Just to start....I am a pro audio/video design engineer....


Yes reliabilty of amplifiers and speakers goes down as the ohm load increases....and just for clarity ohms is resistance so when i say an ohm load is increased the numbers are going down...

now....yes it is possible to hear distortion from lowering a speakers ohm rating in a subwoofer situation....this is all very dependent on the quality of amplifier selected.

Car audio is far different from pro audio but principles still exist in both and i have done custom car audio installations for 6 years now.

If you look at a amplifiers specification rating there should be somethign listed called THD (total Harmonic distorion)....i think you know where i am going with this.....

Depending on a trained ear someone can tell then difference at as little at 3-4%

The average listener however will be lucky to hear around 7-8%.

This applies in a subwoofer situation or midrange.

To answer the original posters question. Yes there are amplifiers out there that can do such a thing. These guys in the board would better guide you to those then myself.

With little knowledge in audio that you have increasing your ohm load will only but a nice fat whole in your pocket with not the results you are looking for.

This next follwoing statement is very generalized and is only for loud!

If you are looking for loud build yourself a ported box or better yet buy a bandpass box. Get some large subwoofers....what ever you can fit and look for ones with a high sensitivity rating....on top of that look at the rms rating of the subwoofer.....once you find what you like you match the speaker to an amplifier....

For car audio its very common to see a 1% THD so this wouldnt concern me at all.....if you see anythign more i would start to question it. Next buy an amplifier with a CEA power rating. This gaurantees you true wattage. Alot of companies use ....umm think of a nice word....phony....power claims. So sticking with somethign with this rating is a true and tride way. Now not all companies can afford this CEA stamp of apporval so there may be amplifiers on the market that are true and tride so you may have to take the advice of the people on boards such as this on the more umm smaller amplifier companies

Once a subwoofer is decided upon PM me and i will help you in wiring your subwoofers properly and pointing you in the right direction for an amplifier..

Hope this helps