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Why do my stereo speakers occasionally not work until I crank up the volume?

It seems like the speakers "jolt" to life only when the volume level crosses a certain threshold. (About 40 to 50% of max volume.) Once the speakers come to life, the volume can be lowered again, and they continue work until I turn off the amp. I never noticed this before moving into my new place. I've tested different speakers and even a different tuner/amp. Could it be the speaker cable? The runs aren't that long - no more than 10 to 25 feet.
That's beacause, if you have a tune of particularly demanding bass then the subwoofer in each speaker can't produce any noise untill cranked above the level you're talking about. The speakers will be producing noise, just maybe under the the humans hearing range (20hz-2Mhz), however, when cranked above, it enters the hearing range and allows you to do this.
The only solution I can think of is to turn off all bass EQ's (equilisers) and turn on any treble EQ's. This may not work, if not, you'll just have to buy another set of speakers, or live with your problem.
 
source:www.audioannex.com