Get with your friend and test all 4 drivers. From the 4 speakers your friend get a pair and you get a pair. You may need to swap to get the closest matching pairs.
Thanks DT
Thanks DT
10% is for really well QCed and manufactured drivers. I have seen much worse, as much as +/-20%. A mismatched pair can be much higher.
Those numbers suggest the drivers might be best as midTweeters XOed >200 Hz.
dave
I've used it with some success on these and some types of foam. In my locale, it's a controlled substance nowadays, so have to buy it from a pharmacy.
Yes, very common for vintage drivers, I've had some from the '40s that were completely locked up. Still got a 12" out of a '39 RCA console that only outputs a bit of HF.
LOL! 🙂 I remember! Did all sorts of things to loosen them up so we could shrink fit them to our bodies to get that perfect 'peg' leg fit!
GM
The data sheet of the speakers show nice in-box measurements, including impedance plot. You should be able to reproduce this in an alike enclosure with Fc (=port resonance) at 85Hz.
We have already discussed that as a possibility!!!
But, its going to take a while to get sorted as he has not begun to break in his.
And this is showing me it takes some time!
However, he built an enclosure based on the Tannoy enclosure already, so its kin of a mute point for him...