Posts by diy speaker guy

Quote:Originally Posted by robertcharles that calculator for vent mach is very useful. If you vary only the input wattage you see the velocity skyrocket at every value over 1 watt. try it please. just vary the wattage and the speeds...

Quote:Originally Posted by robertcharles I found a formula on the following link. If you plug in the numbers you get what the simulation says for the port, but as power goes up the percentage of Mach shoots through the roof. It is...

I had a chance to look over the link in a bit more detail. I still didn't get through it all yet but I did notice that the chart you posted is by far the worst looking of the 3. Not trying to imply anything, I assume you posted that...

Quote:Originally Posted by imagic Well then go try it. Then try the same thing with a 4 inch wide mailing tube. the straw is so restrictive, you'll finish yelling whatever you were going to say before you are out of breath. that is...

Quote:Originally Posted by LTD02 i didn't know anything about reynolds prior to this thread either. Ironically, 34000 appears to be right on the ledge before the whole situation takes a dive over the cliff. If my Reynolds number...

Quote:Originally Posted by imagic Try screaming (or better yet, beat boxing) through a drinking straw to see why this idea should have died a long time ago. If you actually could scream through a straw, there will be compression but...

Quote:Originally Posted by LTD02 at reynolds 34000, you are already way out into the transition zone and compressing. On the Moody graph I posted I am midway between laminar and complete turbulence. The graph you posted shows ~ 1...

Quote:Originally Posted by LTD02 while your attempt to employ the moody chart is admirable, you have misinterpreted its application to port functionality. according to empirical investigation at harman and published in the jaes,...

Quote:Originally Posted by mdocod Hi DIY Speaker Guy, I will say based on what I have skimmed that there is absolutely no reason for this to have been drawn out as long as it has been. Simulations are based on small signal levels....

Quote:Originally Posted by imagic The lesson is to always check your data entry into a sim, Ql and Qa are not supposed to be normal data entry items, they should be set to a reasonable value in the program by default. I've never...