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The Official Mcintosh Labs MX-151 & MX150 Owner's Thread - Page 9

post #241 of 479
Thread Starter 
Calling all 150/151 owners!

If you have Star Trek Into Darkness and/or Super 8 (both Paramount True HD 7.1 mixes), please bitstream them to the 151:

- for STID, listen to the crash of the USS Vengeance into the water near the end.
- for Super 8, listen to the train crash.

Both addino and I have confirmed hard clipping (a snapping/popping set of sounds, regardless of volume level, regardless of RP, regardless of DRC settings) when the 151 decodes. When the player decodes (sends LPCM), there is no hard clipping.

Please report your findings here, and contact McIntosh support to report the issue - (888)-979-3737 ext 311
post #242 of 479
Quote:
Originally Posted by adidino View Post

MX151 is HDMI 1.4. Passes 3D to my VW1000 without issue. A for 4k, Sony's 4k player has dual hdmi output (audio/video split). I'm sure future players will have the same. There will be many options abou there. I wouldn't worry about 4k passthrough on a processor right now.

Quote:
Originally Posted by thrang View Post

For HDMI 2.0, you will eventually need a 2.0 switcher, or something like a future 4k Lumagen processor which also does switching, neither of which exist at the moment.

Its also a question of how many 4k sources you'll have - if it's just one for the foreseeable future, just use the split A/V on the the Sony FMP, sending video to one of the two 1000 upgraded HDMI inputs, and audio only to the 151

Ok great, thanks gents! I do see Sony's 4K server with the dual HDMI outputs (one video, one audio) so at the minimum there's plenty of life left in my MX150!!!


That puts my mind at ease for now.
post #243 of 479
Thread Starter 
Quote:
Originally Posted by scanido View Post


Ok great, thanks gents! I do see Sony's 4K server with the dual HDMI outputs (one video, one audio) so at the minimum there's plenty of life left in my MX150!!!


That puts my mind at ease for now.

If you have STID or Super 8, see my post above
post #244 of 479
I do not have a Mcintosh but have an RS20i.

I didn't notice any issue with STID. But on both my old ada CRM4 and my DataSat I find the audio on super 8 to be just terrible and clips. I just put this down to a poor mix down. Ill have to try it LPCM now to see if it sounds better.
post #245 of 479
Thread Starter 
Quote:
Originally Posted by djnickuk View Post

I do not have a Mcintosh but have an RS20i.

I didn't notice any issue with STID. But on both my old ada CRM4 and my DataSat I find the audio on super 8 to be just terrible and clips. I just put this down to a poor mix down. Ill have to try it LPCM now to see if it sounds better.

So the train crash sequence has pops and snaps similar to what I posed on the ADA and RS20i? But not the water crash sequence in STID?

Thanks
post #246 of 479
Quote:
Originally Posted by thrang View Post

If you have STID or Super 8, see my post above

I watched Super8 not too long ago, but it was downloaded from the Sony Store, which unfortunately does not output the same lossless audio as the bluray. I did not notice any apparent pops with the audio version at the time.

I do plan on getting the new Star Trek on bluray, so I'll let you know if my MX150 exhibits the same issue.
post #247 of 479
I checked STID and couldn't tell for sure if there was an issue with the crash scene. I heard some pops and snapping sounds along with many other crash sounds but I couldn't say that they were not part of the crash. I have Super8 and will check it later. Seems like I remember an issue with the audio in Super8 when I was using the Anthem.
post #248 of 479
Quote:
Originally Posted by KRGM1 View Post

I checked STID and couldn't tell for sure if there was an issue with the crash scene. I heard some pops and snapping sounds along with many other crash sounds but I couldn't say that they were not part of the crash. I have Super8 and will check it later. Seems like I remember an issue with the audio in Super8 when I was using the Anthem.

Try changing the setting on your BD player to LPCM. Listen for those same pops and snapping. You might find you don't hear them...
post #249 of 479
Thread Starter 
Quote:
Originally Posted by KRGM1 View Post

I checked STID and couldn't tell for sure if there was an issue with the crash scene. I heard some pops and snapping sounds along with many other crash sounds but I couldn't say that they were not part of the crash. I have Super8 and will check it later. Seems like I remember an issue with the audio in Super8 when I was using the Anthem.

No, that's the issue - those pops and snaps are not normal

As Addino said, LPCM from the player will cause them to stop

Super 8 train crash is much worse

I'd ask that you call Mcintosh tech support tomorrow if you can to report it - the more they hear from users, to quicker they hopefully will address it
post #250 of 479
Thread Starter 
Quote:
Originally Posted by scanido View Post

I watched Super8 not too long ago, but it was downloaded from the Sony Store, which unfortunately does not output the same lossless audio as the bluray. I did not notice any apparent pops with the audio version at the time.

I do plan on getting the new Star Trek on bluray, so I'll let you know if my MX150 exhibits the same issue.

Yes, the lossy track won't exhibit it
post #251 of 479
It was very easy to hear the clipping during the train crash in Super 8. There was no doubt.
post #252 of 479
Thread Starter 
Quote:
Originally Posted by KRGM1 View Post

It was very easy to hear the clipping during the train crash in Super 8. There was no doubt.

Good! Well, bad...well, you know what I mean....

PLEASE report it to McIntosh technical support...if you need contact info, its posted above, or PM me...
post #253 of 479
Is this happening on other Blu-rays. Seems like I've heard this before(not as bad) and just ignored it.
post #254 of 479
Thread Starter 
I've heard it on STID and Super 8...not sure but it seems to be limited to some (maybe hot) TrueHD 7.1 mixes, and there aren't that many...

If you have examples of other titles, post them and I'll check if I have them. That should not happen, and doesn't on other processors.
post #255 of 479
Definitely doing it on those titles mentioned above. I am currently going through my library looking for more True 7.1 titles for testing.
post #256 of 479
Checking Brave and GI Joe Retaliation right now.
post #257 of 479
Anyone know which DSP chip is used for the core audio decoding? Cirrus, TI, other? If TI, is it one of the MDS boards (e.g. DAE-77)?

Anyone ever take pictures of the DSP boards?
post #258 of 479
Thread Starter 
Quote:
Originally Posted by Roger Dressler View Post

Anyone know which DSP chip is used for the core audio decoding? Cirrus, TI, other? If TI, is it one of the MDS boards (e.g. DAE-77)?

Anyone ever take pictures of the DSP boards?

Hi Roger

This was a bit of the direction I was going in Ralph Potts STID review thread - try and get a collection of everyone's succint and objective feedback, and what processor/receiver they were using to see if there was a pattern of certain brands of chips being used that are having an issue.

Regarding the Mac, I'll see if I can find out...
post #259 of 479
Jack Reacher McIntosh MX151 opening clip-

WARNING: It can be disturbing for some.

http://www.youtube.com/watch?v=m5_rnO9rf2w&feature=youtu.be

I know it is hard to tell from sound recorded from an iPhone and then uploaded to a P0C but you still can still hear details. As good as it does sound of course it is much better live.
Edited by joerod - 9/22/13 at 4:03pm
post #260 of 479
I think I heard clipping again. This was a bitstreamed Vudu rental. The scene was from "Grease" of an old hotrod. When he opened his cutouts my front left and right speakers rattled. I had DPL2 applied to the bitstream. I went back and ran the same scene without DPL2 and all was fine. I then tried PCM and it was fine. I know this is a different situation but it seems like another processing error. The rest of the movie was fine except for when this car opened his cutouts.
post #261 of 479
Quote:
Originally Posted by KRGM1 View Post

I think I heard clipping again. This was a bitstreamed Vudu rental. The scene was from "Grease" of an old hotrod. When he opened his cutouts my front left and right speakers rattled. I had DPL2 applied to the bitstream. I went back and ran the same scene without DPL2 and all was fine. I then tried PCM and it was fine. I know this is a different situation but it seems like another processing error. The rest of the movie was fine except for when this car opened his cutouts.

They key is listening for the clipping bitstream vs LPCM. That usually the give away.

McIntosh is looking into the issue based on the feedback I provided. They also confirmed the clipping in the SWID scenes.
post #262 of 479
Quote:
Originally Posted by adidino View Post

They key is listening for the clipping bitstream vs LPCM. That usually the give away.

I did check LPCM vs Bitstream 5.1 dolby not processed and neither clipped on this scene. The processing error occurred when I processed the signal with the Mac(DPL2).
post #263 of 479
I may have a related issue to this clipping. It occurs when I use my Bell Sattelite receiver when programming momentarily changes to PCM -> Dolby Digital or vice versa when changing channels. I would get this loud pop noise (clipping?) for a brief second as soon as I change a channel. The issue would be intermittent occuring on some channels.

I've had this issue ever since owning my MX150 and raised the issue at the time to Chuck Hinton. He thought it was my Bell Sat receiver, but after going through 2 different ones, the issue may lie in the MX150's firmware which he said he would look into. Fast forward 2yrs and I still got the issue and have resorted to changing my output solely to PCM for fear I may blow out my B&W diamond tweeters. This may be related to to the above clipping concern?
post #264 of 479
Thrang,

If you don't mind me asking, you said you simplified your setup back to 7.1 and haven't looked back it sounds so good. I was wondering as I am so close to clinching my system and testing the MX-151 (as soon as I am finished I will have one brought in to compare against), do you feel an itch in the back of your head because of Aura and other 3D (more than 8 channel processing) solutions are so close on the horizon?

I am really suffering from being stuck on an 8 channel system with advancements coming out with overhead speaker options etc. I would be stuck at 7.1 and am struggling to even identify if it will sound better to use surround rears as my upgraded channels from 5.1, or to use front height speakers with my last 2 channels of DAC. I am coming from 5.1 right now so I have many many options at the moment but there's so much to think about lol.

Maestro2be
post #265 of 479
So what's the highest Room Correction % you guys are getting???
post #266 of 479
Thread Starter 
Quote:
Originally Posted by joerod View Post

So what's the highest Room Correction % you guys are getting???

I think I stopped around 96 or 97 percent
post #267 of 479
Damn, my Room Knowledge is 100% but I can't get Room Correction over 70% no matter how many measurements I do. Currently at 30. Yes, the sound is amazing but it bothers me I can't get to at least 80%. My Focus is there, just not Global...
post #268 of 479
Thread Starter 
Quote:
Originally Posted by joerod View Post

Damn, my Room Knowledge is 100% but I can't get Room Correction over 70% no matter how many measurements I do. Currently at 30. Yes, the sound is amazing but it bothers me I can't get to at least 80%. My Focus is there, just not Global...

You're only concerned with room knowledge 95% or better...

The correction percentage is how much of the signal needs correction - so the lower the number, the better your room's native acoustics are. High number room correction percentage means the room requires a lot of correction because of modes, reflections, etc.

You should not require anywhere near 30 measurements. Generally, 8-12 will get you to mid 90 percent room knowledge.

Adding focus positions is all that's left.

When analyzing your results, look at the bypass values for levels. If anything is cut/gain more than 12 db, something is out of balance (sub too hot or lean typically) and you will not get optimal results.

I think my room correction is 18%
post #269 of 479
So with it being lower I am better off? Excellent. I actually had it in the 40s at one point. I spent a long time (obviously) doing those extra measurements. I am very happy with the results. Thanks for your help.
post #270 of 479
Thread Starter 
Quote:
Originally Posted by joerod View Post

So with it being lower I am better off? Excellent. I actually had it in the 40s at one point. I spent a long time (obviously) doing those extra measurements. I am very happy with the results. Thanks for your help.

You're shooting for 95% of room knowledge, and assuring your bypass gains/cuts are no more than 12 db.

Your room correction percentage is feedback as to how much correction is required. A high number means perhaps your room could stand to use some more traditional treatments (any room eq is secondary to proper speakers positioning, room treatments, etc.)

Performing excessive measurements may skew results, though I don't know precisely... But if you've gone from 40 to 70 percent room correction after hitting 95% room knowledge, something is not right.
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