what does ohms and db mean?

[saprano]

im getting my system today(sig)and need to know what this means and does, the speakers im getting says it has an impendance of 4 to 6 ohms, and 89 db. and i just got my onkyo yesterday and it says any speaker with an impendance of 4 ohms or more but less than 6 i should set the impendance to 4 ohms. anyway i just need some info on whats the meaning of this stuff, and what does it do, thanks

[pedigree]

db is decibles and ohms is a unit of measure i think for electricity something like amps or volts... wiki it!

[fridge74]

ohms is the electric measure of resistance

[saprano]

Originally Posted by pedigree

db is decibles and ohms is a unit of measure i think for electricity something like amps or volts... wiki it!

yep your right i just wikied it, bassicly it has do power and volts- db http://en.wikipedia.org/wiki/Decibel ohms- http://en.wikipedia.org/wiki/Ohm thanks

[saprano]

oh one more question, what does bi-amping do?

[saprano]

Originally Posted by Strannix136

Bi-amping is usually used in PA applications. One amp is used to power the low frequencies and another amp is used for the mid and high frequencies.
Check out this link:
http://forum.ecoustics.com/bbs/messa...79/109419.html

thanks alot for that link!

[d_rob1031]

Just a heads up, don't let db make a decision for you. It takes 3db for the human ear to notice a difference in volume. In other words, if there's a tiny difference between 2, don't automatically think the higher is better, you won't notice a difference.

edit: gah, this take me back to college and circuits class. yuck.

[Deciazulado]

Originally Posted by musicman1999

Ten DB is not a doubling of volume, nor is 3 DB a doubling of power. It takes double the power to increase the volume by 3 DB and every further 3 DB increase requires double the power,

Uh? you just said it, mate.

3dB is a doubling of power, and it takes double the power to increase the volume by 3dB and every further 3 dB increase requires double the power

*scratches head

Originally Posted by musicman1999

example 1 watt=78db, 2 watt=81db, 4 watt=84db, 8 watt=87db, 16 watt=90db, 32watt=93db, 64watt=96db, you get where i am going,

yes those 3 dB's increases take a doubling of power.

Originally Posted by musicman1999

so doubling the volume 156db would require thousands of watts.Of course 156db you could not stay in the room and your speakers would explode.

bill

err "doubling the volume 156dB"? That's not the way you double the volume. 156dBs is NOT double the volume of 78dBs. it's 78 dBs MORE. (Almost 256 times (2 raised to the 8th power) louder!).
Doubling the volume (making the perceived sound twice as loud roughly) is 10dB so it would go from 78dBs to 88dBs which would take in your example going from 1 watt = 78dBs with your speaker to 10 watts = 88dBs with your speaker. If you want it to be again twice as loud, (98dBs) you go up to a 100 watts, and so forth.