Telarc recordings

Hi folks, does anyone know why Telarc classical recordings often sound opaque? By opaque I mean that the recordings don't sound transparent (a sort of see through quality like most DECCA recordings). Because of this sound character the music often sounds dull and lifeless. That's a pity because there are plenty good performances on this Label. What is the most likely explanation for this sound character? Is it because of the mics Telarc uses or recording equipment? Or is this actually how music sounds in reality? I visited Concertgebouw (Amsterdam), Davies Hall (San Francisco), the concerthall in Cologne, but they all sound quite transparent and not dull.