I have a couple of suggestions which may or may not be popular here. The first and obvious suggestion is to change your speakers. The problem didn't exsist before the Hales, so you're right to suspect them. I'm not saying they are good or bad, just that if you don't like them, change them!
Now for the possibly controversial part. Please don't use cables as tone controls. All cables are supposed to do is transfer the signal from one component to the next. If you need an EQ, buy an EQ. Here's a great one:
http://www.behringer.de/eng/products/digitalprocessors/dsp8024.htm
A good EQ gives you versatility and flexibility. Versatility because you can correct for room modes as well as dial in the sound you want. Flexibility because you can adjust the sound for each recording to suit your taste.
Now for the possibly controversial part. Please don't use cables as tone controls. All cables are supposed to do is transfer the signal from one component to the next. If you need an EQ, buy an EQ. Here's a great one:
http://www.behringer.de/eng/products/digitalprocessors/dsp8024.htm
A good EQ gives you versatility and flexibility. Versatility because you can correct for room modes as well as dial in the sound you want. Flexibility because you can adjust the sound for each recording to suit your taste.