Hello RW, just logged in to see your question.
I started to use the ‘G’ for indicating the models as SL’s Grand line up of ‘full range’ speakers.
The idea was to use that just in case SL would continue their hybrid series and could use another letter (perhaps ‘H’ for hybrid)
But I don’t expect them to continue because the full range are really the essence of Sound Lab.
Note: I just thought G for Grand sounded/looked better than ‘F’ (full range)
G990-7C-U (or with ultimate trim) would be the full model name for 9 foot, steel frame 90 degree.
The paint color also could be added to the model (don’t have to be black)
Please ask anything!
Thanks.