Technysound TS45/500D

18" · 8 Ω · 250 W · 93 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	26.7 Hz
Qts	0.683
Qes	0.82
Qms	4.09
Vas	492 L
Sd	1225 cm²
Xmax	4 mm
Re	7.16 Ω
Bl	14.9 T·m
Mms	151.8 g
Pe	250 W
Sensitivity	93 dB

Alignment hint

EBP	33 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 6848.9 L

EBP < 50: favours a sealed (closed) alignment.

Rules of thumb from T/S parameters only. Verify against a real simulation before cutting wood.

Substitute candidates

Driver	Fs (Hz)	Qts	Vas (L)	Xmax (mm)	Sens (dB)	Fit	Notes	Compare
Technysound TS45/500D vp Gils	28.2 +1.5	0.757 +0.07	341.8 -150.2	4 =	91.5 -1.5	usable		+
GRS 18PT-8	23 -3.7	0.547 -0.14	467 -25	7.8 +3.8	92.5 -0.5	usable		+
FI Audio IB318-SINGLE2	22.3 -4.4	0.652 -0.03	381 -111	12.3 +8.3	93.4 +0.4	usable	4 Ω vs 8 Ω: amp load changes	+
Faital PRO 18FH500	30 +3.3	0.53 -0.15	450.1 -41.9	9.45 +5.45	97 +4	usable	16 Ω vs 8 Ω: amp load changes	+
Monacor SPA-45PA	29 +2.3	0.457 -0.23	440 -52	4 =	96.5 +3.5	usable		+
Selenium WPU 1805-X	35 +8.3	0.7 +0.02	293 -199	6.3 +2.3	94.2 +1.2	usable		+
Mach 5 Audio MAC MAH CWA46	27 +0.3	0.448 -0.24	470.3 -21.7	10 +6	96.2 +3.2	usable		+
Monacor SP-450PA	25 -1.7	0.488 -0.2	670 +178	4.3 +0.3	95.6 +2.6	usable	125 W vs 250 W: lower power handling	+
Pyle Audio PPA18 vp	24.2 -2.5	0.39 -0.29	503.2 +11.2	6 +2	93.1 +0.1	usable	16 Ω vs 8 Ω: amp load changes	+
Eminence KAPPA 18 A	28 +1.3	0.408 -0.28	475.5 -16.5	4.8 +0.8	95.9 +2.9	usable		+

Compare the closest 3 against the TS45/500D →

Ranked on parameter similarity only (Qts, Fs, Vas, Xmax, sensitivity). Same nominal size required. A hint, not a simulation, model the swap before cutting or buying.

Used in enclosures (0)

No enclosure in the catalog uses this driver yet.