Google Search  |  Meridian Systems  |  Meridian Streaming  |  Restaurant  |  WiKi  |  Duncan's Meridian Info  |  Board Rules  |  Restaurant Rules
Page 1 of 2 1 2 >
Topic Options
Rate This Topic
#264212 - 2017-05-13 17:36 MQA Pseudo Trifield Achieved
GMT Offline
Pan-dimensional being

Registered: 2004-10-20
Posts: 1240
Loc: Cambridge, Cambs, UK
I connected my new 218 up quickly last night, I haven't got working comms yet. As far as I can tell, whatever is selected on the input plays on all outputs of the 218.

I also switched the coax, from the back of my Squeezebox, to the coax out on the 218.

By selecting Squeezebox on the G68 I had MQA going out via SpeakerLink to L & R 5200SEs from the 218 and MQA lite going to the G68 / Sbox / Trifield.

It did not just snap in! cry

Cheers
Tom
_________________________
Main: G68J, HD621, 3*5200s (2 SE L&R), 2* Reviver, 3200s, MS200, SBT, PS4, Amazon TV Fire, Dune Base 3.0, Velodyne CT120 (films only)
Kitchen: 561M, M33s, M1500, SBT, Chromecast
Office: A330i, G41, Explorer2
F80s, M60s

Top
#264225 - 2017-05-14 09:29 Re: MQA Pseudo Trifield Achieved [Re: GMT]
bxd Offline
Hitchhiker

Registered: 2011-01-25
Posts: 352
Loc: Southampton, UK
Originally Posted By GMT
I also used the coax, from the back of my Squeezebox, in the coax out on the 218.

By selecting Squeezebox on the G68 I had MQA going out via SpeakerLink to L & R 5200SEs from the 218 and MQA lite going to the G68 / Sbox / Trifield.
Hi Tom,

Can you explain a bit more please. I'm not familiar with the Squeezebox, but I presume that it has a coax input and that you've connected the digital output from the 218 to the Squeezebox (or have you just bypassed the Squeezebox and connected the 218 directly to the G68).

What is the source for the MQA material?

Do the speakers show MQA?

When playing material through the squeezebox (218digital > Sbox > G68 > Trifield), I presume that the G68J is connected directly to the speaker (G68J Digital out > Speaker Digital in)?

Thanks
Brian
_________________________
Main: G65, MD600, MS600, 598DP, HD621, DSP5200SE, DSP5200HCSE, M6 & D1500.
System 2: G91A, MS200, DSP5000 (96/24v1), DSP3300.

Top
#264228 - 2017-05-14 11:59 Re: MQA Pseudo Trifield Achieved [Re: bxd]
GMT Offline
Pan-dimensional being

Registered: 2004-10-20
Posts: 1240
Loc: Cambridge, Cambs, UK
Hi Brian

Firstly, this isn't true Trifield as we know it. It is in fact unproccesed left and right speaker with processed centre. I imagine that true Trifield has subtle changes to the left and right speaker.

The unabridged version:
Assumption: Comms must be disabled

Roon MQA - Network in - Feeds Left and Right Speaker MQA

Coax out on 218 to G68 Coax in (In my case what was previously configured for Squeexebox use) - Feeds centre speaker MQA lite

On 218 - Use Roon
On G68 - Select Squeezebox/Trifield

Cheers
Tom
_________________________
Main: G68J, HD621, 3*5200s (2 SE L&R), 2* Reviver, 3200s, MS200, SBT, PS4, Amazon TV Fire, Dune Base 3.0, Velodyne CT120 (films only)
Kitchen: 561M, M33s, M1500, SBT, Chromecast
Office: A330i, G41, Explorer2
F80s, M60s

Top
#264230 - 2017-05-14 12:35 Re: MQA Pseudo Trifield Achieved [Re: GMT]
Ian Offline
President of the Imperial Galactic Government

Registered: 2004-08-07
Posts: 7218
Loc: Surrey, England, UK
That really sounds like Trifield Width is broken

[edit]
A reference to the long running 'trifield width is broken' bug that existed a number of years back. The bug meant that Trifield width setting was non functional.

The tenuous link is that this is not the Trifield DSP mode (looks to be raw MQA/stereo from 218 plus a daisychained processed centre from processor) and thus there will be no width setting as it is 'stereo'.

Quote:
I had MQA going out via SpeakerLink to L & R 5200SEs from the 218 and MQA lite going to the G68 / Sbox / Trifield.


The Trifield width setting is important as many people use this to 'snap' the Trifield sound stage into place. Thus, Trifield width is non existent (aka broken) in this configuration.

Apologies for the cryptic comment.
[\edit]


Edited by Ian (2017-05-15 10:11)
Edit Reason: Explanation and links to Trifield Width Broken threads
_________________________
Meridian owner since 1992
DSP5000 96/24, MC200, Prime & PSU, Focal Elear, Explorer 1 & 2, F80, 200/203 and various Sonos.

Top
#264232 - 2017-05-14 13:14 Re: MQA Pseudo Trifield Achieved [Re: GMT]
bxd Offline
Hitchhiker

Registered: 2011-01-25
Posts: 352
Loc: Southampton, UK
Hi,

I can't see why you can't do proper Trifield.
If you have the G68 speaker outputs wired to the coax digital inputs on the DSP speakers (L+R and C+Sub) then you can use the digital input from the 218 as a regular (digital) stereo (pcm) source and simply apply any of the regular processing associated with the processor. ...or am I missing something?

I don't know how comms would work with the 218 connected. If you already have comms going to the speakers from the G68, won't it be carried on the SpeakerLink connection to the 218.

Edit: Just noticed your other post about comms.

Not sure what Ian meant by his comment.

Brian


Edited by bxd (2017-05-14 13:49)
Edit Reason: update
_________________________
Main: G65, MD600, MS600, 598DP, HD621, DSP5200SE, DSP5200HCSE, M6 & D1500.
System 2: G91A, MS200, DSP5000 (96/24v1), DSP3300.

Top
#264234 - 2017-05-14 15:27 Re: MQA Pseudo Trifield Achieved [Re: bxd]
GMT Offline
Pan-dimensional being

Registered: 2004-10-20
Posts: 1240
Loc: Cambridge, Cambs, UK
I can do proper Trifield with 218 and MQA lite (or at least I should be able to).

The funny thing that I was reporting that I had full fat MQA from the L & R speakers + MQA lite via the centre.

Proper Trifield does not support MQA.

Cheers
Tom
_________________________
Main: G68J, HD621, 3*5200s (2 SE L&R), 2* Reviver, 3200s, MS200, SBT, PS4, Amazon TV Fire, Dune Base 3.0, Velodyne CT120 (films only)
Kitchen: 561M, M33s, M1500, SBT, Chromecast
Office: A330i, G41, Explorer2
F80s, M60s

Top
#264246 - 2017-05-14 18:33 Re: MQA Pseudo Trifield Achieved [Re: GMT]
bxd Offline
Hitchhiker

Registered: 2011-01-25
Posts: 352
Loc: Southampton, UK
Hi Tom,

I think we need to be a little bit careful about using terms like MQA 'lite'. As far as I'm aware, the input to the G68 is simply treated as a regular PCM signal and any MQA 'content' is lost.

I agree, that Trifield doesn't "support" 'full fat'* MQA (so it should only be L+R stereo) but I'm still a little confused by what you're reporting. Are you suggesting that while the L and R speakers are showing MQA, the centre speaker is active. If that's what you have, then I'd suggest that something isn't quite right somewhere. If you have the speakers (digital inputs i.e. not SpeakerLink) connected to the G68, then you should just have regular Trifield from the processor.

*I understand people using the term "full fat" MQA to refer to a situation where the speaker indicates that it is receving a MQA signal, but I think it's going a bit too far to refer to MQA lite. If anything, I'd think of it as MQA skimmed, where the original signal had MQA content but it's been removed by the processor to leave basic PCM. Obviously, some people prefer 'skimmed' milk and it may well be that some people may like 'skimmed' MQA when compared to regular PCM.

I don't want to go any further with the "dairy" analogy, so I think I'll shut up.

Brian
_________________________
Main: G65, MD600, MS600, 598DP, HD621, DSP5200SE, DSP5200HCSE, M6 & D1500.
System 2: G91A, MS200, DSP5000 (96/24v1), DSP3300.

Top
#264247 - 2017-05-14 18:44 Re: MQA Pseudo Trifield Achieved [Re: bxd]
GMT Offline
Pan-dimensional being

Registered: 2004-10-20
Posts: 1240
Loc: Cambridge, Cambs, UK
Brian

I think you've pretty much milked the analogy dry!

You are correct that something is not right. The 218 is driving the L & R channels via SpeakerLink and the G68 should be set to the same source. Because the comms is not working I can play any of the other sources through the G68 at the moment. That could be a combination of Roon and the TV, Roon and DVD, Roon and Squeezebox.

Cheers
Tom
_________________________
Main: G68J, HD621, 3*5200s (2 SE L&R), 2* Reviver, 3200s, MS200, SBT, PS4, Amazon TV Fire, Dune Base 3.0, Velodyne CT120 (films only)
Kitchen: 561M, M33s, M1500, SBT, Chromecast
Office: A330i, G41, Explorer2
F80s, M60s

Top
#264254 - 2017-05-14 22:20 Re: MQA Pseudo Trifield Achieved [Re: Ian]
dpstjp Offline
Vogon Civil Servant

Registered: 2006-11-08
Posts: 3913
Loc: London, England
Originally Posted By Ian
That really sounds like Trifield Width is broken
Never heard that before.
_________________________
Sooloos, Roon, G series (with LPS upgrade), 800 series (with LPS upgrade), HD621, AC200, Prime and PS, DSPs old and new.

Purdeys, Moke, Leica, 'Blad. Only the best.

Top
#264257 - 2017-05-15 08:21 Re: MQA Pseudo Trifield Achieved [Re: dpstjp]
Ian Offline
President of the Imperial Galactic Government

Registered: 2004-08-07
Posts: 7218
Loc: Surrey, England, UK
I have clarified my existing post.
_________________________
Meridian owner since 1992
DSP5000 96/24, MC200, Prime & PSU, Focal Elear, Explorer 1 & 2, F80, 200/203 and various Sonos.

Top
#264258 - 2017-05-15 08:21 Re: MQA Pseudo Trifield Achieved [Re: bxd]
Ludwig Offline
President of the Imperial Galactic Government

Registered: 2009-09-13
Posts: 5421
Loc: Europe
Originally Posted By bxd
I think we need to be a little bit careful about using terms like MQA 'lite'. As far as I'm aware, the input to the G68 is simply treated as a regular PCM signal and any MQA 'content' is lost.

That's not really accurate.

Playing MQA through MS200-G68, you get 44k signal into the G68: any MQA "content" is lost.
Playing MQA through 218-G68, you get 96k signal into the G68: some benefit from MQA content is retained. = MQA Skimmed. ("skimmed" not "lite"...)

Yes the 96k PCM signal is no longer encoded as MQA, but it contains a whole 2x of extra information from the MQA layer, which is not to be sniffed at.

(And no, Trifield width was never broken.)
_________________________
Ex-moderator
Sitting room: 818v3, 8kSE
Office: 818v3, Stax SRM-T1, Stax SR404LE
TV room: HD621, 518, D33
Kitchen: MS200, Genelec 6010 actives
Server: Roon/NUC/Touchscreen

Oldest audio file: 1889 Edison cylinder

Top
#264259 - 2017-05-15 08:48 Re: MQA Pseudo Trifield Achieved [Re: Ludwig]
ncpl Offline

President of the Imperial Galactic Government

Registered: 2002-02-14
Posts: 8335
Loc: Surrey, UK
Originally Posted By Ludwig


Yes the 96k PCM signal is no longer encoded as MQA


Not sure this is right. The 96k first unfold from the 218 into a G68 would still be encoded with MQA (if there is any).

Otherwise how would a DSP SE do the final render if that was connected to the 218 instead ?

The G68 doesn't do any final MQA render is probably a more accurate statement.
_________________________
Rgds,
Nick

#15SE

Top
Page 1 of 2 1 2 >

Moderator:  Carl, Duncs, ncpl 
Who's Online
10 registered (ExpoFan, Mac147, gzdad888, JohnMcElfresh, AudioImages - Rick, Gianni), 36 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Newest Members
Gaffer, Cybrid, DaveB, Harry, LVdisc
4461 Registered Users
Top Posters (30 Days)
GMT 66
JobSeeker 46
Toony 44
Hector 43
ChrisLayerUK 43
Top Posters
VirusKiller 12326
Fiddler 8619
ncpl 8335
Carl 7468
Ian 7218
Forum Stats
4,461 Registered Members
17 Forums
24,242 Topics
246,289 Posts

Most users ever online: 211 @ 2015-05-05 15:40

Meridian  |  Media Centre  |  Support  |  Firmware Release Notes  |  RSS Systems  |  RSS Streaming  |  RSS Restaurant