Pass X150.5 or Odyssey Stratos monos?

nothing wrong with a bridged amplifier if done properly!

Really? then please show how to bridge this common simple Nelson Pass Threshold S300 amp "properly" so it’s just as good as the stereo version.
https://imgur.com/we3VoER

Um - let’s see. What should I choose a Lexus or a Kia. Sure Kia make some nice cars that people love and have great warranties and so on but so what. This is not a legit comparison by any stretch. 

I believe that the Odyssey Stratos monos are not bridged, and the use of the term "bridged" in their description (" RCA & XLR (bridged) inputs") is misleading.  There are several indications of that:

1) See the posts by me and Stereo5 dated 6-4-2018 in this thread.  Apparently the word "bridged" is confusingly used to refer to a direct connection between one of the two signal pins on the XLR connector and the signal pin on the RCA connector.

2) The specified power capability of the monos is only slightly higher than that of the stereo version (180 watts vs. 150 watts into 8 ohms).

3) The specified damping factor of the monos is higher than that of the stereo version (>800 vs. >500).

That said, and although I have no experience with Odyssey products, as a Pass owner (XA25) I would second the comment by @fsmithjack  above.  The two brands are not in the same league IMO. 

Good luck.  Regards,
-- Al

almarg
I believe that the Odyssey Stratos monos are not bridged

Al have a close look at my first post links to the "Stratos stereo" and then the "Stratos mono", and I’ll see if I can get some better shots if you still can’t see it.

This is better shot of the stereo
The Stereo https://ibb.co/0yHZFTM
The Mono has a transformer case and some extra PS caps around it, but it’s a bridged stereo Stratos https://ibb.co/9ZqDw18

Cheers George

I have been following this thread from the start.  As the OP stated, only two options were to be considered: Pass and Odyssey.  But there actually is a logical third option: Symphonic Line (SL).  Have a look at the link below and I will explain further.

http://https//www.theabsolutesound.com/articles/a-995-wonder-amp/

Jonathan Valin states that the circuit in the Odyssey is the same as in the SL RG-11, the lowest model in the SL lineup.  Maybe so, but that is where the similarity stops.  I have an older rev 15-20 years old) of the RG-11.  I borrowed a stereo Stratos amp a couple years ago.  I believe the Stratos was higher power rated, but the comparison was no match.  The SL had so much more clarity and refinements throughout it was not even close!  I honestly don't know how JV went so crazy for the Odyssey amp, and referenced h super-fi amps in his coismparisons.  The Stratos simply sounded like a budget amp to me.  And here I had a very early version RG-11, and it walked all over the nearly new Stratos.

I have no idea what is going on with SL amps, but they are just incredibly stunning.  I got the RG-11 for $700 a few years ago and I am absolutely positive that nothing on the new or used market can touch it for anything even close.   JV did mention it was 5K at the time of his review, and I can clearly understand why!  I have gone through a ton of amps trying to make my speakers sing.  Even the coveted Nelson Pass SA1 mono amps of years ago, that were able to drive the woofers of the Sonus Faber Amati speakers in a most awesome fashion, were easily outclassed by the RG-11 in clarity, tonal coherency and mid and upper-octave refinements.

I had heard of SL a few times along the way, but this little RG-11 amp can do a darn good job driving the big Sound Lab A1 speakers and could even make the SF  speakers sing fairly well too at medium volume.  Inserting the Stratos to drive the SF's, and the result was severely dimensionally flat.  So Rolf Gemein, chief SL designer, just does something special here.

I have since purchased a new version of the SL RG1 amp.  This is the next up the SL line, and it has much more capability to drive my speakers to impressive levels.  And it brings on a much more refined portrayal of space.  A shoot out with the big BAT amps gives the pros and cons of refined detail and finesse of the SL vs. the big bold powerful BAT.  I can only dream to go up another level or two within SL.

So @whatsmyname, yes, I suggest that you do indeed call Klaus at Odyssey?  And why do I say this?  Because he is the SL distributor in the US.  There is a good chance he might have an SL amp for you to audition.  And the SL will give the Pass a serious run for the money, and likely take the checkered flag.