- Net volume
- 6L
- Tuning
- 100Hz
Eighteen Sound gives the volume and tuning; the port is sized for the driver when you open it.
8-inch LF driver · 250 W
Eighteen Sound 8M400F 8Ω
8 Ω · 200–9000 Hz
£114.19
SteadyLean Audio · 2 in stock · All 2 offers
- Fs
- 89Hz
- Xmax
- 3mm
- SPL
- 97dB
- Pe
- 250W
- BL
- 13.1T·m
- Vd
- 68cm³
- Qts
- 0.26
- Vas
- 14L
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
173 plotted pointsMedium confidence2,657 selected pixels of 2,657 - Trace datasheet-response-trace-poc/v1
impedance
Impedance response
240 plotted pointsMedium confidence1,814 selected pixels of 1,950
Published graphs
Eighteen Sound 8M400F is an 8-inch 8 ohm LF driver rated at 250 W RMS. The validated T/S data includes Fs 89 Hz, Qts 0.26, Vas 13.7 L, Xmax 3 mm, sensitivity 97.4 dB, plus 68 cm³ Vd and 318 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 £114.19.
The published T/S values agree with each other
Thiele/Small
- Fs
- 89Hz
- Qts
- 0.26
- Qes
- 0.28
- Qms
- 4.0
- Vas
- 13.7L
- Re
- 5.1Ω
- Le
- 0.70mH
Motor and cone
- BL
- 13.1T·m
- Sd
- 227cm²
- Mms
- 17g
- Xmax
- 3mm
- Vd †
- 68cm³
Power and response
- Sensitivity †
- 97.4dB
- Manufacturer sensitivity
- 100.5dB
- Power
- 250W
- Nominal power
- 250W
- Impedance
- 8Ω
- Range
- 200–9000Hz
- EBP †
- 318 · Leans vented
Size and mounting
- Diameter
- 210mm
- Cutout
- 186mm
- Bolt circle
- 196mm
- Depth
- 106mm
- Weight
- 4.9kg
Other published values
- Power Program
- 320
Sensitivity shows 97.4 dB, calculated from the T/S values. Eighteen Sound publishes 100.5 dB, 3.1 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else Eighteen Sound lists
LF · Primary · 8″
- BL
- 13.1T·m
- Fs
- 89Hz
- Le
- 0.70mH
- Re
- 5.1Ω
- Sd
- 227cm²
- Mms
- 17g
- Qes
- 0.28
- Qms
- 4.0
- Qts
- 0.26
- SPL
- 97.4dB
- Vas
- 13.7L
- Xmax
- 3mm
- Power
- 250W
- Impedance
- 8Ω
- Sensitivity
- 100.5dB
- Low limit
- 200Hz
- Nominal power
- 250W
- Power Program
- 320
- Calculated sensitivity †
- 97.4dB
- High limit
- 9000Hz
- Manufacturer sensitivity
- 100.5dB
- Weight
- 4.9kg
- Diameter
- 210mm
- Depth
- 106mm
- Cutout
- 186mm
- Bolt circle
- 196mm
02
Designs
What Eighteen Sound suggests for the 8M400F. No published designs name it yet.
How we find designsEighteen Sound’s suggested box
From Eighteen Sound’s 8M400F page
Open this box in 00 Simulator
Modelling the box in 00 Simulator…
03
Compare
Same-size drivers, compared with the 8M400F. Clear differences are green when better and red when worse.
This driver8M400F
Best price
£114.19
Fs
89 Hz
Qts
0.26
Vas
13.7 L
BL
13.1 T·m
Xmax
3 mm
Sensitivity
97.4 dB
Power
250 W
REDCATT8FIND
£57.77 · 49% less, betterFs70 Hz −21%, better
Qts0.25 −4%
Vas18.2 L +33%, worse
BL14.3 T·m +9%
Xmax2.2 mm −27%, worse
Sensitivity96 dB −1.4
CIAREFXI8
£67.65 · 41% less, betterFs81 Hz −9%
Qts0.29 +12%, worse
Vas13 L −5%
BL13.3 T·m –
Xmax4.5 mm +50%, better
Sensitivity95.4 dB −2, worse
Beyma8WRS300
£75.41 · 34% less, betterFs65 Hz −27%, better
Qts0.28 +8%
Vas15 L +9%
BL15.2 T·m +16%, better
Xmax6 mm +100%, better
Sensitivity93.4 dB −4, worse
Sica8 FE 2.5 CP
£82.89 · 27% less, betterFs73 Hz −18%, better
Qts0.28 +8%
Vas15.6 L +14%, worse
BL13.0 T·m –
Xmax4 mm +33%, better
Sensitivity95.1 dB −2.3, worse
Beyma8WR300
£90.05 · 21% less, betterFs65 Hz −27%, better
Qts0.27 +4%
Vas15 L +9%
BL15.5 T·m +18%, better
Xmax6 mm +100%, better
Sensitivity93.6 dB −3.8, worse
Sica8 C 2 CP
£92.02 · 19% less, betterFs79 Hz −12%, better
Qts0.30 +15%, worse
Vas14.7 L +7%
BL13.5 T·m +3%
Xmax3.5 mm +17%, better
Sensitivity95.5 dB −1.9
FaitalPRO8PR210
£100.24 · 12% less, betterFs65 Hz −27%, better
Qts0.29 +12%, worse
Vas15.4 L +12%, worse
BL13.5 T·m +3%
Xmax6.9 mm +131%, better
Sensitivity93.2 dB −4.2, worse
Sica8 N 2.5 PL
£124.76 · 9% more, worseFs77 Hz −13%, better
Qts0.30 +15%, worse
Vas13.7 L –
BL12.9 T·m –
Xmax3.5 mm +17%, better
Sensitivity94.8 dB −2.6, worse
Eighteen Sound8NW650
£138.53 · 21% more, worseFs63 Hz −29%, better
Qts0.25 −4%
Vas17.8 L +30%, worse
BL15.2 T·m +16%, better
Xmax5.5 mm +83%, better
Sensitivity94.2 dB −3.2, worse
CelestionFTX0820
£139.00 · 22% more, worseFs79 Hz −11%, better
Qts0.28 +7%
Vas13.1 L −4%
BL14.6 T·m +11%, better
Xmax4 mm +33%, better
Sensitivity95.2 dB −2.2, worse
RCFMB8N251
£149.04 · 31% more, worseFs68 Hz −24%, better
Qts0.25 −4%
Vas13 L −5%
BL15.2 T·m +16%, better
Xmax5 mm +67%, better
Sensitivity94 dB −3.4, worse
Sica8 K 3 PL
£158.25 · 39% more, worseFs68 Hz −23%, better
Qts0.25 −4%
Vas12.2 L −11%, better
BL16.1 T·m +23%, better
Xmax5 mm +67%, better
Sensitivity93.6 dB −3.8, worse
WavecorWF211PA02
£185.52 · 62% more, worseFs59 Hz −34%, better
Qts0.25 −4%
Vas18.2 L +33%, worse
BL13.4 T·m –
Xmax2 mm −33%, worse
Sensitivity93.6 dB −3.8, worse
WavecorWF211PA01
£185.52 · 62% more, worseFs68 Hz −24%, better
Qts0.29 +12%, worse
Vas13.6 L –
BL10.7 T·m −18%, worse
Xmax2 mm −33%, worse
Sensitivity93.6 dB −3.8, worse
B&C8CXN51
£224.40 · 97% more, worseFs68 Hz −24%, better
Qts0.27 +4%
Vas17 L +24%, worse
BL12.6 T·m −4%
Xmax6 mm +100%, better
Sensitivity94.7 dB −2.7, worse
FaitalPRO8HX200
£225.24 · 97% more, worseFs76 Hz −15%, better
Qts0.30 +15%, worse
Vas13.1 L −4%
BL13.8 T·m +5%
Xmax4.9 mm +64%, better
Sensitivity94.7 dB −2.7, worse
BMS8CN552
£262.59 · 130% more, worseFs88 Hz –
Qts0.29 +12%, worse
Vas10.1 L −26%, better
BL13.4 T·m –
Xmax4 mm +33%, better
Sensitivity95.6 dB −1.8
FaitalPRO8HX240
£278.82 · 144% more, worseFs70 Hz −21%, better
Qts0.30 +15%, worse
Vas12.9 L −6%
BL13.8 T·m +5%
Xmax6.2 mm +106%, better
Sensitivity93.6 dB −3.8, worse
Acoustic EleganceTD8M-8
No current priceFs76 Hz −15%, better
Qts0.26 –
Vas11.3 L −18%, better
BL15.5 T·m +18%, better
Xmax3 mm –
Sensitivity94.6 dB −2.8, worse
LavoceCAN082.00K
No current priceFs72 Hz −19%, better
Qts0.27 +4%
Vas15.1 L +10%, worse
BL13.2 T·m –
Xmax6.7 mm +123%, better
Sensitivity94.8 dB −2.6, worse
Oberton8NM201
No current priceFs103 Hz +16%, worse
Qts0.29 +10%
Vas8.1 L −41%, better
BL13.7 T·m +5%
Xmax2.8 mm −8%
Sensitivity96.8 dB −0.6
Oberton8NMB250V4
No current priceFs82 Hz −8%
Qts0.26 –
Vas10.9 L −21%, better
BL14.3 T·m +9%
Xmax4.5 mm +50%, better
Sensitivity95.5 dB −1.9
Oberton8NB201
No current priceFs71 Hz −21%, better
Qts0.24 −6%
Vas12.5 L −8%
BL14.4 T·m +10%, better
Xmax5.3 mm +75%, better
Sensitivity94.4 dB −3, worse
JensenBP8150-8
No current priceFs75 Hz −16%, better
Qts0.33 +27%, worse
Vas13.1 L −4%
BL13.3 T·m –
Xmax3.1 mm +3%
Sensitivity93.8 dB −3.6, worse
PRV Audio8MR600X-NDY
No current priceFs88 Hz –
Qts0.29 +12%, worse
Vas12.6 L −8%
BL15.2 T·m +16%, better
Xmax3.8 mm +25%, better
Sensitivity96.5 dB −0.9
REDCATT8NPM
No current priceFs79 Hz −11%, better
Qts0.29 +12%, worse
Vas10.9 L −20%, better
BL14.2 T·m +8%
Xmax3.7 mm +23%, better
Sensitivity94.4 dB −3, worse
Sica8 CX 2.5 PL P
No current priceFs74 Hz −17%, better
Qts0.28 +8%
Vas16.2 L +18%, worse
BL12.3 T·m −6%
Xmax5 mm +67%, better
Sensitivity95.1 dB −2.3, worse
No photo
PHL Audio2720
No current priceFs50 Hz −44%, better
Qts0.26 –
Vas29.2 L +113%, worse
BL12.6 T·m −4%
Xmax9 mm +200%, better
Sensitivity93.3 dB −4.1, worse
No photo
PHL Audio2730
No current priceFs42 Hz −53%, better
Qts0.26 –
Vas34.1 L +149%, worse
BL12.6 T·m −4%
Xmax7 mm +133%, better
Sensitivity91.7 dB −5.7, worse
Oberton8M250
No current priceFs74 Hz −16%, better
Qts0.20 −23%, better
Vas15.6 L +14%, worse
BL13.7 T·m +5%
Xmax2.8 mm −8%
Sensitivity97 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 | £114.19, the lowest price | 2 in stock | Visit shop at Lean Audio |
Best price over time
Tracked since 1 Apr
Recent changes
- 27 AugLean Audio£124.97 → £114.19Down 8.6% from £124.97