- Net volume
- 300L
- Tuning
- 32Hz
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 21LW2500 8Ω
8 Ω · 30–1000 Hz
No price for delivery to the UK
- Fs
- 29Hz
- Xmax
- 14mm
- SPL
- 95dB
- Pe
- 1600W
- BL
- 30T·m
- Vd
- 2324cm³
- 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 64b2fe9d1910…Medium confidence653 selected pixels of 1,499 - Trace datasheet-response-trace-poc/v2
impedance
Impedance response
235 plotted pointsSource file SHA-256 64b2fe9d1910…Medium confidence735 selected pixels of 1,231
Published graphs
Eighteen Sound 21LW2500 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 14 mm, sensitivity 94.9 dB, plus 2324 cm³ Vd and 76 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
- 29Hz
- Qts
- 0.37
- Qes
- 0.38
- Qms
- 22
- Vas
- 305L
- Re
- 4.9Ω
- Le
- 2.58mH
Motor and cone
- BL
- 30T·m
- Sd
- 1660cm²
- Mms
- 380g
- Xmax
- 14mm
- Vd †
- 2324cm³
Power and response
- Sensitivity †
- 94.9dB
- Manufacturer sensitivity
- 95dB
- Power
- 1600W
- Nominal power
- 1600W
- Impedance
- 8Ω
- Range
- 30–1000Hz
- EBP †
- 76 · Sealed or vented
Size and mounting
- Diameter
- 545mm
- Cutout
- 492mm
- Bolt circle
- 520mm
- Depth
- 252mm
- Weight
- 17.9kg
Other published values
- Power Program
- 3200
† 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
- 2.58mH
- Re
- 4.9Ω
- Sd
- 1660cm²
- Mms
- 380g
- Qes
- 0.38
- Qms
- 22
- Qts
- 0.37
- SPL
- 94.9dB
- Vas
- 305L
- Xmax
- 14mm
- Power
- 1600W
- Impedance
- 8Ω
- Sensitivity
- 95dB
- Low limit
- 30Hz
- Nominal power
- 1600W
- Power Program
- 3200
- Calculated sensitivity †
- 94.9dB
- High limit
- 1000Hz
- Manufacturer sensitivity
- 95dB
- Weight
- 17.9kg
- Diameter
- 545mm
- Depth
- 252mm
- Cutout
- 492mm
- Bolt circle
- 520mm
02
Designs
What Eighteen Sound suggests for the 21LW2500. No published designs name it yet.
How we find designsEighteen Sound’s suggested box
From Eighteen Sound’s 21LW2500 page
Open this box in 00 Simulator
Modelling the box in 00 Simulator…
03
Compare
Same-size drivers, compared with the 21LW2500. Clear differences are green when better and red when worse.
This driver21LW2500
Best price
–
Fs
29 Hz
Qts
0.37
Vas
305 L
BL
30 T·m
Xmax
14 mm
Sensitivity
94.9 dB
Power
1600 W
Dayton AudioPSS555-8
£196.43Fs28 Hz −5%
Qts0.33 −11%, better
Vas444 L +46%, worse
BL29.7 T·m –
Xmax11 mm −21%, worse
Sensitivity96.4 dB +1.5
SB AudienceNERO-21SW1100D
£343.60Fs32 Hz +10%, worse
Qts0.34 −8%
Vas312.6 L –
BL30 T·m –
Xmax12.2 mm −13%, worse
Sensitivity96.7 dB +1.8
Beyma21QLEX1600FE
£425.00Fs30 Hz +3%
Qts0.28 −24%, better
Vas309 L –
BL36.4 T·m +21%, better
Xmax13 mm −7%
Sensitivity96.5 dB +1.6
Eighteen Sound21LW2600
£429.42Fs27 Hz −7%
Qts0.33 −11%, better
Vas333 L +9%
BL32.5 T·m +8%
Xmax14.6 mm +4%
Sensitivity94.9 dB –
CelestionTSQ2145
£445.00Fs30 Hz +3%
Qts0.34 −7%
Vas253.8 L −17%, better
BL33.8 T·m +13%, better
Xmax15 mm +7%
Sensitivity94.8 dB –
RCFLF21X451
£448.61Fs28 Hz −3%
Qts0.37 –
Vas385 L +26%, worse
BL30.5 T·m –
Xmax14 mm –
Sensitivity95.4 dB +0.5
Eighteen Sound21NLW4100
£456.79Fs36 Hz +24%, worse
Qts0.46 +24%, worse
Vas210 L −31%, better
BL29.4 T·m –
Xmax15.2 mm +9%
Sensitivity95 dB –
Beyma21LEX1600ND
£475.00Fs30 Hz +3%
Qts0.29 −22%, better
Vas305 L –
BL36.6 T·m +22%, better
Xmax14 mm –
Sensitivity96.4 dB +1.5
RCFLF21N451
£475.00Fs30 Hz +3%
Qts0.26 −30%, better
Vas375 L +23%, worse
BL34.5 T·m +15%, better
Xmax13 mm −7%
Sensitivity97.8 dB +2.9, better
B&C21SW152
£542.37Fs32 Hz +10%, worse
Qts0.36 –
Vas200 L −34%, better
BL39 T·m +30%, better
Xmax15 mm +7%
Sensitivity94.4 dB −0.5
Eighteen Sound21NLW9001
£554.81Fs32 Hz +10%, worse
Qts0.31 −16%, better
Vas244 L −20%, better
BL37 T·m +23%, better
Xmax14 mm –
Sensitivity95.7 dB +0.8
Eighteen Sound21NTLW5000
£595.00Fs31 Hz +7%
Qts0.36 –
Vas270 L −11%, better
BL32 T·m +7%
Xmax17.5 mm +25%, better
Sensitivity95.3 dB –
Eighteen Sound21NLW4000
£613.78Fs29 Hz –
Qts0.37 –
Vas305 L –
BL30 T·m –
Xmax15 mm +7%
Sensitivity94.9 dB –
Eighteen Sound21NLW9601
£629.38Fs37 Hz +28%, worse
Qts0.29 −22%, better
Vas175 L −43%, better
BL43 T·m +43%, better
Xmax14 mm –
Sensitivity96.6 dB +1.7
EminenceNSW6021-6
£800.00Fs29 Hz –
Qts0.31 −16%, better
Vas224.6 L −26%, better
BL33.8 T·m +13%, better
Xmax21 mm +50%, better
Sensitivity94.5 dB –
EminenceNSW6021-124
£925.57Fs31 Hz +6%
Qts0.32 −14%, better
Vas224.6 L −26%, better
BL30.5 T·m –
Xmax21 mm +50%, better
Sensitivity95 dB –
No current price
Fs33 Hz +14%, worse
Qts0.36 –
Vas241 L −21%, better
BL30 T·m –
Xmax14 mm –
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 –
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 –
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 –
Sensitivity97.1 dB +2.2, better
P.AudioSD21-125XB
No current priceFs35 Hz +21%, worse
Qts0.38 –
Vas345.6 L +13%, worse
BL30.4 T·m –
Xmax11.3 mm −20%, worse
Sensitivity97.7 dB +2.8, better
Eighteen Sound21NLW5300
No current priceFs31 Hz +7%
Qts0.32 −14%, better
Vas325 L +7%
BL31 T·m +3%
Xmax15.3 mm +9%
Sensitivity96.6 dB +1.7
BishopSoundBWN21/4
No current priceFs29 Hz –
Qts0.42 +13%, worse
Vas244.2 L −20%, better
BL32.6 T·m +9%
Xmax15 mm +7%
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 +7%
Sensitivity93.2 dB −1.7
CelestionNTR21-5010JD
No current priceFs32 Hz +11%, worse
Qts0.32 −14%, better
Vas276.7 L −9%
BL33.9 T·m +13%, better
Xmax9 mm −36%, worse
Sensitivity96.4 dB +1.5
B&C21SW150
No current priceFs29 Hz –
Qts0.26 −30%, better
Vas254 L −17%, better
BL32.6 T·m +9%
Xmax15 mm +7%
Sensitivity95.6 dB +0.7
Eighteen Sound21NLW9601C
No current priceFs38 Hz +31%, worse
Qts0.29 −22%, better
Vas140 L −54%, better
BL33.2 T·m +11%, better
Xmax14 mm –
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 −63%, worse
Sensitivity97.4 dB +2.5, better
Eighteen Sound21ID
No current priceFs38 Hz +31%, worse
Qts0.23 −38%, better
Vas143 L −53%, better
BL25.2 T·m −16%, worse
Xmax14 mm –
Sensitivity97.2 dB +2.3, 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 | £447.52 | Out of stock | Visit shop at Lean Audio | |
Lean Business | £492.21 | Out of stock | Visit shop at Lean Business |