1. ## multiple ports

it featured quite a lot of angles, so I had to do some more calculations than a normal rectangular box...

after testing the volume in winisd pro, i was convinced...

everything was all fine and dandy......until I saw the port velocity... i remember in winisd beta, the mach figures would turn red after .16 or .17... I assume this would be audible air turbulence... but in winisd pro, the velocity was off the scale...way over scale..I'd need 8 ports to reduce that to a minimum...

Hmm, so alright, I thought I'd go with 4 X 4" ports instead... so the velocity dropped a considerable deal, but the length...whoa...50"?? 90"??? wtf???

questions

1. If I use 4 ports, then do I divide the total length by 4? or do all 4 ports have to extend to that impossible length?

2. So I thought about a slot port too... 5cm opening would create too much turbulence, so i added just a couple more cm... but the length would sometimes reach another 50~70"... so bend the ports, yeah... but it would mean that I'd need more than one bend, cause the maximum width I have is 37" (with 0.75"MDF).. what are the consequences of having a 180 degree bend? What if I have about 2 180 degree bends? (aside from the volume that the port will take)

2. having more than one bend shouldnt matter so long as the overall port length isnt affected....

3. Originally posted by Jmac
You want to keep port velocity below 30 m/s, although some people would consider a 35-40 m/s peak acceptable ...
hmm... well, what else can I do about the impossible length?

for instance...

2 X 3" ports

30" length.... does this actually mean two 3" ports, with a 15" length, or must BOTH the ports be 30"?

4. i would think it would be 2 ports 3" in diameter and ech 15" long...... i recomend actually using pvc pipe...that way u can ge the u joints and all to make the port......but whatever works for u.....peace

5. ok i think i was thinking that the original was one 3" port that was 30" in length.....sorry.....jmac correct me if im wrong....but couldnt he go w/ 4 3" ports 15" long then??? or is my logic flawed?

6. lost me?? ohh well....i probably wont ever go ported so ohh well

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