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Discussion Starter #1
Keep in mind that length is a factor here as well. If you're doing a long run (>20 feet), you should use one size larger. It doesn't hurt to use a wire size that's larger than necessary, but it will usually cost more and can be more difficult to install.

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.
 

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Discussion Starter #3
I know, I hope some mods will come and see this, I would like to see it be sticked for future reference
 

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lots of good info there. definitely needs to be stickied :thumbsup:
 

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2006 chevy
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Nice info but one question.. Are the Watts Ratings RMS or Peak? I guess I need to upgrade my speaker wire..
 

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Discussion Starter #8
I wouldn't recommend using peak power ratings for anything, imho they are garbage used as marketing tactics for companies like Pioneer and Kenwood to make consumers think they are getting more then they actually are. RMS is always the way to go and these are for RMS ratings.
 

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2007 chevy trailblazer_ss_3ss
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I like this guide, but the only thing I see wrong is that there's no length of wire noted.

The shorter a wire at a given gauge, the more amperage it can carry.

So for example, a 4g wire at 5 feet can safely carry more amperage than a 4g wire at 25 feet.

Here's a good link. It only goes up to 70A, but I'm sure using a little imagination and knowing what amperage your system's maximum is, you can determine the size.

http://www.engineeringtoolbox.com/amps-wire-gauge-d_730.html
 

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Discussion Starter #11
Keep in mind that length is a factor here as well. If you're doing a long run (>20 feet), you should use one size larger. It doesn't hurt to use a wire size that's larger than necessary, but it will usually cost more and can be more difficult to install.

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.
I like this guide, but the only thing I see wrong is that there's no length of wire noted.

The shorter a wire at a given gauge, the more amperage it can carry.

So for example, a 4g wire at 5 feet can safely carry more amperage than a 4g wire at 25 feet.

Here's a good link. It only goes up to 70A, but I'm sure using a little imagination and knowing what amperage your system's maximum is, you can determine the size.

http://www.engineeringtoolbox.com/amps-wire-gauge-d_730.html
there is a note about length, but when would u only use 5 ft? most vehicles take around 12-17 ft..
 

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there is a note about length, but when would u only use 5 ft? most vehicles take around 12-17 ft..
Major brainfart :p Didn't even bother to read that part honestly. I just skipped right to the meat :bonk:

Anyhoo, I still prefer the guides that show distance, wire gauge, and amperage/wattage.

Your guide is still very helpful though.
 

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avn 6620 install

Hello every one im new here so bare withe me here, im trying to install avn 6620 in 02 envoy my unit has a speed wire any one know were to locate that on the envoy and how abought the dimmer wire were can i tie that in at close to the head unit
 

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avn 6620

hello to all, i am trying to install an avn 6620 in 02 envoy has any one hade the experiacne doing that yet that can give me some pointers and were is the speed pulse wire at
 

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Are the power measurements you gave based on OFC wiring? A lot of guys out there are still using CCA which heats up a lot easier and is usually found to be a common contributing factor in most car audio fires! I think you should make mention of this somewhere in the OP.

CCA can be found and is usually found in Flea markets.. you're not saving money at all.. your actually paying much more for cheaper wiring.. saving a few pennies isn't worth burning down your ride or risking your life... Get the good stuff from the start and do your research on the wiring.. not all wiring that is said to be 4 gauge is 4 gauge either. Too many times guys came through my install bay and was using cheap off brand wiring on a huge ass amp and was wondering why their 4 or 1 gauge wiring was melting! Cut off the rubber insulation and inside the wiring would be around a 10 or 8 gauge wire.. The good stuff is expensive for a reason guys. If you didn't know.. now you do. Save up for the good stuff before investing into some crap flea market wiring! :thumbsup:


Notice the difference in colors.
 

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Also here is some comment's from other car audio forums that people who are still interested in CCA wiring should read and take into consideration. I'm not saying don't EVER buy it, if it is for you... but I just want you to know the dangers of running it as well. There are some application to which running CCA would be fine I'm sure. However I wouldn't be caught on my worst day running CCA in any of my car audio applications.


"I had seen that article, and a nearly 10% loss in amplifier output may not be audible, but I still wouldn't want to lose it, especially over a wire that I will probably buy once for my vehicle. I'd love to know which amp they used, probably something with a relatively tightly regulated power supply. A cheaper amp with a more loosely regulated power supply would probably lose more. I'd also love to know why they didn't just show voltage and amperage loss across the cable.

Power cable is really not that expensive. CCA was made for the bottom feeders of car audio (no offense to anyone using it). Simply put, it doesn't perform as well as copper. It was an easy way for the Chinese to make a cheaper product, and reduce shipping costs (cca reduces weight significantly)

You can sugar coat it, and tell yourself the difference is negligible, but it's still a substandard performing product. After researching drivers, trying out different amps, scrutinizing over this processor
vs. that processor... Why would you choose a substandard wire when there are clearly better wires available? "
 

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cca isnt the antichrist, but yeah you should not be using the ampacity in the OP to determine your fuse size on a cca run. figure its probably 25% more resistive... so a good rule of thumb is to treat cca like one size smaller copper. for example, fuse 0ga CCA like you would 2ga copper, around 250a

a lot of older homes have large aluminum wire for the high current runs, from the meter to the fuse box, as well as to the oven and dryer. but they are usually oversized compared to their copper equivalent.
 

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Keep in mind that length is a factor here as well. If you're doing a long run (>20 feet), you should use one size larger. It doesn't hurt to use a wire size that's larger than necessary, but it will usually cost more and can be more difficult to install.

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.
Liken Post..
Awesome,, Breakdown of
Wiring..Nice Job.!!!
 

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Keep in mind that length is a factor here as well. If you're doing a long run (>20 feet), you should use one size larger. It doesn't hurt to use a wire size that's larger than necessary, but it will usually cost more and can be more difficult to install.

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.
Hello I was gonna post this question but I'm hoping to find someone who knows and you sound like you might know I'm trying to hook up a aftermarket radio and there is 3 yellow 12 volt constant wires do you know what goes to them besides red power I'm 45 and the last time I installed a radio was probably in my 20s hot ground and speakers lol
 
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