DIY Waveguide loudspeaker kit

[PB2]

Originally Posted by markus76

I agree. Movie sound is mixed in studios that really are (smaller) movie theaters. Then there's remastering of movie tracks in normal studios like Mi Casa in LA for Blu-ray or DVD releases.
This makes me doubt that content below 20 Hz was ever intended to be heard on the final medium.

Best, Markus

Ten and 12 Hz content was mentioned in the AES paper because it WAS intended to be heard/felt. The content below the audio band is felt, it hits you in the chest, the floor shakes, and the windows rattle. It adds a sense of realism. Just because there are a limited number of recordings that require such low frequency capability is no reason to discount it for an ultimate system.

Any well recorded action movie with explosions, crashes or whatever will have more impact on a system that goes below 20 Hz.

The subject of the AES paper that I mentioned was the low frequency requirements for "modern" subwoofers.

[gedlee]

Originally Posted by markus76

I showed real examples from real DVDs. So I don't think I'm discussing idealized cases here.

And no, I'm not talking about perfect. Optimum is good enough this time

By the way, what "optimum" is your current optimization algorithm trying to achieve? Only smallest seat-to-seat variation or smooth frequency response or linear frequency response or any combination of the three?

There is a human, me, in the algorithms iteration loop so it is whatever combination of those parameters that I see work best. It's not completely automated at this point. That would be a lot more programming, more than I am up for I am affraid.

[gedlee]

Originally Posted by markus76

I'm always shocked how desolate the audio scene has become:

Watch Johannes Mueller's presentation about "Pure Audio Blu-ray"? You'll find it at http://www.aes.org/tutorials/download/file.cfm?ID=129

They now started to talk about the use of Blu-ray for high quality (multichannel) audio. There's even a standardization project AES-X188. Can you believe this? When was Blu-ray introduced? Where were the AES in the standardization process? This makes them look like hobbyists.

I glanced at that.

The audio video disconnect came about historicaly as the two thing were considerd seperate and distinct - they were back then. They didn't mix in design, manuafacturing, etc. Now they are inseperable and mostly controlled from the video end and the "classic" audio people were out of the loop. I was shocked when I investigated MP3 and found than none of the AES people that I knew were involved at all. It was basically a bunch of SMPTE engineers who knew audio, not the traditional AES guru's. DOLBY was involved and Ray Dolby was an AES guy who I have know for years through them, so the AES was not completely out of the loop. But yes, video and audio have been seperate things for a long time.

[gedlee]

Originally Posted by jason_watkins

To put this back on topic since I just sent in a deposit for some nathan's:

What's delivery trending to right now?

I recall there being a thread with a lot of great content from gedlee about finishing speakers. I can't seem to find it via search. Does anyone have a link? I'd like to do some tests on some small speaker stands I'm building next week.

Its probably about six weeks. Shorter than it was but longer than I'd like.

I don't recal where that was either, but I can refresh.

Assemble the cabinets, fill the holes and seams - Bondo or wood dowels. Then prime with Bins. I first prime with raw shellac by brush since this usually gets absorbed 100%. Then I spray on Bins, the stinky white stuff, Sand, spray, etc. until the finish is smooth. Then I spray on two coats of my satin black, which I mix myself, but any spray color will work. Don't even think about a gloss finish unles you have that expertise. It won't work. A flat and/or textured paint has the best coverage and comes out the best for a novice.

[markus76]

Originally Posted by PB2

the AES paper that I mentioned

What's the title? I would like to read it.

[badman]

Originally Posted by gedlee

I've been streaming from NetFlix for over a year now (a member for almost eight) direct to a PC. But its never even close to what I would call "high-res" - I watch it on my 12 foot 1080p system. The best that I ever get is DVD quality, never 1080 and the sound is always only stereo. Nothing that I have streamed has come in at anything but stereo.

The quality I've seen via the client box surpasses that of the internet streams, for whatever reason.
But you're right, it sure ain't 1080.

[makingmoney]

Can the Abbeys be used successfully about one foot from the back wall, toed in, next to a 42" plasma for HT. Or too many early reflections?

I live in an apartment, not a lot of space.

Thanks

[PB2]

Originally Posted by markus76

What's the title? I would like to read it.

I don't think this is it, it is too early, however it might be of interest:
Edit: I have the paper in my library but don't have the time to search for it;
this might actually be it since I search on subwoofer at the AES site and this
seems to be the best match from what I remember. I posted a reference to
the Bass list 10 or 15 years ago in case anyone here remembers it.
AES E-Library: Subwoofer Performance for Accurate Reproduction of Music

"Subwoofer Performance for Accurate Reproduction of Music"

JAES Volume 36 Issue 6 pp. 443-456; June 1988

"The spectra and the maximum output levels for accurately reproducing low-frequency musical signals are determined from published research and new measurements. Analysis of commercial recordings shows substantial musical information in the octave from 32 to 16 Hz and some down to 12 Hz. Psychoacoustic data are used to establish to what degree errors (such as total harmonic distortion, FM distortion, modulation noise, and bandwidth limits) are perceptible. Criteria are set for proper subwoofer performance at peak sound pressure levels of 110 dB."

[markus76]

I can confirm that Netflix picture quality is better with the Roku box. By the way, Roku is max. 720p.

[markus76]

Originally Posted by PB2

I don't think this is it, it is too early, however it might be of interest"

So does the paper you based your opinion on exist? Would like to read both papers.