Sine Design

Peerless by Tymphany TC9FD18-08

fullrange · EBP 94 → suits either box · nominal (full) — Tymphany TC9FD-18-08 transducer specification sheet (manufacturer)

Thiele/Small parameters

Fs (resonance)125 Hz
Qts0.89
Qes / Qms1.33 / 2.7
Vas1.2 L
Re / nominal Z6.3 Ω / 8 Ω
Xmax2.5 mm
Sensitivity84.4 dB (1 W/1 m, calc); 84.6 dB (2.83 V/1 m, mfr)
Power handling30 W

Published (nominal) values, params full — verify by measurement (DATS/REW) before building. datasheet

Recommended enclosures

Sealed (Qtc 0.707) — VbInfinity L
Sealed — Fc / F3125.0 / 104.4 Hz
Ported (suggested) — Vb16.9 L
Ported — Fb / F355.6 / 50.5 Hz
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About this driver

The Peerless by Tymphany TC9FD18-08 is a 3.5″ fullrange with a free-air resonance of 125 Hz and a total Q (Qts) of 0.89. Its efficiency-bandwidth product (EBP) of 94 points toward either alignment. In a Infinity L sealed box it reaches an F3 of 104.4 Hz (Qtc 0.707); a suggested 16.9 L box tuned to 55.6 Hz extends to about 50.5 Hz. See the sealed vs ported guide for how to choose.

NOMINAL/manufacturer (Tymphany spec sheet Rev 3_0). Fs 125 Hz; Zmin 7.8 ohm (nominal 8); Vas 1.241 L; Sd 36.3 cm2; BL 3.01 Tm; Mms 2.43 g; Xmax 2.55 mm; sensitivity 84.6 dB@2.83V (83.5 dB@1W); 30 W IEC; test bandwidth 100Hz-20kHz 12 dB/oct. Iconic budget full-range (Vifa/Tymphany TC); paper cone.

Recommended partners

modeled estimate

The tweeters below pair well with the Peerless by Tymphany TC9FD18-08 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.

Modeled estimate from T/S + geometry — no measurements. The verdict is robust; it improves with measured FRD/ZMA data.

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