Welcome everyone to my little corner of the net. I hope you find the info here valuable, I know I did. Just be aware that this a new site, with a lot of material that needs to be uploaded, so there will be a lot revising going on for the next few weeks. So don't be surprised if a page looks different, or files are suddenly gone. It will be fixed promptly. Enjoy, Brandon |
Added a two tone plot for the 12" woofers to get a better idea of IMD
Converting all files to PNG which seem to be more compatible with IE and Firefox than TIF and GIF. Smaller too.
All files converted to PNG. Added nearfield frequency response measurements. Added two tone IMD plots.
Removed the THD values from the spectrum analyzer pics so they didn't cause confusion. Removed the THD scale from the HD sweep because it was the wrong scale and I like dB scales better. Added the Impulse Response to the frequency response pages. This is the IR of the 1m on axis measurement. These are NOT as intuitive to read as I once thought. If you don't understand the subtleties of what an IR shows don't even bother looking at these. These are extremely difficult to standardize so they are directly comparable to each other. So beware. I also started adding some compression driver info as I just started the horn testing.
Removed the IR because it's already causing confusion. There are two many factors that must be understood and standardized to make these directly comparable, and people don't see that. When I was doing the power compression testing I did make adjust level so that drivers with different sensitivity were outputting similar levels at least in the driver's midband. I'll look at these IR and see if that is standard enough to make them directly comparable.
Added TS parameters for the 12" woofers and a method description on the driver measurement page.
Added measurements of the JBL 354267-001 and Pyle PH612 horns with a proper screw type CD, the BMS 4540ND. Also added some info on my test baffle.
Added Accuton C173-T6-95, 18 Sound 6ND410, Beyma CP385ND, BMS 4540ND 4550 4552ND, B&C DE12 DE160 DE250 8CXT 8NDL51, Selenium D220Ti
Added the last measurements of the last test group, including impedance and xmax results. Note the new Xmax testing protocol explained on this page. Added a combo mid/tweeter horn from QSC under Odditites. The compression driver (Celestion CDX1-1425) is a nice little driver so I did a quick SPL measurement on my standard horn and posted it in the tweeter section.
Added the GPA/Altec 288-16H compression driver on an Azura 425hz horn.
Added pics of the horns and doing some general cleanup of the site.