Scan-Speak 18M/4631T00
midrange · EBP 97 → suits either box · nominal (full) — Scan-Speak 18M/4631T00 datasheet (manufacturer)
Thiele/Small parameters
| Fs (resonance) | 65 Hz |
| Qts | 0.6 |
| Qes / Qms | 0.67 / 5.65 |
| Vas | 14.0 L |
| Re / nominal Z | 3.5 Ω / 4 Ω |
| Xmax | 3.0 mm |
| Sensitivity | 89.4 dB (1 W/1 m, calc); 92 dB (2.83 V/1 m, mfr) |
| Power handling | 250 W |
Published (nominal) values, params full — verify by measurement (DATS/REW) before building. datasheet
Recommended enclosures
This is a midrange; Thiele/Small box parameters are not used for enclosure design.
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About this driver
The Scan-Speak 18M/4631T00 is a 7″ midrange with a free-air resonance of 65 Hz and a total Q (Qts) of 0.6. Its efficiency-bandwidth product (EBP) of 97 points toward either alignment. See the sealed vs ported guide for how to choose.
NOMINAL/manufacturer (Scan-Speak datasheet). Fs 65 Hz; Vas 14.0 L; Sd 154 cm2; BL 5.6 Tm; Mms 14.3 g; sensitivity 92 dB (2.83V/1m); operating range 70-6000 Hz; rec. crossover 2nd-order HP Butterworth 100 Hz; Xmax 3 mm. Sliced-paper Revelator midrange.
Recommended partners
modeled estimateThe tweeters below pair well with the Scan-Speak 18M/4631T00 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· 90/100
Suggested crossover 1.18 kHz (4th-order, Linkwitz-Riley)
Build this pair → - SB Acoustics SB29RDC-C000-4Good match· 90/100
Suggested crossover 1.18 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Peerless by Tymphany D27TG35-06Good match· 81/100
Suggested crossover 1.37 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Dayton Audio RS28F-4Good match· 80/100
Suggested crossover 1.18 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Dayton Audio ND25FA-4Poor match· 45/100
Suggested crossover 2.02 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.