In summary, a parallel resistor will lower the total impedance, but any extra power generated by the amp into the lower impedance load will just go into heating the resistor.I was wondering if it is possible to drop the ohms on a single voice coil sub using resistors. The sub is currently at 6 ohms but i wanna run it at 3 ohms?
Some newer cars with the upgrade sound system actually have step-up SMPS power supplies in their amplifiers now. Mostly for the sub amp in stock DVD/surround sound systems. No standard connections, though, so it isn't easy to re-purpose them, same with the displays.Resistors do not make sound, instead they make heat and also heat the amplifier.
A 3 ohm speaker produces double the power of a 6 ohm speaker if the speakers are the same. Double the power sounds only a little louder because our hearing's sensitivity to loudness is logarithmic.
In 1966 a car radio used output transformers (instead of bridged amplifiers) to step-up the output voltage swing to produce 4W per channel in 8 ohm speakers. 4W in 8 ohms requires an amplifier with at least a 20V power supply voltage without using the transformers.
My 2005 car uses 2 ohms speakers with bridged amplifiers for high output power of about 26 Watts (which is about 104 Whats) at clipping per channel.
There was a stretch for a few years when the Good brands in audio were actually under-rating their amps, while the cheap ones were wildly over-rating theirs. Then in the late 90's, the ratings got fuzzy again when Rockford split between high end and more modestly priced amps (forgot their names, Punch and something else).lol yeah "peak" power. I had a 150W rockford fosgate amp that would put my "1000W" pioneer amp to shame.
Yeah that was around '02 and my rockford was 3rd hand acquisition from the 90's. it looked like this, but wider, and minus the end caps. If I were to get back into car audio, I would hit ebay looking for another one of these before I would go to the store and get one off the shelf.There was a stretch for a few years when the Good brands in audio were actually under-rating their amps, while the cheap ones were wildly over-rating theirs. Then in the late 90's, the ratings got fuzzy again when Rockford split between high end and more modestly priced amps (forgot their names, Punch and something else).
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by Jake Hertz