Sorry, typo. Yes, it should be 30mm. Just watch the sizing (tube thickness) so there's sufficient clearance to the back of the driver! This isn't one for my favourite heavy-duty cardboard map tubes as some may end up being a bit too thick. 😉
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Possibly. Or it might be simply because they were a well-designed speaker of their type, and you like them. Nothing wrong with that!
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I was looking through my scrap box to see what I had that was round and about 30mm dia. Closest I could find was some leftover sink tailpiece that's about 1.5" OD with wall thickness around 0.065". Works out to an ID of 34.8mm so I recalculated the port length to be 131mm or so.
I'm building the 2-driver unit as my first build getting back into speakers after a decade break. Was hoping to get your advice Scott as 15-20mm felt has been impossible to find at any sort of reasonable price in consumer-level quantities down here in New Zealand, so was hoping for a guide on alternatives? Would a couple layers of woolen moving blankets work? Or possibly 500gsm woolen weed mat?
Appreciate any help you can spare.
The moving blankets look a bit better for this application than the weed mat. Haberdasheries & craft stores are often good sources of suitable materials -lower density cotton or bonden polyester up to 30mm should be fine for this application. It's not overly-critical in detail terms.
