4-inch LF driver · ALPHA series · 55 W

Eminence ALPHA 4-8 8Ω

Name: Eminence ALPHA 4-8 8 Ohm
Brand: Eminence
SKU: ALPHA 4-8

8 Ω · 105–12000 Hz

No price for delivery to the UK

All 2 offers

Open in 00 Simulator

Fs: 123Hz
Xmax: 2.6mm
SPL: 88dB
Pe: 55W
BL: 4.9T·m
Vd: 15cm³
Qts: 0.75
Vas: 2L

See all 26 specs

Specifications

Published by Eminence

Manufacturer page

Datasheet PDF

Eminence ALPHA 4-8 is a 4-inch 8 ohm LF driver rated at 55 W RMS. The validated T/S data includes Fs 123 Hz, Qts 0.75, Vas 1.9 L, Xmax 2.6 mm, sensitivity 88.4 dB, plus 15 cm³ Vd and 146 EBP. bits tracks vendor pricing, datasheet links, simulator import data, and similar drivers from the same loudspeaker database.

The published T/S values agree with each other

Thiele/Small

Fs: 123Hz
Qts: 0.75
Qes: 0.84
Qms: 6.8
Vas: 1.9L
Re: 6.7Ω
Le: 0.28mH

Motor and cone

BL: 4.9T·m
Sd: 58cm²
Mms: 4g
Xmax: 2.6mm
Vd †: 15cm³

Power and response

Sensitivity †: 88.4dB
Manufacturer sensitivity: 88dB
Power: 55W
Impedance: 8Ω
Range: 105–12000Hz
EBP †: 146 · Leans vented

Size and mounting

Diameter: 116.1mm
Cutout: 95.8mm
Bolt circle: 108.0mm
Depth: 58.7mm
Weight: 0.7kg

Other published values

Cms: 0.42mm/N
Xmech: 4.5
Power Program: 110

† Calculated by bits from the published values

What this validation status means

Everything else Eminence lists

LF · Primary · 4″

BL: 4.9T·m
Fs: 123Hz
Le: 0.28mH
Re: 6.7Ω
Sd: 58cm²
Cms: 0.42mm/N
Mms: 4g
Qes: 0.84
Qms: 6.8
Qts: 0.75
SPL: 88.4dB
Vas: 1.9L
Xmax: 2.6mm
Xmech: 4.5
Power: 55W
Impedance: 8Ω
Sensitivity: 88dB
Low limit: 105Hz
Power Program: 110
Calculated sensitivity †: 88.4dB
High limit: 12000Hz
Manufacturer sensitivity: 88dB
Weight: 0.7kg
Diameter: 116.1mm
Depth: 58.7mm
Cutout: 95.8mm
Bolt circle: 108.0mm

Compare

Same-size drivers, compared with the ALPHA 4-8. Clear differences are green when better and red when worse.

This driverALPHA 4-8

Best price

–

123 Hz

Qts

0.75

Vas

1.9 L

4.9 T·m

Xmax

2.6 mm

Sensitivity

88.4 dB

Power

55 W

Dayton AudioPCS115-4

£9.71

Fs88 Hz −28%

Qts0.79 +5%

Vas1.8 L −9%

BL3.6 T·m −27%

Xmax2.8 mm +6%

Sensitivity82.6 dB −5.8

REDCATT4FR-1

£11.96

Fs79 Hz −36%

Qts0.52 −31%

Vas1.8 L −7%

BL4.8 T·m –

Xmax2.8 mm +8%

Sensitivity83.7 dB −4.7

REDCATT41FR

£12.52

Fs134 Hz +9%

Qts0.75 –

Vas1.3 L −33%

BL4.8 T·m −3%

Xmax1.1 mm −58%

Sensitivity87.9 dB −0.5

Dayton AudioCE81PF-8

£12.52

Fs97 Hz −21%

Qts0.81 +8%

Vas1.0 L −49%

BL3.7 T·m −25%

Xmax2.7 mm +4%

Sensitivity82.1 dB −6.3

VisatonFR 10

£13.48

Fs90 Hz −27%

Qts0.67 −11%

Vas2.3 L +19%

BL4.6 T·m −7%

Xmax1.5 mm −42%

Sensitivity84.5 dB −3.9

PeerlessGBS-85N25PR07-04

£14.59

Fs130 Hz +6%

Qts0.70 −7%

Vas0.47 L −76%

BL4.5 T·m −9%

Xmax3.0 mm +13%

Sensitivity83.1 dB −5.3

FaitalPRO4FE35

£16.58

Fs100 Hz −19%

Qts0.83 +11%

Vas2.4 L +24%

BL3.9 T·m −21%

Xmax2.7 mm +5%

Sensitivity85.7 dB −2.7

Sica3.5 H 1 CS

£18.42

Fs85 Hz −31%

Qts0.53 −29%

Vas1.8 L −7%

BL4.8 T·m –

Xmax2.5 mm −4%

Sensitivity84.9 dB −3.5

EminenceALPHA 3-32

£20.53

Fs117 Hz −5%

Qts0.74 –

Vas1.0 L −49%

BL6.5 T·m +31%

Xmax2.6 mm –

Sensitivity84.7 dB −3.7

PeerlessGBS-115N25AL01-04

£21.32

Fs90 Hz −27%

Qts0.63 −16%

Vas1.8 L −8%

BL4.5 T·m −8%

Xmax4.8 mm +87%

Sensitivity84.3 dB −4.1

FaitalPRO4FE32

£21.94

Fs100 Hz −19%

Qts0.61 −19%

Vas2.3 L +19%

BL4.8 T·m –

Xmax2.7 mm +5%

Sensitivity87.2 dB −1.2

Dayton AudioPS95-8

£22.10

Fs120 Hz –

Qts0.72 −4%

Vas0.9 L −52%

BL3.8 T·m −22%

Xmax2.5 mm −4%

Sensitivity85.1 dB −3.3

Dayton AudioDMA105-8

£22.10

Fs72 Hz −41%

Qts0.63 −16%

Vas4.2 L +119%

BL4.5 T·m −9%

Xmax2.5 mm −4%

Sensitivity84.8 dB −3.6

CelestionAF3010

£25.11

Fs129 Hz +5%

Qts0.74 –

Vas0.7 L −65%

BL6.0 T·m +21%

Xmax2.8 mm +6%

Sensitivity84.3 dB −4.1

Sica4 L 1 SL

£25.87

Fs108 Hz −12%

Qts0.63 −16%

Vas1.2 L −38%

BL5.1 T·m +3%

Xmax2.4 mm −8%

Sensitivity84.9 dB −3.5

CIAREHM100

£27.63

Fs160 Hz +30%

Qts0.70 −7%

Vas1.1 L −43%

BL5.1 T·m +3%

Xmax2.2 mm −15%

Sensitivity88.7 dB –

CelestionAF4010

£30.13

Fs105 Hz −15%

Qts0.81 +8%

Vas2.1 L +10%

BL6.0 T·m +21%

Xmax2.8 mm +6%

Sensitivity86.1 dB −2.3

CIAREPA100

£30.98

Fs100 Hz −19%

Qts0.59 −21%

Vas2.5 L +29%

BL4.4 T·m −11%

Xmax2.5 mm −4%

Sensitivity87.6 dB −0.8

CelestionAN3510

£41.86

Fs113 Hz −8%

Qts0.65 −14%

Vas1.9 L −4%

BL4.6 T·m −8%

Xmax2.3 mm −13%

Sensitivity87.7 dB −0.7

WavecorWF090WA02

£57.10

Fs109 Hz −11%

Qts0.76 –

Vas1.1 L −41%

BL3.5 T·m −29%

Xmax2.8 mm +6%

Sensitivity84.3 dB −4.1

VisatonB 80

£72.39

Fs110 Hz −11%

Qts0.63 −16%

Vas1.8 L −7%

BL4.2 T·m −16%

Xmax2.2 mm −15%

Sensitivity87.4 dB −1

Scanspeak10F/8424G00

£83.73

Fs90 Hz −27%

Qts0.37 −51%

Vas2.1 L +8%

BL4.8 T·m –

Xmax2.6 mm –

Sensitivity87.8 dB −0.6

B&C4CXN36

£106.44

Fs113 Hz −8%

Qts0.83 +11%

Vas1.5 L −23%

BL5.1 T·m +4%

Xmax5 mm +92%

Sensitivity85.8 dB −2.6

ScanspeakD8404/552000

£2,428.16

Fs280 Hz +128%

Qts0.69 −8%

Vas0.27 L −86%

BL6.1 T·m +23%

Xmax2.4 mm −8%

Sensitivity90.6 dB +2.2

EminenceALPHA 4-4

No current price

Fs120 Hz –

Qts0.63 −16%

Vas1.8 L −9%

BL4.1 T·m −17%

Xmax2.6 mm –

Sensitivity88.4 dB –

Dayton AudioDMA90-8

No current price

Fs94 Hz −23%

Qts0.57 −24%

Vas1.7 L −12%

BL4.7 T·m −5%

Xmax2.5 mm −4%

Sensitivity84.9 dB −3.5

PeerlessTC10FG00-04

No current price

Fs160 Hz +30%

Qts0.65 −13%

Vas1.7 L −12%

BL3.4 T·m −32%

Xmax2.7 mm +4%

Sensitivity90.9 dB +2.5

WavecorFR084WA02

No current price

Fs109 Hz −11%

Qts0.79 +5%

Vas1.1 L −41%

BL3.6 T·m −26%

Xmax2.5 mm −4%

Sensitivity84 dB −4.4

PeerlessHDS-P830870

No current price

Fs100 Hz −19%

Qts0.60 −20%

Vas1.7 L −11%

BL4.9 T·m –

Xmax5 mm +92%

Sensitivity85 dB −3.4

REDCATT35FR-2

No current price

Fs128 Hz +4%

Qts0.63 −16%

Vas1.1 L −41%

BL4.8 T·m –

Xmax2.4 mm −10%

Sensitivity87.5 dB −0.9

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
Lean Audio Checked 26 Oct 2026 · 8 Ω · Source: inc VAT · 20%	£25.12		Out of stock	Visit shop at Lean Audio
Blue Aran Checked 26 Oct 2026 · 8 Ω · Source: inc VAT · 20% 4-6 weeks	£42.77		Usually available in 4-6 weeks	Visit shop at Blue Aran

bits00 AUDIO

4-inch LF driver · ALPHA series · 55 W

Eminence ALPHA 4-8 8Ω

8 Ω · 105–12000 Hz

No price for delivery to the UK

All 2 offers

Open in 00 Simulator

Fs: 123Hz
Xmax: 2.6mm
SPL: 88dB
Pe: 55W
BL: 4.9T·m
Vd: 15cm³
Qts: 0.75
Vas: 2L

See all 26 specs

Specifications

Published by Eminence

Manufacturer page

Datasheet PDF

The published T/S values agree with each other

Thiele/Small

Fs: 123Hz
Qts: 0.75
Qes: 0.84
Qms: 6.8
Vas: 1.9L
Re: 6.7Ω
Le: 0.28mH

Motor and cone

BL: 4.9T·m
Sd: 58cm²
Mms: 4g
Xmax: 2.6mm
Vd †: 15cm³

Power and response

Sensitivity †: 88.4dB
Manufacturer sensitivity: 88dB
Power: 55W
Impedance: 8Ω
Range: 105–12000Hz
EBP †: 146 · Leans vented

Size and mounting

Diameter: 116.1mm
Cutout: 95.8mm
Bolt circle: 108.0mm
Depth: 58.7mm
Weight: 0.7kg

Other published values

Cms: 0.42mm/N
Xmech: 4.5
Power Program: 110

† Calculated by bits from the published values

What this validation status means

Everything else Eminence lists

LF · Primary · 4″

BL: 4.9T·m
Fs: 123Hz
Le: 0.28mH
Re: 6.7Ω
Sd: 58cm²
Cms: 0.42mm/N
Mms: 4g
Qes: 0.84
Qms: 6.8
Qts: 0.75
SPL: 88.4dB
Vas: 1.9L
Xmax: 2.6mm
Xmech: 4.5
Power: 55W
Impedance: 8Ω
Sensitivity: 88dB
Low limit: 105Hz
Power Program: 110
Calculated sensitivity †: 88.4dB
High limit: 12000Hz
Manufacturer sensitivity: 88dB
Weight: 0.7kg
Diameter: 116.1mm
Depth: 58.7mm
Cutout: 95.8mm
Bolt circle: 108.0mm

Compare

Same-size drivers, compared with the ALPHA 4-8. Clear differences are green when better and red when worse.

This driverALPHA 4-8

Best price

–

123 Hz

Qts

0.75

Vas

1.9 L

4.9 T·m

Xmax

2.6 mm

Sensitivity

88.4 dB

Power

55 W

Dayton AudioPCS115-4

£9.71

Fs88 Hz −28%

Qts0.79 +5%

Vas1.8 L −9%

BL3.6 T·m −27%

Xmax2.8 mm +6%

Sensitivity82.6 dB −5.8

REDCATT4FR-1

£11.96

Fs79 Hz −36%

Qts0.52 −31%

Vas1.8 L −7%

BL4.8 T·m –

Xmax2.8 mm +8%

Sensitivity83.7 dB −4.7

REDCATT41FR

£12.52

Fs134 Hz +9%

Qts0.75 –

Vas1.3 L −33%

BL4.8 T·m −3%

Xmax1.1 mm −58%

Sensitivity87.9 dB −0.5

Dayton AudioCE81PF-8

£12.52

Fs97 Hz −21%

Qts0.81 +8%

Vas1.0 L −49%

BL3.7 T·m −25%

Xmax2.7 mm +4%

Sensitivity82.1 dB −6.3

VisatonFR 10

£13.48

Fs90 Hz −27%

Qts0.67 −11%

Vas2.3 L +19%

BL4.6 T·m −7%

Xmax1.5 mm −42%

Sensitivity84.5 dB −3.9

PeerlessGBS-85N25PR07-04

£14.59

Fs130 Hz +6%

Qts0.70 −7%

Vas0.47 L −76%

BL4.5 T·m −9%

Xmax3.0 mm +13%

Sensitivity83.1 dB −5.3

FaitalPRO4FE35

£16.58

Fs100 Hz −19%

Qts0.83 +11%

Vas2.4 L +24%

BL3.9 T·m −21%

Xmax2.7 mm +5%

Sensitivity85.7 dB −2.7

Sica3.5 H 1 CS

£18.42

Fs85 Hz −31%

Qts0.53 −29%

Vas1.8 L −7%

BL4.8 T·m –

Xmax2.5 mm −4%

Sensitivity84.9 dB −3.5

EminenceALPHA 3-32

£20.53

Fs117 Hz −5%

Qts0.74 –

Vas1.0 L −49%

BL6.5 T·m +31%

Xmax2.6 mm –

Sensitivity84.7 dB −3.7

PeerlessGBS-115N25AL01-04

£21.32

Fs90 Hz −27%

Qts0.63 −16%

Vas1.8 L −8%

BL4.5 T·m −8%

Xmax4.8 mm +87%

Sensitivity84.3 dB −4.1

FaitalPRO4FE32

£21.94

Fs100 Hz −19%

Qts0.61 −19%

Vas2.3 L +19%

BL4.8 T·m –

Xmax2.7 mm +5%

Sensitivity87.2 dB −1.2

Dayton AudioPS95-8

£22.10

Fs120 Hz –

Qts0.72 −4%

Vas0.9 L −52%

BL3.8 T·m −22%

Xmax2.5 mm −4%

Sensitivity85.1 dB −3.3

Dayton AudioDMA105-8

£22.10

Fs72 Hz −41%

Qts0.63 −16%

Vas4.2 L +119%

BL4.5 T·m −9%

Xmax2.5 mm −4%

Sensitivity84.8 dB −3.6

CelestionAF3010

£25.11

Fs129 Hz +5%

Qts0.74 –

Vas0.7 L −65%

BL6.0 T·m +21%

Xmax2.8 mm +6%

Sensitivity84.3 dB −4.1

Sica4 L 1 SL

£25.87

Fs108 Hz −12%

Qts0.63 −16%

Vas1.2 L −38%

BL5.1 T·m +3%

Xmax2.4 mm −8%

Sensitivity84.9 dB −3.5

CIAREHM100

£27.63

Fs160 Hz +30%

Qts0.70 −7%

Vas1.1 L −43%

BL5.1 T·m +3%

Xmax2.2 mm −15%

Sensitivity88.7 dB –

CelestionAF4010

£30.13

Fs105 Hz −15%

Qts0.81 +8%

Vas2.1 L +10%

BL6.0 T·m +21%

Xmax2.8 mm +6%

Sensitivity86.1 dB −2.3

CIAREPA100

£30.98

Fs100 Hz −19%

Qts0.59 −21%

Vas2.5 L +29%

BL4.4 T·m −11%

Xmax2.5 mm −4%

Sensitivity87.6 dB −0.8

CelestionAN3510

£41.86

Fs113 Hz −8%

Qts0.65 −14%

Vas1.9 L −4%

BL4.6 T·m −8%

Xmax2.3 mm −13%

Sensitivity87.7 dB −0.7

WavecorWF090WA02

£57.10

Fs109 Hz −11%

Qts0.76 –

Vas1.1 L −41%

BL3.5 T·m −29%

Xmax2.8 mm +6%

Sensitivity84.3 dB −4.1

VisatonB 80

£72.39

Fs110 Hz −11%

Qts0.63 −16%

Vas1.8 L −7%

BL4.2 T·m −16%

Xmax2.2 mm −15%

Sensitivity87.4 dB −1

Scanspeak10F/8424G00

£83.73

Fs90 Hz −27%

Qts0.37 −51%

Vas2.1 L +8%

BL4.8 T·m –

Xmax2.6 mm –

Sensitivity87.8 dB −0.6

B&C4CXN36

£106.44

Fs113 Hz −8%

Qts0.83 +11%

Vas1.5 L −23%

BL5.1 T·m +4%

Xmax5 mm +92%

Sensitivity85.8 dB −2.6

ScanspeakD8404/552000

£2,428.16

Fs280 Hz +128%

Qts0.69 −8%

Vas0.27 L −86%

BL6.1 T·m +23%

Xmax2.4 mm −8%

Sensitivity90.6 dB +2.2

EminenceALPHA 4-4

No current price

Fs120 Hz –

Qts0.63 −16%

Vas1.8 L −9%

BL4.1 T·m −17%

Xmax2.6 mm –

Sensitivity88.4 dB –

Dayton AudioDMA90-8

No current price

Fs94 Hz −23%

Qts0.57 −24%

Vas1.7 L −12%

BL4.7 T·m −5%

Xmax2.5 mm −4%

Sensitivity84.9 dB −3.5

PeerlessTC10FG00-04

No current price

Fs160 Hz +30%

Qts0.65 −13%

Vas1.7 L −12%

BL3.4 T·m −32%

Xmax2.7 mm +4%

Sensitivity90.9 dB +2.5

WavecorFR084WA02

No current price

Fs109 Hz −11%

Qts0.79 +5%

Vas1.1 L −41%

BL3.6 T·m −26%

Xmax2.5 mm −4%

Sensitivity84 dB −4.4

PeerlessHDS-P830870

No current price

Fs100 Hz −19%

Qts0.60 −20%

Vas1.7 L −11%

BL4.9 T·m –

Xmax5 mm +92%

Sensitivity85 dB −3.4

REDCATT35FR-2

No current price

Fs128 Hz +4%

Qts0.63 −16%

Vas1.1 L −41%

BL4.8 T·m –

Xmax2.4 mm −10%

Sensitivity87.5 dB −0.9

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
Lean Audio Checked 26 Oct 2026 · 8 Ω · Source: inc VAT · 20%	£25.12		Out of stock	Visit shop at Lean Audio
Blue Aran Checked 26 Oct 2026 · 8 Ω · Source: inc VAT · 20% 4-6 weeks	£42.77		Usually available in 4-6 weeks	Visit shop at Blue Aran