Apparently acts as a low pass filter for the woofer. Didn't get any further but the whole white paper is available for download here:
https://www.bbc.co.uk/rd/publications/rdreport_1967_57
https://www.bbc.co.uk/rd/publications/rdreport_1967_57
the BBC slot... revisited
Can somebody technical explain the advantages of this configuration?
My interest is piqued because Graham Audio will soon be introducing a significantly updated version of the LS 5/5, with just such an aperture (or two) incorporated in the design.
Prototype (not the finished article) pictured here: https://parttimeaudiophile.com/wp-content/uploads/2019/05/Munich-2019-he-graham1.jpg
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