Eighteen Sound design
1x21” band-pass subwoofer
- Drivers
- 21LW1400or 21NLW4100or 21LW2600
21-inch LF driver · 1,600 W
Eighteen Sound 21LW2600 8Ω
35–1400 Hz
No price for delivery to the UK
- Fs
- 27Hz
- Xmax
- 14.6mm
- SPL
- 95dB
- Pe
- 1600W
- BL
- 32.5T·m
- Vd
- 2424cm³
- Qts
- 0.33
- Vas
- 333L
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
119 plotted pointsMedium confidence407 selected pixels of 737 - Trace datasheet-response-trace-poc/v1
impedance
Impedance response
240 plotted pointsMedium confidence561 selected pixels of 805
Published graphs
Eighteen Sound 21LW2600 is a 21-inch 8 ohm LF driver rated at 1600 W RMS. The validated T/S data includes Fs 27 Hz, Qts 0.33, Vas 333 L, Xmax 14.6 mm, sensitivity 94.9 dB, plus 2424 cm³ Vd and 79 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 £425.60.
The published T/S values agree with each other
Thiele/Small
- Fs
- 27Hz
- Qts
- 0.33
- Qes
- 0.34
- Qms
- 23.1
- Vas
- 333L
- Re
- 5.2Ω
- Le
- 2.67mH
Motor and cone
- BL
- 32.5T·m
- Sd
- 1660cm²
- Mms
- 398g
- Xmax
- 14.6mm
- Vd †
- 2424cm³
Power and response
- Sensitivity †
- 94.9dB
- Manufacturer sensitivity
- 97dB
- Power
- 1600W
- Nominal power
- 1600W
- Impedance
- 8Ω
- Range
- 35–1400Hz
- EBP †
- 79 · 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 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
- 32.5T·m
- Fs
- 27Hz
- Le
- 2.67mH
- Re
- 5.2Ω
- Sd
- 1660cm²
- Mms
- 398g
- Qes
- 0.34
- Qms
- 23.1
- Qts
- 0.33
- SPL
- 94.9dB
- Vas
- 333L
- Xmax
- 14.6mm
- Power
- 1600W
- Impedance
- 8Ω
- Sensitivity
- 97dB
- Low limit
- 35Hz
- Nominal power
- 1600W
- Power Program
- 3200
- Calculated sensitivity †
- 94.9dB
- 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
- 300L
- 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 21LW2600. Clear differences are green when better and red when worse.
This driver21LW2600
Best price
£425.60
Fs
27 Hz
Qts
0.33
Vas
333 L
BL
32.5 T·m
Xmax
14.6 mm
Sensitivity
94.9 dB
Power
1600 W
Dayton AudioPSS555-8
£194.48 · 54% less, betterFs28 Hz –
Qts0.33 –
Vas444 L +33%, worse
BL29.7 T·m −9%
Xmax11 mm −25%, worse
Sensitivity96.4 dB +1.5
SB AudienceNERO-21SW1100D
£343.60 · 19% less, betterFs32 Hz +19%, worse
Qts0.34 +3%
Vas312.6 L −6%
BL30 T·m −8%
Xmax12.2 mm −16%, worse
Sensitivity96.7 dB +1.8
CelestionTSQ2145
£445.00 · 5% moreFs30 Hz +11%, worse
Qts0.34 +4%
Vas253.8 L −24%, better
BL33.8 T·m +4%
Xmax15 mm –
Sensitivity94.8 dB –
RCFLF21X451
£448.61 · 5% more, worseFs28 Hz +4%
Qts0.37 +12%, worse
Vas385 L +16%, worse
BL30.5 T·m −6%
Xmax14 mm −4%
Sensitivity95.4 dB +0.5
Eighteen Sound21NLW4100
£456.79 · 7% more, worseFs36 Hz +33%, worse
Qts0.46 +39%, worse
Vas210 L −37%, better
BL29.4 T·m −10%
Xmax15.2 mm +4%
Sensitivity95 dB –
B&C21SW115
£458.85 · 8% more, worseFs30 Hz +11%, worse
Qts0.37 +12%, worse
Vas318 L −5%
BL30.1 T·m −7%
Xmax14 mm −4%
Sensitivity95.5 dB +0.6
Beyma21LEX1600ND
£475.00 · 12% more, worseFs30 Hz +11%, worse
Qts0.29 −12%, better
Vas305 L −8%
BL36.6 T·m +13%, better
Xmax14 mm −4%
Sensitivity96.4 dB +1.5
RCFLF21N451
£475.00 · 12% more, worseFs30 Hz +11%, worse
Qts0.26 −21%, better
Vas375 L +13%, worse
BL34.5 T·m +6%
Xmax13 mm −11%, worse
Sensitivity97.8 dB +2.9, better
B&C21DS115
£475.59 · 12% more, worseFs34 Hz +26%, worse
Qts0.27 −18%, better
Vas204 L −39%, better
BL39.3 T·m +21%, better
Xmax16.5 mm +13%, better
Sensitivity96.6 dB +1.7
Beyma21QLEX1600FE
£493.97 · 16% more, worseFs30 Hz +11%, worse
Qts0.28 −15%, better
Vas309 L −7%
BL36.4 T·m +12%, better
Xmax13 mm −11%, worse
Sensitivity96.5 dB +1.6
B&C21SW152
£537.55 · 26% more, worseFs32 Hz +19%, worse
Qts0.36 +9%
Vas200 L −40%, better
BL39 T·m +20%, better
Xmax15 mm –
Sensitivity94.4 dB −0.5
Eighteen Sound21LW1400
£543.74 · 28% more, worseFs28 Hz +4%
Qts0.24 −27%, better
Vas385 L +16%, worse
BL33.5 T·m +3%
Xmax9.5 mm −35%, worse
Sensitivity97.5 dB +2.6, better
Eighteen Sound21NLW9001
£549.89 · 29% more, worseFs32 Hz +19%, worse
Qts0.31 −6%
Vas244 L −27%, better
BL37 T·m +14%, better
Xmax14 mm −4%
Sensitivity95.7 dB +0.8
No photo
Precision DevicesPD.2155-1N
£555.00 · 30% more, worseFs33 Hz +22%, worse
Qts0.36 +9%
Vas241 L −28%, better
BL30 T·m −8%
Xmax14 mm −4%
Sensitivity95.7 dB +0.8
Eighteen Sound21NTLW5000
£595.00 · 40% more, worseFs31 Hz +15%, worse
Qts0.36 +9%
Vas270 L −19%, better
BL32 T·m –
Xmax17.5 mm +20%, better
Sensitivity95.3 dB –
Eighteen Sound21NLW4000
£608.33 · 43% more, worseFs29 Hz +7%
Qts0.37 +12%, worse
Vas305 L −8%
BL30 T·m −8%
Xmax15 mm –
Sensitivity94.9 dB –
Eighteen Sound21NLW9601
£623.80 · 47% more, worseFs37 Hz +37%, worse
Qts0.29 −12%, better
Vas175 L −47%, better
BL43 T·m +32%, better
Xmax14 mm −4%
Sensitivity96.6 dB +1.7
No photo
Precision DevicesPD.2160-1N
£799.00 · 88% more, worseFs35 Hz +30%, worse
Qts0.30 −9%
Vas177 L −47%, better
BL43 T·m +32%, better
Xmax16 mm +10%
Sensitivity95.9 dB +1
EminenceNSW6021-124
£916.36 · 115% more, worseFs31 Hz +14%, worse
Qts0.32 −3%
Vas224.6 L −33%, better
BL30.5 T·m −6%
Xmax21 mm +44%, better
Sensitivity95 dB –
Eighteen Sound21NLW5300
No current priceFs31 Hz +15%, worse
Qts0.32 −3%
Vas325 L –
BL31 T·m −5%
Xmax15.3 mm +5%
Sensitivity96.6 dB +1.7
No current price
Fs35 Hz +30%, worse
Qts0.34 –
Vas266 L −20%, better
BL31.3 T·m −4%
Xmax14 mm −4%
Sensitivity97.1 dB +2.2, better
No photo
Precision DevicesPD.2155-1F
No current priceFs35 Hz +30%, worse
Qts0.34 –
Vas266 L −20%, better
BL31.3 T·m −4%
Xmax14 mm −4%
Sensitivity97.1 dB +2.2, better
Eighteen Sound21LW2500
No current priceFs29 Hz +7%
Qts0.37 +12%, worse
Vas305 L −8%
BL30 T·m −8%
Xmax14 mm −4%
Sensitivity94.9 dB –
No current price
Fs33 Hz +22%, worse
Qts0.36 +9%
Vas241 L −28%, better
BL30 T·m −8%
Xmax14 mm −4%
Sensitivity95.7 dB +0.8
CelestionNTR21-5010JD
No current priceFs32 Hz +19%, worse
Qts0.32 −3%
Vas276.7 L −17%, better
BL33.9 T·m +4%
Xmax9 mm −38%, worse
Sensitivity96.4 dB +1.5
B&C21SW150
No current priceFs29 Hz +7%
Qts0.26 −21%, better
Vas254 L −24%, better
BL32.6 T·m –
Xmax15 mm –
Sensitivity95.6 dB +0.7
Eighteen Sound21NLW9601C
No current priceFs38 Hz +41%, worse
Qts0.29 −12%, better
Vas140 L −58%, better
BL33.2 T·m –
Xmax14 mm −4%
Sensitivity96 dB +1.1
P.AudioSD21-125XB
No current priceFs35 Hz +30%, worse
Qts0.38 +15%, worse
Vas345.6 L +4%
BL30.4 T·m −6%
Xmax11.3 mm −23%, worse
Sensitivity97.7 dB +2.8, better
Sica21 S 4 PL
No current priceFs35 Hz +28%, worse
Qts0.30 −9%
Vas255 L −23%, better
BL36.1 T·m +11%, better
Xmax5.2 mm −64%, worse
Sensitivity97.4 dB +2.5, better
Dayton AudioPSS545HE-4
No current priceFs29 Hz +7%
Qts0.27 −18%, better
Vas212.2 L −36%, better
BL35.5 T·m +9%
Xmax21 mm +44%, better
Sensitivity94.6 dB –
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 |