Altec 918-8A

15" · 8 Ω · 35 W · 101.4 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	8 Ω
Fs	32.6 Hz
Qts	0.209
Qes	0.23
Qms	2.27
Vas	372.7 L
Sd	825.8 cm²
Xmax	1.3 mm
Re	5.1 Ω
Bl	16.7 T·m
Mms	61.1 g
Pe	35 W
Sensitivity	101.4 dB

Alignment hint

EBP	142 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 35.7 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
Cyrille Audio BM38ND76P	33 +0.4	0.236 +0.03	372 -0.7	1.8 +0.5	100.9 -0.5	close		+
Cyrille Audio BM38ND76P-2	33 +0.4	0.236 +0.03	372 -0.7	1.9 +0.6	100.9 -0.5	close		+
DAS Audio MI-30	34.3 +1.7	0.203 -0.01	360 -12.7	4.3 +3	101.2 -0.2	close		+
Altec 421-8H	31.5 -1.1	0.245 +0.04	362.5 -10.2	1.3 =	99.8 -1.6	close		+
Benett 15.200 X/N	34.3 +1.7	0.211 =	338 -34.7	5 +3.7	101.2 -0.2	close		+
Altec 515-16G	37 +4.4	0.215 +0.01	345.5 -27.2	3 +1.7	99.4 -2	usable	16 Ω vs 8 Ω: amp load changes	+
Great Plains Audio 515-16G GPA	37 +4.4	0.215 +0.01	345.5 -27.2	3 +1.7	99.4 -2	usable	16 Ω vs 8 Ω: amp load changes	+
Focal AUDIOM 15	32.5 -0.1	0.236 +0.03	379.7 +7	6 +4.7	100.4 -1	usable		+
Iconic Speakers 165-16G	37 +4.4	0.22 +0.01	357.9 -14.8	3.1 +1.8	99.4 -2	usable	16 Ω vs 8 Ω: amp load changes	+
Great Plains Audio 515-8GHP GPA	37 +4.4	0.187 -0.02	342.6 -30.1	2.8 +1.5	101.2 -0.2	usable	16 Ω vs 8 Ω: amp load changes	+

Compare the closest 3 against the 918-8A →

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.