Mind the gapA short time ago I was very fortunate to have gained access to a former air force base featuring ample real estate with a solid underground.

An ideal environment for subwoofer measurements where I got to measure all typical inverted stack cardioid setups.

And while I’m still in the middle of processing all data, I would already like to share one preliminary but potentially interesting observation.

Hypothetical question by Bob McCarthyfigure 1I can tell from my seminars that the impulse response or simply IR, remains an abstract to many. But, if you think of the impulse response literally as an audio track in a Digital Audio Workstation (DAW) like Pro Tools, Logic or Reaper, it might come more naturally in the future.

Which sub to reverse? Part 2In Part 2 of this series of articles, we discuss the trade-off for trying to achieve maximum coupling in front of a ground-stacked cardioid setup by reversing the bottom subwoofer.

Which sub to reverse?Which subwoofer to reverse in a vertical ground-stacked (half space) cardioid setup remains eluding. We all know that the physical displacement of the speakers with respect to the floor determines whether we remain coupled and therefore efficient.

Where to time align center sub?figure 1One of the more prevailing questions after "Where to time align the subs?" is typically "Where to time align a center sub?".

When we introduce physical displacement between loudspeakers in multiple dimensions, we end up creating triangular pyramids with sides of different lengths between the loudspeakers and listeners.

These path differences create additional time offsets which make it even more challenging to remain time aligned for as many spectators as possible.