Eminence ALPHA-8MRA
woofer · EBP 247 → suits a ported box · nominal (full) — Eminence datasheet (https://cdn.shopify.com/s/files/1/0270/8665/1462/files/Alpha_8MRA.pdf)
Thiele/Small parameters
| Fs (resonance) | 514 Hz |
| Qts | 1.42 |
| Qes / Qms | 2.08 / 4.48 |
| Vas | 0.8 L |
| Re / nominal Z | 7.32 Ω / 8 Ω |
| Xmax | 1.6 mm |
| Sensitivity | 99.3 dB (1 W/1 m, calc); 100.9 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 | Infinity L |
| Sealed — Fc / F3 | 514.0 / 363.2 Hz |
| Ported (suggested) — Vb | 54.0 L |
| Ported — Fb / F3 | 141.9 / 339.4 Hz |
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About this driver
The Eminence ALPHA-8MRA is a 8″ woofer with a free-air resonance of 514 Hz and a total Q (Qts) of 1.42. Its efficiency-bandwidth product (EBP) of 247 points toward a ported alignment. In a Infinity L sealed box it reaches an F3 of 363.2 Hz (Qtc 0.707); a suggested 54.0 L box tuned to 141.9 Hz extends to about 339.4 Hz. See the sealed vs ported guide for how to choose.
Recommended partners
modeled estimateThe tweeters below pair well with the Eminence ALPHA-8MRA 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.
- Eminence ALPHA-4-4Good match· 84/100
Suggested crossover 1.02 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Eminence ALPHA-4-8Good match· 84/100
Suggested crossover 1.02 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Visaton BG13P-8Good match· 84/100
Suggested crossover 1.02 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Visaton FR10HM-8Good match· 84/100
Suggested crossover 1.02 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Visaton FR4X6X-4Good match· 84/100
Suggested crossover 1.02 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Visaton DSM50FFL-8Good match· 83/100
Suggested crossover 1.02 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.