NLW9001
£586.79 · 1% lessFs31 Hz +3%
Qts0.34 +6%
Vas272 L −9%
BL23.8 T·m −5%
Xmax14 mm −20%, worse
Sensitivity95.4 dB −0.5
Eighteen Sound21NLW9601
£592.80 · Same priceFs41 Hz +37%, worse
Qts0.32 –
Vas123 L −59%, better
BL32.7 T·m +31%, better
Xmax14 mm −20%, worse
Sensitivity96.1 dB –
Eighteen Sound21NLW4000
£607.21 · 2% moreFs27 Hz −10%, better
Qts0.38 +19%, worse
Vas380 L +27%, worse
BL20 T·m −20%, worse
Xmax15 mm −14%, worse
Sensitivity94.9 dB −1
No photo
Precision DevicesPD.2160-1N
£799.00 · 34% more, worseFs35 Hz +17%, worse
Qts0.30 −6%
Vas177 L −41%, better
BL43 T·m +72%, better
Xmax16 mm −9%
Sensitivity95.9 dB –
EminenceNSW6021-124
£912.88 · 53% more, worseFs31 Hz –
Qts0.32 –
Vas224.6 L −25%, better
BL30.5 T·m +22%, better
Xmax21 mm +20%, better
Sensitivity95 dB −0.9
Eighteen Sound21NLW5300
No current priceFs31 Hz +3%
Qts0.32 –
Vas325 L +8%
BL31 T·m +24%, better
Xmax15.3 mm −13%, worse
Sensitivity96.6 dB +0.7
Eighteen Sound21LW2600
No current priceFs27 Hz −10%, better
Qts0.29 −9%
Vas332 L +11%, worse
BL24.9 T·m –
Xmax14.6 mm −17%, worse
Sensitivity95.6 dB –
No current price
Fs35 Hz +17%, worse
Qts0.34 +6%
Vas266 L −11%, better
BL31.3 T·m +25%, better
Xmax14 mm −20%, worse
Sensitivity97.1 dB +1.2
No photo
Precision DevicesPD.2155-1F
No current priceFs35 Hz +17%, worse
Qts0.34 +6%
Vas266 L −11%, better
BL31.3 T·m +25%, better
Xmax14 mm −20%, worse
Sensitivity97.1 dB +1.2
CelestionNTR21-5010JD
No current priceFs32 Hz +7%
Qts0.32 –
Vas276.7 L −8%
BL33.9 T·m +35%, better
Xmax9 mm −49%, worse
Sensitivity96.4 dB +0.5
Eighteen Sound21LW2500
No current priceFs29 Hz −3%
Qts0.37 +16%, worse
Vas305 L –
BL30 T·m +20%, better
Xmax14 mm −20%, worse
Sensitivity94.9 dB −1
No current price
Fs33 Hz +10%, worse
Qts0.36 +12%, worse
Vas241 L −20%, better
BL30 T·m +20%, better
Xmax14 mm −20%, worse
Sensitivity95.7 dB –
Sica21 S 4 PL
No current priceFs35 Hz +15%, worse
Qts0.30 −6%
Vas255 L −15%, better
BL36.1 T·m +44%, better
Xmax5.2 mm −70%, worse
Sensitivity97.4 dB +1.5
B&C21SW150
No current priceFs29 Hz −3%
Qts0.26 −19%, better
Vas254 L −15%, better
BL32.6 T·m +30%, better
Xmax15 mm −14%, worse
Sensitivity95.6 dB –
Eighteen Sound21NLW9601C
No current priceFs38 Hz +27%, worse
Qts0.29 −9%
Vas140 L −53%, better
BL33.2 T·m +33%, better
Xmax14 mm −20%, worse
Sensitivity96 dB –
P.AudioSD21-125XB
No current priceFs35 Hz +17%, worse
Qts0.38 +19%, worse
Vas345.6 L +15%, worse
BL30.4 T·m +22%, better
Xmax11.3 mm −36%, worse
Sensitivity97.7 dB +1.8
Dayton AudioPSS545HE-4
No current priceFs29 Hz −4%
Qts0.27 −16%, better
Vas212.2 L −29%, better
BL35.5 T·m +42%, better
Xmax21 mm +20%, better
Sensitivity94.6 dB −1.3
Eighteen Sound21ID
No current priceFs38 Hz +27%, worse
Qts0.23 −28%, better
Vas143 L −52%, better
BL25.2 T·m –
Xmax14 mm −20%, worse
Sensitivity97.2 dB +1.3
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 | £595.00, the lowest price | In stock | Visit shop at Lean Audio | |
Lean Business | £595.00 | Stock not listed | Visit shop at Lean Business |
Best price over time
Tracked since 1 Apr