B&C12MH32
£138.88 · 34% less, betterFs53 Hz +6%
Qts0.19 +19%, worse
Vas63 L +6%
BL22.3 T·m −20%, worse
Xmax5 mm +233%, better
Sensitivity98.7 dB –
12-inch LF driver · 76 mm voice coil · 450 W
REDCATT 121NPM 8Ω
8 Ω
No price for delivery to the UK
- Fs
- 50Hz
- Xmax
- 1.5mm
- SPL
- 99dB
- Pe
- 450W
- BL
- 27.8T·m
- Vd
- 80cm³
- Qts
- 0.16
- Vas
- 59L
REDCATT 121NPM is a 12-inch 8 ohm LF driver rated at 450 W RMS. The validated T/S data includes Fs 50 Hz, Qts 0.16, Vas 59.2 L, Xmax 1.5 mm, sensitivity 98.7 dB, plus 80 cm³ Vd and 313 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 £211.16.
The published T/S values agree with each other
Thiele/Small
- Fs
- 50Hz
- Qts
- 0.16
- Qes
- 0.16
- Qms
- 7.5
- Vas
- 59.2L
- Re
- 6Ω
- Le
- 0.51mH
Motor and cone
- BL
- 27.8T·m
- Sd
- 531cm²
- Mms
- 67g
- Xmax
- 1.5mm
- Vd †
- 80cm³
- Voice coil
- 76mm
Power and response
- Sensitivity †
- 98.7dB
- Manufacturer sensitivity
- 100dB
- Power
- 450W
- Impedance
- 8Ω
- EBP †
- 313 · Leans vented
Size and mounting
- Diameter
- 315mm
- Cutout
- 285mm
- Bolt circle
- 298mm
- Weight
- 4kg
Other published values
- Xmech
- 11.5
- Power Peak
- 1800
Other dimensions
- Mounting Depth
- 123.5
Sensitivity shows 98.7 dB, calculated from the T/S values. REDCATT publishes 100.0 dB, 1.3 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else REDCATT lists
LF · Primary · 12″
- BL
- 27.8T·m
- Fs
- 50Hz
- Le
- 0.51mH
- Re
- 6Ω
- Sd
- 531cm²
- Mms
- 67g
- Qes
- 0.16
- Qms
- 7.5
- Qts
- 0.16
- SPL
- 98.7dB
- Vas
- 59.2L
- Xmax
- 1.5mm
- Xmech
- 11.5
- Power
- 450W
- Impedance
- 8Ω
- Power Peak
- 1800
- Sensitivity
- 100dB
- Calculated sensitivity †
- 98.7dB
- Manufacturer sensitivity
- 100dB
- Voice coil
- 76mm
- Weight
- 4kg
- Diameter
- 315mm
- Mounting Depth
- 123.5
- Cutout
- 285mm
- Bolt circle
- 298mm
02
Compare
Same-size drivers, compared with the 121NPM. Clear differences are green when better and red when worse.
This driver121NPM
Best price
£211.16
Fs
50 Hz
Qts
0.16
Vas
59.2 L
BL
27.8 T·m
Xmax
1.5 mm
Sensitivity
98.7 dB
Power
450 W
B&C12FW76
£150.38 · 29% less, betterFs54 Hz +8%
Qts0.18 +12%, worse
Vas45 L −24%, better
BL26.4 T·m −5%
Xmax7 mm +367%, better
Sensitivity98 dB −0.7
B&C12NW76
£201.06 · 5% lessFs40 Hz −20%, better
Qts0.16 –
Vas76 L +28%, worse
BL25.5 T·m −8%
Xmax8 mm +433%, better
Sensitivity96.6 dB −2.1, worse
CIARE12.00SW
£203.33 · 4% lessFs30 Hz −40%, better
Qts0.34 +113%, worse
Vas59 L –
BL25.3 T·m −9%
Xmax14 mm +833%, better
Sensitivity88.5 dB −10.2, worse
Eighteen Sound12MB1000
£204.35 · 3% lessFs54 Hz +8%
Qts0.18 +12%, worse
Vas60 L –
BL23.5 T·m −15%, worse
Xmax2.5 mm +67%, better
Sensitivity98.8 dB –
Sica12 F 4 CP
£218.81 · 4% moreFs46 Hz −8%
Qts0.20 +25%, worse
Vas52 L −12%, better
BL26.0 T·m −6%
Xmax6 mm +300%, better
Sensitivity95.8 dB −2.9, worse
RCFMB12N351
£225.00 · 7% more, worseFs55 Hz +10%, worse
Qts0.20 +25%, worse
Vas61 L +3%
BL22.5 T·m −19%, worse
Xmax6 mm +300%, better
Sensitivity98.9 dB –
B&C12NBX100
£244.15 · 16% more, worseFs41 Hz −18%, better
Qts0.22 +38%, worse
Vas51 L −14%, better
BL25.6 T·m −8%
Xmax10 mm +567%, better
Sensitivity93.7 dB −5, worse
REDCATT122NPW
£251.33 · 19% more, worseFs35 Hz −30%, better
Qts0.17 +6%
Vas81.9 L +38%, worse
BL27 T·m –
Xmax5.8 mm +283%, better
Sensitivity95.2 dB −3.5, worse
B&C12NW100
£251.75 · 19% more, worseFs42 Hz −16%, better
Qts0.20 +25%, worse
Vas44 L −26%, better
BL28 T·m –
Xmax9 mm +500%, better
Sensitivity93.9 dB −4.8, worse
Eighteen Sound12NMB1000
£252.00 · 19% more, worseFs54 Hz +8%
Qts0.19 +19%, worse
Vas58 L –
BL24.4 T·m −12%, worse
Xmax3.5 mm +133%, better
Sensitivity98.8 dB –
Eighteen Sound12ND610
£266.75 · 26% more, worseFs46 Hz −8%
Qts0.14 −12%, better
Vas94.4 L +59%, worse
BL24 T·m −14%, worse
Xmax3.5 mm +133%, better
Sensitivity99.9 dB +1.2
Dayton AudioRSS315HO-44
£278.74 · 32% more, worseFs22 Hz −57%, better
Qts0.37 +131%, worse
Vas61.3 L +4%
BL26.5 T·m −5%
Xmax14 mm +833%, better
Sensitivity83.7 dB −15, worse
BMS12C362
£287.08 · 36% more, worseFs46 Hz −8%
Qts0.20 +25%, worse
Vas60.6 L –
BL23.2 T·m −17%, worse
Xmax4.5 mm +200%, better
Sensitivity96.7 dB −2, worse
BMS12N810
£315.78 · 50% more, worseFs41 Hz −19%, better
Qts0.16 –
Vas89.6 L +51%, worse
BL24.5 T·m −12%, worse
Xmax2.5 mm +67%, better
Sensitivity97.5 dB −1.2
Beyma12P80ND
£376.94 · 79% more, worseFs47 Hz −6%
Qts0.19 +19%, worse
Vas65 L +10%
BL23.7 T·m −15%, worse
Xmax7.5 mm +400%, better
Sensitivity97.3 dB −1.4
Oberton12NMB600
No current priceFs41 Hz −18%, better
Qts0.13 −16%, better
Vas70.8 L +20%, worse
BL27.8 T·m –
Xmax5.3 mm +250%, better
Sensitivity97.6 dB −1.1
BMS12N820
No current priceFs38 Hz −24%, better
Qts0.16 –
Vas98.7 L +67%, worse
BL24.2 T·m −13%, worse
Xmax4.5 mm +200%, better
Sensitivity97.3 dB −1.4
Precision DevicesPD.123C001
No current priceFs35 Hz −30%, better
Qts0.14 −10%, better
Vas122 L +106%, worse
BL24.5 T·m −12%, worse
Xmax7.5 mm +400%, better
Sensitivity97.5 dB −1.2
Oberton12NB400
No current priceFs44 Hz −13%, better
Qts0.18 +12%, worse
Vas70.5 L +19%, worse
BL20.3 T·m −27%, worse
Xmax5.3 mm +250%, better
Sensitivity97.1 dB −1.6
JensenMOD12-70-4
No current priceFs74 Hz +48%, worse
Qts0.90 +463%, worse
Vas51.7 L −13%, better
BL7.2 T·m −74%, worse
Xmax1.5 mm –
Sensitivity94.4 dB −4.3, worse
BMS12S310
No current priceFs45 Hz −9%
Qts0.20 +25%, worse
Vas66.9 L +13%, worse
BL24.2 T·m −13%, worse
Xmax2.5 mm +67%, better
Sensitivity97 dB −1.7
JensenMOD12-70-8
No current priceFs78 Hz +56%, worse
Qts0.89 +456%, worse
Vas48.1 L −19%, better
BL8.3 T·m −70%, worse
Xmax1.5 mm –
Sensitivity97.5 dB −1.2
JensenJN12-65TRS-16
No current priceFs80 Hz +60%, worse
Qts1.27 +694%, worse
Vas47.3 L −20%, better
BL11.1 T·m −60%, worse
Xmax1.5 mm –
Sensitivity95.5 dB −3.2, worse
Eighteen Sound12ND940
No current priceFs49 Hz –
Qts0.20 +25%, worse
Vas64.8 L +9%
BL22.2 T·m −20%, worse
Xmax7.6 mm +407%, better
Sensitivity97.8 dB −0.9
JensenC12Q-16
No current priceFs86 Hz +72%, worse
Qts1.99 +1144%, worse
Vas46.3 L −22%, better
BL8.2 T·m −71%, worse
Xmax1.5 mm –
Sensitivity93.9 dB −4.8, worse
RCFMB12N405
No current priceFs52 Hz +4%
Qts0.20 +25%, worse
Vas53 L −10%, better
BL23.5 T·m −15%, worse
Xmax7 mm +367%, better
Sensitivity97.5 dB −1.2
RCFCX12N351
No current priceFs58 Hz +16%, worse
Qts0.20 +25%, worse
Vas47 L −21%, better
BL25 T·m −10%, worse
Xmax6 mm +300%, better
Sensitivity98.4 dB –
JensenMOD12-50-8
No current priceFs82 Hz +64%, worse
Qts1.40 +775%, worse
Vas43.6 L −26%, better
BL7.4 T·m −73%, worse
Xmax1.5 mm –
Sensitivity92.7 dB −6, worse
JensenJN12-65TRS-8
No current priceFs83 Hz +66%, worse
Qts0.95 +494%, worse
Vas43.5 L −27%, better
BL9.4 T·m −66%, worse
Xmax1.5 mm –
Sensitivity94.5 dB −4.2, worse
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
None of the shops we track lists delivery to the UK at checkout.