REDCATT4FR-1
£11.96 · 35% less, betterFs79 Hz −28%, better
Qts0.52 −7%
Vas1.8 L +12%, worse
BL4.8 T·m +30%, better
Xmax2.8 mm +155%, better
Sensitivity83.7 dB −3.8, worse
3-inch LF driver · SPX series · 20 mm voice coil · 20 W
Monacor SPX-32M 8Ω
8 Ω · 3–22000 Hz
- Fs
- 110Hz
- Xmax
- 1.1mm
- SPL
- 88dB
- Pe
- 20W
- BL
- 3.7T·m
- Vd
- 4cm³
- Qts
- 0.56
- Vas
- 2L
Monacor SPX-32M is a 3-inch 8 ohm LF driver rated at 20 W RMS. The validated T/S data includes Fs 110 Hz, Qts 0.56, Vas 1.6 L, Xmax 1.1 mm, sensitivity 87.5 dB, plus 4 cm³ Vd and 183 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 £18.42.
The published T/S values agree with each other
Thiele/Small
- Fs
- 110Hz
- Qts
- 0.56
- Qes
- 0.60
- Qms
- 7.7
- Vas
- 1.6L
- Re
- 6.6Ω
- Le
- 0.18mH
Motor and cone
- BL
- 3.7T·m
- Sd
- 32cm²
- Mms
- 2g
- Xmax
- 1.1mm
- Vd †
- 4cm³
- Voice coil
- 20mm
Power and response
- Sensitivity †
- 87.5dB
- Manufacturer sensitivity
- 88dB
- Power
- 20W
- Impedance
- 8Ω
- Range
- 3–22000Hz
- EBP †
- 183 · Leans vented
Size and mounting
- Diameter
- 93mm
- Cutout
- 71mm
- Depth
- 55mm
- Weight
- 0.5kg
Other published values
- Cms
- 1.11mm/N
- Power Peak
- 40
Other dimensions
- Mounting Depth
- 52.5
† Calculated by bits from the published values
What this validation status means
Everything else Monacor lists
LF · Primary · 3″
- BL
- 3.7T·m
- Fs
- 110Hz
- Le
- 0.18mH
- Re
- 6.6Ω
- Sd
- 32cm²
- Cms
- 1.11mm/N
- Mms
- 2g
- Qes
- 0.60
- Qms
- 7.7
- Qts
- 0.56
- SPL
- 87.5dB
- Vas
- 1.6L
- Xmax
- 1.1mm
- Power
- 20W
- Impedance
- 8Ω
- Power Peak
- 40
- Sensitivity
- 88dB
- Low limit
- 3Hz
- Calculated sensitivity †
- 87.5dB
- High limit
- 22000Hz
- Manufacturer sensitivity
- 88dB
- Voice coil
- 20mm
- Weight
- 0.5kg
- Diameter
- 93mm
- Depth
- 55mm
- Mounting Depth
- 52.5
- Cutout
- 71mm
02
Compare
Same-size drivers, compared with the SPX-32M. Clear differences are green when better and red when worse.
This driverSPX-32M
Best price
£18.42
Fs
110 Hz
Qts
0.56
Vas
1.6 L
BL
3.7 T·m
Xmax
1.1 mm
Sensitivity
87.5 dB
Power
20 W
VisatonFRS 8 M
£12.94 · 30% less, betterFs125 Hz +14%, worse
Qts0.49 −13%, better
Vas1.1 L −31%, better
BL4 T·m +8%
Xmax0.25 mm −77%, worse
Sensitivity87.7 dB –
Dayton AudioPC83-4
£13.10 · 29% less, betterFs80 Hz −27%, better
Qts0.54 −4%
Vas2.0 L +24%, worse
BL2.9 T·m −21%, worse
Xmax2 mm +82%, better
Sensitivity84 dB −3.5, worse
Dayton AudioPC83-8
£13.10 · 29% less, betterFs82 Hz −25%, better
Qts0.63 +12%, worse
Vas1.7 L +6%
BL3.5 T·m −5%
Xmax2 mm +82%, better
Sensitivity83 dB −4.5, worse
Sica3.5 F 1 CS
£16.66 · 10% less, betterFs107 Hz –
Qts0.57 –
Vas1.4 L −13%, better
BL4.2 T·m +14%, better
Xmax1.5 mm +36%, better
Sensitivity86.4 dB −1.1
Sica3.5 H 1 CS
£18.42 · Same priceFs85 Hz −23%, better
Qts0.53 −5%
Vas1.8 L +12%, worse
BL4.8 T·m +31%, better
Xmax2.5 mm +127%, better
Sensitivity84.9 dB −2.6, worse
MonacorSPX-31M
£19.26 · 5% moreFs110 Hz –
Qts0.58 +4%
Vas1.3 L −19%, better
BL3.6 T·m –
Xmax1.1 mm –
Sensitivity86 dB −1.5
Sica3.5 L 1 SL
£23.36 · 27% more, worseFs108 Hz –
Qts0.57 –
Vas1.4 L −13%, better
BL4.3 T·m +16%, better
Xmax1.5 mm +36%, better
Sensitivity86.6 dB −0.9
Tang BandW3-871B
£27.63 · 50% more, worseFs110 Hz –
Qts0.52 −7%
Vas1.2 L −26%, better
BL3.7 T·m –
Xmax0.5 mm −55%, worse
Sensitivity86.1 dB −1.4
Dayton AudioRS100-4
£29.91 · 62% more, worseFs85 Hz −23%, better
Qts0.53 −5%
Vas1.4 L −9%
BL3.2 T·m −14%, worse
Xmax4 mm +264%, better
Sensitivity83.3 dB −4.2, worse
Dayton AudioRS100P-8
£29.91 · 62% more, worseFs96 Hz −13%, better
Qts0.54 −4%
Vas1.8 L +14%, worse
BL4.0 T·m +7%
Xmax3.7 mm +236%, better
Sensitivity85.5 dB −2, worse
Dayton AudioRS100P-4
£29.91 · 62% more, worseFs85 Hz −23%, better
Qts0.54 −4%
Vas1.9 L +16%, worse
BL3.0 T·m −20%, worse
Xmax4 mm +264%, better
Sensitivity84.3 dB −3.2, worse
Dayton AudioRS100-8
£29.91 · 62% more, worseFs92 Hz −16%, better
Qts0.58 +4%
Vas1.4 L −11%, better
BL4.2 T·m +14%, better
Xmax3.5 mm +218%, better
Sensitivity83.7 dB −3.8, worse
Tang BandW3-881SJ
£30.14 · 64% more, worseFs100 Hz −9%
Qts0.58 +4%
Vas2.3 L +44%, worse
BL3.3 T·m −10%, worse
Xmax0.2 mm −82%, worse
Sensitivity87.7 dB –
Tang BandW3-871SC
£30.90 · 68% more, worseFs110 Hz –
Qts0.59 +5%
Vas1.6 L +3%
BL3.5 T·m −5%
Xmax0.5 mm −55%, worse
Sensitivity86.9 dB −0.6
Tang BandW3-315E
£32.19 · 75% more, worseFs100 Hz −9%
Qts0.52 −7%
Vas1.7 L +5%
BL3.9 T·m +5%
Xmax1.3 mm +14%, better
Sensitivity86.7 dB −0.8
WavecorWF095WA02
£41.14 · 123% more, worseFs86 Hz −22%, better
Qts0.62 +11%, worse
Vas1.6 L –
BL3.6 T·m –
Xmax2.7 mm +145%, better
Sensitivity83.7 dB −3.8, worse
Scanspeak10F/8414G10
£66.31 · 260% more, worseFs100 Hz −9%
Qts0.51 −9%
Vas1.6 L –
BL4.3 T·m +17%, better
Xmax2.3 mm +109%, better
Sensitivity85.9 dB −1.6
VisatonB 80
£72.39 · 293% more, worseFs110 Hz –
Qts0.63 +12%, worse
Vas1.8 L +12%, worse
BL4.2 T·m +12%, better
Xmax2.2 mm +100%, better
Sensitivity87.4 dB –
WavecorFR070WA02
£81.22 · 341% more, worseFs114 Hz +4%
Qts0.53 −5%
Vas0.6 L −62%, better
BL3.6 T·m –
Xmax2 mm +82%, better
Sensitivity84.2 dB −3.3, worse
Tang BandW3-1053SC
No current priceFs100 Hz −9%
Qts0.52 −7%
Vas1.8 L +11%, worse
BL3.7 T·m –
Xmax0.75 mm −32%, worse
Sensitivity87 dB −0.5
Tang BandW3-1319SA
No current priceFs110 Hz –
Qts0.55 –
Vas1.8 L +11%, worse
BL3.5 T·m −4%
Xmax0.5 mm −55%, worse
Sensitivity87.4 dB –
MonacorSP-45/8
No current priceFs120 Hz +9%
Qts0.55 –
Vas1.5 L −6%
BL3.4 T·m −8%
Xmax0.75 mm −32%, worse
Sensitivity87.8 dB –
Tang BandW3-582A
No current priceFs100 Hz −9%
Qts0.60 +7%
Vas1.8 L +11%, worse
BL3.6 T·m −4%
Xmax0.25 mm −77%, worse
Sensitivity86.2 dB −1.3
Tang BandW3-532SQ
No current priceFs100 Hz −9%
Qts0.61 +9%
Vas1.7 L +5%
BL3.5 T·m −4%
Xmax0.2 mm −82%, worse
Sensitivity85.9 dB −1.6
Tang BandW3-926SDF
No current priceFs100 Hz −9%
Qts0.49 −13%, better
Vas1.9 L +18%, worse
BL3.7 T·m –
Xmax0.75 mm −32%, worse
Sensitivity87.5 dB –
WavecorSW084OM02
No current priceFs77 Hz −30%, better
Qts0.53 −5%
Vas1.7 L +6%
BL4.6 T·m +24%, better
Xmax4.5 mm +309%, better
Sensitivity83.4 dB −4.1, worse
Tang BandW3-316B
No current priceFs100 Hz −9%
Qts0.44 −21%, better
Vas1.9 L +18%, worse
BL4.1 T·m +12%, better
Xmax1.2 mm +9%
Sensitivity88 dB +0.5
EminenceALPHA 4-4
No current priceFs120 Hz +9%
Qts0.63 +12%, worse
Vas1.8 L +10%
BL4.1 T·m +12%, better
Xmax2.6 mm +136%, better
Sensitivity88.4 dB +0.9
MorelINTEGRA 424
No current priceFs120 Hz +9%
Qts0.48 −14%, better
Vas2 L +25%, worse
BL4.3 T·m +17%, better
Xmax3 mm +173%, better
Sensitivity89.6 dB +2.1, better
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- SoundImports4.5 out of 54 ratings · Checked 26 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 | £18.42, the lowest price | Stock not listed | Visit shop at LTT | |
Audiophonics Import VAT and duty may apply | £22.52 | 22% above the lowest price | In stock | Visit shop at Audiophonics |
SoundImports Import VAT and duty may apply | £22.98 | 25% above the lowest price | 1 in stock | Visit shop at SoundImports |
Best price over time
Tracked since 1 Apr