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Imp rise isn't that complicated. Being able to work with it might be but it's not hard to understand it lol

Quote:

Originally Posted by madwarrior (Post 644173)

I am gonna be getting a duel 1 ohm per coil sub should I get a 1 or 2 ohms. I am gonna be running the sub at .5 ohms but with imp rise if I went with 2 ohms I would get the most out of the amp if my ohms get high from the imp rise. This is for competing a single sub setup. I wan told by one pro to go with the 2 ohms because after imp rise it may become almost 3 ohms higher anyways without knowing. I just wanted a few other peoples advice.

Burp or daily?

Daily = rated impedance

burp 12V 0.5 16V 0.7 min.

Quote:

Originally Posted by Lessy (Post 644365)

Just so we're clear here. Impedance rise decreases with more power. So low power, high rise. As power increases, rise lowers.

High efficiency boxes will have alot more rise than 3x ;)

Perfect, Les.

It took me a whole year of testing to find out, initially I thought it could be a clipped signal measurement error, but no, It is plain an simple an overpowering behaviour.

While subwoofer power handling didnt change that much throughout the years, output amp power did, and now it does not take much to push the coil far from xlim limits, specially if you consider the smaller amp we currently sell in north-america is a 5000W amp. The weaker one.

Coil traveling outside the gap = less windings inside the magnetic field, less back electromotive force acting = less electrical opposition to movement = less impedance rise = higher current

This happens on both daily and SPL systems, I was fortunate enough to test it on low frequency, high frequency (bass range), street class, SS class, extreme class, bass race, 150, 160, 180dB, you name it.

Regarding voltage, yes, with our design you have more voltage, with more voltage you can send more power. Impedance is the opposition to alternating voltage, so if the impedance is high, just send more voltage and you get your power (P=VxI).

Higher impedance coils = louder. Some people think different because back in days the only way to pull decent power was using ultra low Re coils, since most amps had low voltage capabilities. Guess what, you dont need to do that anymore.

so what's the consensus here?

Murilo its just for burps. So the more power your giving the amp the higher the ohms has to be? So if your doing a 12v setup it can handle a .7ohm burp?

Quote:

Originally Posted by madwarrior (Post 644421)

So the more power your giving the amp the higher the ohms has to be? So if your doing a 12v setup it can handle a .7ohm burp?

:smilie_da:dunno:

Thank you for your input and taking your time to share your knowledge Murilo. Very interesting!

Ya Murilo is very helpful.

Most people are on this site actually lol.