Official JTR speaker thread - Page 834 - AVS Forum
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post #24991 of 25005 Old Yesterday, 08:10 AM
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Originally Posted by Reefdvr27 View Post
My 215's were maxed out when I ran them for the first time. I just adjust the attenuators on the Inuke and worked at it and finally got it to 75db with trims at 0.
Nice, so an inuke pro audio amp has gain control from what I saw. I looked up an inuke 6000 that was pretty reasonable and would have more power for my front three than I would ever use. Another good option. Thanks for the input.
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post #24992 of 25005 Old Yesterday, 08:14 AM
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Originally Posted by N8DOGG View Post
You only really have 2 choices, attenuators or just adjust your trims higher on all you speakers. It doesn't mess with the audyssey EQ as it has internal 18dB adjustment, only 12dB is user adjustable. The only thing it changes is your reference level, which you just find on test tones with a dB meter.
Oh nice. If the attenuators don't work just bump the levels of the rest to match the lcr's. Almost too easy. Thanks.
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post #24993 of 25005 Old Yesterday, 08:20 AM
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Originally Posted by Baron5 View Post
Has anyone else had problems with -12 trim levels with the JTR LCR? What was your solution?


Just as a recap I hooked the JTR's up to my old yet highly effective (until now) Emotiva LPA-1 and there was considerable hum that I could hear even while watching TV/bluray. So, I plugged the JRT's only into the 4311 and the hum was gone but after re-running audyssy the trim was still-12.

I ordered attenuators as someone suggested and those should be here by this weekend but I'm a little skeptical that will be the solution since I have to use the attenuators with my preouts on my 4311 and go back to the amp that was causing the hum.
All of my JTR's had this issue and I bought attenuators in an attempt to resolve and they but it was unnecessary. Just set you levels on the 4311 to 80db at the LP and know that ref is -5db instead of 0. You don't need new amps or attenuators and this is coming from someone who has been down that rabbit hole.

Did you try a cheater plug on the amp power cord to get rid of the hum?

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post #24994 of 25005 Old Yesterday, 08:25 AM
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Damn. Just spent 90 on attenuators too. Hopefully parts express doesn't charge a 20% restocking fee.

No, everything was fine when I moved the JTR's to the 4311 amps so there was no need. The volume was the problem and now it sounds like that can be resolved easily as well. Just have to get batteries for my rating Shack spl meter.
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post #24995 of 25005 Old Yesterday, 08:25 AM
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Quote:
Originally Posted by Baron5 View Post
Nice, so an inuke pro audio amp has gain control from what I saw. I looked up an inuke 6000 that was pretty reasonable and would have more power for my front three than I would ever use. Another good option. Thanks for the input.
It's a good little amp. I am using it for the DSP on my 215's which has worked out great. Carp turned us on to it. My only complaint is that it is a bit noisy, gotta fan mod it if it is in the same room.
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post #24996 of 25005 Old Yesterday, 09:24 AM
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Originally Posted by RMK! View Post
I think you have made a great choice in the M2's considering your focus on music. I was even thinking of just a pair in a music only system for a seldom used space in the house but I'm sure they would get little if any use. Just too busy with other things and my preference is really time in the HT room with big audio and video.

What are you getting for center and surrounds? I thought the little 3 series with the same waveguide design as the M2 would sound great for surround duty especially when you consider the price but I think for a cohesive front end, only another M2 would do it for center channel duty.

BTW, I have the 7702 coming and will be interested in your take.
Several options for surrounds. At this time I'm waiting for the JBL LSR708i for side surrounds http://www.jblpro.com/www/products/r...i#.VFJkCPnF81w


Or the JBL 9320 for side surrounds http://www.jblpro.com/www/products/c...d-systems/9320


For ceilings I'll likely go with JBL SCS8's as they're aimable http://www.jblpro.com/www/products/c...speakers/scs-8


or the JBL LSR705i http://www.jblpro.com/www/products/r...i#.VFJkifnF81w


I've started to post on the 7702 over on that thread.
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post #24997 of 25005 Old Yesterday, 11:17 AM
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Originally Posted by Gooddoc View Post
Several options for surrounds. At this time I'm waiting for the JBL LSR708i for side surrounds http://www.jblpro.com/www/products/r...i#.VFJkCPnF81w


Or the JBL 9320 for side surrounds http://www.jblpro.com/www/products/c...d-systems/9320


For ceilings I'll likely go with JBL SCS8's as they're aimable http://www.jblpro.com/www/products/c...speakers/scs-8


or the JBL LSR705i http://www.jblpro.com/www/products/r...i#.VFJkifnF81w


I've started to post on the 7702 over on that thread.
And the Center Channel is what? ... Phantom

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post #24998 of 25005 Old Yesterday, 11:28 AM
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Originally Posted by RMK! View Post
And the Center Channel is what? ... Phantom
Oh, so far, yes. I know you experienced a loss of the center image in the demos, but that has not been my experience at home, or at the demo I had. They do need to be positioned properly to get a wide sweetspot, but my whole listening area works in phantom mode spectacularly well.

Not that I wouldn't want a third for the center channel, but doing so creates more compromise than the phantom center in my situation for a couple of reasons. First, I would have to raise my primary display panel ridiculously high on the wall to clear the center M2. I really don't want to do that. Second, I really want to get a PJ screen that has some decent ambient light rejection capability since it is a living room, not a dedicated theater with perfect light control. Having the center channel makes an AT screen mandatory and light control a problem. Using a phantom center I can get an appropriate screen.

I've been waiting for my new processor to get the system fully up and running again so I can fully evaluate if i'll be happy enough with the phantom, so I've been holding off on the screen purchase for that. If it's unacceptable I'll do what's necessary to get an M2 center in there, but I'm hoping that I don't have to.
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post #24999 of 25005 Old Yesterday, 01:04 PM
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Hmmm... Gooddoc...I've got a similar room situation and you've got me thinking of a phantom center...hmmm....I'll have to test that....but with my 212s, not the M2s. Actually, if I went with a pair of phantom 212s, I might be able to fit some midbasses. Hmmm. Have I mentioned how much I like the upper end on my 212s? Seriously happy with it. Look forward to hearing the M2s but I don't see myself getting rid of my 212s.
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post #25000 of 25005 Old Yesterday, 01:24 PM
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Originally Posted by RMK! View Post
All of my JTR's had this issue and I bought attenuators in an attempt to resolve and they but it was unnecessary. Just set you levels on the 4311 to 80db at the LP and know that ref is -5db instead of 0. You don't need new amps or attenuators and this is coming from someone who has been down that rabbit hole.

Did you try a cheater plug on the amp power cord to get rid of the hum?
Went home at lunch and set all speakers to match the JTR's. I used a radio Shack meter at 80 dB, slow and c settings.

I first measured my JTR's and they were at - 4/5. I actually adjusted them to get them closer to the same spl. Anyway, I upped the surrounds and surround rears so everything was equal to the fronts. First clip was dark night and it sounded fantastic. I actually heard the surrounds more than I ever have with Audyssey setting the levels. Master and Commander first battle scene was awesome as well and again the surrounds and rear surrounds were more present than ever. I enjoyed hearing more out of the surrounds but it's so different than the audyssey settings it may take a second to get used to.
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post #25001 of 25005 Old Yesterday, 03:05 PM
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Just an FYI on some interesting info on running a Phantom Center with DolbyDigital Tracks.

Quote:
Originally Posted by Mark Seaton View Post

This is well documented, but not widely known. It also has some variation with some higher end processors, but pretty consistent with receivers and related brands. I believe Illka posted some testing on this a long while back as well. Fortunately this only applies to Dolby Digital & DD EX decoding. I do not know if this applies to Dolby TrueHD, but it definitely is NOT an issue with DTS formats.

In summary, Dolby tried to "protect" users from clipping the signal chain or over driving smaller systems when the center channel information was routed/mixed to the L/R channels. Most receivers and pre-processors have plenty of digital and analog headroom so in practice I don't believe it was a real problem. Unfortunately it is a decoding behavior to be aware of. When you turnoff the center or surround L/R channels, DRC will be engaged on Dolby Digital soundtracks. It is part of the Dolby spec, so the processors which don't follow this are the exceptions, not the norm. Of course any DTS type track won't have this issue.
http://www.avsforum.com/forum/155-diy-speakers-subs/1445870-reference-level-loud-you-8.html#post22729279
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post #25002 of 25005 Old Yesterday, 03:11 PM
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Thanks for all the help and advice! This sight and friendly members have been a huge help to me over the last several months and I appreciate it.
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post #25003 of 25005 Old Yesterday, 09:13 PM
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Quote:
Originally Posted by Bunga99 View Post
Just an FYI on some interesting info on running a Phantom Center with DolbyDigital Tracks.



http://www.avsforum.com/forum/155-diy-speakers-subs/1445870-reference-level-loud-you-8.html#post22729279
Yes, thank-you for that link. I had known that DRC was applied with certain formats, but had forgot which ones. I'm amazed at what people are able to dig up around here sometimes .
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post #25004 of 25005 Old Today, 07:42 AM
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Originally Posted by Baron5 View Post
Went home at lunch and set all speakers to match the JTR's. I used a radio Shack meter at 80 dB, slow and c settings.

I first measured my JTR's and they were at - 4/5. I actually adjusted them to get them closer to the same spl. Anyway, I upped the surrounds and surround rears so everything was equal to the fronts. First clip was dark night and it sounded fantastic. I actually heard the surrounds more than I ever have with Audyssey setting the levels. Master and Commander first battle scene was awesome as well and again the surrounds and rear surrounds were more present than ever. I enjoyed hearing more out of the surrounds but it's so different than the audyssey settings it may take a second to get used to.
I have noticed this myself. I spent an evening not too long ago in the theater measuring each and every one of my surround channels in comparison to my mains. I was amazed at how much I needed to bump some of them up to get the responses to match accordingly. It was nowhere close to what audyssey ever set, or even my RS meter would show. I ended up backing them down to a happy medium as it was almost overbearing at times.

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post #25005 of 25005 Old Today, 08:01 AM
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I have noticed this myself. I spent an evening not too long ago in the theater measuring each and every one of my surround channels in comparison to my mains. I was amazed at how much I needed to bump some of them up to get the responses to match accordingly. It was nowhere close to what audyssey ever set, or even my RS meter would show. I ended up backing them down to a happy medium as it was almost overbearing at times.
Speaking of surrounds ... when I was at the JBL dealers to hear the M2's, and based upon the recommendation of one of the sound engineers I also listened to these little guys

They sounded really good!. Based upon the early comments about what actually comes out of the Atmos speakers during movie scenes, ceiling speakers for these surround effects might be the one area in a multichannel audio system where timbre matching isn't much of an issue.

For Atmos surround duty, powered and at $150/ea they make an interesting option. Thoughts?

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