SB Acoustics SB16PFC25-4 is a 6-inch 4 ohm LF driver rated at 40 W RMS. The validated T/S data includes Fs 35 Hz, Qts 0.34, Vas 32.7 L, Xmax 4.5 mm, sensitivity 87.6 dB, plus 56 cm³ Vd and 90 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 £23.73.

The published T/S values agree with each other

Thiele/Small

Fs: 35Hz
Qts: 0.34
Qes: 0.39
Qms: 2.8
Vas: 32.7L
Re: 3.2Ω
Le: 0.56mH

Motor and cone

BL: 5T·m
Sd: 124cm²
Mms: 14g
Xmax: 4.5mm
Vd †: 56cm³
Voice coil: 25mm
Flux density: 1.06T

Power and response

Sensitivity †: 87.6dB
Manufacturer sensitivity: 89.5dB
Power: 40W
Impedance: 4Ω
EBP †: 90 · Sealed or vented

Size and mounting

Weight: 1.0kg

Other published values

Cms: 1.50mm/N

Sensitivity shows 87.6 dB, calculated from the T/S values. SB Acoustics publishes 89.5 dB, 1.9 dB apart.

† Calculated by bits from the published values

What this validation status means

Everything else SB Acoustics lists

LF · Primary · 6″

BL: 5T·m
Fs: 35Hz
Le: 0.56mH
Re: 3.2Ω
Sd: 124cm²
Cms: 1.50mm/N
Mms: 14g
Qes: 0.39
Qms: 2.8
Qts: 0.34
SPL: 87.6dB
Vas: 32.7L
Xmax: 4.5mm
Power: 40W
Impedance: 4Ω
Flux density: 1.06T
Sensitivity: 89.5dB
Calculated sensitivity †: 87.6dB
Manufacturer sensitivity: 89.5dB
Voice coil: 25mm
Weight: 1.0kg

Compare

Same-size drivers, compared with the SB16PFC25-4. Clear differences are green when better and red when worse.

This driverSB16PFC25-4

Best price

£23.73

35 Hz

Qts

0.34

Vas

32.7 L

5 T·m

Xmax

4.5 mm

Sensitivity

87.6 dB

Power

40 W

SB AcousticsSB16PFCR25-4

£22.03 · 7% less

Fs35 Hz –

Qts0.34 –

Vas32.7 L –

BL5 T·m –

Xmax9 mm +100%

Sensitivity87.6 dB –

SB AcousticsSB13PFC25-8

£23.27 · 2% less

Fs45 Hz +29%

Qts0.33 –

Vas13.4 L −59%

BL6.2 T·m +24%

Xmax4.5 mm –

Sensitivity87 dB −0.6

Dayton AudioRS150P-4A

£45.37 · 91% more

Fs44 Hz +25%

Qts0.34 –

Vas15.7 L −52%

BL4.4 T·m −12%

Xmax4.4 mm –

Sensitivity87 dB −0.6

Dayton AudioRS150-4

£45.37 · 91% more

Fs45 Hz +29%

Qts0.33 –

Vas16.4 L −50%

BL4.1 T·m −18%

Xmax4.4 mm –

Sensitivity87.8 dB –

Dayton AudioRS150-8

£45.37 · 91% more

Fs48 Hz +37%

Qts0.34 –

Vas16.6 L −49%

BL5.6 T·m +12%

Xmax4 mm −11%

Sensitivity88.3 dB +0.7

SB AcousticsSB16PFC25-4-COAX

£48.27 · 103% more

Fs36 Hz –

Qts0.31 −9%

Vas31.3 L −4%

BL5.1 T·m –

Xmax4.7 mm +3%

Sensitivity88.2 dB +0.6

CIAREHW162

£48.31 · 104% more

Fs44 Hz +26%

Qts0.33 –

Vas24.8 L −24%

BL7.5 T·m +50%

Xmax4.5 mm –

Sensitivity89.4 dB +1.8

SB AcousticsSB16PFCR25-4-COAX

£49.62 · 109% more

Fs36 Hz –

Qts0.31 −9%

Vas31.3 L −4%

BL5.1 T·m –

Xmax4.7 mm +3%

Sensitivity88.2 dB +0.6

SB AcousticsSB15NRXC30-8

£54.80 · 131% more

Fs38 Hz +9%

Qts0.33 –

Vas20.7 L −37%

BL5.6 T·m +12%

Xmax5 mm +11%

Sensitivity87.1 dB −0.5

SB AcousticsSB17NRX2C35-4

£55.41 · 133% more

Fs36 Hz –

Qts0.37 +9%

Vas27.6 L −16%

BL4.9 T·m –

Xmax11 mm +144%

Sensitivity87 dB −0.6

Dayton AudioRS150P-8A

£58.74 · 148% more

Fs47 Hz +35%

Qts0.34 –

Vas16.7 L −49%

BL5.6 T·m +12%

Xmax4 mm −11%

Sensitivity88.1 dB +0.5

SB AcousticsSB17NRXC35-4

£58.90 · 148% more

Fs35 Hz –

Qts0.32 −6%

Vas35.2 L +8%

BL4.8 T·m −4%

Xmax5.5 mm +22%

Sensitivity88.5 dB +0.9

CIAREHWB160

£67.81 · 186% more

Fs46 Hz +31%

Qts0.36 +6%

Vas19.5 L −40%

BL6.5 T·m +30%

Xmax4.5 mm –

Sensitivity89 dB +1.4

SB AcousticsSB17NAC35-4

£72.00 · 203% more

Fs32 Hz −9%

Qts0.32 −6%

Vas33 L –

BL5.2 T·m +4%

Xmax5.5 mm +22%

Sensitivity87.1 dB −0.5

Scanspeak18W/4434G00

£72.89 · 207% more

Fs47 Hz +34%

Qts0.35 –

Vas20.7 L −37%

BL6 T·m +20%

Xmax4.3 mm −4%

Sensitivity89.7 dB +2.1

SEASH1455-08 ER15RLY

£81.26 · 242% more

Fs44 Hz +26%

Qts0.32 −6%

Vas15 L −54%

BL5.5 T·m +10%

Xmax5 mm +11%

Sensitivity87 dB −0.6

SB AcousticsSB17CRC35-4

£85.53 · 260% more

Fs32 Hz −10%

Qts0.32 −6%

Vas35.5 L +9%

BL5 T·m –

Xmax11 mm +144%

Sensitivity87 dB −0.6

SEASH1216-08 CA15RLY

£90.51 · 281% more

Fs44 Hz +26%

Qts0.34 –

Vas14 L −57%

BL5.5 T·m +10%

Xmax5 mm +11%

Sensitivity86.6 dB −1

Dayton AudioPS180-8

£90.76 · 282% more

Fs59 Hz +67%

Qts0.33 –

Vas27.6 L −16%

BL6.8 T·m +36%

Xmax4.6 mm –

Sensitivity93.9 dB +6.3

SEASH1520-08 U16RCY/P

£102.27 · 331% more

Fs36 Hz –

Qts0.32 −6%

Vas25 L −24%

BL6.3 T·m +26%

Xmax4 mm −11%

Sensitivity86.9 dB −0.7

WavecorWF152BD09

£111.20 · 369% more

Fs52 Hz +49%

Qts0.34 –

Vas8.6 L −74%

BL5.8 T·m +16%

Xmax4.5 mm –

Sensitivity87.4 dB –

WavecorWF152BD03

£144.52 · 509% more

Fs56 Hz +59%

Qts0.35 –

Vas9.2 L −72%

BL5.8 T·m +16%

Xmax4.5 mm –

Sensitivity88.4 dB +0.8

Scanspeak15W/8534T00

£156.76 · 561% more

Fs32 Hz −9%

Qts0.39 +15%

Vas30 L −8%

BL5.5 T·m +10%

Xmax5 mm +11%

Sensitivity85.6 dB −2

Tang BandW5-1880

£211.90 · 793% more

Fs48 Hz +37%

Qts0.32 −6%

Vas26.5 L −19%

BL5.5 T·m +9%

Xmax5 mm +11%

Sensitivity90.9 dB +3.3

Scanspeak18WU/4747T00

£292.38 · 1132% more

Fs36 Hz –

Qts0.35 –

Vas36 L +10%

BL5.9 T·m +18%

Xmax9 mm +100%

Sensitivity88.4 dB +0.8

AccutonC158-8-085

£330.52 · 1293% more

Fs37 Hz +6%

Qts0.36 +6%

Vas27.3 L −17%

BL7.7 T·m +54%

Xmax5 mm +11%

Sensitivity87.5 dB –

CIARECW169

No current price

Fs46 Hz +31%

Qts0.32 −6%

Vas21.2 L −35%

BL5.9 T·m +19%

Xmax5 mm +11%

Sensitivity89.3 dB +1.7

SB AcousticsSB17BAC35-8-COAX

No current price

Fs35 Hz –

Qts0.33 –

Vas33.1 L –

BL5.7 T·m +14%

Xmax3.1 mm −31%

Sensitivity88.1 dB +0.5

HiViS6N

No current price

Fs45 Hz +29%

Qts0.35 –

Vas23.4 L −28%

BL7.6 T·m +52%

Xmax4.3 mm −4%

Sensitivity89.4 dB +1.8

HiViSS6N

No current price

Fs44 Hz +26%

Qts0.36 +6%

Vas23.9 L −27%

BL7.6 T·m +52%

Xmax4.3 mm −4%

Sensitivity89.1 dB +1.5

Search similar

Tune the match

Choose the published values that matter to your design. Size stays matched to this driver.

Qts

Qes

Vas

Xmax

Reviews

How reviews work

5.0 out of 5

from 2 ratings at 1 shop

SoundImports5.0 out of 52 ratings · Checked 12 Oct 2026
Read reviews on SoundImports

Each shop collects its own ratings. Bits shows them as published and doesn't verify them.

Where to buy

Prices for delivery to the UK, including VAT. How prices work

Watch price

Shop	Price	Against the lowest	Stock	Link
Lautsprechershop Checked 12 Oct 2026 · Ships from Germany · 4 Ω · Source: inc VAT · 19% Import VAT and duty may apply	£23.73, the lowest price		Stock not listed	Visit shop at Lautsprechershop
RumoH Checked 12 Oct 2026 · Ships from Netherlands · 4 Ω · Source: inc VAT Import VAT and duty may apply	£27.41	16% above the lowest price	In stock	Visit shop at RumoH
SoundImports Checked 12 Oct 2026 · Ships from Netherlands · 4 Ω · Source: inc VAT Import VAT and duty may apply	£28.35	20% above the lowest price	2 in stock	Visit shop at SoundImports

Best price over time

Tracked since 1 Apr

bits00 AUDIO

6-inch LF driver · SB16 series · 25 mm voice coil · 40 W

SB Acoustics SB16PFC25-4 4Ω

4 Ω

2 ratings at 1 shop

£23.73

13%

10% below the average of 3 shops

Lautsprechershop · Ships from Germany · All 4 offers

Open in 00 Simulator

Fs: 35Hz
Xmax: 4.5mm
SPL: 88dB
Pe: 40W
BL: 5T·m
Vd: 56cm³
Qts: 0.34
Vas: 33L

See all 21 specs

Published graphs

Specifications

Published by SB Acoustics

Manufacturer page

Datasheet PDF

The published T/S values agree with each other

Thiele/Small

Fs: 35Hz
Qts: 0.34
Qes: 0.39
Qms: 2.8
Vas: 32.7L
Re: 3.2Ω
Le: 0.56mH

Motor and cone

BL: 5T·m
Sd: 124cm²
Mms: 14g
Xmax: 4.5mm
Vd †: 56cm³
Voice coil: 25mm
Flux density: 1.06T

Power and response

Sensitivity †: 87.6dB
Manufacturer sensitivity: 89.5dB
Power: 40W
Impedance: 4Ω
EBP †: 90 · Sealed or vented

Size and mounting

Weight: 1.0kg

Other published values

Cms: 1.50mm/N

Sensitivity shows 87.6 dB, calculated from the T/S values. SB Acoustics publishes 89.5 dB, 1.9 dB apart.

† Calculated by bits from the published values

What this validation status means

Everything else SB Acoustics lists

LF · Primary · 6″

BL: 5T·m
Fs: 35Hz
Le: 0.56mH
Re: 3.2Ω
Sd: 124cm²
Cms: 1.50mm/N
Mms: 14g
Qes: 0.39
Qms: 2.8
Qts: 0.34
SPL: 87.6dB
Vas: 32.7L
Xmax: 4.5mm
Power: 40W
Impedance: 4Ω
Flux density: 1.06T
Sensitivity: 89.5dB
Calculated sensitivity †: 87.6dB
Manufacturer sensitivity: 89.5dB
Voice coil: 25mm
Weight: 1.0kg

Compare

Same-size drivers, compared with the SB16PFC25-4. Clear differences are green when better and red when worse.

This driverSB16PFC25-4

Best price

£23.73

35 Hz

Qts

0.34

Vas

32.7 L

5 T·m

Xmax

4.5 mm

Sensitivity

87.6 dB

Power

40 W

SB AcousticsSB16PFCR25-4

£22.03 · 7% less

Fs35 Hz –

Qts0.34 –

Vas32.7 L –

BL5 T·m –

Xmax9 mm +100%

Sensitivity87.6 dB –

SB AcousticsSB13PFC25-8

£23.27 · 2% less

Fs45 Hz +29%

Qts0.33 –

Vas13.4 L −59%

BL6.2 T·m +24%

Xmax4.5 mm –

Sensitivity87 dB −0.6

Dayton AudioRS150P-4A

£45.37 · 91% more

Fs44 Hz +25%

Qts0.34 –

Vas15.7 L −52%

BL4.4 T·m −12%

Xmax4.4 mm –

Sensitivity87 dB −0.6

Dayton AudioRS150-4

£45.37 · 91% more

Fs45 Hz +29%

Qts0.33 –

Vas16.4 L −50%

BL4.1 T·m −18%

Xmax4.4 mm –

Sensitivity87.8 dB –

Dayton AudioRS150-8

£45.37 · 91% more

Fs48 Hz +37%

Qts0.34 –

Vas16.6 L −49%

BL5.6 T·m +12%

Xmax4 mm −11%

Sensitivity88.3 dB +0.7

SB AcousticsSB16PFC25-4-COAX

£48.27 · 103% more

Fs36 Hz –

Qts0.31 −9%

Vas31.3 L −4%

BL5.1 T·m –

Xmax4.7 mm +3%

Sensitivity88.2 dB +0.6

CIAREHW162

£48.31 · 104% more

Fs44 Hz +26%

Qts0.33 –

Vas24.8 L −24%

BL7.5 T·m +50%

Xmax4.5 mm –

Sensitivity89.4 dB +1.8

SB AcousticsSB16PFCR25-4-COAX

£49.62 · 109% more

Fs36 Hz –

Qts0.31 −9%

Vas31.3 L −4%

BL5.1 T·m –

Xmax4.7 mm +3%

Sensitivity88.2 dB +0.6

SB AcousticsSB15NRXC30-8

£54.80 · 131% more

Fs38 Hz +9%

Qts0.33 –

Vas20.7 L −37%

BL5.6 T·m +12%

Xmax5 mm +11%

Sensitivity87.1 dB −0.5

SB AcousticsSB17NRX2C35-4

£55.41 · 133% more

Fs36 Hz –

Qts0.37 +9%

Vas27.6 L −16%

BL4.9 T·m –

Xmax11 mm +144%

Sensitivity87 dB −0.6

Dayton AudioRS150P-8A

£58.74 · 148% more

Fs47 Hz +35%

Qts0.34 –

Vas16.7 L −49%

BL5.6 T·m +12%

Xmax4 mm −11%

Sensitivity88.1 dB +0.5

SB AcousticsSB17NRXC35-4

£58.90 · 148% more

Fs35 Hz –

Qts0.32 −6%

Vas35.2 L +8%

BL4.8 T·m −4%

Xmax5.5 mm +22%

Sensitivity88.5 dB +0.9

CIAREHWB160

£67.81 · 186% more

Fs46 Hz +31%

Qts0.36 +6%

Vas19.5 L −40%

BL6.5 T·m +30%

Xmax4.5 mm –

Sensitivity89 dB +1.4

SB AcousticsSB17NAC35-4

£72.00 · 203% more

Fs32 Hz −9%

Qts0.32 −6%

Vas33 L –

BL5.2 T·m +4%

Xmax5.5 mm +22%

Sensitivity87.1 dB −0.5

Scanspeak18W/4434G00

£72.89 · 207% more

Fs47 Hz +34%

Qts0.35 –

Vas20.7 L −37%

BL6 T·m +20%

Xmax4.3 mm −4%

Sensitivity89.7 dB +2.1

SEASH1455-08 ER15RLY

£81.26 · 242% more

Fs44 Hz +26%

Qts0.32 −6%

Vas15 L −54%

BL5.5 T·m +10%

Xmax5 mm +11%

Sensitivity87 dB −0.6

SB AcousticsSB17CRC35-4

£85.53 · 260% more

Fs32 Hz −10%

Qts0.32 −6%

Vas35.5 L +9%

BL5 T·m –

Xmax11 mm +144%

Sensitivity87 dB −0.6

SEASH1216-08 CA15RLY

£90.51 · 281% more

Fs44 Hz +26%

Qts0.34 –

Vas14 L −57%

BL5.5 T·m +10%

Xmax5 mm +11%

Sensitivity86.6 dB −1

Dayton AudioPS180-8

£90.76 · 282% more

Fs59 Hz +67%

Qts0.33 –

Vas27.6 L −16%

BL6.8 T·m +36%

Xmax4.6 mm –

Sensitivity93.9 dB +6.3

SEASH1520-08 U16RCY/P

£102.27 · 331% more

Fs36 Hz –

Qts0.32 −6%

Vas25 L −24%

BL6.3 T·m +26%

Xmax4 mm −11%

Sensitivity86.9 dB −0.7

WavecorWF152BD09

£111.20 · 369% more

Fs52 Hz +49%

Qts0.34 –

Vas8.6 L −74%

BL5.8 T·m +16%

Xmax4.5 mm –

Sensitivity87.4 dB –

WavecorWF152BD03

£144.52 · 509% more

Fs56 Hz +59%

Qts0.35 –

Vas9.2 L −72%

BL5.8 T·m +16%

Xmax4.5 mm –

Sensitivity88.4 dB +0.8

Scanspeak15W/8534T00

£156.76 · 561% more

Fs32 Hz −9%

Qts0.39 +15%

Vas30 L −8%

BL5.5 T·m +10%

Xmax5 mm +11%

Sensitivity85.6 dB −2

Tang BandW5-1880

£211.90 · 793% more

Fs48 Hz +37%

Qts0.32 −6%

Vas26.5 L −19%

BL5.5 T·m +9%

Xmax5 mm +11%

Sensitivity90.9 dB +3.3

Scanspeak18WU/4747T00

£292.38 · 1132% more

Fs36 Hz –

Qts0.35 –

Vas36 L +10%

BL5.9 T·m +18%

Xmax9 mm +100%

Sensitivity88.4 dB +0.8

AccutonC158-8-085

£330.52 · 1293% more

Fs37 Hz +6%

Qts0.36 +6%

Vas27.3 L −17%

BL7.7 T·m +54%

Xmax5 mm +11%

Sensitivity87.5 dB –

CIARECW169

No current price

Fs46 Hz +31%

Qts0.32 −6%

Vas21.2 L −35%

BL5.9 T·m +19%

Xmax5 mm +11%

Sensitivity89.3 dB +1.7

SB AcousticsSB17BAC35-8-COAX

No current price

Fs35 Hz –

Qts0.33 –

Vas33.1 L –

BL5.7 T·m +14%

Xmax3.1 mm −31%

Sensitivity88.1 dB +0.5

HiViS6N

No current price

Fs45 Hz +29%

Qts0.35 –

Vas23.4 L −28%

BL7.6 T·m +52%

Xmax4.3 mm −4%

Sensitivity89.4 dB +1.8

HiViSS6N

No current price

Fs44 Hz +26%

Qts0.36 +6%

Vas23.9 L −27%

BL7.6 T·m +52%

Xmax4.3 mm −4%

Sensitivity89.1 dB +1.5

Search similar

Tune the match

Choose the published values that matter to your design. Size stays matched to this driver.

Qts

Qes

Vas

Xmax

Reviews

How reviews work

5.0 out of 5

from 2 ratings at 1 shop

SoundImports5.0 out of 52 ratings · Checked 12 Oct 2026
Read reviews on SoundImports

Each shop collects its own ratings. Bits shows them as published and doesn't verify them.

Where to buy

Prices for delivery to the UK, including VAT. How prices work

Watch price

Shop	Price	Against the lowest	Stock	Link
Lautsprechershop Checked 12 Oct 2026 · Ships from Germany · 4 Ω · Source: inc VAT · 19% Import VAT and duty may apply	£23.73, the lowest price		Stock not listed	Visit shop at Lautsprechershop
RumoH Checked 12 Oct 2026 · Ships from Netherlands · 4 Ω · Source: inc VAT Import VAT and duty may apply	£27.41	16% above the lowest price	In stock	Visit shop at RumoH
SoundImports Checked 12 Oct 2026 · Ships from Netherlands · 4 Ω · Source: inc VAT Import VAT and duty may apply	£28.35	20% above the lowest price	2 in stock	Visit shop at SoundImports

Best price over time

Tracked since 1 Apr