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 […]

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 […]

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 […]

A Concise Article on Cardioid Subwoofer Arrays – by Steve Bush

This article  Tech Talk: Building Directional Subwoofer Arrays Working toward consistency. was posted just today on the ProSoundWeb by Steve Bush. Well written, concise, plain English and NO MATH!  (lo siento que no es Espanol pero tiene fotografias). I need say no more.  Geez.  That was the easiest post I ever did! 6o6

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. […]

Cardioid Subwoofers

A hot topic of discussion is cardioid subwoofers, so this will be the place to get that topic going. At the moment I will use this as a test to see if I can upload a few graphics from the book here.  The first will be some pics that describe the behaviour of end-fire arrays. […]