View Full Version : speaker rms...

07-12-2007, 11:00 AM
If my speakers are rated 900rms and im running 700rms like my amp is rated, does it matter what i set the frequency on the amp, if i set my subsonic frequency down to like 30 or 25 hz, it wont over push my sub... Cause a guy once told my that at lower frequency's ur subwoofer moves slower and doesn't cool itself as fast so its easier to blow them at lower frequencies... i was just wondering if that was right?

07-12-2007, 11:09 AM
That's going to depend on the mechanical and thermal design limitations of the sub. Some subs are underrated and can take massive amounts of power with no ill effects. Others are rated at about what the manufacturer says, and still others are overrated and can't take the power the manufacturer states.

As a general guideline, too much power is better than not enough, as you can always keep the amp gain set at a lower level to deliver less power than what the amp is capable of delivering to the sub.

And by subsonic frequency, do you mean the subsonic filter on the amp itself? All that does is prevent very low frequency signals from being passed on to the sub. For example, if you have a sub in a ported enclosure tuned to 33 Hz, and the amp has a SSF with a 24dB/Octave slope and it can be set variably between 10-50 Hz, then you'll want to set it about 20-25% lower than the tuning frequency.

07-12-2007, 11:09 AM
not really... subsonic filter is to keep your sub from going too low for its suspension, as may be possible in a ported box.

07-13-2007, 11:14 AM
would 30hz in a sealed box be ok for a set of 15's, if i set the amp sub sonic frequency's to 30hz...