Joined

·
4,511 Posts

**Power Wire:**

10 gauge: ~35 amperes

Class D (~70% efficiency) - <350 watts

Class A/B (~50% efficiency) - <250 watts

8 gauge: ~55 amperes

Class D (~70% efficiency) - <550 watts

Class A/B (~50% efficiency) - <400 watts

6 gauge: ~87 amperes

Class D (~70% efficiency) - <875 watts

Class A/B (~50% efficiency) - <625 watts

4 gauge: ~140 amperes

Class D (~70% efficiency) - <1400 watts

Class A/B (~50% efficiency) - <1000 watts

2 gauge: ~220 amperes

Class D (~70% efficiency) - <2200 watts

Class A/B (~50% efficiency) - <1500 watts

1/0 gauge: ~350 amperes

Class D (~70% efficiency) - <3500 watts

Class A/B (~50% efficiency) - <2500 watts

2/0 gauge: ~440 amperes

Class D (~70% efficiency) - <4400 watts

Class A/B (~50% efficiency) - <3000 watts

4/0 gauge: ~700 amperes

Class D (~70% efficiency) - <7000 watts

Class A/B (~50% efficiency) - <5000 watts

**Speaker wire:**

22 gauge: ~2.2 amperes

8 ohms - <36 watts

6 ohms - <27 watts

4 ohms - <18 watts

3 ohms - <13.5 watts

2 ohms - <9 watts

1 ohm - <4.5 watts

20 gauge: ~3.4 amperes

8 ohms - <96 watts

6 ohms - <72 watts

4 ohms - <48 watts

3 ohms - <36 watts

2 ohms - <24 watts

1 ohm - <12 watts

18 gauge: ~5.5 amperes

8 ohms - <240 watts

6 ohms - <180 watts

4 ohms - <120 watts

3 ohms - <90 watts

2 ohms - <60 watts

1 ohm - <30 watts

16 gauge: ~8.7 amperes

8 ohms - <600 watts

6 ohms - <450 watts

4 ohms - <300 watts

3 ohms - <225 watts

2 ohms - <150 watts

1 ohm - <75 watts

14 gauge: ~13.7 amperes

8 ohms - <1500 watts

6 ohms - <1125 watts

4 ohms - <750 watts

3 ohms - <563 watts

2 ohms - <375 watts

1 ohm - <188 watts

12 gauge: ~21.8 amperes

8 ohms - <3800 watts

6 ohms - <2850 watts

4 ohms - <1900 watts

3 ohms - <1425 watts

2 ohms - <950 watts

1 ohm - <475 watts

10 gauge: ~34.6 amperes

8 ohms - <9600 watts

6 ohms - <7200 watts

4 ohms - <4800 watts

3 ohms - <3600 watts

2 ohms - <2400 watts

1 ohm - <1200 watts

8 gauge: ~55 amperes

8 ohms - <24000 watts

6 ohms - <18000 watts

4 ohms - <12000 watts

3 ohms - <9000 watts

2 ohms - <6000 watts

1 ohm - <3000 watts

**Maximum Fuse Size**

00 awg 400 amps

0 awg 325 amps

1 awg 250 amps

2 awg 200 amps

4 awg 125 amps

6 awg 80 amps

8 awg 50 amps

10 awg 30 amps

12 awg 20 amps

14 awg 15 amps

16 awg 7.5 amps

Taken with permission from JMac @ Caraudio.com

Hope this clears up some confusion.