T arrangement of speakers

[Bill Fitzmaurice]

[quote name='gapiro' timestamp='1456236672' post='2986882']
I can think of a tiny stupid reason - is it you have a right angled jack for the kettle lead then it is nearer the speaker for all of a few inches...... maybe a tiny bit more 50hz hum? Surely nothing noticable though.
[/quote]Speaker leads are immune to hum pickup. You can only get hum pickup on leads which carry signal that's subsequently amplified, like your instrument lead.
[quote]I'm intrigued as to why, I can't find anything using the good ol google[/quote]The angle of dispersion is inversely proportional to the size of the radiating plane, as demonstrated by this:
[media]http://www.acoustics.salford.ac.uk/feschools/waves/flash/diffractionslider.swf[/media]

This specifically shows the effect of a diffraction grate, but the same physics apply both to the size of a driver and what happens when multiple drivers are placed side by side. If you've ever wondered what was the deal with the vertical slot on some old Trace Elliot, now you know.

Edited February 23, 2016 by Bill Fitzmaurice

[MoonBassAlpha]

Strange that no one else used the vertical slot if it is a sound idea acoustically (pun intended)
It was only used on the 1x10 combos, which would have suffered least from the issue anyhow. Odd.

[Guest bassman7755]

[quote name='MoonBassAlpha' timestamp='1456389960' post='2988444']
Strange that no one else used the vertical slot if it is a sound idea acoustically (pun intended)
It was only used on the 1x10 combos, which would have suffered least from the issue anyhow. Odd.
[/quote]

I would imagine that there are resonance tuning implications with having a semi-enclosed volume of air in front of the driver.

[Bill Fitzmaurice]

[quote name='MoonBassAlpha' timestamp='1456389960' post='2988444']
Strange that no one else used the vertical slot if it is a sound idea acoustically
[/quote]TOA did. But slot loading comes at a price, that being a reduction in high frequency sensitivity, as the result is a band pass alignment.

[MoonBassAlpha]

Was the TOA part of a 2-way setup? Presumably the tweeter or horn would take care of the highs and the band pass response might even enable the use of a less complex crossover

[Bill Fitzmaurice]

[quote name='MoonBassAlpha' timestamp='1456407455' post='2988663']
Presumably the tweeter or horn would take care of the highs and the band pass response might even enable the use of a less complex crossover
[/quote]Only if the crossover frequency is low enough. The lower the crossover frequency the more expensive the HF drivers and crossover components. That's probably the main reason why slot loading isn't common.

[MoonBassAlpha]

Thanks Bill, always interesting and informative.