Reply To: Ringing Out The Room – Channel or Overall PEQ?

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Dick Rees
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The two angled sides are at 30 degrees (just found the manual) so that’s 120.
Ten degrees off by eye from memory isn’t too bad 🙂

This is the recommended configuration for pairing the speakers, and from experience with them, it works. No combing that I can detect…

OK…

1. 30 degrees doubled is 60 degrees, not 120. From the pictures, the angled portions are on the rear corners, but they ARE there.

2. This is not really a fair comparison for the OP and those using the 450’s as the Tannoy is designed for a bit of a different purpose. It is an install speaker, so designed for indoor, permanent deployment. It’s maximum rated (peak) output is 119dB which, in the world of PA speakers for bands and such, is just not nearly enough. The Mackies mentioned are rated at 127dB in comparison…twice as loud, but still kind of low-end for real PA work.

3. If you want to hear the comb filtering, play pink noise through the system and walk across the sound field. Hear that “swishing” sound?

Comb filtering will not be perceived readily from a fixed listening point by the less experienced. Yet it will still render any accurate EQ’ing less effective…or not at all effective depending on the severity of the cancellations/reinforcements.

I remember one folk festival where they’d hired someone to provide sound…who just stacked up a pile of mis-matched speakers in a pyramid on each side of the stage. It looked impressive, but the comb filtering was severe enough to manifest itself thusly:

When the mandolin soloist (PHC alum Peter Ostroushko) played an ascending run, scale or arpeggio, the notes at the points of maximum interference disappeared while those at the points of maximum reinforcement jumped out louder. This was audible to anyone in the listening area, although the affected notes would be different for those at different listening positions.

What one strives for is uniform response across the spectrum. The fewer speakers, the more even the response. Once you have more than a single speaker, you MUST deal with the fact that there will be interference. The task is to minimize it. There are various ways and considerations to be taken into account.

DR

PS

The VX8 is a 90×90 conical pattern, so as a PA speaker for the typical performers, a significant portion of the (limited) sonic energy available is wasted in the vertical plane…where it will tend to reflect off of the ceiling and cause yet more problems with clarity. Basically, they are install pieces which should be deployed to their best advantage. For real-world PA work they simply do not qualify…no matter how good they sound in the near field.