Eighteen Sound design
1x21” band-pass subwoofer
- Drivers
- 21LW1400or 21NLW4100or 21LW2600
21-inch LF driver · 1,600 W
Eighteen Sound 21LW2600 4Ω
35–1400 Hz
No price for delivery to the UK
- Fs
- 27Hz
- Xmax
- 14.6mm
- SPL
- 96dB
- Pe
- 1600W
- BL
- 24.9T·m
- Vd
- 2426cm³
- Qts
- 0.29
- Vas
- 332L
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
95 plotted pointsSource file SHA-256 4ac24f3e21e1…Medium confidence193 selected pixels of 595 - Trace datasheet-response-trace-poc/v2
impedance
Impedance response
240 plotted pointsSource file SHA-256 4ac24f3e21e1…Medium confidence628 selected pixels of 868
Published graphs
Eighteen Sound 21LW2600 is a 21-inch 4 ohm LF driver rated at 1600 W RMS. The validated T/S data includes Fs 27 Hz, Qts 0.29, Vas 332 L, Xmax 14.6 mm, sensitivity 95.6 dB, plus 2426 cm³ Vd and 93 EBP. bits tracks vendor pricing, datasheet links, simulator import data, and similar drivers from the same loudspeaker database.
The published T/S values agree with each other
Thiele/Small
- Fs
- 27Hz
- Qts
- 0.29
- Qes
- 0.29
- Qms
- 22.8
- Vas
- 332L
- Re
- 2.6Ω
- Le
- 1.65mH
Motor and cone
- BL
- 24.9T·m
- Sd
- 1662cm²
- Mms
- 415g
- Xmax
- 14.6mm
- Vd †
- 2426cm³
Power and response
- Sensitivity †
- 95.6dB
- Manufacturer sensitivity
- 97dB
- Power
- 1600W
- Nominal power
- 1600W
- Impedance
- 4Ω
- Range
- 35–1400Hz
- EBP †
- 93 · Sealed or vented
Size and mounting
- Diameter
- 545mm
- Cutout
- 492mm
- Bolt circle
- 520mm
- Depth
- 245mm
- Weight
- 17.1kg
Other published values
- Power Program
- 3200
Sensitivity shows 95.6 dB, calculated from the T/S values. Eighteen Sound publishes 97.0 dB, 1.4 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else Eighteen Sound lists
LF · Primary · 21″
- BL
- 24.9T·m
- Fs
- 27Hz
- Le
- 1.65mH
- Re
- 2.6Ω
- Sd
- 1662cm²
- Mms
- 415g
- Qes
- 0.29
- Qms
- 22.8
- Qts
- 0.29
- SPL
- 95.6dB
- Vas
- 332L
- Xmax
- 14.6mm
- Power
- 1600W
- Impedance
- 4Ω
- Sensitivity
- 97dB
- Low limit
- 35Hz
- Nominal power
- 1600W
- Power Program
- 3200
- Calculated sensitivity †
- 95.6dB
- High limit
- 1400Hz
- Manufacturer sensitivity
- 97dB
- Weight
- 17.1kg
- Diameter
- 545mm
- Depth
- 245mm
- Cutout
- 492mm
- Bolt circle
- 520mm
02
Designs
Cabinets for the 21LW2600: a design and a suggested box from Eighteen Sound.
All 21LW2600 designsHow we find designsEighteen Sound’s design
From the maker, with plans to download
Eighteen Sound’s suggested box
From Eighteen Sound’s 21LW2600 page
- Net volume
- 250L
- Tuning
- 32Hz
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 21LW2600. Clear differences are green when better and red when worse.
This driver21LW2600
Best price
–
Fs
27 Hz
Qts
0.29
Vas
332 L
BL
24.9 T·m
Xmax
14.6 mm
Sensitivity
95.6 dB
Power
1600 W
Dayton AudioPSS555-8
£193.74Fs28 Hz –
Qts0.33 +14%, worse
Vas444 L +34%, worse
BL29.7 T·m +19%, better
Xmax11 mm −25%, worse
Sensitivity96.4 dB +0.8
SB AudienceNERO-21SW1100D
£343.60Fs32 Hz +19%, worse
Qts0.34 +17%, worse
Vas312.6 L −6%
BL30 T·m +20%, better
Xmax12.2 mm −16%, worse
Sensitivity96.7 dB +1.1
Beyma21QLEX1600FE
£425.00Fs30 Hz +11%, worse
Qts0.28 −3%
Vas309 L −7%
BL36.4 T·m +46%, better
Xmax13 mm −11%, worse
Sensitivity96.5 dB +0.9
CelestionTSQ2145
£445.00Fs30 Hz +11%, worse
Qts0.34 +19%, worse
Vas253.8 L −24%, better
BL33.8 T·m +36%, better
Xmax15 mm –
Sensitivity94.8 dB −0.8
Dayton AudioHTS545HE-4
£447.11Fs26 Hz –
Qts0.28 −3%
Vas179 L −46%, better
BL38.2 T·m +53%, better
Xmax21 mm +44%, better
Sensitivity92.5 dB −3.1, worse
RCFLF21X451
£448.61Fs28 Hz +4%
Qts0.37 +28%, worse
Vas385 L +16%, worse
BL30.5 T·m +22%, better
Xmax14 mm −4%
Sensitivity95.4 dB –
Beyma21LEX1600ND
£475.00Fs30 Hz +11%, worse
Qts0.29 –
Vas305 L −8%
BL36.6 T·m +47%, better
Xmax14 mm −4%
Sensitivity96.4 dB +0.8
RCFLF21N451
£475.00Fs30 Hz +11%, worse
Qts0.26 −10%, better
Vas375 L +13%, worse
BL34.5 T·m +39%, better
Xmax13 mm −11%, worse
Sensitivity97.8 dB +2.2, better
B&C21SW115
£475.55Fs33 Hz +22%, worse
Qts0.36 +24%, worse
Vas278 L −16%, better
BL24.8 T·m –
Xmax14 mm −4%
Sensitivity96.3 dB +0.7
B&C21DS115
£483.91Fs32 Hz +19%, worse
Qts0.21 −28%, better
Vas219 L −34%, better
BL28.6 T·m +15%, better
Xmax15 mm –
Sensitivity97.2 dB +1.6
Eighteen Sound21NLW4100
£505.48Fs34 Hz +26%, worse
Qts0.40 +38%, worse
Vas219 L −34%, better
BL22.8 T·m −8%
Xmax15.2 mm +4%
Sensitivity95.1 dB −0.5
No photo
Precision DevicesPD.2155-1N
£555.00Fs33 Hz +22%, worse
Qts0.36 +24%, worse
Vas241 L −27%, better
BL30 T·m +20%, better
Xmax14 mm −4%
Sensitivity95.7 dB –
B&C21SW152
£585.00Fs32 Hz +19%, worse
Qts0.30 +3%
Vas200 L −40%, better
BL32.5 T·m +31%, better
Xmax15 mm –
Sensitivity95.3 dB –
Eighteen Sound21NLW9001
£586.79Fs31 Hz +15%, worse
Qts0.34 +17%, worse
Vas272 L −18%, better
BL23.8 T·m −4%
Xmax14 mm −4%
Sensitivity95.4 dB –
Eighteen Sound21NLW9601
£592.80Fs41 Hz +52%, worse
Qts0.32 +10%, worse
Vas123 L −63%, better
BL32.7 T·m +31%, better
Xmax14 mm −4%
Sensitivity96.1 dB +0.5
Eighteen Sound21NTLW5000
£595.00Fs30 Hz +11%, worse
Qts0.32 +10%, worse
Vas300 L −10%
BL25 T·m –
Xmax17.5 mm +20%, better
Sensitivity95.9 dB –
Eighteen Sound21NLW4000
£607.21Fs27 Hz –
Qts0.38 +31%, worse
Vas380 L +14%, worse
BL20 T·m −20%, worse
Xmax15 mm –
Sensitivity94.9 dB −0.7
No photo
Precision DevicesPD.2160-1N
£799.00Fs35 Hz +30%, worse
Qts0.30 +3%
Vas177 L −47%, better
BL43 T·m +73%, better
Xmax16 mm +10%
Sensitivity95.9 dB –
EminenceNSW6021-124
£912.88Fs31 Hz +14%, worse
Qts0.32 +10%, worse
Vas224.6 L −32%, better
BL30.5 T·m +22%, better
Xmax21 mm +44%, better
Sensitivity95 dB −0.6
Eighteen Sound21NLW5300
No current priceFs31 Hz +15%, worse
Qts0.32 +10%, worse
Vas325 L –
BL31 T·m +24%, better
Xmax15.3 mm +5%
Sensitivity96.6 dB +1
B&C21SW150
No current priceFs29 Hz +7%
Qts0.26 −10%, better
Vas254 L −23%, better
BL32.6 T·m +31%, better
Xmax15 mm –
Sensitivity95.6 dB –
Eighteen Sound21NLW9601C
No current priceFs38 Hz +41%, worse
Qts0.29 –
Vas140 L −58%, better
BL33.2 T·m +33%, better
Xmax14 mm −4%
Sensitivity96 dB –
Eighteen Sound21ID
No current priceFs38 Hz +41%, worse
Qts0.23 −21%, better
Vas143 L −57%, better
BL25.2 T·m –
Xmax14 mm −4%
Sensitivity97.2 dB +1.6
No current price
Fs35 Hz +30%, worse
Qts0.34 +17%, worse
Vas266 L −20%, better
BL31.3 T·m +26%, better
Xmax14 mm −4%
Sensitivity97.1 dB +1.5
No photo
Precision DevicesPD.2155-1F
No current priceFs35 Hz +30%, worse
Qts0.34 +17%, worse
Vas266 L −20%, better
BL31.3 T·m +26%, better
Xmax14 mm −4%
Sensitivity97.1 dB +1.5
Eighteen Sound21LW2500
No current priceFs29 Hz +7%
Qts0.37 +28%, worse
Vas305 L −8%
BL30 T·m +20%, better
Xmax14 mm −4%
Sensitivity94.9 dB −0.7
Sica21 S 4 PL
No current priceFs35 Hz +28%, worse
Qts0.30 +3%
Vas255 L −23%, better
BL36.1 T·m +45%, better
Xmax5.2 mm −64%, worse
Sensitivity97.4 dB +1.8
No current price
Fs33 Hz +22%, worse
Qts0.36 +24%, worse
Vas241 L −27%, better
BL30 T·m +20%, better
Xmax14 mm −4%
Sensitivity95.7 dB –
Dayton AudioPSS545HE-4
No current priceFs29 Hz +7%
Qts0.27 −7%
Vas212.2 L −36%, better
BL35.5 T·m +43%, better
Xmax21 mm +44%, better
Sensitivity94.6 dB −1
CelestionNTR21-5010JD
No current priceFs32 Hz +19%, worse
Qts0.32 +10%, worse
Vas276.7 L −17%, better
BL33.9 T·m +36%, better
Xmax9 mm −38%, worse
Sensitivity96.4 dB +0.8
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 | £385.00 | Back order | Visit shop at Lean Audio |