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In Reply to: RE: Looking for inmate opinions about multichannel posted by Doktor Brahms on September 21, 2016 at 10:09:33
I love hearing multi-channel if it doesn't affect 2-ch playback.
Unfortunately it means having to remove all participating m-ch equipments (both speakers and electronics in excess of the stereo system) out of the room when listening to just 2-ch system.
Any unused speakers in close proximity to the front 2 speakers can affect their soundstaging projection.
Don't ask me the theory behind this.
Simply do a test - put a single speaker nearby. You might try just a 8" woofer driver instead of the whole box if you wish not to have issue with additional reflections.
Try listening with the speaker driver's inputs open(1) and shorted(2), with its inputs connected to another amplifier but the amp being switched off(3) with and with the driver (and the second amp) removed from the room(4)
The choice of player is important:
Always remove the disc and refresh the player before playing the test track (best is if the test track is the first track)
For an oppo based transport/player, make sure the auto play mode is deactivated.
Always ensure the disc is removed before powering down and powering up again.
Do not use the remote.
After powering up, let the transport/player fully settle before opening the tray and inserting the disc. Then close the tray using the front panel buttons.
Do not use the remote.
Let the transport/player read the top and settle.
Then press play button on the front panel to play track one
Do not use remote. Everytime infrared signals is received at the destination sensor, it can disrupt the transport/player's power supply momentarily, leading to audible interference to the soundstaging projection.
Using this method to play a disc on an oppo will provide opened and spacious soundstaging.
But it will only sound like this for the first track.
Subsequent tracks will not sound like this.
That is the main reason why I do not recommend using oppo based transports/players.
Follow Ups:
There is no magnetic interference by additional Mch speakers that affects stereo playback. It is a myth with no proof either theoretical or empirical. There is insufficient stray magnetism from most speakers in a Mch setup, given the distance separating them. Mch speakers should never be "in close proximity" to the main front channels used for stereo.
Decades ago, Ivor Tiefenbrunn of Linn theorized that unused, additional speakers in the room affected playback, as in showrooms. But, that was based on the unused speaker drivers absorbing acoustic energy in the room via induced movement of their drivers, not magnetic interference. However, if the unused speakers are shunted - shorted across + and - terminals - the speaker drivers cannot move and they cannot absorb acoustic energy via driver movement any more than any other object in the room. It is elementary physics. Sure, any objects in the room might possibly affect room acoustics somewhat, whether they be unused speakers or ironing boards or potted plants. Careful about that watch on your wrist or the clothes you wear when listening. They might affect room acoustics, too.
If it is a concern though, connecting unused speakers to an amp in most cases accomplishes the same electrical shunt, though that may require that the amp be powered on even if delivering no signal.
Magnetic interference by stray magnetism from speakers caused a video issue only with old CRT displays because the sensitive CRT raster scan was magnetically controlled, But, that was true only if the speakers were magnetically unshielded and if they were placed in very close proximity to the CRT, as in right next to it. Usually, a foot or two of separation eliminated the problem. Modern video displays have no such problem.
So, this whole thing is like chasing unicorns. Stereo playback is perfectly fine even with Mch equipment in the same room.
Of course most people who have multi channel systems usually have a tv in the room which can effect sound. Cover the tv with a blanket to avoid this problem I have multi channel in a seperate room from my 2 channel system. I listen to a lot of classical music and do not like multichannel. The proble partly is because most mch disks (SACD) have not been done very well. It can be fun but not very realistic. If home theater did not exist mch would be a dead issue. Synthesized mch can again be fun but not very realistic sounding. Spend the money on improving your 2 channel system
Alan
I made the point in another post. But, classical music recording natively done in hi rez discrete Mch and intended for hi rez Mch media differs greatly from other genres. Many non-classical Mch releases are remastered, repanned engineering creations from analog or RBCD rez studio originals. In general, they lack a realistic sense of spatial accuracy, since that is not a priority in studio recordings, starting with mike and performer positioning. I am sure there are individual exceptions, including some jazz and rock or pop done in a live club setting.
Note that I am not snobbishly putting down anyone's music genre preferences. I am just describing typical engineering approaches.
These are among the reasons that classical albums hugely outnumber non-classical in Mch. I find classical Mch typically quite high in sound quality. To me, it is greatly preferable to stereo, and I prefer to use no artificial Mch enhancement schemes. Also, as I said before, I doubt that I would be much interested in Mch if my primary interest were not classical music.
Agreed, Mch music would be dead if it were not for HT. Fortunately, Mch HT is a large, successful commercial business that has also helped enable the move toward hi rez audio. It is not going away.
I personally only got into hi rez and Mch about 9 years ago with the advent of universal players capable of BD and SACD playback together with HT processors - AVRs and prepros - that supported those formats in hirez for both music and video.
However, today I have no HT-specific equipment in my system. I simply have a PC feeding a Mch DAC as well as my TV monitor, together with library/ player software on the PC. I also have thousands of classical Mch recordings in my library from which to choose.
Curious -- what DAC are you using?
There are many poor CD,s but far less poor SACDs A well recorded CD can sound almost as good as a well recorded SACD. However a well recorded mch SACD beats a well recorded CD any time. To put a blanket over the TV is total nonsense.I listen to mainly well recorded Classical. The Penguin Guide to 1000 Finest Classical Recordings states SACD has brought more realism. The back speakers can be very small,even hidden,for their purpose is only to add a subtle ambience to the recording. With small groups of artists this can bring a a subtle but tangible feeling of presence, with large-scale works, especially choral music, the result can be a very thrilling fourth dimension, and one really has the sense of sitting in the Concert Hall itself.
Edits: 09/27/16
a large, hard, reflective surface between the speakers.
Not between speakers BEHIND the speakers, Makes not the slightest difference in my room. best put blanket or carpet on rear wall.
My mch setup in no way affects my 2 -ch playback. I much prefer Sony to OPPO for both SQ & picture.
Edits: 09/24/16
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