thiel cs 2.2 muffle sounding and very low treble

hi i have an peculiar problem with my thiel cs 2.2 current system is
coda csx power amparc ls 26 preamparc ls22 preamplumin t1ridge street audio speaker cabletransparent audio icsi am not able to get sweet spot and good highs . sound is muffled. and also changed amp to mcintosh ma 7900 treble is little bit improved but not mellow. inputs needed where the system is mismatched. any upgrades to speakers to be done on cross overs or something. inputs needed.regards

Yeah, most likely some drivers aren't working.  The 2.2s are supremely enjoyable neutral speakers, but the first order crossovers mean each driver plays a very wide frequency range.  I wouldn't be surprised if they sound muffled because only the woofer is working or only the woofer and midrange are working.  Turning down the volume and listening to each driver closely is a good idea.  Listening to one speaker at a time is a good idea.  
checked every thing for 2 days. all drivers a re working fine. trble is low. but in some songs played like amanda mcbroom treble is ok but not great bass is trying to check the tweeters and 68 ohms resistor connected to tweeters. and finally thinking of to recap the crossovers as my technician is claiming it could e the main culprit of uneven frequencies.inputs needed

Definitely check for blown drivers or crossover components.  Thiel 2 2's are quite bright with almost any amp.