12/10/12 at 12:10pm
Posts by diy speaker guy
12/10/12 at 3:10am
I have no idea what that means but I do agree it does sound interesting, all of this is very very interesting. In fact it keeps me up at night sometimes. But I really have to go to sleep. Hopefully we can continue this tomorrow.Thanks for discussing the actual details of this weird design. This is by far the most stimulating and on topic part of the conversation so far.
12/10/12 at 2:33am
12/10/12 at 2:31am
How do you know that's the proper thing to do? It looks like a horizontal line below 20 hz to me. In fact in the text in the green box below the graph it says so. Not directly I guess, but that's how I read it.How do you extend the chart to see more of it?
12/10/12 at 2:29am
12/10/12 at 2:22am
Ok, so I poked around a bit at the link you provided. It's not the first time I've been there but it is the first time I've downloaded the Flare It program.So here's what I found, a direct quote:And here's a picture of the Flare It program. This pic is telling me core velocity is fine at 10 m/s below 20 hz. I don't know how to change the graph to show 2 hz, but it appears the red line probably extends horizontally below 20 hz, in other words my core velocity is fine...
12/10/12 at 12:49am
Those are not the parameters I used, I used the manufacturer's published specs. It appears you might have used the DataBass measured t/s but you left Le at zero. (I admit, I used the specs that I did because I liked them better and this is just an intellectual excercise anyway. No way to tell which is going to most accurately reflect the finished product anyway.) But the 20 inch shorter port in your simulation makes a big difference. You need to change that, but as it...
12/10/12 at 12:43am
12/10/12 at 12:17am
Neither of my simulations show anything close to that, both of mine are around 30 m/s and there's not really any content at 3 hz anyway. What software are you using? Are you using manufacturers t/s or DataBass measured t/s?EDIT - I see the problem. Add 20 inches to the port length to match my simulations and you should see the same port velocity I show in my graphs. Why did you change port length in your simulation? Changing the tuning creates a whole new situation -...
12/9/12 at 10:43pm
Well, I waited with my breath baited (whatever that means) for Mark's reply but he's either busy, gone to bed, or completely bored of this already. In anticipation of his response, the only thing I can possibly imagine he is talking about is "skin effect" or whatever it's called, where the port walls provide friction so the air right up against the wall doesn't move much, effectively decreasing the apparent diameter of the port at higher volumes. So I'll assume that's...