So, I've just recently returned to DIY Speaker building and have a full "kit" for some small monitors already sorted (look at Wayne Jaeschke's DBP HERE). Purchased probably in 2005, if I recall correctly. Yeah, it's been a long time...
But, that's not what my question is about. I have some surpless North Creek Music Systems D25 1" matched tweeters that I'd like to use, very much like Wayne's "PeeCreek" project. Only, since the 850122 wid-woofer is long gone, I've looked into some alternatives.
My best, closest match was the Peerless 830874. I could have gone with the 830883 but hated the silver frame and questionable performance benefit for the price, or even the Nomex version 830875. In the end, the price/performance ratio of the 874 won out. I ordered a pair locally and they've arrived today.
On to my question - I'm not hoping for a drop-in replacement for the old crossovers for the PeeCreek and there are a number of differences between the old driver and the new. I'm getting familiar with PCD again and seem to have worked out a few annoyances (it was built for Excel 2007 after all). However, after tweaking a design and thinking I was the smartest guy ever, I realised I hadn't input any phase data for the drivers.
I went back to Response Modeller and after several attempts, managed to get what I think was an accurate phase curve to import back into PCD.
And then my beautiful response curve fell completely apart...
So here's the question: Is there an accurate source for phase data for a given driver? Furthermore, is there any magic to phase data or can it be determined purely on the FR of a given .frd file? Or .zma for that matter? I'm definitely stumped.
Oh, and if this is the wrong place, please let me know so I can flag it with a mod.
Cheers,
Michael
But, that's not what my question is about. I have some surpless North Creek Music Systems D25 1" matched tweeters that I'd like to use, very much like Wayne's "PeeCreek" project. Only, since the 850122 wid-woofer is long gone, I've looked into some alternatives.
My best, closest match was the Peerless 830874. I could have gone with the 830883 but hated the silver frame and questionable performance benefit for the price, or even the Nomex version 830875. In the end, the price/performance ratio of the 874 won out. I ordered a pair locally and they've arrived today.
On to my question - I'm not hoping for a drop-in replacement for the old crossovers for the PeeCreek and there are a number of differences between the old driver and the new. I'm getting familiar with PCD again and seem to have worked out a few annoyances (it was built for Excel 2007 after all). However, after tweaking a design and thinking I was the smartest guy ever, I realised I hadn't input any phase data for the drivers.
I went back to Response Modeller and after several attempts, managed to get what I think was an accurate phase curve to import back into PCD.
And then my beautiful response curve fell completely apart...
So here's the question: Is there an accurate source for phase data for a given driver? Furthermore, is there any magic to phase data or can it be determined purely on the FR of a given .frd file? Or .zma for that matter? I'm definitely stumped.
Oh, and if this is the wrong place, please let me know so I can flag it with a mod.
Cheers,
Michael