Peavey 1203-8 v1993

12" · 8 Ω · 350 W · 98.7 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	59.4 Hz
Qts	0.381
Qes	0.4
Qms	8.1
Vas	69 L
Sd	515 cm²
Xmax	1 mm
Re	6.1 Ω
Bl	14.8 T·m
Mms	38.7 g
Pe	350 W
Sensitivity	98.7 dB

Alignment hint

EBP	149 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 28.2 L

EBP > 100: favours a ported (bass-reflex) 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
Fostex 12w150	60 +0.6	0.411 +0.03	74 +5	1.2 +0.2	98.9 +0.2	close	60 W vs 350 W: lower power handling	+
Peavey 1203-4 v1993	57.8 -1.6	0.371 -0.01	72 +3	1 =	101.8 +3.1	close	4 Ω vs 8 Ω: amp load changes	+
LaVoce FSF122.02	57 -2.4	0.374 -0.01	69.5 +0.5	3 +2	98.4 -0.3	close	150 W vs 350 W: lower power handling	+
Celestion TF 1218TC	56 -3.4	0.408 +0.03	80.2 +11.2	1.5 +0.5	98.4 -0.3	close	100 W vs 350 W: lower power handling	+
Celestion TF 1218TC v2008	56 -3.4	0.408 +0.03	80.2 +11.2	1.5 +0.5	98.4 -0.3	close	100 W vs 350 W: lower power handling	+
Celestion TF1220	55.8 -3.6	0.389 +0.01	72.79 +3.79	2 +1	96.4 -2.3	close	150 W vs 350 W: lower power handling	+
Fertin Acoustics LB 31 SONO	59.5 +0.1	0.407 +0.03	70 +1	4 +3	97.5 -1.2	close	200 W vs 350 W: lower power handling	+
Beyma SM112 vp	57.8 -1.6	0.391 +0.01	64.6 -4.4	4.2 +3.2	97.7 -1	close	250 W vs 350 W: lower power handling	+
Peerless FSL-1225R02-08	59 -0.4	0.407 +0.03	59.4 -9.6	2.5 +1.5	98 -0.7	close		+
RCF L 12/568H	58 -1.4	0.409 +0.03	72 +3	4 +3	98.1 -0.6	close	200 W vs 350 W: lower power handling	+

Compare the closest 3 against the 1203-8 v1993 →

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.