Audio System subwoofers

Thiele/Small parameters of Audio System subwoofers (8″, 10″, 12″, 15″) and a recommended sealed and ported box for every model, in a free sub box calculator.

Search Size Voice coils Ω per coil Qts

21 models

Model	Size	Voice coils	Fs, Hz	Qts	Vas, ft³	Xmax, in	RMS, W
HX 08 SQ	8″	4 Ω	35.3	0.47	0.56	0.37	250
R08 EVO !	8″	dual 4 Ω	39.9	0.38	0.41	0.63	300
R08 FLAT EVO3-D4 !	8″	dual 4 Ω	59	0.47	0.27	0.49	200
X08 EVO	8″	dual 2 Ω	40.4	0.36	0.51	0.75	400
H10 EVO	10″	dual 2 Ω	38	0.37	0.49	0.87	2,000
HX 10 SQ	10″	4 Ω	27.6	0.39	1.11	0.43	350
M10 EVO 2	10″	dual 2 Ω	35.8	0.44	0.89	0.59	300
R 10 FLAT	10″	4 Ω	27.7	0.65	0.90	0.24	225
R10 EVO !	10″	dual 4 Ω	34.5	0.51	0.87	0.85	400
X10 EVO !	10″	dual 2 Ω	29.6	0.35	0.52	1.18	600
H12 EVO !	12″	dual 2 Ω	36	0.45	0.86	0.87	2,200
HX 12 SQ	12″	4 Ω	28.2	0.50	2.40	0.46	450
M12 EVO 2	12″	dual 2 Ω	33	0.44	2.07	0.47	500
R 12	12″	4 Ω	27.7	0.35	2.98	0.33	400
R 12 FLAT	12″	4 Ω	25.7	0.58	2.86	0.28	375
R12 FA EVO	12″	4 Ω	37	1.02	0.95	1.02	375
X12 EVO	12″	dual 2 Ω	27.9	0.37	1.48	1.18	1,000
H15 EVO !	15″	dual 2 Ω	34	0.62	1.83	0.87	2,500
M 15	15″	4 Ω	24.4	0.55	8.04	0.39	400
R 15 FA	15″	4 Ω	22.9	0.52	7.42	0.35	450
X 15-1100 !	15″	dual 4 Ω	29	0.56	1.48	0.61	1,100

Click a column header to sort. “!” means the model’s published specs don’t add up; details are on its page.