godzilla1978

no doubt someone has but it's probably too heavy and way to expensive. Can you amagine the price of a silver sub(well the voice coil at least!) would be!

Father Yuli

iTrader: (17)

how much power are you guys talking about?

did you think that the power handling doesnt actually increase? different type of coil, alum vs copper, might produce different imp rise. higher imp rise = you are able to feed more power, but might not actually mean the sub's power handling has increased any.

i have been wrong before tho.

Father Yuli

iTrader: (17)

in your particular case with the 1750.1 RD amp it wont make any diff if you go with a copper or alum coil. especially if the amp will be ran at 1 ohm. wont be enough power to make a difference.

godzilla1978

copper has lower electrical resistance than aluminum therefor the impedance rise should also be less. Isn't impedance rise because of heat in the coil? Less heat in the coil(because less resistance to the flow of electrons)should mean more power handling. What your saying is they would cancel each other out if you added more power(more heat in the coil). I think the qestion was if all things were equal which was better. The answer should still be a copper coil(I know I'm splitting hairs here!)

kevmurray

This is getting into power compression. A bit of heat build up leads to increased resistance which leads to more heat build up which leads to... There is a term called "the 1dB point" which simply means that when you double the power you only get a 1 decibel increase in acoustic output. Normally of course you would see ~3dB but due to diminishing returns much of the power is wasted (think about that when you decide to sell your 500W amp and buy a new 3kW amp). SPL competitors take note, allow your coils to cool before you burp.

I don't mean to knock anyone on this forum, but I always wondered why the industry was going in the direction of multi-kilowatt systems instead of efficiency. A speaker designed for efficiency would not only require a smaller (cheaper) amp but the reduced moving mass would reduce rattles. A big problem in cars. We could do away with our distortion prone class D amps, at least until better ones are available and end this nonsense about how many batteries and caps we should be running. SPL contests aside, low efficiency-high power systems are a back wards approach.

edit: What do you guys think?

danyman

iTrader: (1)

your right kev. back in the days was all about low power and high efficiency. but im pretty sure that the boxes were huge compared to today lol