The Emperor’s New Stereo

I was contacted a few months back by Jose Luis Diaz about an article I wrote for Mix magazine -in 1998. He asked did I have a copy of the original in pdf form.  No. I am not the best archivist. Well it turns out he had a Spanish translation of it and he RETRANSLATED […]

Macau COD Tuning: Day 5 (Cardioid sub day)

Looking for Mr. Cardioid During the daytime (remember that we start at 11pm) the crew set up 2 measurement mics for us high in the grid. The mics were placed as a front/back pair in the near field of the coupled subwoofer array. The goal was to measure the responses in front and behind on the center axis […]

OOOPs: Mistake found on “Phase wavelenth intro post”

I found a mistake in the MAPP plot in the intro gallery: one pic had the wrong autocad background and showed the lines crossing in phase where the acoustical was cancelling. I am sorry for any confusion this may have caused.  THIS IS THE RIGHT ONE  (aslo found in the ols post0 6o6

Phase Wavelengths: The End Fire Cardioid Array made visible

The end fire array is one of the most talked about, even if not the most often implemented of the cardioid subwoofer arrays. It can be a challenge to wrap our heads around how we get the speakers to play leap-frog in the forward direction and demolition derby on the back side. Looking at the […]

Phase Wavelengths Intro

So I was getting reasdy for my seminar here in Mexico city. About an hour before and I find that the graphics were mislabeled. Particularly problem was the one that had the wrong autocad backrground – the acoustical cancelled where the phase lines showed IN PHASE. OOOPPPPPPPs. Sorry. Should be fixed now. So I got […]

Subwoofer Delay Taper (Update 1)

Here is a quick preview of my next post.  These plots contain concentric circles. Each represents a wavelength traveled from the speaker at 125 Hz (2.73 meters). The first one shows 7 speakers spaced at 1/2 wavelength (1.37m) and all set to 0 ms delay. The concentric are all the same for the 7 speakers […]

Uncoupled Array Design: Beginnings and Endings (Updated)

** Update:  A downloadable version of the calculator to do this work is available (courtesy of Daniel Lundberg). Go to the bottom of this post for preview and instructions.  ______________________________________ When a coupled array is assembled, its operating range is limited primarily by its power capability. Even very large arrays will congeal fairly quickly and once […]

Phase alignment of spectral crossovers

This is a continuation of the impulse response subwoofer thread. Here are some screens from Sounds Systems: Optimaztion and Design that deal with phase alignment of crossovers. The figure above shows the phase responses brought together between sub and main.  The crossover is not steep and therefore the phase response overlap over a wide range. […]

Training at Disney Animation II: Size Matters

In the world of animation the world can be as big a basketball and a basketball can be as big as the world. In the real world, size matters. Not in the animation world. In the world of animation audio, size does not seem to exist either. Low frequencies don’t have a wavelength in ProTools. Sure they […]

Phase Alignment of Subs – Why I don’t use the impulse response

OK. The saga continues down below………………………. What is the best way to phase align our subwoofers to the mains? There is a hint in the way the question was phrased. I didn’t say time align (and it is not because I am afraid of copyright police). I say phase align because that is precisely what […]