Anthem D2/D2v/AVM50/AVM50v/ARC1 tweaking guide - Page 1084

Between this and the MRX thread, I could occupy most of my day. The fact there is an itouch app for the AVS forum means I don't even have to boot up my computer. It's too easy
John

The box in question has a built in amp... I hate re-soldering or re-crimping an RCA connector. That is only slightly more palatable then dropping the amp out of the box which isn't all that accessible.

Oh and for the record I still make up my own Cat-5 cables... granted it takes a pair of 2.5X cheaters and an hour or so but I can still see those colored wires.
And to prove my color code knowledge I still remember "Bad Boys Ravage Only Young Girls But Violet Gives Willingly for Silver or Gold" not PC but it stuck for over 30 yrs.

i remeasured prior to most recent NULL procedure(disconnect all speakers, etc)
but, here are thursdays results.
tomorrow, i do it all again.
(there was NO gain, so i manually applied 2.00)
walt

My guess as to why you got zero room gain is that both your fronts and your sub show a dip at 100-150hz. ARC doesn't think your speakers are capable to have the boost applied. The bottom end measured on your left front is unreal.

Since you have a dip in the Center Channel at the crossover, which is 60 Hz, is my guess why ARC didn't apply room gain. It looks like you have over a 6 db dip at the crossover in the Center Channel. So, if you can try adjusting your center channel such as maybe tilting it up/down towards the listening, or if you have it sitting on a cabinet to make sure you have the front of the center channel more towards the edge of the cabinet to prevent reflections from the cabinet. Also, you have about a 13 db drop at 40 Hz in your sub. So, I suggest you experiment with sub positioning to maybe help fix or mostly fix the dip at 40 Hz. You can use Quick Measure as you are making your adjustments so that you can see the impact as you make your adjustments.

Another thing to look into is room treatments.

AVM 50. I am constantly adjusting the volume when watching movies and it is annoying to see the volume display for a few seconds while watching the movie. If possible, how do I change it. Thanks.

Walt:
Others have commented well on the possible ways to improve your system, I'll add my 2 cents on the subs 40Hz dip.

Please make sure that each subwoofer is optimally placed using "Quick Measure". The Harmon Kardon R&D division wrote a paper on optimal sub placement for 1,2 4 and 16 subs. The summary of it is that 1 sub is not optimal for even bass within the room. 4 subs provide the best configuration with each sub placed along the center of each wall. 2 subs provide 90% and more of the 4 sub best configuration, again with each sub placed on the opposite center wall opposite. And BTW, 16 subs didn't provide that much more of an improvement over the 4 sub configuration. The law of diminishing returns was definately in effect here.

So, if your listening room decor allows it:

1. Place the 2 subs along the center line of each wall facing each other on opposite walls. Make sure that the phase knob is set to 0 on Sub #1 and adjust the knob on Sub #2 for the best combined ferquency response. (Ofcourse, you would have calibrated the sub volumes to 75dB already)
The placement could be front wall-to-back wall orsidewall-to sidewall.


2. If option #1 isn't possible, then place both subs along the same wall facing into the room, then perform the due diligence mentioned in option #1. You have 4 walls, so some experimentation is in order. In my case, my 2 subs are to my right wall near the corners between the left couch and it sounds marvelous to me.

In either configuration, watch for the best frequency response (i.e most even and most extended possible).

So, once either of the above is done, then phase match to the mains as i mentioned in an earlier thread.

You might want to do a quick ARC run using a 2.1 setup and see what the bass/sub response looks like, before you tackle the full 7.1 calibration. But you should be able to get a pretty accurate idea of your combined sub response using the "Quick Measure" tool.

Good luck, you are almost there!

David ...


EDIT:

Found the article on Optimal Subwoofer Placement I was talking about here:
http://www.aes.org/tmpFiles/elib/20110218/13680.pdf. Its quite a read but definately worth it.

In the setup menu there is a choice for turning the OSD off. Can't remember exactly where but it's there. Check your manual.
John

AVM 50. I am constantly adjusting the volume when watching movies and it is annoying to see the volume display for a few seconds while watching the movie. If possible, how do I change it. Thanks.

If your a new owner try adjusting or turning off Dolby Volume,,

dmusoke;20029216]Walt

[/color]
Prior to my response(s), my appreciation to all who offered suggestions: all are welcomed and will be acted on, 'tomorrow'(refer to final note)


I have two 15" subs, good to 20 hz, located where a professionally developed program said they should be. That said, in those locations, i have a very large room mode at 25% of the distance from the front wall.

So, if your listening room decor allows it:

1.

I have had my subs in the opposing wall positions, which helped with the mode problem, but then i lost the punch i expected from the subs, the punch that i did not lose in the recommended position.(it is difficult, if not impossible, to balance the sound over an eight chair theater)



will not work for me, as i have super chunks in the rear corners.



My approach has been to use a sound generator to determine the most even bass response in the listening part of the room. I do this by moving from chair to chair and listening for the most even sound, from 40 hz to 100 hz. This has seemed to work, but the room mode mentioned elsewhere (it'll knock out the fillings from the teeth) remains. Still, if one refrains from standing up in the front of the theater, the mode is not an issue.


I failed to mention "THE ROOM". It is 16'+ X 23' X 9.5' with eight leather recliners, the rear four on an eight inch 'balcony'. My mains are capable(and audible) to 30hz, the center and surrounds good at 40hz.(all revel ultima salon 'two' speakers. So, there are more clashing lfe effects bouncing around than from just the subs.



My plan was to do this today - however, the other half has decreed that the leaves shall be gone: today. Perhaps, tomorrow.

Good luck, you are almost there!
re: the link. Thanks! I skimmed it: At 70, the math evades me, but the concepts are understood. Thanks . Walt
David ...


EDIT:

Found the article on Optimal Subwoofer Placement I was talking about here:
http://www.aes.org/tmpFiles/elib/20110218/13680.pdf. Its quite a read but definately worth it.[/quote]

I don't think the AVM50 has Dolby Volume.
John

There is Dolby volume on the avm 50

I believe that Dolby Volume exists on the AVM-50v, not on the AVM-50...

I looked in the avm50 manual and there is no reference to it.
John

[/quote]

Walt:

The only other thing I can think of then is to use bass traps in the corners of your rooom. They are extremely useful and effective in taming troublesome room modes. Companies such as RealTraps, GSK and ReadyAcoutics make some highly effective traps which are home-decor friendly and have high WAF with the spouse. IMO, its imperative for anyone serious about HT to have traps installed in their listening room (unless ofcourse, if you have a room that is scientifically designed to have no resonance modes at all. It might sound great but will look really really ugly).

I would also recommend high frequency traps on your side walls to absorb wall reflections that when combined with the incident waves from the front mains, mess with the sound imaging in your room. They will also even out the frequency response as well.

Walt:

The only other thing I can think of then is to use bass traps in the corners of your rooom. They are extremely useful and effective in taming troublesome room modes. Companies such as RealTraps, GSK and ReadyAcoutics make some highly effective traps which are home-decor friendly and have high WAF with the spouse. IMO, its imperative for anyone serious about HT to have traps installed in their listening room (unless ofcourse, if you have a room that is scientifically designed to have no resonance modes at all. It might sound great but will look really really ugly).

I would also recommend high frequency traps on your side walls to absorb wall reflections that when combined with the incident waves from the front mains, mess with the sound imaging in your room. They will also even out the frequency response as well.[/quote]
david: if anything, i may be over damped! There are the superchunks in the rear corners, the front angled walls(3' X 9') are floor to ceiling covered with 3.5" of 701, the front wall on either side of the screen has the same treatment, and i just introduced( as an experiment) pink stuff under the screen.(12" X 10').
[clarification: the front of the theater has angled walls, not 90 degree corners as is typical in most rooms. The angled walls are 40" wide X 9' high, each wall]
it was post the pink stuff that the gain dropped to zero.
(AHA moment for me??)
the first reflection points have 4' X 6' X 3.5" rigid, and there are diffusion items on the rear side walls( GSK units : their recommendation)
So, sunday i'll work on the room again, incorporating recent knowledge - and, perhaps removal of the pink stuff, though from what i've read, this should be "A good thing".
As always,
my appreciation
walt

What will Dolby volume do? Does it keep the volume the same?

basically yes.

Sorry J I forgot to mention that all important v

As suggested earlier, turn off Dolby Volume for all sources and then turn it on for TV if you think it will be helpful. Most don't use it for movies or music.
John

Well Jayray,

It cost me large but I am getting there. I purchased a Paradigm Sub 2 to try and get a graph like yours.
Paradigm says your cut is in the mail. Still some tweaking to do but this thing is extremely hard to move.

John

Looks good. Welcome to the club. Could you post one after you do the calculation?

John,
Your graph looks fantastic and I humbly acknowledge your entrance into the Jayray Sub Hall of Fame And as a fellow Canuck it seems to be lonely here so here's hoping some of our US buddies soon join the club and I know some are very close
John

Sorry Ninja12, forgot to induct you officially too Based on his measure I bet I can predict exactly what it will look like. What I won't know is how it sounds
John

I'm from the US. I will have to post my sub chart when I get home to see if I meet the qualifications for Jayray Sub Hall of Fame.

Thank you. I'm glad to be a member.

Hey !! Can I join the club too?

If you haven't already set, in the advanced menu of ARC, sub high pass order to FLAT, try it out and post another pic of your sub chart. Seems your sub is dropping off at 20 Hz which could be fixed by setting to Flat. Otherwise it is a stellar looking chart and great red measured curve. What sub do you have?
John

Hey Guys,

For giggles check out the response of my old Paradigm Servo 15 in my living room upstairs and let me know what you think. I kind of like the HUGE peak I have at 30 Hz and I don't really want to correct it!! You can really feel that bass, it makes the air shudder!

Yikes, that is huge. To say you're getting something other than the original sound track is an understatement so don't get used to it, it needs fixing
John