NB50

That is what I was thinking.

I calculate it to be at ~ 2.06 @ 34hz.

The calculator gives you the net volume without driver displacement. 2.65ft^3 With driver displacement I got you at ~2.5ft^3 @ 39hz.

I wouldn't, the power at 2ohms that amp produces should be more then enough to get that driver moving good.

This looks like your trying to sell them.

If you don't mind me asking, how did you measure your impedence rise? I'm kind of interested to see where mine is at. Hold a DMM to the leads at the amp and play something. You can't measure resistance/impedance with power applied. You have to take voltage and current measurements then calculate it.

B.B. King - Recession Blues

Aside form emailing hifonics and hoping to get the information you want, sending it to a company to see if they can do some thing with it, or hoping someone has the dimensions I don't know. Edit You work for a tow company right. The guys in your shop should have the calipers to measure what you need. If not I'm sure you know a shop that should be able to do it.

http://www.quarter-wave.com/

I was going to suggest an ABC box, but that would be huge for two 15's.

How much space do you have and what size Q's are they?

Any reason why you picked the line length for the FS of the driver?

Yes, Alpha. Didn't know the beta had that feature. I guess I just need to test different ones out.

To know for sure your going to have to take measurements, ie bolt hole diameter for basket, coil ID and OD etc.

I hope your not using a CRT monitor, the magnets aren't shielded and could interfere depending how far away they are.

why did you pick that value? I believe winISD Beta doesn't like you to have a port velocity above mach .14. But that's almost 50 m/s. Maybe I'm misremembering. Oh and I need to correct my units from before. I meant 20-25 meters per second, not feet. Big difference, whoops. The place in winISD I found recommended 17m/s, Help>Contents>Using WinISD pro>Graph types explained. Unless you know of somewhere else. Maybe I should have started a thread, there is some good info floating around here. Then I've found various other sites recomending other speeds, I should go threw the bookmarks to find them but that could take awhile.

ouch.

why did you pick that value? I recall reading somewhere that 10% of mach was an acceptable speed for port velocity, but I also have seen 5% and 15% as acceptable. If you notice 5% of mach is right next to it in D24 also. I am looking for that value as I've heard different values and am not sure what is acceptable.

I made the sheet, and there is no equation in C24 that is a static number that is 10% of mach. The cells below it say if there will be port noise based on it.

I think it's something like 20-25 f/s. hmm there is some numbers I haven't see yet. I've seen 113.12f/s, 56.56f/s, and now 20-25. See what I am doing is update some of my box calculation sheets with a sort of air speed indicator. It calculates air speed for each frequency from 10Hz to 70Hz in intervals of 2.5, then based on a predetermined number(what I'm trying to figure out) tells me if there is port noise or not. It may be a fruitless effort but it is kinda fun to see/do. That is because it is dependent on the area of the port. Smaller ports chuff at lower velocities. Yes, but there should be a number that say I had 30in^2 of port at 30hz, will it chuff? If I had that number then all the frequencies above it should be fine. Like this is what I am doing, all air speeds are calculated using port area, power handling, and reference efficiency of the driver.

I think it's something like 20-25 f/s. hmm there is some numbers I haven't see yet. I've seen 113.12f/s, 56.56f/s, and now 20-25. See what I am doing is update some of my box calculation sheets with a sort of air speed indicator. It calculates air speed for each frequency from 10Hz to 70Hz in intervals of 2.5, then based on a predetermined number(what I'm trying to figure out) tells me if there is port noise or not. It may be a fruitless effort but it is kinda fun to see/do.

Does anybody know the maximum air velocity in a port before noise occurs?

Assuming both are setup properly Then it would be the one without any problems.

The one that is installed better.

http://www.soundsolutionsaudio.com/forum/i...showtopic=27002 http://www.soundsolutionsaudio.com/forum/i...showtopic=26951 http://www.soundsolutionsaudio.com/forum/i...showtopic=27016