Seas MCA12RC
midrange · EBP 92 → suits either box · nominal (full) — Seas datasheet (https://www.seas.no/images/stories/prestige/pdfdatasheet/h1304_mca12rc_datasheet.pdf)
Thiele/Small parameters
| Fs (resonance) | 68 Hz |
| Qts | 0.56 |
| Qes / Qms | 0.74 / 2.42 |
| Vas | 5.0 L |
| Re / nominal Z | 6.3 Ω / 8 Ω |
| Xmax | — |
| Sensitivity | 85.1 dB (1 W/1 m, calc); 86 dB (2.83 V/1 m, mfr) |
| Power handling | 110 W |
Published (nominal) values, params full — verify by measurement (DATS/REW) before building.
Datasheet (PDF) ↗ — manufacturer-hosted
Recommended enclosures
This is a midrange; Thiele/Small box parameters are not used for enclosure design.
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About this driver
The Seas MCA12RC is a 4″ midrange with a free-air resonance of 68 Hz and a total Q (Qts) of 0.56. Its efficiency-bandwidth product (EBP) of 92 points toward either alignment. See the sealed vs ported guide for how to choose.
Recommended partners
modeled estimateThe tweeters below pair well with the Seas MCA12RC 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 27TBFC/G H1212-06Good match· 92/100
Suggested crossover 1.97 kHz (4th-order, Linkwitz-Riley)
Build this pair → - SB Acoustics SB29RDC-C000-4Good match· 92/100
Suggested crossover 1.97 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Dayton Audio RS28F-4Good match· 92/100
Suggested crossover 1.97 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Dayton Audio EC30-4Good match· 92/100
Suggested crossover 1.97 kHz (4th-order, Linkwitz-Riley)
Build this pair → - SB Acoustics SATORI TW29BGood match· 92/100
Suggested crossover 1.97 kHz (4th-order, Linkwitz-Riley)
Build this pair → - SB Acoustics SATORI TW29B-BGood match· 92/100
Suggested crossover 1.97 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.