Eminence BETA-8CX
woofer · EBP 200 → suits a ported box · nominal (full) — Eminence datasheet (https://cdn.shopify.com/s/files/1/0270/8665/1462/files/Beta_8CX.pdf)
Thiele/Small parameters
| Fs (resonance) | 62 Hz |
| Qts | 0.29 |
| Qes / Qms | 0.31 / 6.57 |
| Vas | 21.5 L |
| Re / nominal Z | 5.37 Ω / 8 Ω |
| Xmax | 3.2 mm |
| Sensitivity | 94.0 dB (1 W/1 m, calc); 92.9 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 | 4.4 L |
| Sealed — Fc / F3 | 151.2 / 151.2 Hz |
| Ported (suggested) — Vb | 7.2 L |
| Ported — Fb / F3 | 86.9 / 98.7 Hz |
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About this driver
The Eminence BETA-8CX is a 8″ woofer with a free-air resonance of 62 Hz and a total Q (Qts) of 0.29. Its efficiency-bandwidth product (EBP) of 200 points toward a ported alignment. In a 4.4 L sealed box it reaches an F3 of 151.2 Hz (Qtc 0.707); a suggested 7.2 L box tuned to 86.9 Hz extends to about 98.7 Hz. See the sealed vs ported guide for how to choose.
Recommended partners
modeled estimateThe tweeters below pair well with the Eminence BETA-8CX 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· 89/100
Suggested crossover 1.01 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Tang Band W8-2314Good match· 88/100
Suggested crossover 1.01 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Wavecor TW030WA05Good match· 87/100
Suggested crossover 1.01 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Wavecor TW030WA06Good match· 86/100
Suggested crossover 1.01 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Seas T29CF002Good 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 →
Modeled estimate from T/S + geometry — no measurements. The verdict is robust; it improves with measured FRD/ZMA data.