Eminence ALPHA-8A
woofer · EBP 107 → suits a ported box · nominal (full) — Eminence datasheet (https://cdn.shopify.com/s/files/1/0270/8665/1462/files/Alpha_8A.pdf)
Thiele/Small parameters
| Fs (resonance) | 73 Hz |
| Qts | 0.59 |
| Qes / Qms | 0.68 / 4.6 |
| Vas | 17.8 L |
| Re / nominal Z | 5.3 Ω / 8 Ω |
| Xmax | 3.2 mm |
| Sensitivity | 91.9 dB (1 W/1 m, calc); 94 dB (2.83 V/1 m, mfr) |
Published (nominal) values, params full — verify by measurement (DATS/REW) before building.
Datasheet (PDF) ↗ — manufacturer-hosted
Recommended enclosures
| Sealed (Qtc 0.707) — Vb | 40.9 L |
| Sealed — Fc / F3 | 87.5 / 87.5 Hz |
| Ported (suggested) — Vb | 62.5 L |
| Ported — Fb / F3 | 49.5 / 42.9 Hz |
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About this driver
The Eminence ALPHA-8A is a 8″ woofer with a free-air resonance of 73 Hz and a total Q (Qts) of 0.59. Its efficiency-bandwidth product (EBP) of 107 points toward a ported alignment. In a 40.9 L sealed box it reaches an F3 of 87.5 Hz (Qtc 0.707); a suggested 62.5 L box tuned to 49.5 Hz extends to about 42.9 Hz. See the sealed vs ported guide for how to choose.
Recommended partners
modeled estimateThe tweeters below pair well with the Eminence ALPHA-8A in a two-way design — each grade is a modeled estimate of the crossover match, with a suggested crossover point. Open any pair in the guided builder to design the crossover and total the parts.
- Seas M64F001Good match· 86/100
Suggested crossover 1.01 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Tang Band W8-2314Good match· 85/100
Suggested crossover 1.01 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Eminence ALPHA-4-4Good match· 84/100
Suggested crossover 1.01 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Eminence ALPHA-4-8Good match· 84/100
Suggested crossover 1.01 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Visaton BG13P-8Good match· 84/100
Suggested crossover 1.01 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Visaton FR10HM-8Good match· 84/100
Suggested crossover 1.01 kHz (4th-order, Linkwitz-Riley)
Build this pair →
Modeled estimate from T/S + geometry — no measurements. The verdict is robust; it improves with measured FRD/ZMA data.