Looks good. I don't see a whole lot of ringing in there, but certainly the sound of the speaker side is strongly colored. You can see that in the frequency response. How much that adds to what you hear is difficult to determine without a sophisticated setup. But you can compare what you see now to what you can measure after modifications. You will be able to measure and see any changes you make.
As a sanity check, do a measurement with the speaker disconnected from the amp to see what noises are picked up by the piezo mic with no sound in the speaker. That way we can look for mains hum and other things.
Be sure to make a precise note of where the input volume is now set, along with amp volume and REW settings Maybe take pics, too. You want to be at exactly the same gains if you are going to measure changes.
As a sanity check, do a measurement with the speaker disconnected from the amp to see what noises are picked up by the piezo mic with no sound in the speaker. That way we can look for mains hum and other things.
Be sure to make a precise note of where the input volume is now set, along with amp volume and REW settings Maybe take pics, too. You want to be at exactly the same gains if you are going to measure changes.
Here are some of the problems:
1. electrolytics have to charge up in time and I suppose vary in all kinds of ways in the short- and long-term and prolly with the weather too,
2. hard to properly measure them for the voltages and frequencies of the XO at home or anywhere but in situ - likely best method is by the output of the XO (not that it makes any sense what so ever these days to be anything but bi-amped),
3. just what does "10%" means - does it mean within 10% above or below half the time or 90% or when new or....
4. in practice, makes sense to use a lower number value and then parallel your capacitor to trim it for proper output; if you have some test ability (REW and a bunch of alligator clips is all you need), buy a half-dozen and match pairs of them.
While "1." above may not apply to coils, the other points do. So a whole raft of loosey-goosey problems making passive cross-overs.
B.
1. electrolytics have to charge up in time and I suppose vary in all kinds of ways in the short- and long-term and prolly with the weather too,
2. hard to properly measure them for the voltages and frequencies of the XO at home or anywhere but in situ - likely best method is by the output of the XO (not that it makes any sense what so ever these days to be anything but bi-amped),
3. just what does "10%" means - does it mean within 10% above or below half the time or 90% or when new or....
4. in practice, makes sense to use a lower number value and then parallel your capacitor to trim it for proper output; if you have some test ability (REW and a bunch of alligator clips is all you need), buy a half-dozen and match pairs of them.
While "1." above may not apply to coils, the other points do. So a whole raft of loosey-goosey problems making passive cross-overs.
B.
That's mains electric noise. It's everywhere. Think of the Piezo as a guitar pickup without humbucking coils.
is what sealed?
ah just read
yeah electrolytics are sealed. And it doesn’t take long to charge them either.
most of their charge is stored anyway. Even if you leave them without power going through them.
but they don’t unform that quickly.
and they reform as well.
they aren’t that sensitive as some say.
Not easily, no. It's something you have to be aware of when looking at your piezo measurements.