A bit later than i wanted, but I finally got the measurements.
This is a graph showing the Neo3 PDRW response curve for with and without the deep cup attached. (1/6th smoothing)
![](https://www.audiocircle.com/image.php?id=223062&size=large)
Red: Deep Cup Green: Open Back
![](https://www.audiocircle.com/image.php?id=223063&size=large)
% THD graph
Aside from the peak at 1.7K Hz, the mod's response is actually quite smooth, esp from 2K-20K Hz.
Open-backed, I'm a bit surprised by the 2dB dip in the response around 2-4K Hz, but it gets some pretty good extension, easily down to 600Hz
I'm actually the most surprised by the rise in THD, esp above 5K Hz..
![Scratch Head :scratch:](https://www.audiocircle.com/Smileys/audiocircle/scratching_head.gif)
But I'll see how the standard Neo3 fares, as well as testing the GRS-3, since it will be a more direct comparison to the PDRW model I have currently
Next time I get to do some testing, it will be with the standard Neo3.
It will also be a little more involved, since I'll need to mod it with both the cup, but also some thick yarn, to be the closest approxiation to Danny's GR Neo 3.