|Click title to read one, or click date to read all below it.|
Agreed marc777, seems like some are trying to find reasons ... Setonaudio
Setonaudio, please put a disclaimer on you postings. Onhwy61
I totally agree with onhwy61. let me add that there seems to ... Hifigeek1
Onlywy61... i have made it known...a few times. like i sta ... Setonaudio
Now i am rolling in the floor with laughter. you guys must b ... Marc777
I'm sure there are plenty of units on back order since they ... Kclone
Marc777/setonaudio you guys seem to be blinded by the " ... Milpai
I've been running thru various audio sites/forum boards disc ... Spiritofmusic
Milpai, why too much? if one feels strongly about somethin ... Setonaudio
douglas_schroeder - having read several reviews and commen ... Jazzerdave
Setonaudio, are there other products you sell that rate an e ... Onhwy61
Jazzerdave, if the qol technology were implemented inside an ... Douglas_schroeder
Onhwy61, i have not run across another product that has wow ... Setonaudio
This topic has generated quite the buzz. i've read and skim ... Hawk28
Setonaudio, what is in your personal system besides the qol? Peterayer
Hawk28, have a read of the bsgt.com website for additional ... Setonaudio
Interesting. i was playing around with different locations w ... Ozzy
I’ve just read through this thread with considerable interest. I have not heard the QOL, but from what I can tell from this thread and from the information on the BSG website, QOL is designed to accomplish something very similar to Trifield, the signal processing developed by Geoffrey Barton and Michael Gerzon.
Although Trifield involves three channels rather than two, both Trifield and QOL manipulate the perception of the soundstage in two fundamentally similar ways...
1. WIDTH. The manipulation of “Width” expands the soundstage on the x axis. Trifield manipulates the perception of Width by calculating the sum and the difference of the L and R inputs, then amplifying one or the other. You can see a schematic of a typical Trifield circuit here. The Width parameter in the Trifield circuit is similar to the Mid/Side parameter described in the article that Onhwy61 mentioned, which says…
The M/S approach essentially considers it as being comprised of central and side elements. The Mid signal is the mono sum of both left and right, and basically describes those elements present in both channels. The Side signal is the difference between the two channels, and describes those elements that contribute to the stereo width… It follows from this that the balance between the Mid and Side signals determines stereo width.
Even though Trifield involves a third channel, the same basic principle determines the perception of Width.
2. DEPTH. The manipulation of “Depth” expands the soundstage on the z axis. Trifield manipulates the perception of “Depth” by adding group delay to one or more channels. Again, Trifield employs three channels whereas QOL employs two, but a similar principle seems to be involved.
Together, the manipulation of Width and Depth can create a very spacious soundstage, far more spacious than the speakers and the room would seem to permit. I know this from personal experience, as I have listened to Trifield extensively on my Meridian G68. In fact, I’ve been listening almost exclusively to Trifield for the past few months.
Meridian’s implementation of Trifield allows the user to set the values of Width and Depth, so he can tailor the soundstage to his particular room and taste. For my own taste, a small amount Width and Depth manipulation yields the best results.
The BSG website doesn’t reveal a lot of design details, except in a very abstract way. In his interview with RH, QOL's inventor Barry Stephen Goldfarb says this...
Essentially the idea was to get out of a single signal both the in-phase information and the out-of-phase information… I began to try to figure out a way of tricking the signal so that part of it would play and another part might be cancelled. I then tried layering different frequency paths. Let’s say I took a limited frequency band up to, say, 3kHz. I’d let that play. Then I would take another band-limited signal from 3kHz to 6kHz and put it in the opposite phase. Now they’re playing together. They’re not interfering because the two are not really playing the same frequency simultaneously, If you keep doing that with other frequency bands, it’s like weaving frequencies. A group of frequencies will be in-phase to a limited bandwidth; another group of a different bandwidth will be out-of-phase; and I would add these layers until the entire audio bandwidth from 20Hz to 20kHz was covered. That technique produces a whole audio signal… We call it in our patent “Phase Layering.”
The band-limited manipulation of phase is also found in Meridian's Trifield. Meridian's implementation of Trifield is digital, whereas QOL is analog, but again a similar principle seems to be involved.
None of these comments are intended to diminish the value of QOL. My own personal experiences with Trifield have led me to conclude that soundstage manipulation, when executed well, can yield very pleasing results. Judging from the owners who have contributed to this thread, it sounds like QOL’s execution is excellent.
I agree with the observation that the desirability of soundstage manipulation is, to a significant extent, recording specific. It is for that reason that, IMO, a little goes a long way.
Bryoncunningham (System | Reviews | Threads | Answers | This Thread)
I have had a qol in my system for about a month (speakers ar ... Gcsakakini
Gcsakakini, glad you like the qol. i have had mine for over ... Ozzy
I have been listening to the qol for a week in my system. fo ... Mihalis
Correction: i was not suggesting that the quality of the ele ... Mihalis
Mihalis, thanks for the informative review.based on your opi ... Aolmrd1241
Mihalis, it's a good thing you can send it back. you would h ... Ozzy
Ozzy, i want to make sure that your passionate support of th ... Mihalis
Mihalis, so are you keeping the qol? Ozzy
Mihalis, great review...the thread appreciates your pennies ... Setonaudio
Ozzy, i am curious although not ready to insert it full time ... Mihalis
Ozzy wrote: "they used 7 different unfamiliar systems t ... Oddiophool
Same message i left on the tech talk section. oddiophool, t ... Ozzy
Another huge plus for the qol is you can go out and get an i ... Kclone
I have had the qol device in my system for over two weeks an ... Teajay
What is scs or what does scs stand for? Kclone
Teajay, "minor changes", wow! have you had your he ... Ozzy
Ozzy, i have not moved my speakers since i got my qol, but i ... Gcsakakini
Hi ozzy, the two speakers i have been reviewing the scd wit ... Teajay
Hi guys. i must also express surprise teajay that you report ... Mihalis
Mihalis, i see you have some interconnects that cost more th ... Ozzy
Haven't heard it, but i bet it's just like what mihalis desc ... Shakeydeal
No real helpful info. on my part(just like shakeydeal!) howe ... Marqmike
Hey ozzy, the qol required me to add one valhalla xlr. howev ... Mihalis
My question is directed to those who claim to have some idea ... Psag
It is not a distortion device, it is a signal processor. t ... Onhwy61
It is neither a distortion device nor a processor. it's &qu ... Larryakay
If the qol solves these inherent problems with the signal, r ... Peterayer
03-31-12: larryakay it is neither a distortion device nor ... Bryoncunningham
not for anything but why does this matter ? whatever it is ... Pipedream
my post was motivated by nothing more than curiosity. i am n ... Bryoncunningham
To date, exactly 3 of more than 120 sold have come back. th ... Larryakay