Great to see so much documentation and real world observations.
Great work Josh!
Originally Posted by beastaudio
This goes back to a discussion I had a while back with a few other guys of just that "real world" performance that cant really be explained by graphs. I feel like sometimes there is a missing piece that hasnt yet been quantified. Tony123 and I seem to have "heard/felt" it but I guess it is something that really cant be put on a graph... I know there is absolutely no SCIENCE to that statement but hey, there are lots of us Im sure that go on more than just fact...
There is actually tons of "science" to your statement. Anyone who's had to do a high school or college lab report has had to include an "observations" section. No set of data is complete without observations from performing the tests. Those who did more than a few lab reports in school probably recall that it was in the observations and conclusion section where you would be able to cover your backside when the experiment didn't work as expected. Observations and comments are critical for any sort of testing, especially when taking a limited set of measurements which can't possibly encompass all various aspects of operation and application.
Measurements never *fully* guarantee that a speaker or subwoofer sounds good. A good set of measurements will indicate that you have ever expectation the subwoofer will function well, but someone has to turn it on and give a quick listen to insure something obvious wasn't overlooked. Rubs, buzzes and funky, high level mechanical misbehavior does not readily show up in most measurement sets.
As a simple example, what posted measurement describes the sound of the Sundown driver reaching it's mechanical limits? How about the measurement that tells us what an LMS 18 sounds like when it smacks the spider riser?
This in no way diminishes the value of the measurements, but merely acknowledges the limitations and assumptions inherent to them. If you plan to never get past the ideal operation, those differences don't mean much. If you have a design where that is a real potential, then it most certainly matters.