How to stack loudspeakers

August 25, 2021
 by Paul McGowan

2 comments on “How to stack loudspeakers”

  1. I call it ‘Pseudo-D’Appolito’ design Paul; but hey, that’s just me 🙂

    Example:
    I had 2 pair of System Audio – ‘SAXO 5’ standmount (bookshelf) loudspeakers that I stacked the right way (tweeter to tweeter) with a little ‘BluTac’ in between.
    By having the 2 mid/bass drivers, instead of just the 1 on each channel, the bass response in the room was much improved.
    However, even with the tweeters as close as possible to each other (4.75″/12cm apart) there was some noticeable ‘comb filtering’ going on in the high frequencies & this was made obvious to me when I removed the ‘top’ pair of SAXO 5’s & just ran the bottom (single) pair.
    A true D’Appolito designed loudspeaker system will only ever have one tweeter at it’s centre for this very reason.

  2. About the time Harry Pearson wrote about stacked Advents a friend was looking for a system. He was considering the stacked Advents and borrowed 4 Advents. We stacked them tweeter to tweeter and compared them to my speakers. We preferred my speakers. But then I asked about trying single Advents. The focus of the elements of sound was way better with singles than with doubles. The tweeters even stacked closely were still too far apart and the interference affects fouled up the crispness of the image significantly, I recall a British magazine, on another set of speakers with multiple drivers, using the term sonic wodge of sound to describe them. They might as well be talking about double Advents or probably any double stacked speakers.

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