Originally Posted by grushaaa
Wow, amazing work! Bass like subwoofer! Maybe you give a photo in what place did vented hole
Yeah but you realize the graph presents difference between vented and non vented drivers, right? which means that vented driver improves around 3dB over the non-vented in lowest region.
However in my opinion this still doesn't represent what is happening.
Please check graph below. It's 37A007 and vented version 7C/8, same tubing, brought to 1kHz to show the difference. Measured with IEC-60318-4
As you can see there's pretty much no difference in sine-wave graph in bass region other that 1dB difference. Both drivers works flat. However what happens in CSD is another story and that probably counts more.