What makes the Bloom around instruments . . .

Hello,
Frogman that was an excellent description of what`s called bloom. It`s most certainly a function of harmonic overtone/fundamental tones and when captured is utterly beautiful. It makes music sound more realistic,thus less canned and sterile. It is a reflection of a component`s noise floor and ability to retrieve low level detail/resolution. How the Pass amp can do this well yet bury the organ in the musical track as the OP stated seems very strange, as preserving the bloom quaility is the more elusive trait.

I don't have anything by Dire Straits to hear that particular organ with the Pass XA200.5.

But I would say that the organ and choir at the end of Mahler #2 would leave you speechless and sobbing uncontrollably.

I guess that a more specific explaination is in order here. It seems that there's a lot of confusion with what I said or how I said it.

In my system, with my Wadia S7i directly feeding the Pass XA30.5 via $5,000.00 interconnects, then out to my $15,000.00 custom modified speakers and Duelund outboard crossovers via $6,500.00 speaker cables, the Pass XA30.5 was heavily bloated whereas the Spectron Musician III Mk2 was precise.

The XA30.5 had a strong bass and good high frequency extension, BUT, the instrument that was so prominent that it was masking everything else was the drums.

I said that the organ was masked and I couldn't hear it because I play keyboards. I know that the organ is in the song. But the organ was not the only thing missing or covered over by the drums. The quiet guitar parts at the end of the song were also unheard. Everything besides the drums was a lot quieter and covered up due to the drums being so prominent.

The only time that I heard the Bloom is during quiet or non-complex passages. During complex passages the drums were smacking my head against the wall.

Also, I don't listen at very loud volumes. I'm in a 10' x 12.5' room with the speakers 4' from my ears. I have the dip switches on the Wadia set to attenuate the output by -18 db so that I can open up the Wadia's volume to the recommended level without blowing my ears out.

I'm not saying anything against the Pass other than what it was doing in my system in my room.

Chuck

When an audio product can't separate each individual instrument,singer,or other from each other,that would be the opposite of being articulated.When your system and recording is highly articulated,you should be able to identify everything separately,with it's bloom,and other sonic characteristics,as you would,if listening to it live.I still think someone that isn't familiar with the terms used,would be easiest to compare two products,one that has the quality,against one that lacks it,possibly with someone there to point out where the difference is on the recording.Another way would be to have a recording made by an audiophile with a short cut of music(10 seconds?)with it lacking in it(bloom),against the other that reproduces it good.Without Knowing some of these characteristic's,it could be easily confused with some other descriptive term.At least,that's my two cents worth.I didn't see the Stereophile's full list of them,to see how good they did at trying to make it understandable.

Frogman's description of bloom and the sound of real instruments in a real performance is awesome. Great stuff!!! I'd just like to add that these qualities are rarely present in a studio recording. It does not have to be "live" recording but if the recording is built up instrument by instrument in a conventional studio with all its acoustic treatments, its unlikely to be present. IMO, this is one of the ways that most people can immediately distinguish between a live performance and a reproduction, even when heard from some distance away.