Suddenly my speakers sound like they are bown out - like someone turned the bass up really high on a very cheap woofer. I've been using them through the headphone port of my presonus firebox. This could have been my mistake and the cause of the problem - I don't know. I have tried them through additional sources with the same results.
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Not much info to go on here, but my thought would be you have blown the woofers in the speakers, or the crossover in the cabinet, that separates the highs from the lows. . If you can touch the woofers with your hand, spread you hand wide over one, and try to move the cone. If it makes a scraping sound , the speaker is blown. If not,the crossover is probably damaged.
The first thing to do is to check the resistance of the voice coil. Get an ohm meter & place one lead on each of the speaker terminals. If a value of 0 ohms results, or no reading at all, the voice coil is blown.
If you are pressing in, and suddenly gives way, my guess would be that the excursion of the speaker was too grand (common with car stereo, everyone loves bass) and the wires that wrap around the voice coil of the speaker were broken from the speaker inputs.
It is possible to recone the speaker, but by the time you track down a recone kit (highly unlikely that it is even available) you would be rather deep into the project.
Long story short: check the speaker terminals with an ohm meter. If you get a resistance, they should work with free woofer movement. No resistance = blown woofer.
you have one of two problems.1) the woofer is blown(most likely) or 2) the crossover is fried(rare). Take the woofer out and press on the speaker cone(softly). If there is a scratchy feeling when you move it or if it doesn't move at all, you'll either need a new woofer, or get that one reconed. good luck.
You may not like this but in the audoi/video community bose is overpriced middle of the road HTIB broduct. you can get a better system for a LOT less than what you payed.
As for the speaker issue' they are bottoming out because those drivers that they use AKA. The cheap $35.00 woofers and $2.00 tweeters were not meant for the application that they use them for, they are the same drivers that they use in their bookshelf speakers and are being ovelrloaded by the extreme LFE and HF content that is being fored through them.
If you have a Ohm Meter, check the resistance to the speakers. If it is very high, the speakers are burned, (or the crossover is (just capacitors, and resisters...cheap)). If it is close to 4 ohms check the wiring and connectors..to and at the speakers, most likly the receiver/amp is not blown.