Dayton AudioCE41N-4
£7.08 · 69% less, betterFs170 Hz –
Qts0.53 +13%, worse
Vas0.078 L −22%, better
BL2.3 T·m −31%, worse
Xmax0.7 mm −42%, worse
Sensitivity80.2 dB −1.5
2-inch LF driver · SPX series · 20 mm voice coil · 12 W
Monacor SPX-21M 4Ω
4 Ω · 3–22000 Hz
£22.52
18%LTT · Ships from Germany · All 3 offers
- Fs
- 170Hz
- Xmax
- 1.2mm
- SPL
- 82dB
- Pe
- 12W
- BL
- 3.3T·m
- Vd
- 2cm³
- Qts
- 0.47
- Vas
- 0.1L
Monacor SPX-21M is a 2-inch 4 ohm LF driver rated at 12 W RMS. The validated T/S data includes Fs 170 Hz, Qts 0.47, Vas 0.1 L, Xmax 1.2 mm, sensitivity 81.7 dB, plus 2 cm³ Vd and 321 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 £22.52.
The published T/S values agree with each other
Thiele/Small
- Fs
- 170Hz
- Qts
- 0.47
- Qes
- 0.53
- Qms
- 4.7
- Vas
- 0.1L
- Re
- 3.7Ω
- Le
- 0.12mH
Motor and cone
- BL
- 3.3T·m
- Sd
- 13cm²
- Mms
- 1g
- Xmax
- 1.2mm
- Vd †
- 2cm³
- Voice coil
- 20mm
Power and response
- Sensitivity †
- 81.7dB
- Manufacturer sensitivity
- 84dB
- Power
- 12W
- Impedance
- 4Ω
- Range
- 3–22000Hz
- EBP †
- 321 · Leans vented
Size and mounting
- Diameter
- 55.5mm
- Cutout
- 50.5mm
- Depth
- 34mm
- Weight
- 90kg
Other published values
- Cms
- 0.60mm/N
- Power Peak
- 25
Other dimensions
- Mounting Depth
- 33.4
Sensitivity shows 81.7 dB, calculated from the T/S values. Monacor publishes 84.0 dB, 2.3 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else Monacor lists
LF · Primary · 2″
- BL
- 3.3T·m
- Fs
- 170Hz
- Le
- 0.12mH
- Re
- 3.7Ω
- Sd
- 13cm²
- Cms
- 0.60mm/N
- Mms
- 1g
- Qes
- 0.53
- Qms
- 4.7
- Qts
- 0.47
- SPL
- 81.7dB
- Vas
- 0.1L
- Xmax
- 1.2mm
- Power
- 12W
- Impedance
- 4Ω
- Power Peak
- 25
- Sensitivity
- 84dB
- Low limit
- 3Hz
- Calculated sensitivity †
- 81.7dB
- High limit
- 22000Hz
- Manufacturer sensitivity
- 84dB
- Voice coil
- 20mm
- Weight
- 90kg
- Diameter
- 55.5mm
- Depth
- 34mm
- Mounting Depth
- 33.4
- Cutout
- 50.5mm
02
Compare
Same-size drivers, compared with the SPX-21M. Clear differences are green when better and red when worse.
This driverSPX-21M
Best price
£22.52
Fs
170 Hz
Qts
0.47
Vas
0.1 L
BL
3.3 T·m
Xmax
1.2 mm
Sensitivity
81.7 dB
Power
12 W
REDCATT20NFR
£9.96 · 56% less, betterFs185 Hz +9%
Qts0.52 +11%, worse
Vas0.09 L −10%, better
BL3.2 T·m –
Xmax3 mm +150%, better
Sensitivity82.3 dB +0.6
FaitalPRO3FE25
£12.00 · 47% less, betterFs110 Hz −35%, better
Qts0.52 +11%, worse
Vas1.3 L +1200%, worse
BL3 T·m −10%
Xmax1.7 mm +44%, better
Sensitivity86.6 dB +4.9, better
Dayton AudioDMA58-4
£16.70 · 26% less, betterFs166 Hz –
Qts0.46 –
Vas0.14 L +42%, worse
BL3.7 T·m +11%, better
Xmax2 mm +67%, better
Sensitivity82.6 dB +0.9
Dayton AudioDMA70-4
£17.51 · 22% less, betterFs113 Hz −34%, better
Qts0.44 −6%
Vas0.57 L +466%, worse
BL3.7 T·m +11%, better
Xmax2 mm +67%, better
Sensitivity83.7 dB +2, better
MonacorSPX-32M
£18.42 · 18% less, betterFs110 Hz −35%, better
Qts0.56 +19%, worse
Vas1.6 L +1500%, worse
BL3.7 T·m +11%, better
Xmax1.1 mm −8%
Sensitivity87.5 dB +5.8, better
EminenceALPHA 3-8
£24.24 · 8% more, worseFs118 Hz −31%, better
Qts0.50 +6%
Vas0.95 L +850%, worse
BL3.9 T·m +18%, better
Xmax2.4 mm +100%, better
Sensitivity86.7 dB +5, better
Dayton AudioRS75-8
£29.22 · 30% more, worseFs185 Hz +9%
Qts1.07 +128%, worse
Vas0.11 L +13%, worse
BL2.5 T·m −23%, worse
Xmax1.3 mm +8%
Sensitivity79.3 dB −2.4, worse
Tang BandW1-1070SH
£29.31 · 30% more, worseFs180 Hz +6%
Qts0.42 −11%, better
Vas0.09 L −10%, better
BL3.2 T·m –
Xmax2 mm +67%, better
Sensitivity82.1 dB –
Tang BandW3-315E
£32.19 · 43% more, worseFs100 Hz −41%, better
Qts0.52 +11%, worse
Vas1.7 L +1580%, worse
BL3.9 T·m +17%, better
Xmax1.3 mm +4%
Sensitivity86.7 dB +5, better
MarkaudioCHN-70
£33.49 · 49% more, worseFs72 Hz −58%, better
Qts0.48 –
Vas5.3 L +5210%, worse
BL3.4 T·m –
Xmax4 mm +233%, better
Sensitivity86.8 dB +5.1, better
MarkaudioCHN-719
£37.64 · 67% more, worseFs68 Hz −60%, better
Qts0.50 +6%
Vas4.7 L +4625%, worse
BL4.0 T·m +19%, better
Xmax4.3 mm +258%, better
Sensitivity86.1 dB +4.4, better
WavecorFR070WA02
£81.22 · 261% more, worseFs114 Hz −33%, better
Qts0.53 +13%, worse
Vas0.6 L +510%, worse
BL3.6 T·m +8%
Xmax2 mm +67%, better
Sensitivity84.2 dB +2.5, better
WavecorFR070WA05
£100.39 · 346% more, worseFs89 Hz −48%, better
Qts0.47 –
Vas0.6 L +500%, worse
BL3.8 T·m +13%, better
Xmax2.7 mm +125%, better
Sensitivity81.4 dB –
Tang BandW1-1931S
No current priceFs170 Hz –
Qts0.46 –
Vas0.02 L −80%, better
BL2.6 T·m −22%, worse
Xmax1.2 mm –
Sensitivity74.6 dB −7.1, worse
WavecorFR055WA04
No current priceFs128 Hz −25%, better
Qts0.51 +9%
Vas0.33 L +230%, worse
BL3.3 T·m –
Xmax1.4 mm +13%, better
Sensitivity83 dB +1.3
MarkaudioPLUVIA 7 P MICA
No current priceFs72 Hz −57%, better
Qts0.47 –
Vas4.5 L +4359%, worse
BL3.2 T·m –
Xmax4 mm +233%, better
Sensitivity86.9 dB +5.2, better
Tang BandW3-316B
No current priceFs100 Hz −41%, better
Qts0.44 −6%
Vas1.9 L +1790%, worse
BL4.1 T·m +24%, better
Xmax1.2 mm –
Sensitivity88 dB +6.3, better
Dayton AudioCE4249N-4
No current priceFs184 Hz +8%
Qts0.49 +4%
Vas0.039 L −61%, better
BL2.9 T·m −11%, worse
Xmax1.6 mm +33%, better
Sensitivity78.6 dB −3.1, worse
Tang BandW3-926SDF
No current priceFs100 Hz −41%, better
Qts0.49 +4%
Vas1.9 L +1790%, worse
BL3.7 T·m +12%, better
Xmax0.75 mm −38%, worse
Sensitivity87.5 dB +5.8, better
Tang BandW1-2121S
No current priceFs120 Hz −29%, better
Qts0.35 −26%, better
Vas0.11 L +10%
BL3.1 T·m −5%
Xmax2.3 mm +92%, better
Sensitivity78.1 dB −3.6, worse
Tang BandW3-926SD
No current priceFs110 Hz −35%, better
Qts0.46 –
Vas1.9 L +1790%, worse
BL3.8 T·m +16%, better
Xmax0.75 mm −38%, worse
Sensitivity89 dB +7.3, better
WavecorSW084OM01
No current priceFs74 Hz −56%, better
Qts0.44 −6%
Vas1.7 L +1600%, worse
BL3.6 T·m +7%
Xmax4.5 mm +275%, better
Sensitivity83.8 dB +2.1, better
FountekFR59EXE
No current priceFs139 Hz −18%, better
Qts0.36 −23%, better
Vas0.15 L +50%, worse
BL3.0 T·m −10%
Xmax1.4 mm +17%, better
Sensitivity81.3 dB –
Tang BandW3-1053SC
No current priceFs100 Hz −41%, better
Qts0.52 +11%, worse
Vas1.8 L +1670%, worse
BL3.7 T·m +12%, better
Xmax0.75 mm −38%, worse
Sensitivity87 dB +5.3, better
Dayton AudioDMA80-4
No current priceFs94 Hz −45%, better
Qts0.41 −13%, better
Vas1.4 L +1316%, worse
BL3.7 T·m +11%, better
Xmax2.5 mm +108%, better
Sensitivity85.6 dB +3.9, better
Tang BandW1-2370S
No current priceFs170 Hz –
Qts0.47 –
Vas0.051 L −49%, better
BL1.5 T·m −54%, worse
Xmax1 mm −17%, worse
Sensitivity77.9 dB −3.8, worse
Tang BandW1-1815SA
No current priceFs170 Hz –
Qts0.53 +13%, worse
Vas0.038 L −62%, better
BL2.1 T·m −36%, worse
Xmax1.3 mm +4%
Sensitivity77 dB −4.7, worse
Tang BandW1-2025SA
No current priceFs200 Hz +18%, worse
Qts0.46 –
Vas0.05 L −50%, better
BL2.1 T·m −36%, worse
Xmax0.75 mm −38%, worse
Sensitivity80.5 dB −1.2
Tang BandW46-1316N
No current priceFs50 Hz −71%, better
Qts0.46 –
Vas6.8 L +6730%, worse
BL5.7 T·m +73%, better
Xmax5 mm +317%, better
Sensitivity84.2 dB +2.5, better
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 |
|---|---|---|---|---|
LTT Import VAT and duty may apply | £22.52, the lowest price | Stock not listed | Visit shop at LTT | |
Audiophonics Import VAT and duty may apply | £27.55 | 22% above the lowest price | In stock | Visit shop at Audiophonics |
Best price over time
Tracked since 27 Sep