Timmahh wrote on Sat, 05 June 2004 18:42 |
In the process of building 5 or 6 pair of Labs. 4 pair for a guy, and 1 or 2 pair for our personal use. When we have 5 pair complete, was wondering if any of the Professionals would be willing to come up to Michigan, Saginaw Bay City area, and do some stacking measurements using Smaart. . |
Timmahh wrote on Sat, 05 June 2004 18:42 |
We are thinking of starting with one pair, then 2 then 4 then 6 ect.... and taking measurements along the way to be posted for those out there wondering how they would preform in various set ups, i.e. vertical side by side, horizontal stacking ect..... Most likely this will be done outside, unless we can find an inside place willing to donate an area large enough and with the open time to do some inside tests. let me know. |
Timmahh wrote on Sat, 05 June 2004 18:42 |
Too Tall just posted a message about "guidelines" for use for a single Sub/ pairs/ ect... and the possible results using a modeling program. Maybe we could work this together to get modeling reading compaired to actual use readings... |
Timmahh wrote on Sat, 05 June 2004 18:42 |
I'm sure a few of the Michiganders in this perticular area would like to make it if time permits them too. But was hopeing some of the more Prominant people involved with this site would/could be willing to come up n lend their expertise on this endevour. As its been stated on various posts already; Inquiring Minds Want To Know. We are thinking the 1st or 2nd weekend of July at this point. Of course there will need to be some co-ordination of minds, time, and the like, not to mention enough power to do this. we have some but nowhere near enough to run 4 - 6 pair. Any thoughts or interest out there? Everyone would be welcome to attend, but are hoping some of you experts can make it too. let me know. |
Timmahh wrote on Mon, 07 June 2004 23:57 |
this makes me think of the Madison knockoff with the plexi cover, what if we could get a thick piece of plexi, like 1/4 or 1/2 in, or maybe even a thick piece of glass just to measure the cone movement. i would think I could find an associate in my area, willing to get me a piece cut in a circle. use it just for measurement. make it air tight. ect..... thoughts |
John Sheerin wrote on Mon, 07 June 2004 13:03 |
>We can't physically tell how far the cone is moving other then through predicted SPL. Curtis, Use an accelerometer. I did that recently (thought I mentioned that to you in email), and it worked quite well as compared to a laser. It works especially well considering the price and that you can't point a laser at the rear of the cone in most typical situations. I used a Measurement Specialities ACH01 that I bought from Digikey a few years ago for about $20. It needs a preamp but the data sheet gives a simple circuit for building one. You could work out a chart of what accelerometer voltage gives xmax at various frequencies if you want a real-time indicator. The things come calibrated, although you do need to account for the voltage gain of the preamp. John |
John Sheerin wrote on Mon, 14 June 2004 08:57 |
Double-sided tape - never fell off. John |