Passive Crossovers 4 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

4 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 4 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	12.7	796	18	563	19.1	1058	6.37	530	9.5	1592
60	10.6	663	15	468	15.9	882	5.31	442	7.9	1326
70	9.1	568	12.8	401	13.6	756	4.54	379	6.8	1137
75	8.5	531	11.9	375	12.7	706	4.24	354	6.4	1061
80	7.9	497	11.3	352	12	662	3.97	331	5.9	995
85	7.5	468	10.6	331	11	623	3.74	312	5.6	936
100	6.3	398	9	281	9.6	529	3.18	265	4.8	796
120	5.3	331	7.5	234	7.9	441	2.65	221	3.9	663
125	5.1	318	7.2	225	7.6	423	2.55	212	3.8	637
150	4.2	265	6	188	6.4	353	2.12	177	3.2	531
200	3.18	199	4.5	141	4.8	265	1.59	133	2.4	398
250	2.55	159	3.6	113	3.8	212	1.27	106	1.9	318
275	2.32	145	3.27	102	3.5	192	1.12	97	1.7	289
300	2.12	133	3	94	3.2	176	1.06	89	1.6	265
400	1.59	99	2.25	70	2.4	132	0.79	66	1.2	199
500	1.27	80	1.8	56	1.9	106	0.64	53	0.95	159
600	1.06	66	1.5	47	1.6	88	0.53	44	0.79	133
800	0.79	50	1.13	35	1.2	66	0.39	33	0.59	99
1000	0.64	40	0.9	28	0.95	53	0.32	27	0.48	80
2000	0.32	20	0.45	14	0.48	26	0.16	13	0.24	40
2500	0.25	16	0.36	11	0.38	21	0.13	11	0.19	32
3000	0.21	13	0.3	9.4	0.32	18	0.11	8.8	0.16	27
3500	0.18	11	0.26	8	0.27	15	0.09	7.6	0.14	23
4000	0.16	9.9	0.23	7	0.24	13	0.08	6.6	0.12	20
5000	0.13	8	0.18	5.6	0.19	11	0.06	5.3	0.1	16
6000	0.11	6.6	0.15	4.7	0.16	8.8	0.05	4.4	0.08	13
7000	0.09	5.7	0.13	4	0.14	7.6	0.05	3.8	0.07	11
8000	0.08	4.9	0.11	3.5	0.12	6.6	0.04	3.3	0.06	9.9
9000	0.07	4.4	0.1	3.1	0.11	5.9	0.04	2.9	0.05	8.8
10000	0.06	4	0.09	2.8	0.1	5.3	0.03	2.7	0.05	7.9
Capacitor (C) values = microfarads (µfd) Coil (L) values = millihenries (mHy)

Narrow Band Pass for 4 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	4.24	239	5.4	188	6	169	6.32	160	2.84	356	2.12	478
100 - 300	3.18	265	6	141	4.5	188	4.74	178	3.16	267	1.59	531
100 - 400	2.12	298	6.75	94	3	211	3.16	199	3.55	178	1.06	597
100 - 500	1.59	318	7.2	70	2.25	225	2.37	214	3.79	133	0.79	637
60 - 200	4.55	464	10.5	201	6.43	328	6.77	312	5.53	382	2.27	929
60 - 300	2.65	530	12	117	3.75	375	3.95	356	6.34	223	1.33	1061
70 - 200	4.9	370	8.36	216	6.93	261	7.29	248	4.39	411	2.45	739
70 - 300	2.77	436	9.86	122	3.92	308	4.12	293	5.19	232	1.38	872
70 - 400	1.93	468	10.6	85	2.73	331	2.87	315	5.58	162	0.96	938
80 - 200	5.31	298	6.75	234	7.5	211	7.89	200	3.55	446	2.65	597
80 - 300	2.89	365	8.26	128	4.09	258	4.31	245	4.34	243	1.5	730
80 - 400	1.99	398	9.01	88	2.81	281	2.96	267	4.74	167	0.99	796
85 - 200	5.56	269	6.09	245	7.83	190	8.24	181	3.21	468	2.77	538
85 - 300	2.96	336	7.59	131	4.2	237	4.41	225	3.99	249	1.48	671
85 - 400	2.1	369	8.34	89	2.86	261	3.01	248	4.39	170	1.01	737
Capacitor (C) values = microfarads (µfd) Coil (L) values = millihenries (mHy)

Car Audio / Passive Crossovers, 4 Ohm Reference Charts