GRS4SMP-8
£11.96 · 11% less, betterFs63 Hz −16%, better
Qts0.65 +14%, worse
Vas4 L −11%, better
BL4.2 T·m –
Xmax4 mm +167%, better
Sensitivity82.8 dB −2.9, worse
4-inch LF driver · SPM series · 21 mm voice coil · 40 W
Monacor SPM-116/8 8Ω
8 Ω · 3–18000 Hz
- Fs
- 75Hz
- Xmax
- 1.5mm
- SPL
- 86dB
- Pe
- 40W
- BL
- 4.2T·m
- Vd
- 9cm³
- Qts
- 0.57
- Vas
- 5L
Monacor SPM-116/8 is a 4-inch 8 ohm LF driver rated at 40 W RMS. The validated T/S data includes Fs 75 Hz, Qts 0.57, Vas 4.5 L, Xmax 1.5 mm, sensitivity 85.7 dB, plus 9 cm³ Vd and 93 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 £13.40.
The published T/S values agree with each other
Thiele/Small
- Fs
- 75Hz
- Qts
- 0.57
- Qes
- 0.81
- Qms
- 1.9
- Vas
- 4.5L
- Re
- 7.2Ω
- Le
- 0.40mH
Motor and cone
- BL
- 4.2T·m
- Sd
- 57cm²
- Mms
- 4g
- Xmax
- 1.5mm
- Vd †
- 9cm³
- Voice coil
- 21mm
Power and response
- Sensitivity †
- 85.7dB
- Manufacturer sensitivity
- 87dB
- Power
- 40W
- Impedance
- 8Ω
- Range
- 3–18000Hz
- EBP †
- 93 · Sealed or vented
Size and mounting
- Diameter
- 115mm
- Cutout
- 94mm
- Depth
- 60mm
- Weight
- 0.56kg
Other published values
- Cms
- 0.98mm/N
- Power Peak
- 80
Other dimensions
- Mounting Depth
- 53
Sensitivity shows 85.7 dB, calculated from the T/S values. Monacor publishes 87.0 dB, 1.3 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else Monacor lists
MF · Primary · 4″
- BL
- 4.2T·m
- Fs
- 75Hz
- Le
- 0.40mH
- Re
- 7.2Ω
- Sd
- 57cm²
- Cms
- 0.98mm/N
- Mms
- 4g
- Qes
- 0.81
- Qms
- 1.9
- Qts
- 0.57
- SPL
- 85.7dB
- Vas
- 4.5L
- Xmax
- 1.5mm
- Power
- 40W
- Impedance
- 8Ω
- Power Peak
- 80
- Sensitivity
- 87dB
- Low limit
- 3Hz
- Calculated sensitivity †
- 85.7dB
- High limit
- 18000Hz
- Manufacturer sensitivity
- 87dB
- Voice coil
- 21mm
- Weight
- 0.56kg
- Diameter
- 115mm
- Depth
- 60mm
- Mounting Depth
- 53
- Cutout
- 94mm
02
Compare
Same-size drivers, compared with the SPM-116/8. Clear differences are green when better and red when worse.
This driverSPM-116/8
Best price
£13.40
Fs
75 Hz
Qts
0.57
Vas
4.5 L
BL
4.2 T·m
Xmax
1.5 mm
Sensitivity
85.7 dB
Power
40 W
MonacorSPM-100/8
£13.40 · Same priceFs75 Hz –
Qts0.67 +18%, worse
Vas4 L −11%, better
BL4.1 T·m –
Xmax1 mm −33%, worse
Sensitivity84.3 dB −1.4
VisatonFR 10
£13.48 · Same priceFs90 Hz +20%, worse
Qts0.67 +18%, worse
Vas2.3 L −49%, better
BL4.6 T·m +10%
Xmax1.5 mm –
Sensitivity84.5 dB −1.2
VisatonSL 87 FE
£15.07 · 13% more, worseFs120 Hz +60%, worse
Qts0.65 +14%, worse
Vas1.5 L −66%, better
BL4.0 T·m −6%
Xmax1.8 mm +17%, better
Sensitivity87.1 dB +1.4
Sica3.5 F 1 CS
£16.66 · 24% more, worseFs107 Hz +43%, worse
Qts0.57 –
Vas1.4 L −69%, better
BL4.2 T·m –
Xmax1.5 mm –
Sensitivity86.4 dB +0.7
Dayton AudioPC105-8
£16.70 · 25% more, worseFs85 Hz +13%, worse
Qts0.64 +12%, worse
Vas3.4 L −24%, better
BL4.1 T·m –
Xmax2 mm +33%, better
Sensitivity85.7 dB –
FaitalPRO4FE32
£21.94 · 64% more, worseFs100 Hz +33%, worse
Qts0.53 −7%
Vas2.5 L −44%, better
BL3.7 T·m −12%, worse
Xmax1.7 mm +15%, better
Sensitivity88.1 dB +2.4, better
SB AcousticsSB12PFC25-8
£21.98 · 64% more, worseFs64 Hz −15%, better
Qts0.56 –
Vas4.3 L −4%
BL4.5 T·m +7%
Xmax5 mm +233%, better
Sensitivity84.4 dB −1.3
Dayton AudioDMA105-8
£22.10 · 65% more, worseFs72 Hz −4%
Qts0.63 +11%, worse
Vas4.2 L −6%
BL4.5 T·m +7%
Xmax2.5 mm +67%, better
Sensitivity84.8 dB −0.9
Sica3.5 L 1 SL
£23.36 · 74% more, worseFs108 Hz +44%, worse
Qts0.57 –
Vas1.4 L −69%, better
BL4.3 T·m –
Xmax1.5 mm –
Sensitivity86.6 dB +0.9
CIAREHW129
£23.44 · 75% more, worseFs75 Hz –
Qts0.55 −4%
Vas6.1 L +36%, worse
BL5.2 T·m +24%, better
Xmax3.9 mm +160%, better
Sensitivity87.3 dB +1.6
VisatonW 100 S
£26.13 · 95% more, worseFs63 Hz −16%, better
Qts0.54 −5%
Vas5.4 L +20%, worse
BL4.3 T·m –
Xmax2 mm +33%, better
Sensitivity85.1 dB −0.6
Dayton AudioRS100-8
£29.91 · 123% more, worseFs92 Hz +23%, worse
Qts0.58 –
Vas1.4 L −68%, better
BL4.2 T·m –
Xmax3.5 mm +133%, better
Sensitivity83.7 dB −2, worse
Dayton AudioRS100P-8
£29.91 · 123% more, worseFs96 Hz +27%, worse
Qts0.54 −5%
Vas1.8 L −60%, better
BL4.0 T·m −6%
Xmax3.7 mm +147%, better
Sensitivity85.5 dB –
Dayton AudioDMA105-4
£30.10 · 125% more, worseFs73 Hz −3%
Qts0.51 −11%, better
Vas4.2 L −6%
BL3.4 T·m −19%, worse
Xmax2.5 mm +67%, better
Sensitivity86.2 dB +0.5
CIAREPA100
£30.98 · 131% more, worseFs100 Hz +33%, worse
Qts0.59 +4%
Vas2.5 L −44%, better
BL4.4 T·m +5%
Xmax2.5 mm +67%, better
Sensitivity87.6 dB +1.9
VisatonB 100
£73.93 · 452% more, worseFs75 Hz –
Qts0.52 −9%
Vas5.3 L +17%, worse
BL4.1 T·m –
Xmax1.6 mm +10%
Sensitivity88.2 dB +2.5, better
SEASH1304-08 MCA12RC
£76.51 · 471% more, worseFs68 Hz −9%
Qts0.56 –
Vas5 L +11%, worse
BL4.2 T·m –
Xmax0.9 mm −40%, worse
Sensitivity85.3 dB –
VisatonHX 10
£99.54 · 643% more, worseFs80 Hz +7%
Qts0.50 −12%, better
Vas5.1 L +13%, worse
BL3.9 T·m −7%
Xmax1.5 mm –
Sensitivity88.3 dB +2.6, better
WavecorMR120BD03
No current priceFs73 Hz –
Qts0.56 –
Vas3.1 L −31%, better
BL5.2 T·m +24%, better
Xmax1.5 mm –
Sensitivity85.1 dB −0.6
WavecorMR120BD04
No current priceFs72 Hz −4%
Qts0.55 −4%
Vas3.2 L −29%, better
BL5.2 T·m +24%, better
Xmax1.5 mm –
Sensitivity85.1 dB −0.6
Dayton AudioCFC120-8
No current priceFs60 Hz −20%, better
Qts0.56 –
Vas4.6 L –
BL5.1 T·m +22%, better
Xmax2.5 mm +67%, better
Sensitivity83.6 dB −2.1, worse
WavecorWF118OM02
No current priceFs61 Hz −19%, better
Qts0.65 +14%, worse
Vas5.5 L +22%, worse
BL4.2 T·m –
Xmax1.9 mm +27%, better
Sensitivity84.5 dB −1.2
KartesianWIB120_VHE
No current priceFs68 Hz −9%
Qts0.56 –
Vas4.4 L –
BL4.0 T·m −5%
Xmax4 mm +167%, better
Sensitivity86 dB –
WavecorMR120BD01
No current priceFs72 Hz −4%
Qts0.45 −21%, better
Vas3.1 L −31%, better
BL4.2 T·m –
Xmax1.5 mm –
Sensitivity85.9 dB –
WavecorMR120BD02
No current priceFs70 Hz −7%
Qts0.44 −23%, better
Vas3.2 L −29%, better
BL4.2 T·m –
Xmax1.5 mm –
Sensitivity85.8 dB –
CIARECM132
No current priceFs115 Hz +53%, worse
Qts0.43 −25%, better
Vas3.8 L −16%, better
BL4.4 T·m +5%
Xmax1.6 mm +7%
Sensitivity92.2 dB +6.5, better
CIARECM087
No current priceFs122 Hz +63%, worse
Qts0.64 +12%, worse
Vas1.2 L −73%, better
BL2.9 T·m −32%, worse
Xmax1.5 mm –
Sensitivity86.4 dB +0.7
HiViB4N
No current priceFs56 Hz −25%, better
Qts0.52 −9%
Vas4.5 L –
BL5.1 T·m +21%, better
Xmax3.2 mm +113%, better
Sensitivity83 dB −2.7, worse
Dayton AudioDMA90-8
No current priceFs94 Hz +26%, worse
Qts0.57 –
Vas1.7 L −62%, better
BL4.7 T·m +12%, better
Xmax2.5 mm +67%, better
Sensitivity84.9 dB −0.8
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 52 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 |
|---|---|---|---|---|
LTT Import VAT and duty may apply | £13.40, the lowest price | Stock not listed | Visit shop at LTT | |
Audiophonics Import VAT and duty may apply | £16.66 | 24% above the lowest price | In stock | Visit shop at Audiophonics |
SoundImports Import VAT and duty may apply | £17.96 | 34% above the lowest price | 1 in stock | Visit shop at SoundImports |
Best price over time
Tracked since 1 Apr