Good speaker to pair with MA5100?

A speaker should not sound like it has a blanket over it. Better speaker wire will not magically take the blanket off. Something else is wrong.

Before you spend a dime, make sure the MA5100 is properly functioning. If you find that it is, then explore the position of your speakers relative to the listening position in you room. I cannot emphasize this enough. If I space my speakers too far apart from where I listen, I can the high frequency response diminish too. Also, look at your room? Lots of soft material absorbing the high frequencies? Lots of heavy, plush furniture? Carpeting? All will contribute in the overall performance of your system.

Thank you both very much for the info and suggestions. I will try to set the speakers up with a different amp this weekend. I have a yamaha aventage reciever in my HT I can try to see if it has different results. The MA5100 was recently fully serviced by Terry DeWick in TN, so I am confident that it is working properly, but I will check. I can also use my HT speakers with the Mac to see if it helps (sony SSF-7000's).

The room certainly could be the culprit. It is probably the most in-ideal listening room. Large room with a couple of couches and lost of children's toys, bean bags etc (we have 3 20 mo olds!), lots of windows(no window treatments)The speakers are backup up against wainscoting so the kids don't pull the wires out. So, it could certainly be due to listening area/config. I will also play with this to see if I can gain improvement.

Thanks again!

The speakers are backup up against wainscoting so the kids don't pull the wires out.

Bass will be reinforced with any speaker against the wall affecting the balance of the overall response. Also, if the Heresy is sitting directly on the floor without the optional risers, this will reinforce the bass as well, so a double whammy. If you determine the speakers are OK and decide to use them, I would still recommend getting a pair of these risers,

http://www.critesspeakers.com/heresy-slant-risers.html

assuming you do not currently have risers.

Thanks for the link. Mine do have a riser, but it is level not tilted. I do like the idea if the tilted risers.

I ran Ohm Walsh 2-100s3 speakers with my MA5100 for 6 months plus. It worked pretty well. You might check out the Ohm Micro Walsh thread here. The speakers should be a lighter load on the 5100. I love Ohms and have had various models. They tend to work well for a variety of music and have a great tryout policy.

BTW, love to get you take on the gains from the refurb on the 5100. I have put mine away as it was having issues in one channel. I had Terry rework a MC250 for me which I am using now. I know he does good work. Just curious what a fellow consumer hears on a reworked model?