First if a subwoofer is rated at 750RMS on music' date='900RMS sound wave's(I would guess sine wave's) and 2500 Peak power what would all this mean. [/quote']
I have no idea what "sound waves" means; never heard that expression used in reference to power ratings. But for all intents and purposes, given the extremely poor labeling, I would stick with the 750w "music" RMS figure and forget the others. The difference between 750w and 900w is negligible anyways.
Isn't a sub's RMS half it's max most of the time
It doesn't really matter. Max power handling is completely irrelevant to anything and everything.
RMS is all that is important.
It's relationship to Max power is not.
and has any one every heard of a sub being rated with sound wave's ?
Never, actually.
Next what does the peak power of a speaker REALY mean
Absolutely nothing
....is this what it can take for burp's on sine waves(providing you have enough Rms power to reach the sub's peak power) or is it some meaning less figure ?
It's a meaningless figure.
Just wondering how you would figure what a sub could take be for it blow's and for how long you could keep it there ?
It's enclosure and rating method specific. In some cases, the RMS power is simply a thermal power handling limit based on (for example) playing white noise for a certain period of time through the driver. In which case, the driver will typically be able to handle a decent amount of power over the rated power handling with musical content. In other cases, though, the RMS power rating is an average designated by the company for a safe power level to be played through the driver in varying enclosure designs.
But in all cases, varying enclosure designs will affect the actual mechanical power handling of the driver. For example, a subwoofer being ran infinite baffle or in a large sealed enclosure will have a diminished mechanical power handling capacity. So it is entirely possible to damage a subwoofer with less than it's "RMS" rated power, depending on the enclosure (or lack thereof).
All in all; if you use your head when playing the driver, it should be fairly easy to tell when failure is about to set in. Most subs will tell you when they are unhappy with the level of power they are receiving. And be mindful of the affects of your enclosure on the mechanical limits of the driver.
Finaly I have heard all over the net and at many audio shop's that the only way to make a subwoofer go louder(once it's realy loud) is to double or tripple the Rms power to the sub. Also you could add more sub's( keeping the same Rms power as your other's,of course you would need more Rms power when dividing bewteen more speaker's) to make it louder. Is this right,I was told double your sub's to gain "3 DB'" or double your power to gain "3 db's. I know these are only refrence number's and used for example but would eather one make a noticable diffrence and wich one would be more noticable to the ear.
Theoretically, if you double the power to a single subwoofer you gain 3db.
Theoretically, if you double the cone area without increasing power you gain 3db.
Theoretically, if you double both cone area and power, you gain 6db.
Of course, this does not take into account real-world occurances such as power compression, etc.
