Originally Posted by UK Dreamer
That is perfect Jonny. And just what I needed to hear (read), it keeps me a pound or two below my max hold baggage allowance, so should have no problems getting these home.
I'm still deciding whether to go sealed or ported. Did you design and model these yourself, or are they a mod of a Marty?
Also, I've been meaning to ask, as the pipework looks like regular plumbing stuff, but if so, how were the flares created - I've not seen anything like that at the hardware stores.
Again, many thanks for your help.
Edit: just read that you created the 'radius' at the end. How is that achieved? Is it something that a hobbyist with no experience might be capable of?
Phil, I have been making bellmouths for EFI inlets for my racing engines for years using this technique and thought it would be a good idea for ports for the sub.
For the race engines I make a form from scratch....but for the port I just wanted something quick and easy so I raided the kitchen.
-I 'thought' my idea was original but here is a vid that uses the same basic technique.
Parts express recommendations:
Home theater/stereo recommended alignments
• Sealed (home theater/music): 4 cubic ft. (net internal, not including driver) for an f3 of 31 Hz, f10 of 18 Hz with a Qtc of 0.72
• Sealed (music): 7 cubic ft. (net internal, not including driver) for an f3 of 31 Hz, f10 of 15.8 Hz with a Qtc of 0.62
• Vented (home theater): 8 cubic ft. (net internal, not including driver or vent) tuned to 20 Hz, with 3 flared vents 4" diameter by 28.5" long, for an f3 of 18 Hz
• Vented (infra-sub): 12 cubic ft. (net internal, not including driver or vent) tuned to 15.5 Hz, with 3 flared vents 4" diameter by 32" long, for an f3 of 15 Hz
• Infinite Baffle: Approved (reaction force cancellation recommended )
I built mine at 9.5 cf with 3 flared 4" vents 30". I was just being lazy and used these dimensions without running the specs (sort of a split between the '8cf and 12 cf') in a modeling program. I also had some physical constraints (limited opening width behind my screen wall) that I had to deal with.
Truthfully after hearing the vented, if you have the room I would HIGHLY recommend running 8cf+ vented.