Is my amp the problem?

my woofers are 86-87db sensitivity. My mid/tweeters are 90db,

BTW, I have to wait for the admin to approve my registration to the emotiva site.
 

So, if you have an lpad on the mids/tweeter, you can remove it and have absolutely no wasted power at all! Though, you might want some attenuation somewhere. Even 1 db on the woofer can mean the difference between something "too warm" and something "just right" (or even something "bass shy").

agreed. usually you don't want to put any resistors in line with the woofer, right?. BTW, the speakers are my design and I use mills or mundorf resistors to pad down when needed. high now I have them running wide open!! I was hoping an amp might have some adjustment.. Just got a recommendation from someone about ART SLA-2. Looks to be pro sound. Not sure I want to go that route unless I know for sure its good.

The input impedance of the ART (Applied Research and Technology) SLA-2 is 22K unbalanced and 44K balanced, the latter probably corresponding to 22K per leg. Too low to be optimal, or even close to being optimal, when driven in parallel with your Modwright amp by the LS100.

Also, the fact that its rated maximum power into 4 ohms is only 40% higher than its rating into 8 ohms says nothing positive about the robustness of its design.

I’ve used some other ART products for non-audiophile purposes, and in those non-critical applications I found them to be an excellent value. But I suspect that in a high quality audiophile-oriented system they would likely be disappointing, even if no impedance or other technical issues were present.

Regards,
-- Al