The missing piece

Other pieces I got the greatest impact with was a Musical Design t100 amp and the sp1 preamp, in fact I was so impressed with these components I sold my Parasound a21 and p5 so I would have the funds to buy them.

"What is a piece of equipment you added to your system and it made such a huge impact you knew you would never get rid of it?"

Its not about 1 piece that fixes everything. System matching is the most important part of the system. You can have plenty of great components, but if they are not properly matched, you won't be able to hear what they can do.

Oh I hear what they can do. and I agree with you. but one thing I would never part with is the Summits.

For me definitely my Deja Vu Audio El-34 PP tube amp, especially after getting it recapped with NOS Aerovox caps. Another piece I love and can't see ever parting with is my Yamamoto YDA-1 Dac just a superbly musical piece.

Couple years ago I had to give up my listening room which was nicely proportioned for my system. I was forced into a small nearly square room approximately 12x12. Even though I was able to move all my room treatments in, the room was a problem. The biggest problem in the square room was the loss of 3D imaging.  At the time I was using a pair of Thiel 1.6s which in the old room through a very creditable 3D image with depth both behind and in front of the speakers. All gone. The solution was to set the system up in a diagonal configuration. The results were simply amazing. I now have the deepest soundstage I've ever experienced. Instruments as well as vocals are located firmly on a stage in front of me, the speakers are absolutely disappear in the music.  I've tried a few different speakers in this configuration and all but one speaker took advantage of the layout demonstrating exceptional imaging. Not sure how long this room is going to be the system's home. But I'm not looking forward to trying to recreate this sound in a standard room.