Originally Posted by fasfocus00
back in what day 2004? back when I first go into car audio (early 90s), there were plenty of amps that were rated at 4Ω under 25 watts per channel but could be ran down to 1Ω and a few at .5Ω. Soundstream, Orion, PG, and Lanzar were known for doing this IIRC they called them "cheater amps".
Back in the late 80's bridging an amp was unheard of. From what I remember, Sherwood was the first to allow bridging. They had a 4 channel amp that ran at 4ohms or 2 ohms per channel and could be run to 2 channels at 2 ohms in stereo and 2 channels bridged into 1 channel at 4 ohms, or all 4 channels bridged into 2 channels @ 4 ohms. There were 2 switches that could be set to stereo or bridged; 1 switch per side.
DVC subs became popular before this was an option. You could run a two channel amp that was only rated at 4 ohms per channel to a 4 ohm DVC sub and still have room in the trunk for groceries, kegs, golf clubs, etc.
Then, when more amps became bridgeable, 8 ohm svc subs became popular. That way you could run an amp that was, let's say, 100 ohms x 2 @ 4 ohms or 300 watts x 1 @ 4 ohms, to two subs and get 150 watts per sub opposed to 100 watts per sub. It wasn't much of an increase, but it was an increase. Especially since it was uncommon to have a sub that could handle more than 150 watts, RMS back then.
Then the "cheater" amps started. IASCA was formed and, at first, did not allow cars to even have their engines on while competing. They were trying to level the playing field so all the cars weren't relying on their alternators to win. At first, companies like Rockford Fosgate (and many others) started to rate their amps at 11.6VDC. This was the common voltage seen by the amp after the voltage drop from a 12.6VDC battery. At 14.4VDC they were rated much higher.
Then, as mentioned, the fad became winning smaller classes by using amps that were factory rated at something like 22 watts x 2 @ 4 ohms (Like Phoenix Gold), but could be bridged down to 0.5 ohms and put out 300 watts. Use two of these and you were still in the "100 Watt and Under" class, but were putting out 600 watts!!
This is when DVC subs became popular, once again.
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