Passive Crossovers 8 Ohm Reference Charts

If you need a 16 mHy coil, you can series a 12.8 mHy coil and a 3.2 mHy coil. If you need a 70 µfd capacitor, you can parallel two 35 µfd capacitors. When the exact value of a coil or capacitor is not available, you can substitute values of ± 5% . To get the needed values for desired crossover frequencies not listed, use these formulas & calculators

8 Ohm Charts:
• High Pass, Low Pass, Band Pass
• Narrow Band Pass

Passive Crossovers:
• Low Pass Filters
• High Pass Filters
• Band Pass Filters
• Narrow Band Pass Filters
• Acoustical Output & Power
• First Order Filters
• Second Order Filters
• Third Order Filters
• Zobel
• 2 Ohm Charts
• 4 Ohm Charts
• 8 Ohm Charts
• Formulas & Calculators

Car Audio:
• Glossary of Terms and Definitions
• Ohm's Law
• Passive Crossovers & Calculators
• Metra Application Guides
• Power and Ground Cable Sizes
• Subwoofer Enclosures & Calculators
• Subwoofer Wiring
• the12volt's Application Guide
• the12volt's Install Bay (forums)
• Thiele - Small Parameters
• Tools & Equipment

Low Pass, High Pass, Band Pass for 8 Ohm Load
Crossover Frequency	1st Order 6dB		2nd Order 12db		3rd Order 18dB
Hz	L1	C1	L2	C2	L3	C3	L4	C4	L5	C5
50	25.5	398	36	281	38.2	529	12.7	265	19.1	796
60	21.2	331	30	234	31.8	441	10.6	221	15.9	663
70	18.2	284	25.7	200	27.3	378	9.1	190	13.6	568
75	16.9	265	24	188	25.5	353	8.5	177	12.7	530
80	15.9	249	22.5	176	23.9	331	7.9	166	11.9	497
85	14.9	234	21.2	165	22.5	311	7.5	156	11.2	468
100	12.7	199	18	141	19.1	265	6.4	133	9.6	398
120	10.6	166	15	117	15.9	221	5.3	111	7.9	332
125	10.2	159	14.4	113	15.3	212	5.1	106	7.6	318
150	8.4	133	12	94	12.7	176	4.2	89	6.4	265
200	6.4	99	9	70	9.6	132	3.2	66	4.8	199
250	5.1	80	7.2	56	7.6	106	2.5	53	3.8	159
275	4.6	72	6.5	51	6.9	96	2.3	48	3.5	145
300	4.2	66	6	47	6.4	88	2.1	44	3.2	133
400	3.2	50	4.5	35	4.8	66	1.6	33	2.4	99
500	2.5	40	3.6	28	3.8	53	1.3	27	1.9	80
600	2.1	33	3	23	3.2	44	1.1	22	1.59	66
800	1.6	25	2.3	18	2.4	33	0.79	17	1.2	50
1000	1.3	20	1.8	14	1.9	26	0.64	13	0.95	40
2000	0.64	9.9	0.9	7	0.95	13	0.32	6.6	0.48	20
2500	0.51	7.9	0.72	5.6	0.76	11	0.25	5.3	0.38	16
3000	0.42	6.6	0.6	4.7	0.64	8.8	0.21	4.4	0.32	13
3500	0.36	5.7	0.51	4	0.55	7.6	0.18	3.8	0.27	11
4000	0.32	4.9	0.45	3.5	0.48	6.6	0.16	3.3	0.24	9.9
5000	0.25	3.9	0.36	2.8	0.38	5.3	0.13	2.7	0.19	7.9
6000	0.21	3.3	0.3	2.3	0.32	4.4	0.11	2.2	0.16	6.6
7000	0.18	2.8	0.26	2	0.27	3.8	0.09	1.9	0.14	5.7
8000	0.16	2.5	0.23	1.8	0.24	3.3	0.08	1.7	0.12	4.9
9000	0.14	2.2	0.2	1.6	0.21	2.9	0.07	1.5	0.11	4.4
10000	0.13	2	0.18	1.4	0.19	2.6	0.06	1.3	0.09	3.9
Capacitor (C) values = microfarads (µfd) Coil (L) values = millihenries (mHy)

Narrow Band Pass for 8 Ohm Load - Mid-Bass Loudspeakers
Crossover Frequency	1st Order 6dB		2nd Order 12dB		3rd Order 18dB
Hz	_L1_	_C1_	_L2_	_C2_	_L3_	_C3_	_L4_	_C4_	_L5_	_C5_	_L6_	_C6_
100 - 250	8.4	119	10.6	94	12	84	12.8	80	5.6	178	4.2	234
100 - 300	6.4	133	12	70	9	94	9.5	89	6.4	133	3.2	265
100 - 400	4.2	149	13.5	47	6	106	6.4	99	7.2	89	2.1	298
100 - 500	3.2	159	14.4	35	4.5	113	4.5	107	7.5	66	1.6	318
60 - 200	9.09	232	21.01	100	12.86	164	13.5	156	11.1	191	4.55	464
60 - 300	5.31	265	24.02	59	7.5	188	7.9	178	12.6	111	2.65	531
70 - 200	9.79	185	16.72	108	13.85	131	14.6	124	8.79	199	4.89	370
70 - 300	5.54	218	19.73	61	7.83	154	8.2	146	10.4	116	2.8	436
70 - 400	3.86	235	21.23	43	5.5	166	5.7	158	11.2	81	1.9	469
80 - 200	10.6	149	13.51	117	15	106	15.8	100	7.1	223	5.3	298
80 - 300	5.79	182	16.51	64	8.4	129	8.6	123	8.7	122	2.9	365
80 - 400	3.98	199	18.01	44	5.6	141	5.9	133	9.48	84	1.9	398
85 - 200	11.07	135	12.18	122	15.7	95	16.5	90	6.4	232	5.5	269
85 - 300	5.92	168	15.19	65	8.37	118	8.8	113	7.99	124	3	336
85 - 400	4.04	184	16.69	45	5.72	130	6	124	8.4	85	2.1	369
Capacitor (C) values = microfarads (µfd) Coil (L) values = millihenries (mHy)

Car Audio / Passive Crossovers, 8 Ohm Reference Charts