ssh

I have everything on my computer, its more of making a medium between using apps and formulas and a basic calculator on re,the12volt,etc. That it can help people make a better decision then using something very basic and broad, but don't know how to use winisd and so forth. At least that's the plan.

At least for when im away from computer...

Yeah. Im going to make a calc for it That way I don't need leap or winisd or a piece of paper and a calculator

Check for belt slip.

It's from winisd, I believe it's the percentage of mach. If assuming correctly and I got 0.04 from winisd, then 0.04*344.8 m/sec = 13.792 m/sec. Does that sound better? Yep. Again, I always just design around the m/s. 14 is conservative, but not overly so Good to know.

All I can do is laugh.

Of course it will be. Vent noise in a home environment on a midrange is WAY more critical than a sub in a car. Okay that makes complete sense, never dawned on me It's from winisd, I believe it's the percentage of mach. If assuming correctly and I got 0.04 from winisd, then 0.04*344.8 m/sec = 13.792 m/sec. Does that sound better?

I guess on a good note, I never bothered to do any modeling with my latest enclosure, just tried to do as large as an enclosure I could fit. Worked out quite well, plugged everything into winisd, Only way I could have gotten a little tad more in 40hz area is if I'd raise volume 2ft^3 and that's not happening (no more space!). Anything less then my current volume and it didn't show any improvement in terms of spl, pretty damn linear actually, rising up to 30hz and plateauing. Shit, I'm starting to sound like... At least I'm using the right speakers in the right application.

I do the same thing, port mach isn't even on the map, no need to worry if you get your area right. Well I checked and the min formula works fine, offering a lot more port area then actually required. The 12-16 rule worked out fine too. At least in my situation. I plugged two 15" xcons into winisd, 30hz tuning, 8.5ft^3 net for enclosure. min formula, 15.28in port diameter, 0.04 vent mach. 12*8.5, 102in^2, 0.08 vent mach. 16*8.5, 136in^2, 0.06 vent mach. Now the odd thing, 3 6" port diameters, which would be (pi*r^2)*3, 9*pi*3, 84.82in^2, yet I got 0.03 for vent mach. That's a lower vent mach then all of the above, yet mathematically it's less surface area. Unless winisd takes flares into consideration? Normally you want the vent mach to be under 0.01, correct?

Gas generator, could you imagine lol. Get some 12v batteries and setup a UPS system, just have to find a way to charge batts first? Not sure how long this could last? Perhaps 20 or so 12v batteries in the closest?

I'm going to follow the min port area from the formula then plug it into a box design into winisd or leap and see what the mach turns out to be. I have a feeling it's going to be a lot lower then necessary. Then I'm going to dance!

Better then formula probably, no need to go overboard on port area as formula might. But this should be better then the 12-16 rule, I think? I should compare it.

Oh shit, I forgot your reading past posts. I was using 30hz.

I bet lol.

Fb is user dependent, tuning of the enclosure.

I'm just giving him shit, I haven't even tried it lol. Speaking of which, anyone ever try Red Tail from ca? Had some when I was up in SF, pretty good beer.

Always wondered if the color just happened to be what it is, or if you missed off Mark or Aaron lol.

Was up North. My title isn't green is it? Nah, purplish pink, just the way you left it.

Well there are two formulas I pulled from his book, This one seems absurd as the port area required is nuts. And the second formula, listed as Small's formula, This is the one I'm relying on. I'm not sure what mach the latter formula is using to be honest. It would vary depending on the power used, or would power be immaterial if it's using Vd already? Modeling is best but I don't see average people taking the time to do it, hoping this would be better then nothing.

Binding posts from parts-express are the shit. http://www.parts-express.com/pe/showdetl.cfm?Partnumber=091-1245 They also make them in anodized silver.

LOL. just hit 95 not too long ago. I rode yesterday and this morning from 8 to 11, it was low 100s...

LOL.

Update, Changed the multiple aero port to the way you suggested Bromo, works the same as the psp calc. Added an option for flared ports or not flared. So now I believe it's correct. Going to do some revision to the suggested aero ports on "find minimum port area". Only going to suggest what you can buy from PE, madisound, etc. Done.

Bromo, do me a favor since I'm doing it wrong. Find the port length required for a slot port, 1"x157" for 30hz tuning, 10ft^3. Now find the port length required for a 14.142" aero port for 30hz tuning, 10ft^3. Would you agree that both ports have the same port area and same port length, therefore they should act the same (aside that the aeroport may have less turbulence,etc)? Now find the area of 10" diameter circle. Now multiply that area by 2 (for two aeroports), now is the final area the same as the above slot ports & 14.142" aero port? Is this any different then dividing enclosure volume by number of ports and finding the length for one? If so, I'll gladly change it. I didn't see any formula for multiple ports in the loudspeaker cookbook, so I simply transferred the combined area of all ports and made it into a single larger one. It looks like the psp site adds one inch to the straight length for the flared length. Now I'm just confused, If I use the calc on psp, if I halve the volume and go from 2 ports to 1 port then the port length stays the same. This does make sense. Now If use the same tuning, volume, port diameter, and one port using the formula from the loud speaker cookbook, it's exactly the same as psp. Now if I change from one port to two ports or multiple, the port lengths drop a few inches. Yet I have the SAME EXACT port area as a slot port (1"x157", 157in^2) and I come up with the SAME EXACT port length. Well it sounded very logical, but your correct Bromo, according to JL: I didn't take "frictional losses" into consideration.

How did you calculate for the multiple aero ports? It all comes down to port area. If you input more then one aeroport, the area of each port is added together, then port length is found for that total port area. Example: 10" circle = 78.54in^2 area. 2 10" circles = 157.08in^2 area. Same as: 1"x78.54" slot port, or 2"x157.04" slot port. That's wrong. You need to divide the box volume by number of ports and use that number and the area of one port. Also not accounting for flares, I wouldn't call it an aero port calculator then. I believe that's just another way of doing it. And I'll look into adding flares and how it effects everything.