4-inch LF driver · FE series · 40 W

FaitalPRO 4FE42 4Ω

Name: FaitalPRO 4FE42 4 Ohm
Brand: FaitalPRO
SKU: 4FE42
Availability: InStock

100–20000 Hz

£29.42

Steady

Blue Aran · 14 in stock · All 5 offers

Open in 00 Simulator

Fs: 110Hz
Xmax: 2.8mm
SPL: 90dB
Pe: 40W
BL: 5.4T·m
Vd: 14cm³
Qts: 0.38
Vas: 2L

See all 25 specs

Curve provenanceInspect 3 traces

These plotted lines are Bits digitizations of manufacturer evidence, not new measurements. How provenance works

0 degrees
Frequency response
Trace datasheet-response-trace-poc/v2
155 plotted pointsSource file SHA-256 edba87b789be…Medium confidence412 selected pixels of 486
Manufacturer datasheet, page 1
45 degrees
Frequency response
Trace datasheet-response-trace-poc/v2
240 plotted pointsSource file SHA-256 edba87b789be…Medium confidence1,031 selected pixels of 1,031
Manufacturer datasheet, page 1
impedance
Impedance response
Trace datasheet-response-trace-poc/v2
240 plotted pointsSource file SHA-256 edba87b789be…Medium confidence1,324 selected pixels of 1,324
Manufacturer datasheet, page 1

Specifications

Published by FaitalPRO

Manufacturer page

Datasheet PDF

FaitalPRO 4FE42 is a 4-inch 4 ohm LF driver rated at 40 W RMS. The validated T/S data includes Fs 110 Hz, Qts 0.38, Vas 1.8 L, Xmax 2.8 mm, sensitivity 89.8 dB, plus 14 cm³ Vd and 275 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 £29.42.

The published T/S values agree with each other

Thiele/Small

Fs: 110Hz
Qts: 0.38
Qes: 0.40
Qms: 6.6
Vas: 1.8L
Re: 3.5Ω
Le: 0.05mH

Motor and cone

BL: 5.4T·m
Sd: 51cm²
Mms: 4g
Xmax: 2.8mm
Vd †: 14cm³

Power and response

Sensitivity †: 89.8dB
Manufacturer sensitivity: 93dB
Power: 40W
Impedance: 4Ω
Range: 100–20000Hz
EBP †: 275 · Leans vented

Size and mounting

Diameter: 129.8mm
Cutout: 91.5mm
Bolt circle: 115.3mm
Depth: 54.1mm

Other published values

Cms: 0.49mm/N
Rms: 0.50kg/s
Power Program: 80

Sensitivity shows 89.8 dB, calculated from the T/S values. FaitalPRO publishes 93.0 dB, 3.2 dB apart.

† Calculated by bits from the published values

What this validation status means

Everything else FaitalPRO lists

LF · Primary · 4″

BL: 5.4T·m
Fs: 110Hz
Le: 0.05mH
Re: 3.5Ω
Sd: 51cm²
Cms: 0.49mm/N
Mms: 4g
Qes: 0.40
Qms: 6.6
Qts: 0.38
Rms: 0.50kg/s
SPL: 89.8dB
Vas: 1.8L
Xmax: 2.8mm
Power: 40W
Impedance: 4Ω
Sensitivity: 93dB
Low limit: 100Hz
Power Program: 80
Calculated sensitivity †: 89.8dB
High limit: 20000Hz
Manufacturer sensitivity: 93dB
Diameter: 129.8mm
Depth: 54.1mm
Cutout: 91.5mm
Bolt circle: 115.3mm

Compare

Same-size drivers, compared with the 4FE42. Clear differences are green when better and red when worse.

This driver4FE42

Best price

£29.42

110 Hz

Qts

0.38

Vas

1.8 L

5.4 T·m

Xmax

2.8 mm

Sensitivity

89.8 dB

Power

40 W

REDCATT35FR-1

£13.03 · 56% less

Fs67 Hz −39%

Qts0.34 −11%

Vas1.6 L −11%

BL5.5 T·m –

Xmax0.55 mm −81%

Sensitivity83.2 dB −6.6

Dayton AudioDSA90-8

£20.11 · 32% less

Fs67 Hz −39%

Qts0.37 –

Vas2.3 L +26%

BL4.6 T·m −15%

Xmax2.5 mm −12%

Sensitivity83.8 dB −6

Sica4 E 1 CS

£23.82 · 19% less

Fs118 Hz +7%

Qts0.39 –

Vas1.3 L −28%

BL5.8 T·m +7%

Xmax2.2 mm −22%

Sensitivity88.4 dB −1.4

REDCATT41NFR

£29.84 · 1% more

Fs98 Hz −11%

Qts0.37 –

Vas2.1 L +17%

BL10 T·m +85%

Xmax3.1 mm +11%

Sensitivity89 dB −0.8

Tang BandW3-881SJF

£30.09 · 2% more

Fs100 Hz −9%

Qts0.39 –

Vas1.9 L +5%

BL4.5 T·m −17%

Xmax0.5 mm −82%

Sensitivity88.7 dB −1.1

MonacorSP-100/8

£31.09 · 6% more

Fs61 Hz −45%

Qts0.37 –

Vas4.7 L +161%

BL5.5 T·m –

Xmax2.5 mm −12%

Sensitivity85.9 dB −3.9

LavoceFSN041.00

£34.72 · 18% more

Fs114 Hz +4%

Qts0.38 –

Vas1.8 L –

BL6.9 T·m +27%

Xmax2.2 mm −22%

Sensitivity90 dB –

Sica4 L1 1 SL

£38.86 · 32% more

Fs120 Hz +9%

Qts0.36 −5%

Vas1.2 L −33%

BL6.2 T·m +14%

Xmax2.5 mm −12%

Sensitivity88.8 dB −1

SB AcousticsSB12NRX25-8

£51.78 · 76% more

Fs57 Hz −48%

Qts0.37 –

Vas5.3 L +194%

BL5.4 T·m –

Xmax5 mm +77%

Sensitivity85.8 dB −4

Scanspeak12W/8524G00

£54.33 · 85% more

Fs52 Hz −53%

Qts0.32 −16%

Vas8.2 L +356%

BL5.4 T·m –

Xmax3 mm +6%

Sensitivity87.2 dB −2.6

Tang BandW4-1320SIF

£57.67 · 96% more

Fs75 Hz −32%

Qts0.36 −5%

Vas5.2 L +191%

BL5.3 T·m –

Xmax3 mm +6%

Sensitivity89.2 dB −0.6

Tang BandW4-2142

£57.67 · 96% more

Fs60 Hz −45%

Qts0.33 −13%

Vas6.4 L +256%

BL5.4 T·m –

Xmax2.4 mm −15%

Sensitivity87.5 dB −2.3

Tang BandW4-2414

£66.78 · 127% more

Fs65 Hz −41%

Qts0.40 +5%

Vas3.9 L +115%

BL5.5 T·m –

Xmax2.5 mm −12%

Sensitivity85.6 dB −4.2

Tang BandW4-1337SDF

£71.04 · 141% more

Fs70 Hz −36%

Qts0.34 −11%

Vas5.6 L +212%

BL5.3 T·m –

Xmax2.5 mm −12%

Sensitivity88.9 dB −0.9

WavecorWF118WA01

£76.31 · 159% more

Fs64 Hz −42%

Qts0.36 −5%

Vas4.3 L +139%

BL4.6 T·m −15%

Xmax3 mm +6%

Sensitivity86.8 dB −3

Scanspeak10F/8424G00

£83.58 · 184% more

Fs90 Hz −18%

Qts0.37 –

Vas2.1 L +17%

BL4.8 T·m −11%

Xmax2.6 mm −8%

Sensitivity87.8 dB −2

WavecorWF120BD11

£87.19 · 196% more

Fs58 Hz −47%

Qts0.39 –

Vas3.8 L +111%

BL4.2 T·m −22%

Xmax3 mm +6%

Sensitivity84.7 dB −5.1

Tang BandW5-2143

£112.83 · 284% more

Fs55 Hz −50%

Qts0.38 –

Vas19 L +956%

BL5.4 T·m –

Xmax2.5 mm −12%

Sensitivity90.7 dB +0.9

SEASE0044-08S W12CY003

£200.54 · 582% more

Fs60 Hz −45%

Qts0.36 −5%

Vas4 L +122%

BL5.5 T·m –

Xmax3 mm +6%

Sensitivity85 dB −4.8

Scanspeak12M/4631G00

£242.33 · 724% more

Fs75 Hz −32%

Qts0.33 −13%

Vas2.3 L +28%

BL5.3 T·m –

Xmax3 mm +6%

Sensitivity86.5 dB −3.3

SEASE0021-08S W12CY001

£334.27 · 1036% more

Fs45 Hz −59%

Qts0.36 −5%

Vas6 L +233%

BL5.4 T·m –

Xmax3 mm +6%

Sensitivity83.2 dB −6.6

SEASE0070-08 W12CY004

£376.06 · 1178% more

Fs48 Hz −56%

Qts0.38 –

Vas4.6 L +156%

BL5.9 T·m +9%

Xmax3 mm +6%

Sensitivity83 dB −6.8

SB AcousticsSB15BAC30-8-COAX

No current price

Fs43 Hz −61%

Qts0.36 −5%

Vas17.5 L +872%

BL5.3 T·m –

Xmax3 mm +6%

Sensitivity87.6 dB −2.2

Tang BandW4-1320SJF

No current price

Fs75 Hz −32%

Qts0.38 –

Vas5.2 L +191%

BL5.1 T·m −5%

Xmax3 mm +6%

Sensitivity88.9 dB −0.9

WavecorWF120BD12

No current price

Fs57 Hz −49%

Qts0.38 –

Vas3.9 L +117%

BL4.2 T·m −22%

Xmax3 mm +6%

Sensitivity84.5 dB −5.3

Tang BandW4-1320SI

No current price

Fs75 Hz −32%

Qts0.38 –

Vas5.2 L +191%

BL5.1 T·m −5%

Xmax3 mm +6%

Sensitivity88.7 dB −1.1

Tang BandW3-1401SD

No current price

Fs75 Hz −32%

Qts0.31 −18%

Vas1.6 L −8%

BL5.6 T·m –

Xmax3.5 mm +24%

Sensitivity84.7 dB −5.1

Tang BandW4-1337SD

No current price

Fs70 Hz −36%

Qts0.37 –

Vas4.9 L +170%

BL5.4 T·m –

Xmax3 mm +6%

Sensitivity87.3 dB −2.5

CIARENDI3.21

No current price

Fs90 Hz −18%

Qts0.38 –

Vas1.8 L –

BL4 T·m −26%

Xmax2 mm −29%

Sensitivity86.8 dB −3

Tang BandW4-1129E

No current price

Fs120 Hz +9%

Qts0.44 +16%

Vas1.7 L −4%

BL5.2 T·m −4%

Xmax1.8 mm −36%

Sensitivity90.1 dB –

Search similar

Tune the match

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

Qts

Qes

Vas

Xmax

Where to buy

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

Watch price

Shop	Price	Against the lowest	Stock	Link
Blue Aran Checked 4 Nov 2026 · 4 Ω · Source: inc VAT · 20%	£29.42, the lowest price		14 in stock	Visit shop at Blue Aran
Lean Audio Checked 4 Nov 2026 · 4 Ω · Source: inc VAT · 20%	£28.50		Back order	Visit shop at Lean Audio
SoundImports Checked 4 Nov 2026 · Ships from Netherlands · 4 Ω · Source: inc VAT Import VAT and duty may apply	£40.08	36% above the lowest price	15 in stock	Visit shop at SoundImports

Best price over time

Tracked since 1 Apr

bits00 AUDIO

4-inch LF driver · FE series · 40 W

FaitalPRO 4FE42 4Ω

100–20000 Hz

£29.42

Steady

Blue Aran · 14 in stock · All 5 offers

Open in 00 Simulator

Fs: 110Hz
Xmax: 2.8mm
SPL: 90dB
Pe: 40W
BL: 5.4T·m
Vd: 14cm³
Qts: 0.38
Vas: 2L

See all 25 specs

Curve provenanceInspect 3 traces

These plotted lines are Bits digitizations of manufacturer evidence, not new measurements. How provenance works

0 degrees
Frequency response
Trace datasheet-response-trace-poc/v2
155 plotted pointsSource file SHA-256 edba87b789be…Medium confidence412 selected pixels of 486
Manufacturer datasheet, page 1
45 degrees
Frequency response
Trace datasheet-response-trace-poc/v2
240 plotted pointsSource file SHA-256 edba87b789be…Medium confidence1,031 selected pixels of 1,031
Manufacturer datasheet, page 1
impedance
Impedance response
Trace datasheet-response-trace-poc/v2
240 plotted pointsSource file SHA-256 edba87b789be…Medium confidence1,324 selected pixels of 1,324
Manufacturer datasheet, page 1

Specifications

Published by FaitalPRO

Manufacturer page

Datasheet PDF

The published T/S values agree with each other

Thiele/Small

Fs: 110Hz
Qts: 0.38
Qes: 0.40
Qms: 6.6
Vas: 1.8L
Re: 3.5Ω
Le: 0.05mH

Motor and cone

BL: 5.4T·m
Sd: 51cm²
Mms: 4g
Xmax: 2.8mm
Vd †: 14cm³

Power and response

Sensitivity †: 89.8dB
Manufacturer sensitivity: 93dB
Power: 40W
Impedance: 4Ω
Range: 100–20000Hz
EBP †: 275 · Leans vented

Size and mounting

Diameter: 129.8mm
Cutout: 91.5mm
Bolt circle: 115.3mm
Depth: 54.1mm

Other published values

Cms: 0.49mm/N
Rms: 0.50kg/s
Power Program: 80

Sensitivity shows 89.8 dB, calculated from the T/S values. FaitalPRO publishes 93.0 dB, 3.2 dB apart.

† Calculated by bits from the published values

What this validation status means

Everything else FaitalPRO lists

LF · Primary · 4″

BL: 5.4T·m
Fs: 110Hz
Le: 0.05mH
Re: 3.5Ω
Sd: 51cm²
Cms: 0.49mm/N
Mms: 4g
Qes: 0.40
Qms: 6.6
Qts: 0.38
Rms: 0.50kg/s
SPL: 89.8dB
Vas: 1.8L
Xmax: 2.8mm
Power: 40W
Impedance: 4Ω
Sensitivity: 93dB
Low limit: 100Hz
Power Program: 80
Calculated sensitivity †: 89.8dB
High limit: 20000Hz
Manufacturer sensitivity: 93dB
Diameter: 129.8mm
Depth: 54.1mm
Cutout: 91.5mm
Bolt circle: 115.3mm

Compare

Same-size drivers, compared with the 4FE42. Clear differences are green when better and red when worse.

This driver4FE42

Best price

£29.42

110 Hz

Qts

0.38

Vas

1.8 L

5.4 T·m

Xmax

2.8 mm

Sensitivity

89.8 dB

Power

40 W

REDCATT35FR-1

£13.03 · 56% less

Fs67 Hz −39%

Qts0.34 −11%

Vas1.6 L −11%

BL5.5 T·m –

Xmax0.55 mm −81%

Sensitivity83.2 dB −6.6

Dayton AudioDSA90-8

£20.11 · 32% less

Fs67 Hz −39%

Qts0.37 –

Vas2.3 L +26%

BL4.6 T·m −15%

Xmax2.5 mm −12%

Sensitivity83.8 dB −6

Sica4 E 1 CS

£23.82 · 19% less

Fs118 Hz +7%

Qts0.39 –

Vas1.3 L −28%

BL5.8 T·m +7%

Xmax2.2 mm −22%

Sensitivity88.4 dB −1.4

REDCATT41NFR

£29.84 · 1% more

Fs98 Hz −11%

Qts0.37 –

Vas2.1 L +17%

BL10 T·m +85%

Xmax3.1 mm +11%

Sensitivity89 dB −0.8

Tang BandW3-881SJF

£30.09 · 2% more

Fs100 Hz −9%

Qts0.39 –

Vas1.9 L +5%

BL4.5 T·m −17%

Xmax0.5 mm −82%

Sensitivity88.7 dB −1.1

MonacorSP-100/8

£31.09 · 6% more

Fs61 Hz −45%

Qts0.37 –

Vas4.7 L +161%

BL5.5 T·m –

Xmax2.5 mm −12%

Sensitivity85.9 dB −3.9

LavoceFSN041.00

£34.72 · 18% more

Fs114 Hz +4%

Qts0.38 –

Vas1.8 L –

BL6.9 T·m +27%

Xmax2.2 mm −22%

Sensitivity90 dB –

Sica4 L1 1 SL

£38.86 · 32% more

Fs120 Hz +9%

Qts0.36 −5%

Vas1.2 L −33%

BL6.2 T·m +14%

Xmax2.5 mm −12%

Sensitivity88.8 dB −1

SB AcousticsSB12NRX25-8

£51.78 · 76% more

Fs57 Hz −48%

Qts0.37 –

Vas5.3 L +194%

BL5.4 T·m –

Xmax5 mm +77%

Sensitivity85.8 dB −4

Scanspeak12W/8524G00

£54.33 · 85% more

Fs52 Hz −53%

Qts0.32 −16%

Vas8.2 L +356%

BL5.4 T·m –

Xmax3 mm +6%

Sensitivity87.2 dB −2.6

Tang BandW4-1320SIF

£57.67 · 96% more

Fs75 Hz −32%

Qts0.36 −5%

Vas5.2 L +191%

BL5.3 T·m –

Xmax3 mm +6%

Sensitivity89.2 dB −0.6

Tang BandW4-2142

£57.67 · 96% more

Fs60 Hz −45%

Qts0.33 −13%

Vas6.4 L +256%

BL5.4 T·m –

Xmax2.4 mm −15%

Sensitivity87.5 dB −2.3

Tang BandW4-2414

£66.78 · 127% more

Fs65 Hz −41%

Qts0.40 +5%

Vas3.9 L +115%

BL5.5 T·m –

Xmax2.5 mm −12%

Sensitivity85.6 dB −4.2

Tang BandW4-1337SDF

£71.04 · 141% more

Fs70 Hz −36%

Qts0.34 −11%

Vas5.6 L +212%

BL5.3 T·m –

Xmax2.5 mm −12%

Sensitivity88.9 dB −0.9

WavecorWF118WA01

£76.31 · 159% more

Fs64 Hz −42%

Qts0.36 −5%

Vas4.3 L +139%

BL4.6 T·m −15%

Xmax3 mm +6%

Sensitivity86.8 dB −3

Scanspeak10F/8424G00

£83.58 · 184% more

Fs90 Hz −18%

Qts0.37 –

Vas2.1 L +17%

BL4.8 T·m −11%

Xmax2.6 mm −8%

Sensitivity87.8 dB −2

WavecorWF120BD11

£87.19 · 196% more

Fs58 Hz −47%

Qts0.39 –

Vas3.8 L +111%

BL4.2 T·m −22%

Xmax3 mm +6%

Sensitivity84.7 dB −5.1

Tang BandW5-2143

£112.83 · 284% more

Fs55 Hz −50%

Qts0.38 –

Vas19 L +956%

BL5.4 T·m –

Xmax2.5 mm −12%

Sensitivity90.7 dB +0.9

SEASE0044-08S W12CY003

£200.54 · 582% more

Fs60 Hz −45%

Qts0.36 −5%

Vas4 L +122%

BL5.5 T·m –

Xmax3 mm +6%

Sensitivity85 dB −4.8

Scanspeak12M/4631G00

£242.33 · 724% more

Fs75 Hz −32%

Qts0.33 −13%

Vas2.3 L +28%

BL5.3 T·m –

Xmax3 mm +6%

Sensitivity86.5 dB −3.3

SEASE0021-08S W12CY001

£334.27 · 1036% more

Fs45 Hz −59%

Qts0.36 −5%

Vas6 L +233%

BL5.4 T·m –

Xmax3 mm +6%

Sensitivity83.2 dB −6.6

SEASE0070-08 W12CY004

£376.06 · 1178% more

Fs48 Hz −56%

Qts0.38 –

Vas4.6 L +156%

BL5.9 T·m +9%

Xmax3 mm +6%

Sensitivity83 dB −6.8

SB AcousticsSB15BAC30-8-COAX

No current price

Fs43 Hz −61%

Qts0.36 −5%

Vas17.5 L +872%

BL5.3 T·m –

Xmax3 mm +6%

Sensitivity87.6 dB −2.2

Tang BandW4-1320SJF

No current price

Fs75 Hz −32%

Qts0.38 –

Vas5.2 L +191%

BL5.1 T·m −5%

Xmax3 mm +6%

Sensitivity88.9 dB −0.9

WavecorWF120BD12

No current price

Fs57 Hz −49%

Qts0.38 –

Vas3.9 L +117%

BL4.2 T·m −22%

Xmax3 mm +6%

Sensitivity84.5 dB −5.3

Tang BandW4-1320SI

No current price

Fs75 Hz −32%

Qts0.38 –

Vas5.2 L +191%

BL5.1 T·m −5%

Xmax3 mm +6%

Sensitivity88.7 dB −1.1

Tang BandW3-1401SD

No current price

Fs75 Hz −32%

Qts0.31 −18%

Vas1.6 L −8%

BL5.6 T·m –

Xmax3.5 mm +24%

Sensitivity84.7 dB −5.1

Tang BandW4-1337SD

No current price

Fs70 Hz −36%

Qts0.37 –

Vas4.9 L +170%

BL5.4 T·m –

Xmax3 mm +6%

Sensitivity87.3 dB −2.5

CIARENDI3.21

No current price

Fs90 Hz −18%

Qts0.38 –

Vas1.8 L –

BL4 T·m −26%

Xmax2 mm −29%

Sensitivity86.8 dB −3

Tang BandW4-1129E

No current price

Fs120 Hz +9%

Qts0.44 +16%

Vas1.7 L −4%

BL5.2 T·m −4%

Xmax1.8 mm −36%

Sensitivity90.1 dB –

Search similar

Tune the match

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

Qts

Qes

Vas

Xmax

Where to buy

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

Watch price

Shop	Price	Against the lowest	Stock	Link
Blue Aran Checked 4 Nov 2026 · 4 Ω · Source: inc VAT · 20%	£29.42, the lowest price		14 in stock	Visit shop at Blue Aran
Lean Audio Checked 4 Nov 2026 · 4 Ω · Source: inc VAT · 20%	£28.50		Back order	Visit shop at Lean Audio
SoundImports Checked 4 Nov 2026 · Ships from Netherlands · 4 Ω · Source: inc VAT Import VAT and duty may apply	£40.08	36% above the lowest price	15 in stock	Visit shop at SoundImports

Best price over time

Tracked since 1 Apr