Sica5 F 1.5 CP
£38.51 · 10% less, betterFs61 Hz −45%, better
Qts0.30 +11%, worse
Vas6.8 L +325%, worse
BL7.6 T·m −16%, worse
Xmax3.5 mm −8%
Sensitivity88.7 dB −2.1, worse
4-inch LF driver · 4NDF series · 34 mm voice coil · 100 W
B&C 4NDF34 8Ω
8 Ω · 110–8000 Hz
£55.09
11%JP Leisure · In stock · All 4 offers
- Fs
- 110Hz
- Xmax
- 3.8mm
- SPL
- 91dB
- Pe
- 100W
- BL
- 9T·m
- Vd
- 22cm³
- Qts
- 0.27
- Vas
- 2L
Manufacturer response and impedance data, with source and trace details below. The left and right arrow keys read every shown curve at a frequency, a twelfth of an octave at a time, or an octave with Shift. Escape clears the reading.
Curve provenanceInspect 2 traces
These plotted lines are Bits digitizations of manufacturer evidence, not new measurements. How provenance works
- Trace datasheet-response-trace-poc/v2
free-air SPL
Frequency response
240 plotted pointsSource file SHA-256 264449ecbc62…Medium confidence5,026 selected pixels of 5,026 - Trace datasheet-response-trace-poc/v2
free-air impedance
Impedance response
240 plotted pointsSource file SHA-256 264449ecbc62…Medium confidence3,626 selected pixels of 3,626
Published graphs
B&C 4NDF34 is a 4-inch 8 ohm LF driver rated at 100 W RMS. The validated T/S data includes Fs 110 Hz, Qts 0.27, Vas 1.6 L, Xmax 3.8 mm, sensitivity 90.8 dB, plus 22 cm³ Vd and 393 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 £42.70.
The published T/S values agree with each other
Thiele/Small
- Fs
- 110Hz
- Qts
- 0.27
- Qes
- 0.28
- Qms
- 4.2
- Vas
- 1.6L
- Re
- 5.5Ω
- Le
- 0.23mH
Motor and cone
- BL
- 9T·m
- Sd
- 57cm²
- Mms
- 6g
- Xmax
- 3.8mm
- Vd †
- 22cm³
- Voice coil
- 34mm
- Flux density
- 1.25T
Power and response
- Sensitivity †
- 90.8dB
- Manufacturer sensitivity
- 92dB
- Power
- 100W
- Nominal power
- 100W
- Impedance
- 8Ω
- Min. impedance
- 6.4Ω
- Range
- 110–8000Hz
- EBP †
- 393 · Leans vented
Size and mounting
- Diameter
- 127mm
- Cutout
- 103mm
- Bolt circle
- 115mm
- Depth
- 66mm
- Weight
- 0.55kg
Sensitivity shows 90.8 dB, calculated from the T/S values. B&C publishes 92.0 dB, 1.2 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else B&C lists
LF
- BL
- 9T·m
- Fs
- 110Hz
- Le
- 0.23mH
- Re
- 5.5Ω
- Sd
- 57cm²
- Mms
- 6g
- Qes
- 0.28
- Qms
- 4.2
- Qts
- 0.27
- SPL
- 90.8dB
- Vas
- 1.6L
- Xmax
- 3.8mm
- Power
- 100W
- Impedance
- 8Ω
- Flux density
- 1.25T
- Sensitivity
- 92dB
- Low limit
- 110Hz
- Nominal power
- 100W
- Calculated sensitivity †
- 90.8dB
- High limit
- 8000Hz
- Manufacturer sensitivity
- 92dB
- Min. impedance
- 6.4Ω
- Voice coil
- 34mm
- Weight
- 0.55kg
- Diameter
- 127mm
- Depth
- 66mm
- Cutout
- 103mm
- Bolt circle
- 115mm
- Bl
- 9 Tm
- Fs
- 110 Hz
- Le
- 0.23 mH
- Re
- 5.5 Ω
- Sd
- 57 cm² (8.84 in²)
- Ebp
- 393 Hz
- Mms
- 6.1 g
- Qes
- 0.28
- Qms
- 4.2
- Qts
- 0.27
- Vas
- 1.6 dm³ (0.06 ft³)
- Η0
- 0.7 %
- Cone
- RCK04NDF34
- Xmax
- 3.8 mm
- Xvar
- 5.7 mm
- Depth
- 66 mm (2.6 in)
- Spider
- Single
- Cone shape
- Exponential
- Net weight
- 0.55 kg (1.21 lb)
- Pole design
- T-Pole
- Sensitivity
- 92 dB
- Flux density
- 1.25 T
- Shipping box
- 117x120x110 mm (4.61x4.72x4.33 in)
- Winding depth
- 11 mm (0.43 in)
- Shipping units
- 1 pcs
- Surround shape
- Double Roll
- Former material
- Glass Fibre
- Frequency range
- 110 Hz - 8000 Hz
- Magnet material
- Neodymium Inside Slug
- Shipping weight
- 0.67 kg (1.48 lb)
- Nominal diameter
- 100 mm (4 in)
- Overall diameter
- 127 mm (5 in)
- Winding material
- Copper
- Minimum impedance
- 6.4 Ω
- Nominal impedance
- 8 Ω
- Magnetic gap depth
- 7 mm (0.28 in)
- Voice coil diameter
- 34 mm (1.3 in)
- Bolt circle diameter
- 115 mm (4.53 in)
- Woofer cone treatment
- TWP Waterproof Both Sides
- Baffle cutout diameter
- 103 mm (4.06 in)
- Nominal power handling
- 100 W
- Continuous power handling
- 200 W
- Flange and gasket thickness
- 3 mm (0.12 in)
- Air volume occupied by driver
- 0.25 dm³ (0.01 ft³)
02
Compare
Same-size drivers, compared with the 4NDF34. Clear differences are green when better and red when worse.
This driver4NDF34
Best price
£42.70
Fs
110 Hz
Qts
0.27
Vas
1.6 L
BL
9 T·m
Xmax
3.8 mm
Sensitivity
90.8 dB
Power
100 W
B&C4NDS34
£43.54 · 2% moreFs79 Hz −28%, better
Qts0.24 −11%, better
Vas2.6 L +63%, worse
BL8.8 T·m –
Xmax3.8 mm –
Sensitivity89.1 dB −1.7
SB AcousticsSB13PFCR25-4-COAX
£44.29 · 4% moreFs43 Hz −61%, better
Qts0.27 –
Vas14.4 L +800%, worse
BL5.1 T·m −43%, worse
Xmax4.7 mm +22%, better
Sensitivity87.8 dB −3, worse
SB AcousticsSB13PFC25-4-COAX
£46.01 · 8% more, worseFs43 Hz −61%, better
Qts0.27 –
Vas14.4 L +800%, worse
BL5.1 T·m −43%, worse
Xmax4.7 mm +22%, better
Sensitivity87.8 dB −3, worse
LavoceWSN041.00
£46.38 · 9% more, worseFs104 Hz −5%
Qts0.30 +11%, worse
Vas1.8 L +12%, worse
BL8.3 T·m −8%
Xmax4 mm +5%
Sensitivity90 dB −0.8
Dayton AudioCF120-4
£52.29 · 22% more, worseFs53 Hz −52%, better
Qts0.28 +4%
Vas4.9 L +204%, worse
BL4.9 T·m −45%, worse
Xmax3.5 mm −8%
Sensitivity85.6 dB −5.2, worse
Scanspeak12W/4524G00
£55.26 · 29% more, worseFs50 Hz −55%, better
Qts0.27 –
Vas8.2 L +412%, worse
BL4.4 T·m −51%, worse
Xmax3 mm −21%, worse
Sensitivity87.4 dB −3.4, worse
CIAREHWB130
£60.29 · 41% more, worseFs48 Hz −56%, better
Qts0.30 +11%, worse
Vas12.5 L +681%, worse
BL7.2 T·m −20%, worse
Xmax4.5 mm +18%, better
Sensitivity88.4 dB −2.4, worse
FaitalPRO5PR120
£70.33 · 65% more, worseFs100 Hz −9%
Qts0.27 –
Vas4.2 L +163%, worse
BL10 T·m +11%, better
Xmax3.1 mm −18%, worse
Sensitivity93.8 dB +3, better
B&C5FG44
£74.52 · 75% more, worseFs63 Hz −43%, better
Qts0.27 –
Vas6.3 L +294%, worse
BL10 T·m +11%, better
Xmax3 mm −21%, worse
Sensitivity89.2 dB −1.6
B&C5MDN38
£82.06 · 92% more, worseFs175 Hz +59%, worse
Qts0.31 +15%, worse
Vas1.4 L −13%, better
BL11.1 T·m +23%, better
Xmax3.5 mm −8%
Sensitivity95.2 dB +4.4, better
CIAREHWG130
£90.43 · 112% more, worseFs40 Hz −64%, better
Qts0.28 +4%
Vas12.5 L +681%, worse
BL7.8 T·m −13%, worse
Xmax6.5 mm +71%, better
Sensitivity86.3 dB −4.5, worse
Sica4 C 1.5 CP
£104.62 · 145% more, worseFs102 Hz −7%
Qts0.32 +19%, worse
Vas1.5 L −6%
BL7.3 T·m −19%, worse
Xmax2 mm −47%, worse
Sensitivity89.7 dB −1.1
PRV Audio5MR450-NDY
£115.51 · 170% more, worseFs159 Hz +45%, worse
Qts0.64 +137%, worse
Vas1.5 L −8%
BL9.4 T·m +5%
Xmax3.5 mm −9%
Sensitivity91.5 dB +0.7
PRV Audio5MR450-NDY-4
£115.51 · 170% more, worseFs150 Hz +36%, worse
Qts0.49 +81%, worse
Vas1.6 L –
BL7.9 T·m −12%, worse
Xmax3.3 mm −13%, worse
Sensitivity92.2 dB +1.4
Tang BandW3-1878
£125.60 · 194% more, worseFs75 Hz −32%, better
Qts0.28 +4%
Vas3.1 L +93%, worse
BL4.3 T·m −52%, worse
Xmax4 mm +5%
Sensitivity87.9 dB −2.9, worse
B&C5FCX44
£129.00 · 202% more, worseFs61 Hz −45%, better
Qts0.25 −7%
Vas7 L +338%, worse
BL10.5 T·m +17%, better
Xmax5 mm +32%, better
Sensitivity90.1 dB −0.7
SB AcousticsMW13P-4
£139.69 · 227% more, worseFs41 Hz −63%, better
Qts0.27 –
Vas14.6 L +813%, worse
BL4.9 T·m −46%, worse
Xmax5 mm +32%, better
Sensitivity87.4 dB −3.4, worse
SB AcousticsMW13PNW-4
£139.69 · 227% more, worseFs41 Hz −63%, better
Qts0.27 –
Vas14.6 L +813%, worse
BL4.9 T·m −46%, worse
Xmax5 mm +32%, better
Sensitivity87.4 dB −3.4, worse
Beyma5CX200ND
£220.02 · 415% more, worseFs75 Hz −32%, better
Qts0.28 +4%
Vas9.1 L +469%, worse
BL7.3 T·m −19%, worse
Xmax5.7 mm +50%, better
Sensitivity93.4 dB +2.6, better
SB AcousticsMR13TX-4
£251.15 · 488% more, worseFs44 Hz −60%, better
Qts0.27 –
Vas12.2 L +662%, worse
BL4.9 T·m −46%, worse
Xmax3 mm −21%, worse
Sensitivity87.7 dB −3.1, worse
Scanspeak12MU/8731T00
£263.71 · 518% more, worseFs66 Hz −40%, better
Qts0.29 +7%
Vas5.8 L +262%, worse
BL6.1 T·m −32%, worse
Xmax3.4 mm −11%, worse
Sensitivity89.3 dB −1.5
Scanspeak12MU/4731T00
£267.60 · 527% more, worseFs64 Hz −42%, better
Qts0.24 −11%, better
Vas5.4 L +238%, worse
BL5.1 T·m −43%, worse
Xmax3.5 mm −8%
Sensitivity89.4 dB −1.4
AccutonBD90-6-727
No current priceFs123 Hz +12%, worse
Qts0.28 +4%
Vas1.6 L –
BL10.7 T·m +19%, better
Xmax3 mm −21%, worse
Sensitivity92 dB +1.2
KartesianWIB100_VPA-S
No current priceFs94 Hz −15%, better
Qts0.27 –
Vas1.4 L −12%, better
BL9 T·m –
Xmax3 mm −21%, worse
Sensitivity89.5 dB −1.3
CelestionTFX0515-16
No current priceFs110 Hz –
Qts0.80 +196%, worse
Vas2.0 L +28%, worse
BL8.6 T·m −5%
Xmax3.8 mm –
Sensitivity87.1 dB −3.7, worse
Tang BandW3-1401SD
No current priceFs75 Hz −32%, better
Qts0.31 +15%, worse
Vas1.6 L +3%
BL5.6 T·m −38%, worse
Xmax3.5 mm −8%
Sensitivity84.7 dB −6.1, worse
Tang BandW4-937SF
No current priceFs65 Hz −41%, better
Qts0.26 −4%
Vas4.9 L +204%, worse
BL6.7 T·m −26%, worse
Xmax4.5 mm +18%, better
Sensitivity88.1 dB −2.7, worse
FaneSTUDIO 5HPM
No current priceFs164 Hz +49%, worse
Qts0.54 +100%, worse
Vas1.6 L –
BL7.9 T·m −12%, worse
Xmax4.5 mm +18%, better
Sensitivity92.1 dB +1.3
CelestionCN0515M
No current priceFs189 Hz +72%, worse
Qts0.28 –
Vas0.7 L −57%, better
BL19.2 T·m +113%, better
Xmax3.3 mm −14%, worse
Sensitivity93.4 dB +2.6, 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 |
|---|---|---|---|---|
JP Leisure | £55.09, the lowest price | In stock | Visit shop at JP Leisure | |
Blue Aran 4-6 weeks | £49.44 | Usually available in 4-6 weeks | Visit shop at Blue Aran | |
JP Leisure Not currently listed · Last seen 7 Aug 2026 | £55.09 | In stock | Visit shop at JP Leisure |
Best price over time
Tracked since 1 Apr
Recent changes
- 23 JunBlue Aran£49.46 → £49.44Down <0.1% from £49.46
- 23 JunJP Leisure£53.52 → £55.09Up 2.9% from £53.52
- 5 JunBlue Aran£46.06 → £49.46Up 7.4% from £46.06