Quote Originally Posted by GM View Post
Again, (1) 8" dia. = 8^2*pi/4 = ~50.27"^2 pipe is sufficient, ergo (1) 6" dia./side is plenty: 6^2*pi/4 = ~28.27"^2*2 = ~56.55"^2 and since this is a corner loaded cab I'm hoping that the additional calculated length due to the additional frictional losses of multiple vents with a larger total area (CSA) will be shortened back to the 'ideal' 4", but only measurements will 'tell the tale', so if a potentially few Hz higher Fb is a big deal to you, then start with 5-6" long vents and shorten them if these tune them too low.

BTW, measured the 6" rated Schedule 40 pipe at Home Depot yesterday and it was 6.125" i.d., making them even larger/longer, so wouldn't hurt to accurately measure yours just in case.

GM
OK GM, I was getting confused about the 8" pipe you are talking about.Since I'm not using 8" I'm going with 6" flared port tubes(Kits).And I must admit I was quite a bit confused on what size you were actually trying to tell me. Were just waiting for them to be delivered now from PE. But I'm putting 1 vent on each side of cabinet so there will be 2 vents per cabinet 4 total for both cabs and they will be 3" from the bottom. My biggest worry was that they would be too big.WRT the higher Fb I would be happy with them being close to 30 Hz or thereabouts it doesn't have to be exact.I think the cabs will have plenty of bass.

These port tubes are 17" long so I can shorten them up quite a bit as you recommend 5-6" I think I will start with them long as I can always cut them down,but can't add it back and at almost $32 each I don't want to make a mistake.


Again I was worried that 2 round 6" ports on each cabinet was going to be too big.That was what I guess I was just trying to verify.But as you say it will be fine as I will be tuning in room by shortening the ports.See I told you about your patience.First Class Thanks GM !! :2thumbsup: :thankU: