Windowsx...remember, the bass frequencies are omnidirectional so there orientation whether pointing bacwards, forwards, or on the side should not affect transparency in any way. Also, on the Parsifals, the bass modules are flexible so you can have them pointing bacwards or forwards. So if your room forces you to place speakers fairly close to the rear wall and the bass module pointing bacward is resulting in too much bass, you can point them forward. In this regard the Parsifals are a bit more flexible in terms of speaker placement than the Miras. At the very least, you should go listen to the Parsifals at a dealer's store to get an idea of what they sound like (this is the dealer in Bangkok: http://www.hienaudio.com/index.php. If you read the reviews on the speaker, you will see that one of their strengths is how transparent they are. And imaging/soundstaging is superb.
As for the Miras, Rockport's web site says they are distributed by http://www.inventive-av.com/hiend.php in Bangkok. You should definitely go listen to them at that dealer. This dealer does not have Spectral amplification but they do have Karan Acoustic SS amps, which are also very very good and I expect will be a good match with the Rockport Miras. Check both of them out and let us know how you decide to proceed. Good luck.
As for the Miras, Rockport's web site says they are distributed by http://www.inventive-av.com/hiend.php in Bangkok. You should definitely go listen to them at that dealer. This dealer does not have Spectral amplification but they do have Karan Acoustic SS amps, which are also very very good and I expect will be a good match with the Rockport Miras. Check both of them out and let us know how you decide to proceed. Good luck.