Best sounding combination for Altec 416A

[GM]

Thanks for the information,a friend suggested to go for 360 litre Onken cabinet..........

Again, fine for an original 416A, but big as it is, maybe ideally too small for a GPA re-cone and your only tuning option is to damp or completely block off one or more of its multiple vents. WRT to a high SQ app in general, some of mine and others thoughts here: onken Onken w or A7 or Valencia - diyAudio

GM