Ground Zero subwoofers

Thiele/Small parameters of Ground Zero subwoofers (6.5″, 8″, 10″, 12″, 15″, 18″, 21″) and a recommended sealed and ported box for every model, in a free sub box calculator.

Search Size Voice coils Ω per coil Qts

130 models

Model	Size	Voice coils	Fs, Hz	Qts	Vas, ft³	Xmax, in	RMS, W
GZHW 16SPL (2x2 Ohm)	6.5″	dual 2 Ω	51	0.46	0.10	0.59	500
GZIW 165 (4 Ohm)	6.5″	4 Ω	41	0.41	0.32	—	100
GZIW 165X (4 Ohm)	6.5″	4 Ω	43	0.36	0.39	—	100
GZIW 165X-II (4 Ohm)	6.5″	4 Ω	41.5	0.45	0.30	0.31	150
GZRW 6XSPL (2x2 Ohm)	6.5″	dual 2 Ω	49.5	0.58	0.08	0.43	350
GZHW 8SPL-D2 FLAT (2x2 Ohm)	8″	dual 2 Ω	31.5	0.41	0.50	0.47	500
GZHW 8XSPL-D1 (2x1 Ohm)	8″	dual 1 Ω	42.5	0.47	0.13	0.79	—
GZHW 20-D1 (2x1 Ohm)	8″	dual 1 Ω	38.3	0.38	0.17	1.57	700
GZHW 20SPL (2x2 Ohm)	8″	dual 1 Ω	38.3	0.38	0.17	0.79	700
GZHW 20X (2x2 Ohm)	8″	dual 2 Ω	36	0.36	0.29	0.45	400
GZHW 20XSPL-D1 (2x1 Ohm)	8″	dual 1 Ω	38.3	0.38	0.17	1.57	700
GZHW 20XSPL-D2 (2x2 Ohm)	8″	dual 2 Ω	38.3	0.38	0.17	1.57	700
GZIW 200 (4 Ohm)	8″	4 Ω	32	0.44	0.83	0.79	150
GZIW 200X (4 Ohm)	8″	4 Ω	38.4	0.48	0.95	0.24	150
GZIW 200X-II (4 Ohm)	8″	4 Ω	39.9	0.52	0.60	0.35	150
GZRW 8FL (2 Ohm)	8″	2 Ω	45.3	0.94	0.62	0.28	150
GZRW 8XSPL (2x2 Ohm)	8″	dual 2 Ω	45.8	0.36	0.26	0.87	500
GZRW 8XSPL-D1 (2x1 Ohm)	8″	dual 1 Ω	45.8	0.36	0.26	0.87	500
GZUW 8CF (2x2 Ohm)	8″	dual 2 Ω	57	0.70	0.17	0.79	300
GZUW 8SQ-D2 (2x2 Ohm)	8″	dual 2 Ω	56.9	0.70	0.17	0.79	300
GZHW 10-D2 FLAT (2x2 Ohm)	10″	dual 2 Ω	35.5	0.43	0.70	0.57	600
GZHW 10SPL-D2 FLAT (2x2 Ohm)	10″	dual 2 Ω	35.5	0.43	0.70	0.57	600
GZHW 10XSPL-D1 (2x1 Ohm)	10″	dual 1 Ω	40.5	0.41	0.36	0.79	—
GZHW 25-D1 (2x1 Ohm)	10″	dual 1 Ω	41.8	0.49	0.30	1.77	1,200
GZHW 25-D2 (2x2 Ohm)	10″	dual 2 Ω	41.8	0.49	0.30	1.77	1,200
GZHW 25SPL (2x1 Ohm)	10″	dual 1 Ω	41.8	0.49	0.30	0.55	1,200
GZHW 25X (2x2 Ohm)	10″	dual 2 Ω	27.1	0.37	0.95	0.47	600
GZHW 25XSPL-D1 (2x1 Ohm)	10″	dual 1 Ω	41.8	0.49	0.30	0.55	1,200
GZHW 25XSPL-D2 (2x2 Ohm)	10″	dual 2 Ω	41.8	0.49	0.30	1.77	1,200
GZIW 10SPL (2x2 Ohm)	10″	dual 2 Ω	40.8	0.62	0.50	0.43	500
GZIW 10XSPL-D2 (2x2 Ohm)	10″	dual 2 Ω	40.8	0.62	0.81	0.98	500
GZIW 250 (4 Ohm)	10″	4 Ω	27	0.44	1.74	0.98	250
GZIW 250X (4 Ohm)	10″	4 Ω	30.1	0.44	1.55	0.55	250
GZNW 25C (2x2 Ohm)	10″	dual 2 Ω	42	0.50	0.24	1.77	1,500
GZPW 10SPL (2x1 Ohm)	10″	dual 1.6 Ω	51.7	0.40	0.24	0.59	—
GZPW 10SQ (2x2 Ohm)	10″	dual 2 Ω	34	0.58	0.83	0.59	400
GZPW 10SQX (2x2 Ohm)	10″	dual 2 Ω	36	0.59	0.78	1.42	400
GZPW Reference 250 (2x2 Ohm)	10″	dual 2 Ω	31	0.53	1.11	1.57	500
GZRW 10D2 (2x2 Ohm)	10″	dual 2 Ω	34	0.61	0.82	0.69	600
GZRW 10D4 (2x4 Ohm)	10″	dual 4 Ω	34.6	0.63	0.79	0.69	600
GZRW 10XSPL (2x2 Ohm)	10″	dual 2 Ω	44.3	0.75	0.32	1.18	800
GZRW 25-D2 (2x2 Ohm)	10″	dual 2 Ω	26.3	0.54	1.00	1.97	600
GZRW 25XSPL-D1 (2x1 Ohm)	10″	dual 1 Ω	40.3	0.47	0.47	0.43	—
GZRW 25XSPL-D2 (2x2 Ohm)	10″	dual 2 Ω	44.8	0.64	0.81	0.43	—
GZRW 250-D2 FLAT (2x2 Ohm)	10″	dual 2 Ω	28	0.54	1.26	0.87	400
GZTW 10F (2x2 Ohm) !	10″	dual 2 Ω	33	0.57	1.20	1.18	300
GZTW 25TX (2x2 Ohm)	10″	dual 2 Ω	38.3	0.53	1.00	0.55	300
GZUW 10CF (2x2 Ohm)	10″	dual 2 Ω	40.2	0.54	0.77	0.79	450
GZUW 10SQX (2x2 Ohm)	10″	dual 2 Ω	46.7	0.62	0.50	0.39	450
GZHW 12SPL (2x2 Ohm)	12″	dual 2 Ω	42.8	0.53	0.77	0.79	—
GZHW 12SPL-D2 FLAT (2x2 Ohm)	12″	dual 2 Ω	21	0.30	4.15	0.63	700
GZHW 12XSPL-D1 (2x1 Ohm)	12″	dual 1 Ω	39.7	0.48	0.62	0.79	—
GZHW 30-D1 (2x1 Ohm)	12″	dual 1 Ω	39.1	0.56	0.62	1.77	1,500
GZHW 30-D2 (2x2 Ohm)	12″	dual 2 Ω	39.1	0.56	0.62	1.77	1,500
GZHW 30SPL (2x1 Ohm)	12″	dual 1 Ω	35.4	0.44	0.56	0.89	1,500
GZHW 30X (2x2 Ohm)	12″	dual 2 Ω	23.5	0.33	2.19	0.48	800
GZHW 30XSPL-D1 (2x1 Ohm)	12″	dual 1 Ω	39.1	0.56	0.62	1.77	1,500
GZHW 30XSPL-D2 (2x2 Ohm)	12″	dual 2 Ω	39.1	0.56	0.62	1.77	1,500
GZIW 12SPL (2x2 Ohm)	12″	dual 2 Ω	36.9	0.67	1.26	0.43	700
GZIW 12XSPL-D2 (2x2 Ohm)	12″	dual 2 Ω	32.5	0.73	1.43	1.34	600
GZIW 300 (4 Ohm)	12″	4 Ω	30	0.58	2.45	1.10	350
GZIW 300X (4 Ohm)	12″	4 Ω	34.9	0.69	1.89	0.55	350
GZNW 12SPL (2x1 Ohm)	12″	dual 1 Ω	30.2	0.38	1.36	0.98	—
GZNW 12SPL-XFLEX (2x1 Ohm)	12″	dual 1 Ω	33.9	0.36	0.96	2.36	2,500
GZNW 12X (2x2 Ohm)	12″	dual 2 Ω	35.3	0.43	0.78	0.98	2,000
GZNW 12X-D2 (2x2 Ohm) !	12″	dual 2 Ω	21.8	0.33	1.24	2.44	2,000
GZNW 12XMAX (2x1 Ohm) !	12″	dual 1 Ω	35.6	0.61	0.48	2.36	3,000
GZNW 12XSPL (2x1 Ohm)	12″	dual 1 Ω	38.1	0.41	0.91	0.98	—
GZNW 30SPL-D1 (2x1 Ohm) !	12″	dual 1 Ω	38.6	0.38	0.83	2.76	3,000
GZNW 30SPL-D2 (2x2 Ohm) !	12″	dual 2 Ω	41.3	0.54	0.88	2.76	3,000
GZNW 30XMAX-II (2x1 Ohm)	12″	dual 1 Ω	35.6	0.61	0.48	2.36	3,000
GZPW 12SPL (2x1 Ohm)	12″	dual 1 Ω	47.7	0.45	0.53	0.89	—
GZRW 12D2 (2x2 Ohm)	12″	dual 2 Ω	28.4	0.43	1.78	0.89	800
GZRW 12D4 (2x4 Ohm)	12″	dual 4 Ω	30.2	0.48	1.68	0.89	800
GZRW 12FL (2x2 Ohm)	12″	dual 2 Ω	25.3	0.55	2.63	0.30	450
GZRW 12XFL (2x2 Ohm)	12″	dual 2 Ω	28.4	0.47	2.24	0.35	500
GZRW 12XSPL (2x2 Ohm)	12″	dual 2 Ω	31.8	0.68	0.96	1.77	1,000
GZRW 30-D2 (2x2 Ohm)	12″	dual 2 Ω	25.7	0.50	1.10	1.97	800
GZRW 30C (4 Ohm)	12″	dual 2 Ω	27	0.35	3.14	0.39	500
GZRW 30SPL (2x2 Ohm)	12″	dual 2 Ω	33	0.36	1.84	0.39	1,000
GZRW 30SPL-EXTREME (2x2 Ohm)	12″	dual 2 Ω	33.7	0.43	1.64	0.43	—
GZRW 30XSPL-D1 (2x1 Ohm)	12″	dual 1 Ω	39.2	0.55	0.71	0.79	—
GZRW 30XSPL-D2 (2x2 Ohm)	12″	dual 2 Ω	36.1	0.59	0.81	0.49	1,000
GZRW 300-D2 FLAT (2x2 Ohm) !	12″	dual 2 Ω	23.5	0.44	2.13	1.18	450
GZRW 300X (4 Ohm)	12″	4 Ω	28.1	0.31	2.65	0.39	500
GZTW 12F (2x2 Ohm)	12″	dual 2 Ω	35.1	0.53	1.88	0.63	350
GZTW 30TX (2x2 Ohm)	12″	dual 2 Ω	33.7	0.53	1.96	0.55	400
GZUW 12SQX (2x2 Ohm)	12″	dual 2 Ω	38.6	0.62	1.45	0.39	600
GZUW 300SQ (2x3 Ohm)	12″	dual 3 Ω	25.3	0.42	3.06	0.26	700
GZHW 15SPL (2x2 Ohm)	15″	dual 2 Ω	40.9	0.61	1.76	0.79	—
GZHW 15XSPL-D1 (2x1 Ohm)	15″	dual 1 Ω	36.8	0.48	1.40	0.55	2,000
GZHW 38-D1 (2x1 Ohm)	15″	dual 1 Ω	36.3	0.52	1.16	1.77	1,500
GZHW 38-D2 (2x2 Ohm)	15″	dual 2 Ω	36.3	0.52	1.16	1.77	1,500
GZHW 38SPL (2x1 Ohm)	15″	dual 1 Ω	36.3	0.52	1.16	0.55	2,000
GZHW 38X (2x2 Ohm)	15″	dual 2 Ω	22.6	0.43	5.19	0.43	1,000
GZHW 38XSPL-D1 (2x1 Ohm)	15″	dual 1 Ω	36.3	0.52	1.16	0.55	1,500
GZHW 38XSPL-D2 (2x2 Ohm)	15″	dual 2 Ω	36.3	0.52	1.16	1.77	1,500
GZIW 15SPL (2x2 Ohm)	15″	dual 2 Ω	39.9	0.55	2.17	0.39	900
GZNW 15NEO-EXTREME (2x1 Ohm) !	15″	dual 1 Ω	36.6	0.16	1.24	2.56	3,000
GZNW 15SPL (2x1 Ohm)	15″	dual 1 Ω	32.3	0.42	2.30	0.98	—
GZNW 15SPL-XFLEX (2x1 Ohm)	15″	dual 1 Ω	30.2	0.49	2.09	1.38	3,000
GZNW 15X (2x2 Ohm)	15″	dual 2 Ω	37.8	0.50	1.73	0.98	2,500
GZNW 15X-D2 (2x2 Ohm) !	15″	dual 2 Ω	35.2	0.54	0.99	2.44	2,500
GZNW 15XMAX (2x1 Ohm)	15″	dual 1 Ω	29.5	0.33	1.26	2.36	4,000
GZNW 15XSPL (2x1 Ohm)	15″	dual 1 Ω	39	0.57	1.70	0.98	—
GZNW 38C (2x1 Ohm) !	15″	dual 1 Ω	33	0.38	0.81	3.15	6,000
GZNW 38NEO-XSPL (2x1 Ohm) !	15″	dual 1 Ω	31	0.16	0.87	3.15	6,000
GZNW 38SPL-D1 (2x1 Ohm) !	15″	dual 1 Ω	36	0.52	1.91	3.15	3,500
GZNW 38SPL-D2 (2x2 Ohm) !	15″	dual 2 Ω	36.5	0.61	2.24	3.15	3,500
GZNW 38XMAX-II (2x1 Ohm) !	15″	dual 1 Ω	31	0.51	0.93	2.44	4,000
GZPW 15 Limited (2x1 Ohm)	15″	dual 1 Ω	35.6	0.39	1.78	—	5,000
GZPW 15C (2x1 Ohm)	15″	dual 1 Ω	31	0.51	1.00	2.36	6,500
GZPW 15NEO-XSPL (2x1 Ohm)	15″	dual 1 Ω	31	0.15	0.92	2.36	6,500
GZPW 15SPL (1x2 Ohm)	15″	dual 1 Ω	39.1	0.25	1.30	0.53	—
GZPW 15SPL-EXTREME (2x1 Ohm)	15″	dual 1 Ω	46	0.31	1.01	0.69	—
GZPW 15XMAX (2x1 Ohm)	15″	dual 1 Ω	33.3	0.44	0.81	0.89	6,000
GZPW 15XMAX-II (2x1 Ohm) !	15″	dual 1 Ω	30	0.42	0.95	3.15	6,000
GZPW 15XQ (4x1 Ohm) !	15″	1 Ω	32	0.27	1.73	0.98	5,000
GZRW 15D2 (2x2 Ohm)	15″	dual 2 Ω	23.6	0.44	5.76	0.49	1,000
GZRW 15D4 (2x4 Ohm)	15″	dual 4 Ω	24.7	0.46	4.80	0.49	1,000
GZRW 15XSPL (2x2 Ohm)	15″	dual 2 Ω	34.1	0.59	2.24	1.77	1,200
GZRW 38-D2 (2x2 Ohm)	15″	dual 2 Ω	22.9	0.50	3.90	1.97	1,000
GZRW 38SPL (2x2 Ohm)	15″	dual 2 Ω	33	0.39	3.28	0.43	—
GZRW 38XSPL-D2 (2x2 Ohm)	15″	dual 2 Ω	33.5	0.62	2.31	0.79	—
GZUW 15XII (2x2 Ohm)	15″	dual 2 Ω	40.9	0.61	1.76	0.79	2,000
GZHW 18XSPL-D1 (2x1 Ohm)	18″	dual 1 Ω	34.3	0.38	2.66	0.89	—
GZNW 18XSPL (2x1 Ohm)	18″	dual 1 Ω	31.3	0.58	4.93	0.98	—
GZPW 18SPL (2x1 Ohm) !	18″	dual 1 Ω	34	0.19	3.07	0.69	—
GZPW 18SPL-EXTREME (2x1 Ohm)	18″	dual 1 Ω	41	0.34	2.47	0.69	—
GZPW 21SPL (2x1 Ohm)	21″	dual 1 Ω	34.5	0.55	3.95	—	7,000

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