SB Acoustics SB16PFCR25-4-COAX is a 6-inch 4 ohm LF driver rated at 40 W RMS. The validated T/S data includes Fs 36 Hz, Qts 0.31, Vas 31.3 L, Xmax 4.7 mm, sensitivity 88.2 dB, plus 55 cm³ Vd and 103 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 £49.62.

The published T/S values agree with each other

Thiele/Small

Fs: 36Hz
Qts: 0.31
Qes: 0.35
Qms: 2.6
Vas: 31.3L
Re: 3.2Ω
Le: 0.31mH

Motor and cone

BL: 5.1T·m
Sd: 119cm²
Mms: 13g
Xmax: 4.7mm
Vd †: 55cm³
Voice coil: 25mm
Flux density: 1.10T

Power and response

Sensitivity †: 88.2dB
Manufacturer sensitivity: 90dB
Power: 40W
Impedance: 4Ω
EBP †: 103 · Leans vented

Size and mounting

Weight: 0.95kg

Other published values

Cms: 1.56mm/N

Sensitivity shows 88.2 dB, calculated from the T/S values. SB Acoustics publishes 90.0 dB, 1.8 dB apart.

Excursion and motor values come from the LF section; the frequency range spans every section.

† Calculated by bits from the published values

What this validation status means

Components and manufacturer details

LF · Primary · 6″

BL: 5.1T·m
Fs: 36Hz
Le: 0.31mH
Re: 3.2Ω
Sd: 119cm²
Cms: 1.56mm/N
Mms: 13g
Qes: 0.35
Qms: 2.6
Qts: 0.31
SPL: 88.2dB
Vas: 31.3L
Xmax: 4.7mm
Power: 40W
Impedance: 4Ω
Flux density: 1.10T
Sensitivity: 90dB
Calculated sensitivity †: 88.2dB
Manufacturer sensitivity: 90dB
Voice coil: 25mm
Weight: 0.95kg

Compare

Same-size drivers, compared with the SB16PFCR25-4-COAX. Clear differences are green when better and red when worse.

This driverSB16PFCR25-4-COAX

Best price

£49.62

36 Hz

Qts

0.31

Vas

31.3 L

5.1 T·m

Xmax

4.7 mm

Sensitivity

88.2 dB

Power

40 W

SB AcousticsSB16PFCR25-4

£22.03 · 56% less

Fs35 Hz –

Qts0.34 +10%

Vas32.7 L +4%

BL5 T·m –

Xmax9 mm +94%

Sensitivity87.6 dB −0.6

SB AcousticsSB13PFC25-4

£23.27 · 53% less

Fs44 Hz +22%

Qts0.29 −6%

Vas13.4 L −57%

BL5.3 T·m +4%

Xmax4.5 mm −3%

Sensitivity87.4 dB −0.8

SB AcousticsSB16PFC25-4

£23.73 · 52% less

Fs35 Hz –

Qts0.34 +10%

Vas32.7 L +4%

BL5 T·m –

Xmax4.5 mm −3%

Sensitivity87.6 dB −0.6

SB AcousticsSB13PFCR25-4-COAX

£44.84 · 10% less

Fs43 Hz +19%

Qts0.27 −13%

Vas14.4 L −54%

BL5.1 T·m –

Xmax4.7 mm –

Sensitivity87.8 dB –

SB AcousticsSB13PFC25-4-COAX

£46.58 · 6% less

Fs43 Hz +19%

Qts0.27 −13%

Vas14.4 L −54%

BL5.1 T·m –

Xmax4.7 mm –

Sensitivity87.8 dB –

SB AcousticsSB16PFC25-4-COAX

£48.27 · 3% less

Fs36 Hz –

Qts0.31 –

Vas31.3 L –

BL5.1 T·m –

Xmax4.7 mm –

Sensitivity88.2 dB –

CIAREHW162

£48.31 · 3% less

Fs44 Hz +22%

Qts0.33 +6%

Vas24.8 L −21%

BL7.5 T·m +47%

Xmax4.5 mm −3%

Sensitivity89.4 dB +1.2

SB AcousticsSB15NRXC30-8

£54.80 · 10% more

Fs38 Hz +6%

Qts0.33 +6%

Vas20.7 L −34%

BL5.6 T·m +10%

Xmax5 mm +8%

Sensitivity87.1 dB −1.1

SB AcousticsSB15NRXC30-4

£54.80 · 10% more

Fs41 Hz +14%

Qts0.29 −6%

Vas16.7 L −47%

BL4.7 T·m −8%

Xmax5 mm +8%

Sensitivity87.7 dB −0.5

SB AcousticsSB17NRXC35-4

£58.90 · 19% more

Fs35 Hz –

Qts0.32 +3%

Vas35.2 L +12%

BL4.8 T·m −6%

Xmax5.5 mm +18%

Sensitivity88.5 dB –

SB AcousticsSB15NAC30-4

£70.31 · 42% more

Fs35 Hz –

Qts0.30 −3%

Vas18.3 L −42%

BL4.8 T·m −6%

Xmax5 mm +8%

Sensitivity85.9 dB −2.3

SB AcousticsSB17NAC35-4

£72.00 · 45% more

Fs32 Hz −11%

Qts0.32 +3%

Vas33 L +5%

BL5.2 T·m –

Xmax5.5 mm +18%

Sensitivity87.1 dB −1.1

Scanspeak18W/4434G00

£72.89 · 47% more

Fs47 Hz +31%

Qts0.35 +13%

Vas20.7 L −34%

BL6 T·m +18%

Xmax4.3 mm −8%

Sensitivity89.7 dB +1.5

SB AcousticsSB15CAC30-4

£76.56 · 54% more

Fs33 Hz −10%

Qts0.31 –

Vas20.2 L −35%

BL4.6 T·m −10%

Xmax10 mm +115%

Sensitivity85.1 dB −3.1

SEASH1455-08 ER15RLY

£81.26 · 64% more

Fs44 Hz +22%

Qts0.32 +3%

Vas15 L −52%

BL5.5 T·m +8%

Xmax5 mm +8%

Sensitivity87 dB −1.2

SB AcousticsSB17CRC35-4

£85.53 · 72% more

Fs32 Hz −13%

Qts0.32 +3%

Vas35.5 L +13%

BL5 T·m –

Xmax11 mm +137%

Sensitivity87 dB −1.2

Dayton AudioPS180-8

£90.76 · 83% more

Fs59 Hz +63%

Qts0.33 +6%

Vas27.6 L −12%

BL6.8 T·m +34%

Xmax4.6 mm –

Sensitivity93.9 dB +5.7

ETON7-612/C8/32 RP

£97.43 · 96% more

Fs37 Hz –

Qts0.30 −3%

Vas28 L −11%

BL8.6 T·m +69%

Xmax4.5 mm −3%

Sensitivity88.5 dB –

SEASH1520-08 U16RCY/P

£102.27 · 106% more

Fs36 Hz –

Qts0.32 +3%

Vas25 L −20%

BL6.3 T·m +24%

Xmax4 mm −14%

Sensitivity86.9 dB −1.3

CIAREHWG160

£103.41 · 108% more

Fs39 Hz +8%

Qts0.33 +6%

Vas27 L −14%

BL5.6 T·m +10%

Xmax6.5 mm +40%

Sensitivity88.6 dB –

WavecorWF152BD09

£111.20 · 124% more

Fs52 Hz +44%

Qts0.34 +10%

Vas8.6 L −73%

BL5.8 T·m +14%

Xmax4.5 mm −3%

Sensitivity87.4 dB −0.8

Tang BandW5-1880

£211.90 · 327% more

Fs48 Hz +33%

Qts0.32 +3%

Vas26.5 L −15%

BL5.5 T·m +7%

Xmax5 mm +8%

Sensitivity90.9 dB +2.7

WavecorWF182BD10

No current price

Fs29 Hz −21%

Qts0.31 –

Vas32.4 L +4%

BL6.5 T·m +27%

Xmax5.5 mm +18%

Sensitivity85.7 dB −2.5

WavecorWF182BD18

No current price

Fs29 Hz −21%

Qts0.31 –

Vas32.4 L +4%

BL6.5 T·m +27%

Xmax5.5 mm +18%

Sensitivity85.7 dB −2.5

CIARECW169

No current price

Fs46 Hz +28%

Qts0.32 +3%

Vas21.2 L −32%

BL5.9 T·m +16%

Xmax5 mm +8%

Sensitivity89.3 dB +1.1

SEASE0074-08 W18EX003

No current price

Fs32 Hz −11%

Qts0.30 −3%

Vas29 L −7%

BL8.5 T·m +67%

Xmax5 mm +8%

Sensitivity86.8 dB −1.4

Audio Technology15 J 52 15 06 SD

No current price

Fs45 Hz +25%

Qts0.32 +3%

Vas15 L −52%

BL5.5 T·m +8%

Xmax5.2 mm +12%

Sensitivity87.7 dB −0.5

SB AcousticsSB17BAC35-8-COAX

No current price

Fs35 Hz –

Qts0.33 +6%

Vas33.1 L +6%

BL5.7 T·m +12%

Xmax3.1 mm −33%

Sensitivity88.1 dB –

WavecorWF152BD10

No current price

Fs49 Hz +36%

Qts0.32 +3%

Vas9.6 L −69%

BL5.8 T·m +14%

Xmax4.5 mm −3%

Sensitivity87.4 dB −0.8

Dayton AudioPM180-8

No current price

Fs53 Hz +48%

Qts0.28 −10%

Vas28 L −11%

BL7.7 T·m +51%

Xmax4.6 mm –

Sensitivity93.5 dB +5.3

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

4.7 out of 5

from 3 ratings at 1 shop

SoundImports4.7 out of 53 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
Lean Audio Checked 12 Oct 2026 · 4 Ω · Source: inc VAT · 20%	£49.62, the lowest price		2 in stock	Visit shop at Lean Audio
Lean Business Checked 11 Oct 2026 · 4 Ω · Source: inc VAT · 20%	£49.62		Stock not listed	Visit shop at Lean Business
Willys-Hifi Checked 12 Oct 2026 · 4 Ω · Source: ex VAT · 20%	£61.82	25% above the lowest price	Stock not listed	Visit shop at Willys-Hifi
RumoH Checked 12 Oct 2026 · Ships from Netherlands · 4 Ω · Source: inc VAT Import VAT and duty may apply	£52.31	5.4% above the lowest price	Stock not listed	Visit shop at RumoH
SoundImports Checked 12 Oct 2026 · Ships from Netherlands · 4 Ω · Source: inc VAT Import VAT and duty may apply	£55.05	11% above the lowest price	26 in stock	Visit shop at SoundImports

Best price over time

Tracked since 1 Apr

Recent changes

1 OctWillys-Hifi£63.95 → £61.82Down 3.3% from £63.95
28 SepWillys-Hifi£62.95 → £63.95Up 1.6% from £62.95
27 SepWillys-Hifi£63.95 → £62.95Down 1.6% from £63.95

bits00 AUDIO

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

SB Acoustics SB16PFCR25-4-COAX 4Ω

4 Ω

3 ratings at 1 shop

£49.62

Steady

7.6% below the average of 3 shops

Lean Audio · 2 in stock · All 5 offers

Open in 00 Simulator

Fs: 36Hz
Xmax: 4.7mm
SPL: 88dB
Pe: 40W
BL: 5.1T·m
Vd: 55cm³
Qts: 0.31
Vas: 31L

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: 36Hz
Qts: 0.31
Qes: 0.35
Qms: 2.6
Vas: 31.3L
Re: 3.2Ω
Le: 0.31mH

Motor and cone

BL: 5.1T·m
Sd: 119cm²
Mms: 13g
Xmax: 4.7mm
Vd †: 55cm³
Voice coil: 25mm
Flux density: 1.10T

Power and response

Sensitivity †: 88.2dB
Manufacturer sensitivity: 90dB
Power: 40W
Impedance: 4Ω
EBP †: 103 · Leans vented

Size and mounting

Weight: 0.95kg

Other published values

Cms: 1.56mm/N

Sensitivity shows 88.2 dB, calculated from the T/S values. SB Acoustics publishes 90.0 dB, 1.8 dB apart.

Excursion and motor values come from the LF section; the frequency range spans every section.

† Calculated by bits from the published values

What this validation status means

Components and manufacturer details

LF · Primary · 6″

BL: 5.1T·m
Fs: 36Hz
Le: 0.31mH
Re: 3.2Ω
Sd: 119cm²
Cms: 1.56mm/N
Mms: 13g
Qes: 0.35
Qms: 2.6
Qts: 0.31
SPL: 88.2dB
Vas: 31.3L
Xmax: 4.7mm
Power: 40W
Impedance: 4Ω
Flux density: 1.10T
Sensitivity: 90dB
Calculated sensitivity †: 88.2dB
Manufacturer sensitivity: 90dB
Voice coil: 25mm
Weight: 0.95kg

Compare

Same-size drivers, compared with the SB16PFCR25-4-COAX. Clear differences are green when better and red when worse.

This driverSB16PFCR25-4-COAX

Best price

£49.62

36 Hz

Qts

0.31

Vas

31.3 L

5.1 T·m

Xmax

4.7 mm

Sensitivity

88.2 dB

Power

40 W

SB AcousticsSB16PFCR25-4

£22.03 · 56% less

Fs35 Hz –

Qts0.34 +10%

Vas32.7 L +4%

BL5 T·m –

Xmax9 mm +94%

Sensitivity87.6 dB −0.6

SB AcousticsSB13PFC25-4

£23.27 · 53% less

Fs44 Hz +22%

Qts0.29 −6%

Vas13.4 L −57%

BL5.3 T·m +4%

Xmax4.5 mm −3%

Sensitivity87.4 dB −0.8

SB AcousticsSB16PFC25-4

£23.73 · 52% less

Fs35 Hz –

Qts0.34 +10%

Vas32.7 L +4%

BL5 T·m –

Xmax4.5 mm −3%

Sensitivity87.6 dB −0.6

SB AcousticsSB13PFCR25-4-COAX

£44.84 · 10% less

Fs43 Hz +19%

Qts0.27 −13%

Vas14.4 L −54%

BL5.1 T·m –

Xmax4.7 mm –

Sensitivity87.8 dB –

SB AcousticsSB13PFC25-4-COAX

£46.58 · 6% less

Fs43 Hz +19%

Qts0.27 −13%

Vas14.4 L −54%

BL5.1 T·m –

Xmax4.7 mm –

Sensitivity87.8 dB –

SB AcousticsSB16PFC25-4-COAX

£48.27 · 3% less

Fs36 Hz –

Qts0.31 –

Vas31.3 L –

BL5.1 T·m –

Xmax4.7 mm –

Sensitivity88.2 dB –

CIAREHW162

£48.31 · 3% less

Fs44 Hz +22%

Qts0.33 +6%

Vas24.8 L −21%

BL7.5 T·m +47%

Xmax4.5 mm −3%

Sensitivity89.4 dB +1.2

SB AcousticsSB15NRXC30-8

£54.80 · 10% more

Fs38 Hz +6%

Qts0.33 +6%

Vas20.7 L −34%

BL5.6 T·m +10%

Xmax5 mm +8%

Sensitivity87.1 dB −1.1

SB AcousticsSB15NRXC30-4

£54.80 · 10% more

Fs41 Hz +14%

Qts0.29 −6%

Vas16.7 L −47%

BL4.7 T·m −8%

Xmax5 mm +8%

Sensitivity87.7 dB −0.5

SB AcousticsSB17NRXC35-4

£58.90 · 19% more

Fs35 Hz –

Qts0.32 +3%

Vas35.2 L +12%

BL4.8 T·m −6%

Xmax5.5 mm +18%

Sensitivity88.5 dB –

SB AcousticsSB15NAC30-4

£70.31 · 42% more

Fs35 Hz –

Qts0.30 −3%

Vas18.3 L −42%

BL4.8 T·m −6%

Xmax5 mm +8%

Sensitivity85.9 dB −2.3

SB AcousticsSB17NAC35-4

£72.00 · 45% more

Fs32 Hz −11%

Qts0.32 +3%

Vas33 L +5%

BL5.2 T·m –

Xmax5.5 mm +18%

Sensitivity87.1 dB −1.1

Scanspeak18W/4434G00

£72.89 · 47% more

Fs47 Hz +31%

Qts0.35 +13%

Vas20.7 L −34%

BL6 T·m +18%

Xmax4.3 mm −8%

Sensitivity89.7 dB +1.5

SB AcousticsSB15CAC30-4

£76.56 · 54% more

Fs33 Hz −10%

Qts0.31 –

Vas20.2 L −35%

BL4.6 T·m −10%

Xmax10 mm +115%

Sensitivity85.1 dB −3.1

SEASH1455-08 ER15RLY

£81.26 · 64% more

Fs44 Hz +22%

Qts0.32 +3%

Vas15 L −52%

BL5.5 T·m +8%

Xmax5 mm +8%

Sensitivity87 dB −1.2

SB AcousticsSB17CRC35-4

£85.53 · 72% more

Fs32 Hz −13%

Qts0.32 +3%

Vas35.5 L +13%

BL5 T·m –

Xmax11 mm +137%

Sensitivity87 dB −1.2

Dayton AudioPS180-8

£90.76 · 83% more

Fs59 Hz +63%

Qts0.33 +6%

Vas27.6 L −12%

BL6.8 T·m +34%

Xmax4.6 mm –

Sensitivity93.9 dB +5.7

ETON7-612/C8/32 RP

£97.43 · 96% more

Fs37 Hz –

Qts0.30 −3%

Vas28 L −11%

BL8.6 T·m +69%

Xmax4.5 mm −3%

Sensitivity88.5 dB –

SEASH1520-08 U16RCY/P

£102.27 · 106% more

Fs36 Hz –

Qts0.32 +3%

Vas25 L −20%

BL6.3 T·m +24%

Xmax4 mm −14%

Sensitivity86.9 dB −1.3

CIAREHWG160

£103.41 · 108% more

Fs39 Hz +8%

Qts0.33 +6%

Vas27 L −14%

BL5.6 T·m +10%

Xmax6.5 mm +40%

Sensitivity88.6 dB –

WavecorWF152BD09

£111.20 · 124% more

Fs52 Hz +44%

Qts0.34 +10%

Vas8.6 L −73%

BL5.8 T·m +14%

Xmax4.5 mm −3%

Sensitivity87.4 dB −0.8

Tang BandW5-1880

£211.90 · 327% more

Fs48 Hz +33%

Qts0.32 +3%

Vas26.5 L −15%

BL5.5 T·m +7%

Xmax5 mm +8%

Sensitivity90.9 dB +2.7

WavecorWF182BD10

No current price

Fs29 Hz −21%

Qts0.31 –

Vas32.4 L +4%

BL6.5 T·m +27%

Xmax5.5 mm +18%

Sensitivity85.7 dB −2.5

WavecorWF182BD18

No current price

Fs29 Hz −21%

Qts0.31 –

Vas32.4 L +4%

BL6.5 T·m +27%

Xmax5.5 mm +18%

Sensitivity85.7 dB −2.5

CIARECW169

No current price

Fs46 Hz +28%

Qts0.32 +3%

Vas21.2 L −32%

BL5.9 T·m +16%

Xmax5 mm +8%

Sensitivity89.3 dB +1.1

SEASE0074-08 W18EX003

No current price

Fs32 Hz −11%

Qts0.30 −3%

Vas29 L −7%

BL8.5 T·m +67%

Xmax5 mm +8%

Sensitivity86.8 dB −1.4

Audio Technology15 J 52 15 06 SD

No current price

Fs45 Hz +25%

Qts0.32 +3%

Vas15 L −52%

BL5.5 T·m +8%

Xmax5.2 mm +12%

Sensitivity87.7 dB −0.5

SB AcousticsSB17BAC35-8-COAX

No current price

Fs35 Hz –

Qts0.33 +6%

Vas33.1 L +6%

BL5.7 T·m +12%

Xmax3.1 mm −33%

Sensitivity88.1 dB –

WavecorWF152BD10

No current price

Fs49 Hz +36%

Qts0.32 +3%

Vas9.6 L −69%

BL5.8 T·m +14%

Xmax4.5 mm −3%

Sensitivity87.4 dB −0.8

Dayton AudioPM180-8

No current price

Fs53 Hz +48%

Qts0.28 −10%

Vas28 L −11%

BL7.7 T·m +51%

Xmax4.6 mm –

Sensitivity93.5 dB +5.3

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

4.7 out of 5

from 3 ratings at 1 shop

SoundImports4.7 out of 53 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
Lean Audio Checked 12 Oct 2026 · 4 Ω · Source: inc VAT · 20%	£49.62, the lowest price		2 in stock	Visit shop at Lean Audio
Lean Business Checked 11 Oct 2026 · 4 Ω · Source: inc VAT · 20%	£49.62		Stock not listed	Visit shop at Lean Business
Willys-Hifi Checked 12 Oct 2026 · 4 Ω · Source: ex VAT · 20%	£61.82	25% above the lowest price	Stock not listed	Visit shop at Willys-Hifi
RumoH Checked 12 Oct 2026 · Ships from Netherlands · 4 Ω · Source: inc VAT Import VAT and duty may apply	£52.31	5.4% above the lowest price	Stock not listed	Visit shop at RumoH
SoundImports Checked 12 Oct 2026 · Ships from Netherlands · 4 Ω · Source: inc VAT Import VAT and duty may apply	£55.05	11% above the lowest price	26 in stock	Visit shop at SoundImports

Best price over time

Tracked since 1 Apr

Recent changes

1 OctWillys-Hifi£63.95 → £61.82Down 3.3% from £63.95
28 SepWillys-Hifi£62.95 → £63.95Up 1.6% from £62.95
27 SepWillys-Hifi£63.95 → £62.95Down 1.6% from £63.95