GRS10S-8
£7.47 · 36% less, betterFs151 Hz +10%, worse
Qts1.65 −15%, better
Vas1.8 L +49%, worse
BL2.8 T·m −10%
Xmax1.5 mm –
Sensitivity86.7 dB +3.7, better
4-inch LF driver · 1 mm voice coil · 40 W
GRS 4PF-8 8Ω
8 Ω · 100–10000 Hz
£11.68
SteadySoundImports · 1 in stock · Ships from Netherlands · All 1 offer
- Fs
- 137Hz
- Xmax
- 1.5mm
- SPL
- 83dB
- Pe
- 40W
- BL
- 3.1T·m
- Vd
- 8cm³
- Qts
- 1.94
- Vas
- 1L
GRS 4PF-8 is a 4-inch 8 ohm LF driver rated at 40 W RMS. The validated T/S data includes Fs 137 Hz, Qts 1.94, Vas 1.2 L, Xmax 1.5 mm, sensitivity 83 dB, plus 8 cm³ Vd. bits tracks UK, EU and US shop prices, price movement, datasheet links, simulator import data, and similar drivers, with a current best price of £11.68.
Partial source evidence
Automated T/S checks passed, but some material low-frequency parameters are not published for this record.
Material fields not published: Qes, Mms
- Manufacturer page linked
- Datasheet linked
- Canonical units normalized for comparison
- Vd can be derived from Sd and Xmax
Thiele/Small
- Fs
- 137Hz
- Qts
- 1.94
- Qms
- 5.8
- Vas
- 1.2L
- Re
- 6.8Ω
- Le
- 0.50mH
Motor and cone
- BL
- 3.1T·m
- Sd
- 55cm²
- Xmax
- 1.5mm
- Vd †
- 8cm³
- Voice coil
- 1mm
Power and response
- Sensitivity
- 83dB
- Power
- 40W
- Impedance
- 8Ω
- Range
- 100–10000Hz
Size and mounting
- Diameter
- 114mm
- Cutout
- 94mm
- Bolt circle
- 105mm
- Depth
- 54mm
Other published values
- Cms
- 0.28mm/N
- Power Peak
- 70
† Calculated by bits from the published values
What this validation status means
Everything else GRS lists
LF · Primary · 4″
- BL
- 3.1T·m
- Fs
- 137Hz
- Le
- 0.50mH
- Re
- 6.8Ω
- Sd
- 55cm²
- Cms
- 0.28mm/N
- Qms
- 5.8
- Qts
- 1.94
- SPL
- 83dB
- Vas
- 1.2L
- Xmax
- 1.5mm
- Power
- 40W
- Impedance
- 8Ω
- Power Peak
- 70
- Sensitivity
- 83dB
- Low limit
- 100Hz
- High limit
- 10000Hz
- Manufacturer sensitivity
- 83dB
- Voice coil
- 1mm
- Diameter
- 114mm
- Depth
- 54mm
- Cutout
- 94mm
- Bolt circle
- 105mm
02
Compare
Same-size drivers, compared with the 4PF-8. Clear differences are green when better and red when worse.
This driver4PF-8
Best price
£11.68
Fs
137 Hz
Qts
1.94
Vas
1.2 L
BL
3.1 T·m
Xmax
1.5 mm
Sensitivity
83 dB
Power
40 W
VisatonFR 10 HM
£8.33 · 29% less, betterFs120 Hz −12%, better
Qts1.44 −26%, better
Vas2 L +67%, worse
BL2.9 T·m −6%
Xmax1.5 mm –
Sensitivity84.6 dB +1.6
FaitalPRO3FE25
£8.68 · 26% less, betterFs110 Hz −20%, better
Qts0.66 −66%, better
Vas1.3 L +8%
BL3.6 T·m +16%, better
Xmax1.8 mm +22%, better
Sensitivity85.4 dB +2.4, better
PeerlessTC9FD18-08
£9.54 · 18% less, betterFs130 Hz −5%
Qts0.97 −50%, better
Vas1.0 L −19%, better
BL3.1 T·m –
Xmax3.9 mm +159%, better
Sensitivity83.8 dB +0.8
LavoceFSF030.70
£10.04 · 14% less, betterFs123 Hz −10%, better
Qts0.77 −60%, better
Vas1.2 L –
BL3.5 T·m +12%, better
Xmax2.1 mm +40%, better
Sensitivity85.9 dB +2.9, better
VisatonFRS 8
£12.94 · 11% more, worseFs120 Hz −12%, better
Qts1.04 −46%, better
Vas0.9 L −25%, better
BL3.2 T·m +3%
Xmax0.25 mm −83%, worse
Sensitivity82.7 dB –
REDCATT31NFR
£15.45 · 32% more, worseFs115 Hz −16%, better
Qts0.88 −55%, better
Vas0.85 L −29%, better
BL3.5 T·m +13%, better
Xmax1.7 mm +13%, better
Sensitivity83.4 dB –
Sica4 D 0.8 CS
£15.91 · 36% more, worseFs140 Hz –
Qts0.92 −53%, better
Vas1.2 L –
BL2.6 T·m −15%, worse
Xmax1.3 mm −13%, worse
Sensitivity86.5 dB +3.5, better
Sica3.5 F 1 CS
£16.66 · 43% more, worseFs107 Hz −22%, better
Qts0.57 −71%, better
Vas1.4 L +17%, worse
BL4.2 T·m +35%, better
Xmax1.5 mm –
Sensitivity86.4 dB +3.4, better
MonacorSPX-31M
£19.26 · 65% more, worseFs110 Hz −20%, better
Qts0.58 −70%, better
Vas1.3 L +8%
BL3.6 T·m +17%, better
Xmax1.1 mm −27%, worse
Sensitivity86 dB +3, better
Sica3.5 L 1 SL
£23.36 · 100% more, worseFs108 Hz −21%, better
Qts0.57 −71%, better
Vas1.4 L +17%, worse
BL4.3 T·m +38%, better
Xmax1.5 mm –
Sensitivity86.6 dB +3.6, better
Dayton AudioND90-4
£25.04 · 114% more, worseFs90 Hz −34%, better
Qts0.63 −68%, better
Vas1.1 L −12%, better
BL3.5 T·m +12%, better
Xmax4 mm +167%, better
Sensitivity82.4 dB −0.6
Sica3 L 0.8 SL
£26.75 · 129% more, worseFs145 Hz +6%
Qts1.01 −48%, better
Vas0.8 L −33%, better
BL2.8 T·m −10%
Xmax1.5 mm –
Sensitivity84.8 dB +1.8
Dayton AudioRS100-4
£29.91 · 156% more, worseFs85 Hz −38%, better
Qts0.53 −73%, better
Vas1.4 L +21%, worse
BL3.2 T·m –
Xmax4 mm +167%, better
Sensitivity83.3 dB –
FaitalPRO4FE44
£33.32 · 185% more, worseFs150 Hz +9%
Qts0.33 −83%, better
Vas1.1 L −8%
BL7.2 T·m +132%, better
Xmax1.7 mm +11%, better
Sensitivity92.3 dB +9.3, better
PRV Audio3MR40-NDY-4
£36.80 · 215% more, worseFs153 Hz +12%, worse
Qts0.77 −60%, better
Vas0.6 L −48%, better
BL2.9 T·m −5%
Xmax1.4 mm −7%
Sensitivity85.6 dB +2.6, better
WavecorWF090WA01
£41.14 · 252% more, worseFs115 Hz −16%, better
Qts0.81 −58%, better
Vas1.0 L −15%, better
BL2.9 T·m −6%
Xmax2.8 mm +83%, better
Sensitivity84.3 dB +1.3
WavecorWF095WA01
£41.14 · 252% more, worseFs89 Hz −35%, better
Qts0.64 −67%, better
Vas1.5 L +25%, worse
BL3 T·m −3%
Xmax2.7 mm +80%, better
Sensitivity83.8 dB +0.8
PRV Audio4MR60-NDY-4
£41.82 · 258% more, worseFs96 Hz −30%, better
Qts0.85 −56%, better
Vas2.9 L +138%, worse
BL2.8 T·m −9%
Xmax1.4 mm −7%
Sensitivity85.8 dB +2.8, better
WavecorWF090WA02
£57.10 · 389% more, worseFs109 Hz −20%, better
Qts0.76 −61%, better
Vas1.1 L −5%
BL3.5 T·m +13%, better
Xmax2.8 mm +83%, better
Sensitivity84.3 dB +1.3
WavecorFR090WA02
£61.12 · 423% more, worseFs109 Hz −20%, better
Qts0.85 −56%, better
Vas1.1 L −5%
BL3.4 T·m +10%
Xmax2.3 mm +50%, better
Sensitivity83.7 dB +0.7
WavecorFR090WA01
£61.12 · 423% more, worseFs113 Hz −18%, better
Qts0.88 −55%, better
Vas1.1 L −11%, better
BL2.8 T·m −11%, worse
Xmax2.3 mm +50%, better
Sensitivity83.8 dB +0.8
WavecorFR084WA01
£61.71 · 428% more, worseFs113 Hz −18%, better
Qts0.82 −58%, better
Vas1.1 L −11%, better
BL2.9 T·m −6%
Xmax2 mm +33%, better
Sensitivity84.1 dB +1.1
£73.62 · 530% more, worse
Fs100 Hz −27%, better
Qts0.67 −65%, better
Vas1.1 L −8%
BL2.9 T·m −6%
Xmax2 mm +33%, better
Sensitivity81.8 dB −1.2
CIARECM087
No current priceFs122 Hz −11%, better
Qts0.64 −67%, better
Vas1.2 L –
BL2.9 T·m −8%
Xmax1.5 mm –
Sensitivity86.4 dB +3.4, better
Dayton AudioCE78PF-4
No current priceFs100 Hz −27%, better
Qts0.99 −49%, better
Vas1.1 L −5%
BL2.2 T·m −28%, worse
Xmax1.4 mm −7%
Sensitivity81.3 dB −1.7
WavecorFR084OM02
No current priceFs117 Hz −15%, better
Qts1.06 −45%, better
Vas1.1 L −10%
BL3.4 T·m +10%
Xmax2.3 mm +50%, better
Sensitivity83.6 dB +0.6
CIARECXE874
No current priceFs145 Hz +6%
Qts1.23 −37%, better
Vas0.6 L −50%, better
BL2.7 T·m −14%, worse
Xmax1.6 mm +7%
Sensitivity82.7 dB –
WavecorFR084OM01
No current priceFs115 Hz −16%, better
Qts0.92 −53%, better
Vas1.1 L −10%
BL2.8 T·m −11%, worse
Xmax2.3 mm +50%, better
Sensitivity84.1 dB +1.1
HiViM3N
No current priceFs91 Hz −34%, better
Qts0.80 −59%, better
Vas1.5 L +25%, worse
BL3 T·m −3%
Xmax3 mm +100%, better
Sensitivity82.4 dB −0.6
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- SoundImports4.7 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 |
|---|---|---|---|---|
SoundImports Import VAT and duty may apply | £11.68, the lowest price | 1 in stock | Visit shop at SoundImports |
Best price over time
Tracked since 1 Apr