- Thread Starter
- #101
I've been out of town at an event all weekend and didn't have time to respond to the recent comments. So, I'll address them generally here.
I appreciate your feedback and concern about the accuracy of the LF measurements with complex summation of multiple woofers in a large sound field. I don't take any of it personally. I do, however, hate to see an entire test's discussion be narrowed down in to this one aspect rather than discussion of other aspects of the speaker's performance. It's not just this thread. It happens in others as well. I think that's a shame. Thus, I voiced my concern with it. Of course, it could simply be there is no other interest so the LF topic remains. That's fine.
As for what I can do about LF accuracy of large and/or complex sound fields:
My hope is that between Amir and I we can capture the large majority of items that we (the community) would benefit from. Amir is busy with things other than just speaker testing. I am busy with my daily life (family first, job second, dogs third, testing fourth). Don't forget we also have @napilopez doing incredible work without a nearfield scanner. The audio community is getting mounds of data from all sorts of great sources (for free, no less). I just ask people to be realistic about expectations and timelines. Be patient. Be understanding. We will all benefit.
Thanks for the feedback and understanding.
- Erin
I appreciate your feedback and concern about the accuracy of the LF measurements with complex summation of multiple woofers in a large sound field. I don't take any of it personally. I do, however, hate to see an entire test's discussion be narrowed down in to this one aspect rather than discussion of other aspects of the speaker's performance. It's not just this thread. It happens in others as well. I think that's a shame. Thus, I voiced my concern with it. Of course, it could simply be there is no other interest so the LF topic remains. That's fine.
As for what I can do about LF accuracy of large and/or complex sound fields:
- With respect to placing the mic as far away from the DUT as possible, I have already added the r-axis extension to my measurement rig which pushed out my initial NFS measurement radius another 18-20 inches (ballpark; I don't remember the exact number off the top). I don't know if Amir has installed this extension on his setup or not (I know it comes with it; I don't know if he added it). Nor do I know that Amir has room for it. Nor do I know if he needs it. He has the z-axis extension which allows him to measure speakers vertically whereas I have to lay large ones on their side so if anyone here has the better chance at measuring tall speakers from a further radius then it is him. Those are things he can address - here or in another thread - if he wants to. IOW, I have reached the physical extent of my system. However, a large radius is certainly not needed for smaller, less complex speakers. Both Amir and I have shown that.
- I will supplement all reviews of speakers of this nature with an additional ground plane measurement. I will also provide Klippel with this data in order to hopefully find some sort of understanding of the results and my measurement rig and room. I will be starting with providing a GP measurement of this exact speaker within the next few days. Luckily, I haven't sent it back yet.
- I will do what I can outside of physical setup to improve this but as I have shown, the fitting and other spatial aspects are as good as they can be. IOW, I have shown full optimization within the physical constraints I have. I may simply be at the end of my rope here with the limits of what I can accommodate. Truthfully, however, I am happy I was even able to measure these larger speakers at all. Because going in to this I expected to be limited to bookshelf-sized speakers anyway. The fact that I am able to measure somewhat-large speakers with the NFS is great.
My hope is that between Amir and I we can capture the large majority of items that we (the community) would benefit from. Amir is busy with things other than just speaker testing. I am busy with my daily life (family first, job second, dogs third, testing fourth). Don't forget we also have @napilopez doing incredible work without a nearfield scanner. The audio community is getting mounds of data from all sorts of great sources (for free, no less). I just ask people to be realistic about expectations and timelines. Be patient. Be understanding. We will all benefit.
Thanks for the feedback and understanding.
- Erin
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