2006-11-23 13:51:24 · 5 answers · asked by Fregia 1 in Cars & Transportation ➔ Car Audio
better get some welding lead :)
2006-11-23 13:53:57 · answer #1 · answered by Anonymous · 0⤊ 1⤋
Since we are in the audio section, amps is not a consideration for speaker runs.
The determination is found by knowing the "load" placed on the amplifier (2ohm, 4ohm, 8ohm).
But, the key is the ammount of resistence. Wiregages are the answer. 10ga is 1.00 per thousand feet, 12ga is 1.59, 14ga is 2.5 and 16 ga is 4.02.
Applied to speakers being fed by the amp, consider this. Wire gage, follwed by load, followed by max distance.
10ga, 2ohm = 60', 4ohm = 120', 8ohm = 240'
12 ga, 2 = 40', 4 = 75', 8 = 150'
14ga, 2 = 24', 4 = 48', 8 = 95'
16ga, 2 = 15', 4 = 30', 8 = 60'
These are the figures that will result in your amplifier using no more than .5dB (6%) of the amplifiers power to push the signal to even get it to the speaker. More than these lengths will rob significant power, usually resulting in a thermal shutdown, if the amp has this protection. If not, then you will also encounter problems with "current hogging", where the hottest output transistors try to hog all of the load, which heats them more, which makes the carry more, and so on. This is called thermal runaway, and is a problem with conventional bi-polar output devices, as they have a positive temperature co-efficient.
If your amp is using MOSFET output devices, these have a negative temperature co-efficient, which means as it heats up it becomes more resistive to thermal increase.
2006-11-27 13:33:01 · answer #2 · answered by Samurai Hoghead 7 · 0⤊ 0⤋
An 8 gauge wire would be fine. Check your local wal-mart. I believe that they have a guide book to look at for customers that want to install systems.
2006-11-23 13:54:25 · answer #3 · answered by Jesse D 2 · 0⤊ 1⤋
8 gage wire
2006-11-23 16:07:05 · answer #4 · answered by matt12882003 3 · 0⤊ 0⤋
what voltage? a.c. or d.c. ? single or three phase ?
2006-11-23 15:49:22 · answer #5 · answered by sterling m 6 · 0⤊ 0⤋