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[Elliot Thompson]

First. Thanks Too Tall, for going through the trouble
in measuring these boxes.

Quote:

Too Tall's Thoughts Viewing The Graphs We see the box "lab 1 z" has peaks a little bit lower. The bottom peak is shifted down only 1.5Hz so I don't know that we can read much into it.

Here are the direct links for future reference


http://hometown.aol.com/askelloit/Graphs/LabSub01.jpg

http://hometown.aol.com/askelloit/Graphs/LabSub02.jpg

All questions, please refer to Too Tall

I'm just the Roadee  

[Too Tall (Curtis H. List)]

Elliot Thompson wrote on Wed, 10 November 2004 20:53

First. Thanks Too Tall, for going through the trouble in measuring these boxes. Quote: Too Tall's Thoughts Viewing The Graphs We see the box "lab 1 z" has peaks a little bit lower. The bottom peak is shifted down only 1.5Hz so I don't know that we can read much into it. Here are the direct links for future reference http://hometown.aol.com/askelloit/Graphs/LabSub01.jpg Hey Elliot, Sorry but you have the labels reversed. The top one compares two boxes in use for some time. The bottom pictures shows new versus one of the old used boxes. If you look on the bottom of the graphs you see a Praxis label and a red line showing it belongs to the red trace. Just above the graph is the label for the yellow trace. All the readout markers work only for the yellow trace. You see that the two old boxes are not exactly the same. The impedance peaks are shifted slightly in frequency. When I first did a comparison new to old I happened to pick the one with the shifted peaks so I thought it was from a "burn in" process. In fact the other "old" box lines up perfectly with the "new" for frequency. The difference for "burn in" is that the magnitude of the impedance peaks have changed. If we can believe the graphs from only a few boxes the impedance magnitude has gone down some. NOTE: I have now idea which of four boxes the "old" impedance measurement came from. I leave it to the people with the modeling program to guess why that might be. It would take digging the drivers out the box and checking the T/S to be sure. All this could be from variations of the drivers as they come off the production line. The change is very slight. Too Tall PS-Thanks for the effort Elliot. http://hometown.aol.com/askelloit/Graphs/LabSub02.jpg All questions, please refer to Too Tall I'm just the Roadee

[Elliot Thompson]

Error Corrected

Thanks Too Tall.

Best Regards,