If are looking for cheaper speakers, the cheap ones on Amazon and Ebay, Pyle and Boss might work out for you.
I needed to replace my speakers, and wanted some cheaper components. I found a set of Pyle ones and was skeptical of the price and quality of them.
They sound great at most volumes, really high, they start to distort. It is almost like hitting a switch to make them distort.
But the volume was really, really high.
After being impressed with the quality vs the price of the Pyle, I decided to try a low profile 10" Boss subwoofer, and was also impressed.
The cheaper ones might not pass the audiophile test, but for average listener that wants decent speakers at a really good price, it might be worth a try.