GRS6PR-8
£13.36 · 93% less, betterFs69 Hz +6%
Qts0.87 +23%, worse
Vas10.6 L −24%, better
BL6.1 T·m −6%
Xmax3 mm –
Sensitivity86.8 dB −1.9
7-inch LF driver · Revelator series · 38 mm voice coil · 120 W
Scanspeak 18M/8631T00 8Ω
8 Ω
£214.52
2.5%Willys-Hifi · All 2 offers
- Fs
- 65Hz
- Xmax
- 3mm
- SPL
- 89dB
- Pe
- 120W
- BL
- 6.5T·m
- Vd
- 46cm³
- Qts
- 0.71
- Vas
- 14L
Scanspeak 18M/8631T00 is a 7-inch 8 ohm LF driver rated at 120 W RMS. The validated T/S data includes Fs 65 Hz, Qts 0.71, Vas 14 L, Xmax 3 mm, sensitivity 88.7 dB, plus 46 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 £192.54.
The published T/S values agree with each other
Thiele/Small
- Fs
- 65Hz
- Qts
- 0.71
- Qes
- 0.82
- Qms
- 5.2
- Vas
- 14L
- Re
- 6Ω
- Le
- 0.22mH
Motor and cone
- BL
- 6.5T·m
- Sd
- 154cm²
- Mms
- 14g
- Xmax
- 3mm
- Vd †
- 46cm³
- Voice coil
- 38mm
Power and response
- Sensitivity †
- 88.7dB
- Manufacturer sensitivity
- 89dB
- Power
- 120W
- Impedance
- 8Ω
- Min. impedance
- 6.3Ω
- EBP †
- 79 · Sealed or vented
Size and mounting
- Diameter
- 180mm
Other published values
- Cms
- 0.42mm/N
- Rms
- 1.11kg/s
- Xmech
- 14.5
- Power Peak
- 250
† Calculated by bits from the published values
What this validation status means
Everything else Scanspeak lists
LF · Primary · 7″
- BL
- 6.5T·m
- Fs
- 65Hz
- Le
- 0.22mH
- Re
- 6Ω
- Sd
- 154cm²
- Cms
- 0.42mm/N
- Mms
- 14g
- Qes
- 0.82
- Qms
- 5.2
- Qts
- 0.71
- Rms
- 1.11kg/s
- SPL
- 88.7dB
- Vas
- 14L
- Xmax
- 3mm
- Xmech
- 14.5
- Power
- 120W
- Impedance
- 8Ω
- Power Peak
- 250
- Sensitivity
- 89dB
- Calculated sensitivity †
- 88.7dB
- Manufacturer sensitivity
- 89dB
- Min. impedance
- 6.3Ω
- Voice coil
- 38mm
- Diameter
- 180mm
02
Compare
Same-size drivers, compared with the 18M/8631T00. Clear differences are green when better and red when worse.
This driver18M/8631T00
Best price
£192.54
Fs
65 Hz
Qts
0.71
Vas
14 L
BL
6.5 T·m
Xmax
3 mm
Sensitivity
88.7 dB
Power
120 W
GRS6PT-8
£15.70 · 92% less, betterFs94 Hz +45%, worse
Qts0.72 –
Vas9.5 L −32%, better
BL6.4 T·m –
Xmax4.2 mm +40%, better
Sensitivity91.7 dB +3, better
VisatonBG 17
£18.25 · 91% less, betterFs120 Hz +85%, worse
Qts0.74 +4%
Vas8.2 L −41%, better
BL5.7 T·m −12%, worse
Xmax1.5 mm −50%, worse
Sensitivity93.6 dB +4.9, better
REDCATT61FHM-2
£19.93 · 90% less, betterFs44 Hz −32%, better
Qts0.52 −27%, better
Vas14.4 L –
BL6.0 T·m −7%
Xmax3.2 mm +7%
Sensitivity85.3 dB −3.4, worse
PRV Audio6MR250B-4
£26.11 · 86% less, betterFs143 Hz +120%, worse
Qts0.82 +15%, worse
Vas4 L −71%, better
BL5.8 T·m −10%, worse
Xmax3.3 mm +8%
Sensitivity93.4 dB +4.7, better
MonacorSPM-165/8
£27.63 · 86% less, betterFs49 Hz −25%, better
Qts0.55 −23%, better
Vas33 L +136%, worse
BL5.8 T·m −11%, worse
Xmax3 mm –
Sensitivity89.7 dB +1
Dayton AudioDA175-8
£29.91 · 84% less, betterFs39 Hz −40%, better
Qts0.58 −18%, better
Vas16.3 L +16%, worse
BL7.2 T·m +10%, better
Xmax4.3 mm +42%, better
Sensitivity83.4 dB −5.3, worse
MonacorSPM-205/8
£38.40 · 80% less, betterFs37 Hz −43%, better
Qts0.70 –
Vas54 L +286%, worse
BL6.5 T·m –
Xmax3 mm –
Sensitivity86.8 dB −1.9
Dayton AudioLW150-4
£41.13 · 79% less, betterFs63 Hz −4%
Qts0.64 −10%
Vas3.5 L −75%, better
BL6.5 T·m –
Xmax4 mm +33%, better
Sensitivity82.8 dB −5.9, worse
MonacorSP-202E
£41.78 · 78% less, betterFs51 Hz −22%, better
Qts0.69 –
Vas39 L +179%, worse
BL4.9 T·m −25%, worse
Xmax2.5 mm −17%, worse
Sensitivity90.1 dB +1.4
Sica8 H 1.5 CS
£44.29 · 77% less, betterFs51 Hz −22%, better
Qts0.72 –
Vas26.9 L +92%, worse
BL7.0 T·m +8%
Xmax4 mm +33%, better
Sensitivity87.7 dB −1
PRV Audio6MR400-4
£48.52 · 75% less, betterFs144 Hz +122%, worse
Qts0.60 −15%, better
Vas4.4 L −69%, better
BL6.4 T·m –
Xmax3.3 mm +8%
Sensitivity95.2 dB +6.5, better
Scanspeak15W/8424G00
£49.40 · 74% less, betterFs46 Hz −29%, better
Qts0.25 −65%, better
Vas14.5 L +4%
BL6.6 T·m –
Xmax2.6 mm −13%, worse
Sensitivity89.2 dB +0.5
EminenceALPHA-8A
£54.66 · 72% less, betterFs73 Hz +12%, worse
Qts0.59 −17%, better
Vas17.7 L +26%, worse
BL7.8 T·m +20%, better
Xmax3.2 mm +7%
Sensitivity92.1 dB +3.4, better
PeerlessSLS-P830667
£66.94 · 65% less, betterFs46 Hz −29%, better
Qts0.75 +6%
Vas19 L +36%, worse
BL8.3 T·m +28%, better
Xmax11.1 mm +270%, better
Sensitivity85.5 dB −3.2, worse
LavoceCSF061.70K
£86.22 · 55% less, betterFs97 Hz +49%, worse
Qts0.69 –
Vas6.5 L −54%, better
BL6.9 T·m +6%
Xmax3.9 mm +30%, better
Sensitivity90.5 dB +1.8
Tang BandW8-2145
£150.67 · 22% less, betterFs40 Hz −38%, better
Qts0.45 −37%, better
Vas67.7 L +383%, worse
BL6.6 T·m –
Xmax3 mm –
Sensitivity90.5 dB +1.8
Scanspeak15M/4531K00
£150.70 · 22% less, betterFs42 Hz −35%, better
Qts0.27 −62%, better
Vas16 L +14%, worse
BL6 T·m −8%
Xmax3 mm –
Sensitivity88.3 dB –
Scanspeak15M/8631G00
£167.42 · 13% less, betterFs42 Hz −35%, better
Qts0.35 −51%, better
Vas16.2 L +16%, worse
BL6.8 T·m +5%
Xmax3 mm –
Sensitivity87.1 dB −1.6
Scanspeak18M/4631T00
£192.54 · Same priceFs65 Hz –
Qts0.60 −15%, better
Vas14 L –
BL5.6 T·m −14%, worse
Xmax3 mm –
Sensitivity89.6 dB +0.9
Supravox165-2000 MK2
£197.35 · 2% moreFs77 Hz +18%, worse
Qts0.70 –
Vas25.8 L +84%, worse
BL3.5 T·m −46%, worse
Xmax2.9 mm −3%
Sensitivity93.7 dB +5, better
PRV Audio8MR400B-4
No current priceFs93 Hz +43%, worse
Qts0.74 +4%
Vas15.7 L +12%, worse
BL6.3 T·m –
Xmax3.3 mm +8%
Sensitivity94.2 dB +5.5, better
PRV Audio69FR250-4
No current priceFs82 Hz +26%, worse
Qts0.70 –
Vas13.9 L –
BL6.1 T·m −6%
Xmax3.5 mm +17%, better
Sensitivity92.2 dB +3.5, better
No photo
LavoceCSF061.21
No current priceFs90 Hz +38%, worse
Qts0.67 −6%
Vas8.5 L −39%, better
BL6.1 T·m −6%
Xmax3.2 mm +7%
Sensitivity91 dB +2.3, better
PRV Audio8MR450CF-4
No current priceFs83 Hz +27%, worse
Qts0.71 –
Vas17.5 L +25%, worse
BL6.1 T·m −7%
Xmax3.5 mm +17%, better
Sensitivity93.4 dB +4.7, better
Lii AudioST-5
No current priceFs56 Hz −14%, better
Qts0.66 −7%
Vas14.3 L –
BL5.8 T·m −10%, worse
Xmax4 mm +33%, better
Sensitivity86.7 dB −2, worse
CelestionFTX0617
No current priceFs100 Hz +54%, worse
Qts0.74 +4%
Vas7.4 L −47%, better
BL6.6 T·m –
Xmax3.5 mm +17%, better
Sensitivity91 dB +2.3, better
PRV Audio6MR400CF-4
No current priceFs131 Hz +102%, worse
Qts0.76 +7%
Vas4.1 L −71%, better
BL6.3 T·m –
Xmax3.5 mm +17%, better
Sensitivity92.8 dB +4.1, better
Tang BandW8-2282
No current priceFs35 Hz −46%, better
Qts0.66 −7%
Vas12.9 L −8%
BL10.8 T·m +66%, better
Xmax5 mm +67%, better
Sensitivity80.7 dB −8, worse
MonacorSP-202PA
No current priceFs68 Hz +5%
Qts1.10 +55%, worse
Vas12 L −14%, better
BL5.6 T·m −14%, worse
Xmax3 mm –
Sensitivity84.3 dB −4.4, worse
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- SoundImports5.0 out of 53 ratings · Checked 25 Oct 2026Read reviews on SoundImports
Each shop collects its own ratings. Bits shows them as published and doesn't verify them.
| 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 | 16 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