Conrad DS-120i

12" · 4 Ω · 120 W · 95.7 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	27.8 Hz
Qts	0.248
Qes	0.27
Qms	3.1
Vas	130.5 L
Sd	491 cm²
Xmax	1.5 mm
Re	3.5 Ω
Bl	13.9 T·m
Mms	85 g
Pe	120 W
Sensitivity	95.7 dB

Alignment hint

EBP	103 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 18.3 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
Conrad DS-120	28 +0.2	0.248 =	130.5 =	4 +2.5	95.8 +0.1	close		+
RCF L12P400K	33.7 +5.9	0.25 =	130 -0.5	6 +4.5	94.7 -1	usable	8 Ω vs 4 Ω: amp load changes	+
RCF L 12P400K	34 +6.2	0.241 -0.01	130 -0.5	6 +4.5	96.3 +0.6	usable	8 Ω vs 4 Ω: amp load changes	+
Beyma POWER 12 COMPETITION	29 +1.2	0.27 +0.02	122 -8.5	9 +7.5	95.1 -0.6	usable	8 Ω vs 4 Ω: amp load changes	+
JBL 1200FE-8	27 -0.8	0.256 +0.01	125 -5.5	10 +8.5	93.3 -2.4	usable	8 Ω vs 4 Ω: amp load changes	+
Raveland BSW 124-II	28 +0.2	0.252 =	91.4 -39.1	5.4 +3.9	94.7 -1	usable		+
JBL LE14-H	26 -1.8	0.265 +0.02	147.2 +16.7	4.7 +3.2	92.7 -3	usable	8 Ω vs 4 Ω: amp load changes	+
SICA 12SR3PL	27.4 -0.4	0.27 +0.02	103.1 -27.4	7 +5.5	94.8 -0.9	usable		+
Audax PR330M0 vp2	33.7 +5.9	0.284 +0.04	122.2 -8.3	4 +2.5	95.1 -0.6	usable	8 Ω vs 4 Ω: amp load changes	+
Beyma 12B100R v2017	29 +1.2	0.296 +0.05	154 +23.5	3 +1.5	93.6 -2.1	usable	8 Ω vs 4 Ω: amp load changes	+

Compare the closest 3 against the DS-120i →

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.