Fritz carbon 7SE MK 2, Upgrade

@soix    Thank you so much for the post. You have hit the Quandary, spot on!!! I have to compliment you. As my analyst, you have uncovered the truth, that escaped me.. Your last statement about reconciling  the situation is exactly my dilemma.  I may try today to move the Pass into the room that is smaller, that houses my fritz speakers. That would be the best comparison test. 

Speaking of reconciling. Should I find the PASS is superior (laughing) my new dilemma would be a Coda 8 V1 or Coda S 5.5. I have no idea playing the FRITZ at 90db at 10' away,  how may watts are being used ?  Then, should I get the 5.5 version and put it in my shop with my 4ohm tektons , which are very easy to drive, or play it safe and get the 8, and be safer with additional WATTS being available? AND I WONDER, why I like BOURBON!!!!  Thank you, I THINK!   Robert

@robshaw ...I may try today to move the Pass into the room that is smaller, that houses my fritz speakers. That would be the best comparison test. ... 

Yep, and you'll know more [relatively quickly] once the 250.8 amp gets fully warmed and you play a few of your favorite test tracks on the Fritz speakers. 

To all that have assisted @decooney  The wife and I managed to move the x250.8 beast to the the room that houses the FRITZ carbons, small feat!!! As good as the ATI amp was(and it was) the Pass was far superior. Openness, clarity, speed, base,  mid range, etc. I guess I never realized how good the PASS amp was until I moved it to a new place, Impressive, my wife  thought so too. We lugged the PASS back to its home in my shop, the larger location. We were tempted to leave it with the FRITZ in the smaller room, after hearing it. Going to enjoy the FRITZ even more now that they have been awakened.  For those that would like to help? I'm now looking for a very good amp for Rock and ROLL for that smaller room containing the FRITZ.  My first choice is either the CODA 8 (most likely the V1) or the CODA S 5.5 . Would like to stay used if I can, The only thing that scares me about the 5.5 is that its only 50 watts classA) no AB after that. Suppose down the road i decided to purchase a pair of ATC speakers, wondering if the 50 watts would run a little shy at higher volumes????  If  anyone has some suggestions, that would be great. Starting to look as we speak. Robert TN     WOW! was that Pass good!

Since you like the Pass sound this X150.5 would be plenty even for ATC, but I think closer to $2500 is a more fair price than the $2900 on ask given age and it’s an older model (although not too old).  I think Coda is also a great choice.  Best of luck. 

https://www.audioasylum.com/messages/amp/19888/b-review-pass-laboratories-x150-5-amplifier-ss-b

MC462 or MC312 or one of the previous versions of those two.  I have an MA8900 I run with my Fritz.  I listen to rock often and it sounds outstanding to me.  This pairing sounds excellent, imho, with all music genres in general, but excels with rock.