- Net volume
- 9L
- Tuning
- 62Hz
B&C gives the volume and tuning; the port is sized for the driver when you open it.
6.5-inch LF driver · 6NDL series · 38 mm voice coil · 150 W
B&C 6NDL38 4Ω
70–5000 Hz
£98.16
SteadyJP Leisure · In stock · All 4 offers
- Fs
- 69Hz
- Xmax
- 6mm
- SPL
- 90dB
- Pe
- 150W
- BL
- 7.8T·m
- Vd
- 79cm³
- Qts
- 0.39
- Vas
- 7L
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 4b5205720fba…Medium confidence4,168 selected pixels of 4,168 - Trace datasheet-response-trace-poc/v2
free-air impedance
Impedance response
240 plotted pointsSource file SHA-256 4b5205720fba…Medium confidence4,034 selected pixels of 4,034
Published graphs
B&C 6NDL38 is a 6.5-inch 4 ohm LF driver rated at 150 W RMS. The validated T/S data includes Fs 69 Hz, Qts 0.39, Vas 7.1 L, Xmax 6 mm, sensitivity 89.7 dB, plus 79 cm³ Vd and 173 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 £98.16.
The published T/S values agree with each other
Thiele/Small
- Fs
- 69Hz
- Qts
- 0.39
- Qes
- 0.40
- Qms
- 10.1
- Vas
- 7.1L
- Re
- 3.1Ω
- Le
- 0.40mH
Motor and cone
- BL
- 7.8T·m
- Sd
- 132cm²
- Mms
- 18g
- Xmax
- 6mm
- Vd †
- 79cm³
- Voice coil
- 38mm
- Flux density
- 1.15T
Power and response
- Sensitivity †
- 89.7dB
- Manufacturer sensitivity
- 91dB
- Power
- 150W
- Nominal power
- 150W
- Impedance
- 4Ω
- Min. impedance
- 3.5Ω
- Range
- 70–5000Hz
- EBP †
- 173 · Leans vented
Size and mounting
- Diameter
- 187mm
- Cutout
- 145mm
- Bolt circle
- 172mm
- Depth
- 85mm
- Weight
- 1.2kg
Sensitivity shows 89.7 dB, calculated from the T/S values. B&C publishes 91.0 dB, 1.3 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else B&C lists
LF
- BL
- 7.8T·m
- Fs
- 69Hz
- Le
- 0.40mH
- Re
- 3.1Ω
- Sd
- 132cm²
- Mms
- 18g
- Qes
- 0.40
- Qms
- 10.1
- Qts
- 0.39
- SPL
- 89.7dB
- Vas
- 7.1L
- Xmax
- 6mm
- Power
- 150W
- Impedance
- 4Ω
- Flux density
- 1.15T
- Sensitivity
- 91dB
- Low limit
- 70Hz
- Nominal power
- 150W
- Calculated sensitivity †
- 89.7dB
- High limit
- 5000Hz
- Manufacturer sensitivity
- 91dB
- Min. impedance
- 3.5Ω
- Voice coil
- 38mm
- Weight
- 1.2kg
- Diameter
- 187mm
- Depth
- 85mm
- Cutout
- 145mm
- Bolt circle
- 172mm
- Bl
- 7.8 Tm
- Fs
- 69 Hz
- Le
- 0.4 mH
- Re
- 3.1 Ω
- Sd
- 132 cm² (20.5 in²)
- Ebp
- 173 Hz
- Mms
- 18 g
- Qes
- 0.4
- Qms
- 10.05
- Qts
- 0.39
- Vas
- 7.1 dm³ (0.25 ft³)
- Η0
- 0.55 %
- Cone
- RCK06NDL384
- Xmax
- 6 mm
- Xvar
- 5.5 mm
- Depth
- 85 mm (3.3 in)
- Spider
- Single
- Cone shape
- Exponential
- Net weight
- 1.2 kg (2.6 lb)
- Pole design
- T-Pole
- Sensitivity
- 91 dB
- Flux density
- 1.15 T
- Shipping box
- 210x210x125 mm (8.27x8.27x4.92 in)
- Winding depth
- 12 mm (0.5 in)
- Shipping units
- 1 pcs
- Surround shape
- Roll
- Former material
- Kapton
- Frequency range
- 70 Hz - 5000 Hz
- Magnet material
- Neodymium Ring
- Shipping weight
- 1.4 kg (3.09 lb)
- Nominal diameter
- 170 mm (6.5 in)
- Overall diameter
- 187 mm (7.4 in)
- Winding material
- Copper
- Minimum impedance
- 3.5 Ω
- Nominal impedance
- 4 Ω
- Magnetic gap depth
- 6 mm (0.25 in)
- Recommended tuning
- 62 Hz
- Voice coil diameter
- 38 mm (1.5 in)
- Bolt circle diameter
- 172 mm (6.7 in)
- Recommended enclosure
- 9 dm³ (0.32 ft³)
- Woofer cone treatment
- WP Waterproof Front Side
- Baffle cutout diameter
- 145 mm (5.7 in)
- Nominal power handling
- 150 W
- Continuous power handling
- 300 W
- Flange and gasket thickness
- 11 mm (0.4 in)
- Air volume occupied by driver
- 0.63 dm³ (0.02 ft³)
B&C’s suggested box
From B&C’s 6NDL38 page
Open this box in 00 Simulator
Modelling the box in 00 Simulator…
03
Compare
Same-size drivers, compared with the 6NDL38. Clear differences are green when better and red when worse.
This driver6NDL38
Best price
£98.16
Fs
69 Hz
Qts
0.39
Vas
7.1 L
BL
7.8 T·m
Xmax
6 mm
Sensitivity
89.7 dB
Power
150 W
Beyma6CMV2
£40.92 · 58% less, betterFs90 Hz +30%, worse
Qts0.34 −13%, better
Vas6.5 L −8%
BL9.4 T·m +21%, better
Xmax5.7 mm −5%
Sensitivity92.3 dB +2.6, better
Sica6 H 1.5 CP
£55.81 · 43% less, betterFs46 Hz −33%, better
Qts0.35 −10%, better
Vas16.6 L +134%, worse
BL8.4 T·m +8%
Xmax6 mm –
Sensitivity88.3 dB −1.4
MonacorSPH-176
£58.80 · 40% less, betterFs39 Hz −43%, better
Qts0.37 −5%
Vas27 L +280%, worse
BL7.7 T·m –
Xmax5.5 mm −8%
Sensitivity87.6 dB −2.1, worse
CelestionTFX0615
£59.20 · 40% less, betterFs97 Hz +40%, worse
Qts0.38 −4%
Vas7.2 L –
BL9.8 T·m +26%, better
Xmax5.3 mm −13%, worse
Sensitivity93.8 dB +4.1, better
LavoceWAF061.80
£64.36 · 34% less, betterFs65 Hz −6%
Qts0.42 +8%
Vas7.3 L –
BL9.5 T·m +21%, better
Xmax4.9 mm −18%, worse
Sensitivity88.6 dB −1.1
B&C6PEV13
£75.38 · 23% less, betterFs126 Hz +83%, worse
Qts0.36 −8%
Vas6 L −15%, better
BL8.2 T·m +5%
Xmax2.5 mm −58%, worse
Sensitivity96.9 dB +7.2, better
WavecorWF182BD12
£119.63 · 22% more, worseFs30 Hz −57%, better
Qts0.37 −5%
Vas32.4 L +356%, worse
BL8.2 T·m +5%
Xmax5.5 mm −8%
Sensitivity85.4 dB −4.3, worse
£127.06 · 29% more, worse
Fs43 Hz −38%, better
Qts0.37 −5%
Vas22 L +210%, worse
BL6.9 T·m −12%, worse
Xmax6 mm –
Sensitivity87.9 dB −1.8
B&C6FHX51
£129.07 · 31% more, worseFs85 Hz +23%, worse
Qts0.37 −5%
Vas5 L −30%, better
BL11.3 T·m +45%, better
Xmax5.7 mm −5%
Sensitivity90.9 dB +1.2
CIARECMI160ND
£130.61 · 33% more, worseFs73 Hz +6%
Qts0.41 +5%
Vas6 L −15%, better
BL7.8 T·m –
Xmax4.5 mm −25%, worse
Sensitivity89.2 dB −0.5
WavecorWF152BD12
£151.60 · 54% more, worseFs46 Hz −33%, better
Qts0.38 –
Vas9.6 L +35%, worse
BL7.2 T·m −8%
Xmax4.5 mm −25%, worse
Sensitivity85.7 dB −4, worse
Scanspeak15W/8530K00
£157.03 · 60% more, worseFs39 Hz −43%, better
Qts0.39 –
Vas16 L +125%, worse
BL6.6 T·m −15%, worse
Xmax6.5 mm +8%
Sensitivity85.5 dB −4.2, worse
B&C6HCX51
£175.82 · 79% more, worseFs89 Hz +29%, worse
Qts0.38 –
Vas5 L −30%, better
BL10.9 T·m +40%, better
Xmax5.5 mm −8%
Sensitivity91.5 dB +1.8
WavecorWF182BD20
£190.56 · 94% more, worseFs30 Hz −57%, better
Qts0.37 −5%
Vas32.4 L +356%, worse
BL8.2 T·m +5%
Xmax5.5 mm −8%
Sensitivity85.4 dB −4.3, worse
£508.13 · 418% more, worse
Fs33 Hz −52%, better
Qts0.39 –
Vas33 L +365%, worse
BL7.9 T·m –
Xmax7 mm +17%, better
Sensitivity86.5 dB −3.2, worse
CelestionNTR06-1705D
No current priceFs49 Hz −29%, better
Qts0.38 −3%
Vas21.4 L +202%, worse
BL8.2 T·m +5%
Xmax6 mm –
Sensitivity90 dB –
WavecorWF152BD07
No current priceFs52 Hz −25%, better
Qts0.39 –
Vas9.2 L +30%, worse
BL8 T·m –
Xmax4.5 mm −25%, worse
Sensitivity86.9 dB −2.8, worse
WavecorWF152BD15
No current priceFs52 Hz −25%, better
Qts0.39 –
Vas9.2 L +30%, worse
BL8 T·m –
Xmax4.5 mm −25%, worse
Sensitivity86.9 dB −2.8, worse
MonacorTFX0615/8
No current priceFs97 Hz +41%, worse
Qts0.38 −4%
Vas7.2 L –
BL9.8 T·m +26%, better
Xmax5.3 mm −13%, worse
Sensitivity93.9 dB +4.2, better
Oberton6NCX
No current priceFs89 Hz +29%, worse
Qts0.36 −7%
Vas7.0 L –
BL9 T·m +15%, better
Xmax4.8 mm −21%, worse
Sensitivity93.1 dB +3.4, better
Sica5.5 H 1.5 CP
No current priceFs48 Hz −30%, better
Qts0.37 −5%
Vas8.4 L +18%, worse
BL7.2 T·m −7%
Xmax4.5 mm −25%, worse
Sensitivity85.7 dB −4, worse
PRV Audio6MB550FT-4
No current priceFs86 Hz +25%, worse
Qts0.34 −13%, better
Vas6.6 L −7%
BL8.6 T·m +11%, better
Xmax5.4 mm −10%
Sensitivity92.9 dB +3.2, better
PeerlessFSL-0615R01-08
No current priceFs84 Hz +22%, worse
Qts0.45 +15%, worse
Vas6.7 L −5%
BL8.5 T·m +9%
Xmax6 mm –
Sensitivity91 dB +1.3
WavecorWF152BD11
No current priceFs53 Hz −23%, better
Qts0.40 –
Vas8.6 L +21%, worse
BL7.2 T·m −8%
Xmax4.5 mm −25%, worse
Sensitivity86.9 dB −2.8, worse
CIARECMI160
No current priceFs70 Hz –
Qts0.41 +5%
Vas7.8 L +10%
BL7.2 T·m −8%
Xmax4.5 mm −25%, worse
Sensitivity89.8 dB –
HiViSS6.5R
No current priceFs42 Hz −39%, better
Qts0.39 –
Vas21.6 L +204%, worse
BL6.5 T·m −17%, worse
Xmax5.8 mm −3%
Sensitivity87.7 dB −2, worse
HiViD5.8B
No current priceFs52 Hz −25%, better
Qts0.37 −5%
Vas5.6 L −21%, better
BL9 T·m +15%, better
Xmax4.8 mm −20%, worse
Sensitivity84.8 dB −4.9, worse
HiViS6.5R
No current priceFs41 Hz −41%, better
Qts0.38 –
Vas23.2 L +227%, worse
BL6.5 T·m −17%, worse
Xmax5.8 mm −3%
Sensitivity87.8 dB −1.9
HiViD6.4MKII
No current priceFs53 Hz −23%, better
Qts0.35 −10%, better
Vas8.5 L +20%, worse
BL7.8 T·m –
Xmax3.5 mm −42%, worse
Sensitivity86.9 dB −2.8, worse
FaitalPRO6FE400
No current priceFs100 Hz +45%, worse
Qts0.36 −8%
Vas4.9 L −31%, better
BL8.8 T·m +13%, better
Xmax4.9 mm −19%, worse
Sensitivity93 dB +3.3, 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 | £98.16, the lowest price | In stock | Visit shop at JP Leisure | |
JP Leisure Not currently listed · Last seen 7 Aug 2026 | £98.16 | In stock | Visit shop at JP Leisure | |
Blue Aran 5-7 weeks | £99.00 | 0.9% above the lowest price | 20 in stock | Visit shop at Blue Aran |
Audio Video Parts Import VAT and duty may apply | £78.56 | Special order | Visit shop at Audio Video Parts |
Best price over time
Tracked since 1 Apr
Recent changes
- 17 JulBlue Aran£99.41 → £99.00Down 0.4% from £99.41
- 23 JunJP Leisure£100.79 → £98.16Down 2.6% from £100.79
- 23 JunBlue Aran£99.44 → £99.41Down <0.1% from £99.44