GRS8FR-8
£17.54 · 91% less, betterFs45 Hz −31%, better
Qts0.56 −7%
Vas37.0 L +164%, worse
BL8.5 T·m +52%, better
Xmax3 mm –
Sensitivity89.3 dB –
7-inch LF driver · Revelator series · 38 mm voice coil · 120 W
Scanspeak 18M/4631T00 4Ω
4 Ω
£214.52
2.5%Willys-Hifi · All 2 offers
- Fs
- 65Hz
- Xmax
- 3mm
- SPL
- 90dB
- Pe
- 120W
- BL
- 5.6T·m
- Vd
- 46cm³
- Qts
- 0.60
- Vas
- 14L
Scanspeak 18M/4631T00 is a 7-inch 4 ohm LF driver rated at 120 W RMS. The validated T/S data includes Fs 65 Hz, Qts 0.60, Vas 14 L, Xmax 3 mm, sensitivity 89.6 dB, plus 46 cm³ Vd and 97 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 £192.54.
The published T/S values agree with each other
Thiele/Small
- Fs
- 65Hz
- Qts
- 0.60
- Qes
- 0.67
- Qms
- 5.7
- Vas
- 14L
- Re
- 3.5Ω
- Le
- 0.16mH
Motor and cone
- BL
- 5.6T·m
- Sd
- 154cm²
- Mms
- 14g
- Xmax
- 3mm
- Vd †
- 46cm³
- Voice coil
- 38mm
Power and response
- Sensitivity †
- 89.6dB
- Manufacturer sensitivity
- 92dB
- Power
- 120W
- Impedance
- 4Ω
- Min. impedance
- 3.9Ω
- EBP †
- 97 · Sealed or vented
Size and mounting
- Diameter
- 180mm
Other published values
- Cms
- 0.42mm/N
- Rms
- 1.03kg/s
- Power Peak
- 250
Sensitivity shows 89.6 dB, calculated from the T/S values. Scanspeak publishes 92.0 dB, 2.4 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else Scanspeak lists
LF · Primary · 7″
- BL
- 5.6T·m
- Fs
- 65Hz
- Le
- 0.16mH
- Re
- 3.5Ω
- Sd
- 154cm²
- Cms
- 0.42mm/N
- Mms
- 14g
- Qes
- 0.67
- Qms
- 5.7
- Qts
- 0.60
- Rms
- 1.03kg/s
- SPL
- 89.6dB
- Vas
- 14L
- Xmax
- 3mm
- Power
- 120W
- Impedance
- 4Ω
- Power Peak
- 250
- Sensitivity
- 92dB
- Calculated sensitivity †
- 89.6dB
- Manufacturer sensitivity
- 92dB
- Min. impedance
- 3.9Ω
- Voice coil
- 38mm
- Diameter
- 180mm
02
Compare
Same-size drivers, compared with the 18M/4631T00. Clear differences are green when better and red when worse.
This driver18M/4631T00
Best price
£192.54
Fs
65 Hz
Qts
0.60
Vas
14 L
BL
5.6 T·m
Xmax
3 mm
Sensitivity
89.6 dB
Power
120 W
REDCATT61FHM-2
£19.93 · 90% less, betterFs44 Hz −32%, better
Qts0.52 −13%, better
Vas14.4 L –
BL6.0 T·m +8%
Xmax3.2 mm +7%
Sensitivity85.3 dB −4.3, worse
FaitalPRO6FE125
£26.87 · 86% less, betterFs61 Hz −6%
Qts0.55 −8%
Vas15.1 L +8%
BL6.8 T·m +21%, better
Xmax5.3 mm +75%, better
Sensitivity89.6 dB –
FaitalPRO6FE100
£27.18 · 86% less, betterFs61 Hz −6%
Qts0.55 −8%
Vas15.1 L +8%
BL6.8 T·m +21%, better
Xmax5.3 mm +75%, better
Sensitivity89.6 dB –
MonacorSPM-165/8
£27.63 · 86% less, betterFs49 Hz −25%, better
Qts0.55 −8%
Vas33 L +136%, worse
BL5.8 T·m +4%
Xmax3 mm –
Sensitivity89.7 dB –
MonacorSPH-174KE
£29.31 · 85% less, betterFs42 Hz −35%, better
Qts0.51 −15%, better
Vas26 L +86%, worse
BL5.9 T·m +6%
Xmax3 mm –
Sensitivity86.8 dB −2.8, worse
Dayton AudioDA175-8
£29.91 · 84% less, betterFs39 Hz −40%, better
Qts0.58 −3%
Vas16.3 L +16%, worse
BL7.2 T·m +28%, better
Xmax4.3 mm +42%, better
Sensitivity83.4 dB −6.2, worse
Dayton AudioMB620-8
£33.65 · 83% less, betterFs104 Hz +60%, worse
Qts0.59 –
Vas6.8 L −52%, better
BL6.7 T·m +19%, better
Xmax2 mm −33%, worse
Sensitivity92.5 dB +2.9, better
PRV Audio6MR400-4
£48.52 · 75% less, betterFs144 Hz +122%, worse
Qts0.60 –
Vas4.4 L −69%, better
BL6.4 T·m +14%, better
Xmax3.3 mm +8%
Sensitivity95.2 dB +5.6, better
Scanspeak15W/4424G00
£53.55 · 72% less, betterFs46 Hz −29%, better
Qts0.24 −60%, better
Vas13.8 L –
BL5.2 T·m −7%
Xmax2.8 mm −7%
Sensitivity89.2 dB –
EminenceALPHA-8A
£54.66 · 72% less, betterFs73 Hz +12%, worse
Qts0.59 –
Vas17.7 L +26%, worse
BL7.8 T·m +39%, better
Xmax3.2 mm +7%
Sensitivity92.1 dB +2.5, better
WavecorWF168WA06
£57.60 · 70% less, betterFs41 Hz −37%, better
Qts0.50 −17%, better
Vas27.7 L +98%, worse
BL6.4 T·m +14%, better
Xmax3 mm –
Sensitivity87.5 dB −2.1, worse
WavecorWF168WA02
£60.59 · 69% less, betterFs49 Hz −25%, better
Qts0.52 −13%, better
Vas24.6 L +76%, worse
BL6.4 T·m +14%, better
Xmax3 mm –
Sensitivity89.2 dB –
VisatonW 165 A
£72.80 · 62% less, betterFs60 Hz −8%
Qts0.63 +5%
Vas7.8 L −44%, better
BL5.0 T·m −11%, worse
Xmax4.7 mm +55%, better
Sensitivity85.6 dB −4, worse
CIARECX171
£78.29 · 59% less, betterFs67 Hz +3%
Qts0.55 −8%
Vas13.6 L –
BL4.6 T·m −18%, worse
Xmax4.3 mm +43%, better
Sensitivity90 dB –
Tang BandW6-2144
£141.51 · 27% less, betterFs45 Hz −31%, better
Qts0.45 −25%, better
Vas34.6 L +147%, worse
BL5.5 T·m –
Xmax3 mm –
Sensitivity89.1 dB −0.5
B&C6NSM51
£149.04 · 23% less, betterFs280 Hz +331%, worse
Qts0.60 –
Vas0.7 L −95%, better
BL13.9 T·m +148%, better
Xmax2.8 mm −7%
Sensitivity95.6 dB +6, better
Scanspeak15M/4531K00
£150.70 · 22% less, betterFs42 Hz −35%, better
Qts0.27 −55%, better
Vas16 L +14%, worse
BL6 T·m +7%
Xmax3 mm –
Sensitivity88.3 dB −1.3
Scanspeak18M/8631T00
£192.54 · Same priceFs65 Hz –
Qts0.71 +18%, worse
Vas14 L –
BL6.5 T·m +16%, better
Xmax3 mm –
Sensitivity88.7 dB −0.9
PRV Audio69FR250-4
No current priceFs82 Hz +26%, worse
Qts0.70 +17%, worse
Vas13.9 L –
BL6.1 T·m +9%
Xmax3.5 mm +17%, better
Sensitivity92.2 dB +2.6, better
MonacorSPM-205/4
No current priceFs37 Hz −43%, better
Qts0.55 −8%
Vas72 L +414%, worse
BL4.8 T·m −15%, worse
Xmax3 mm –
Sensitivity89.3 dB –
PRV Audio8MR500-NDY-4
No current priceFs79 Hz +21%, worse
Qts0.54 −10%
Vas24.3 L +74%, worse
BL6.0 T·m +8%
Xmax3 mm –
Sensitivity95.2 dB +5.6, better
No photo
LavoceCSF061.21
No current priceFs90 Hz +38%, worse
Qts0.67 +12%, worse
Vas8.5 L −39%, better
BL6.1 T·m +9%
Xmax3.2 mm +7%
Sensitivity91 dB +1.4
PRV Audio8MR400B-4
No current priceFs93 Hz +43%, worse
Qts0.74 +23%, worse
Vas15.7 L +12%, worse
BL6.3 T·m +13%, better
Xmax3.3 mm +8%
Sensitivity94.2 dB +4.6, better
PRV Audio8MR450CF-4
No current priceFs83 Hz +27%, worse
Qts0.71 +18%, worse
Vas17.5 L +25%, worse
BL6.1 T·m +8%
Xmax3.5 mm +17%, better
Sensitivity93.4 dB +3.8, better
MonacorSP-202PA
No current priceFs68 Hz +5%
Qts1.10 +83%, worse
Vas12 L −14%, better
BL5.6 T·m –
Xmax3 mm –
Sensitivity84.3 dB −5.3, worse
Lii AudioST-5
No current priceFs56 Hz −14%, better
Qts0.66 +10%, worse
Vas14.3 L –
BL5.8 T·m +4%
Xmax4 mm +33%, better
Sensitivity86.7 dB −2.9, worse
LavoceMAN061.80
No current priceFs172 Hz +165%, worse
Qts0.57 −5%
Vas1.6 L −89%, better
BL11.0 T·m +97%, better
Xmax3 mm –
Sensitivity93 dB +3.4, better
PRV Audio6MB400-4
No current priceFs125 Hz +92%, worse
Qts0.52 −13%, better
Vas5.3 L −62%, better
BL6.6 T·m +18%, better
Xmax3 mm –
Sensitivity94.7 dB +5.1, better
CIAREHMB165
No current priceFs86 Hz +32%, worse
Qts0.53 −12%, better
Vas8.6 L −39%, better
BL7 T·m +25%, better
Xmax3.5 mm +17%, better
Sensitivity91.4 dB +1.8
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 |
|---|---|---|---|---|
Willys-Hifi | £214.52, the lowest price | Stock not listed | Visit shop at Willys-Hifi | |
SoundImports Import VAT and duty may apply | £192.54 | 14 in stock | Visit shop at SoundImports |
Best price over time
Tracked since 1 Apr
Recent changes
- 1 OctWillys-Hifi£219.95 → £214.52Down 2.5% from £219.95
- 30 SepWillys-Hifi£218.95 → £219.95Up 0.5% from £218.95
- 29 SepWillys-Hifi£219.95 → £218.95Down 0.5% from £219.95