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Figure 18.3 (h) in the 3rd edition of my book "Sound Reproduction" shows 0, 30 and 60 deg curves for the AR-9, and it was very well behaved. It got high scores in double-blind listening tests and the anechoic curves show why: flattish on-axis response, uniform flattish off-axis behavior - both...

Hi Gary, Auro-3D is the brainchild of Wilfrid Van Baalen, a Belgian, and is owned or has shared ownership with Barco. Wilfrid owns Galaxy studios, near Antwerp. He is dedicated to reproducing music in all its spatial splendor, and from the small sample I heard, he has succeeded remarkably well...

Hi Gary, I am not your foe. I have been criticized for excessively "liking" reflections, hence my little article. Your approach goes farther, requiring very specific loudspeakers and room setup. You say that it is a universal solution, but the hoards of recording engineers who gravitate to...

Hi Gary, glad to see that you are still promoting your philosophy. I really don't disagree with you. As I say at the end of the piece: "For optimum stereo listening if your music tastes are as eclectic as mine, one really needs adjustable acoustics and, possibly, variable-directivity...

Yes, when you upmix a stereo recording what you get is a lottery because they were never mixed with that in mind. The lack of output from the surrounds is an indication that there is little uncorrelated (difference) information in the stereo signal - most of it is pan-potted mono. BTW, I think...

I suspect that the live sound (i.e. large venue, large audience) equalization would be to maintain a relatively constant overall broadband "house curve" when the audience density changes and the air heats up and becomes more humid during a concert. It would not be able to cope with room mode...

DD66000 Logic 7 is a variable algorithm. It is not the same in all products - unfortunately - even in the old Lexicon processors it would change with time as its inventor thought of "improvements". Nevertheless, it was normally preferable to the alternatives.

DD66000, Re: center channel for music. Several years ago I attended an AES presentation on multichannel recording. The presentations were by, as I recall, three "famous" pop/rock engineers and a senior engineer from NHK, the Japanese organization that has done a lot of research in sound...

j_garcia I hear you about compromise. The good news is that good loudspeakers are very tolerant of room variations. Bass is the challenge. Years ago I became aware of a difference between movie sound and music recordings. Once in a while, after watching a movie that I thought was less than...

Thanks nathan_h. Audio purists have long adhered to the belief that music was the "perfectionist" content, and movies, and home theaters, were somehow inherently inferior. Rubbish! It was movies that motivated the development of stereo, and then multichannel. The music world would have been...

nathan_h and others - if you are able to make high-resolution steady-state LF measurements, you will find the resonances. It is very likely - based on my lifetime of experiences - that there are only a few, probably only one or two problem resonances (peaks) and a bunch of dips. You cannot...

nathan_h Yes movies are more consistent, largely because there are standards for setting up the dubbing stages and cinemas. However, if you read my AES paper it is clear (a) that they are not consistently calibrated, sometimes not at all and, (b) the target curve (the X-curve) is not what is...

nathan_h This is only my guess, but I think they want to give the customer the feeling that they are the ones responsible for everything you hear. You and Warrior are correct in that the right kind of EQ can do useful things at low frequencies, but if that is all the algorithm does it raises...

awdio, I installed seven channels before it was popular - because I simply knew that it would be better than five, and enormously better than stereo. My first surround processor was a Shure HTS. It had decorrelated L & R surround channels, an excellent idea that was copied by THX when they...

Goliath, Good! Because doing "room correction" to hit a target curve above about 200-300 Hz introduces a significant risk of making a good loudspeaker less good. Great self control is required not to want a smooth room curve :-)

Goliath, If you read my latest JAES paper "The Measurement and Calibration of Sound Reproducing Systems" in the July/Aug issue, 2015 you will understand my perspective on "room correction". It is a free download, so AES membership is not a requirement: go to www.aes.org, click on "publications"...

Olivier, Paris is one of my favorite cities - I proposed to my wife there in 1960! We were post-graduate students in London, unable to afford more than a hotdog and coffee on the deuxieme etage of the Eiffel Tower. But, sadly, I won't be at the AES this time. As for the bass absorbers, if the...

Thank you Olivier. I was not aware of this new work. I could not find the aes 139 convention preprint - was there one? In any event, since we started publishing methods of bass control there have been several "competitors", some of which are best described as subsets of SFM, which in theory...

Just a clarification. Multiple subwoofers combine in a room according to their frequency AND phase responses - the transfer function. It is this that must be measured if superposition is to work. It is the performance with all subs simultaneously working that matters, and by starting with...

I had a full cabinet making shop in my basement in Canada. All the goodies, including a central dust collector. I had ear defenders hanging at several places so they could be slipped on conveniently. Convenience is important because we get careless/lazy. I wore over the ear defenders or ear...