Issue with ProAc D40 speaker - any suggestions to resolve the issue

Hi,

I recently bought used ProAc D40R couple of months back, and driving them with Bluenode streamer —> Digital Audio company Marachino Class D Mono blocks.

After a month or so I realized that absence of the sound from one of the ribbon tweeter, showed it to local audio equipment dealer, they fixed the issue (it was loose tweeter harness wire), now I get the sound from both the tweeter.

Recently i compared these speakers against my exiting DIY Audio Nirvana 8” Alnico single driver speaker using ‘Spanish Harlem’ Track by Rebecca Pidgeon, to my surprise Audio Nirvana sounded more clear and I can hear all the details especially shakers in the left back corner and all other details while on ProAc D40r I can barely hear all those tiny details in the background to me that should not happen with ProAc being such great speaker especially with Ribbon tweeter, so just wondering What could be the issue, Can it be a Crossover Caps issue (as the person I bought these from mentioned those were in storage for almost a year and I read it somewhere here on audiogon thread that caps in crossover may go bad if you store it for long time). 

Really appreciate any recommendations/remedies to resolve the issue, eventually i will have take it back to audio dealer but just wanted to check on forum that if anyone else experiences this kind of issue and what was the solution.

Thank you,