i just wanted to run this by you guys to see what yall come up withi have very little trust in BB6....the box outside is 39cm x39cm x90.9cm... mdf is 1.8cm....tuned to 38.22 port is 30.5cm x 4cm and the length i get is 35cm. 2-12 subs each with a displacement of .094 cf.... .188 cf total. if you look there is a 3.5" difference between MY BB6 and win-isd.
i am wanting to use a "T" port b/c of the box and everything else...i would measure it from centers... right? then both sides of the T...right and left ...would be the same length
yea i had that problem getting different thing from the 2 programs but the only thing i could see is that win isd doesnt subtract port area and it hadd something about a end correction and i have no idea still wat that is
but in both programs the net volume is the same. 3.5" is alot.....too much to build a box with that much difference
well to use that you must convert your port area to a round port with the same area. I've never been 3.5 inches off before when comparing some online calcs to winISD
ok...after looking closely at the formula it is easy...no problem....thanks again!!!!! i will make a spread sheet for your formula Aznboi and post it. i already did the one from the12volt.
i seemed to figure out the problem i was having in BB6. I am useing a slot port and when i convert it to round the area is the same but not the primeter. I design air (hvac)systems and that i know that round duct has less drag/friction loss than square duct. So i can only reason that BB6 also knows this and is adding length to compensate for the drag/friction loss. Does that soud right or does it seem that i just pulled that out of my ass?
nice word...laminar.....i was going to use "laminar flow" but did not know if anyone would know what i was talking about
i was having with BB6 giving "wrong" port length's so i reinstalled it and was wanting to check to see if the problem was fixed...so i did it old school and the port needed to be round. i did not understand why the length changed going from a round port to a slot port. In my case the slot port was 1.75" longer. BB6 know's that there is more primeter with a slot than with a circle....so there is more laminar flow. that is where the extra length comes from.
