Different conditions I would say.
- Could be the way of coating, but I don't really have a clue at the moment.
That's the same as in the previous picture, the old one and the new one (in the same driver).
- My impression is that the diaphragms (voice coils, etc.) are not that well aligned in their assemblies. Pushing the suspension at one side improves it, while pushing at the other side worsens it further.
The whole diaphragm assembly has a pretty tight fit in the top plate, virtually without any backlash, that's good, but once you don't have the rest perfectly aligned as well, there's obviously a problem. So far it seems that putting pieces of thin shims in the right places might help.
- My impression is that the diaphragms (voice coils, etc.) are not that well aligned in their assemblies. Pushing the suspension at one side improves it, while pushing at the other side worsens it further.
The whole diaphragm assembly has a pretty tight fit in the top plate, virtually without any backlash, that's good, but once you don't have the rest perfectly aligned as well, there's obviously a problem. So far it seems that putting pieces of thin shims in the right places might help.
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1) This means the deviation of the newer from the older is permanently built-in into the diaphragm assembly, which is glued, and cannot be mitigated?
2) fs is still higher with the new one no matter the improved impedance, do I see this correctly?
2) fs is still higher with the new one no matter the improved impedance, do I see this correctly?
Maybe it can be solved with dremel.
Very lightly around the perimeter of diaphragm assembly. Make it less tight fit so it can be centered properly.
Very lightly around the perimeter of diaphragm assembly. Make it less tight fit so it can be centered properly.
I've seen something similar with a compression driver that had a very slight voice coil rub. You might try measuring distortion of the old vs new to see if the new one has elevated high order harmonics. Impedance changing significantly with drive level could be another potential clue.
No easy mitigation that I could see now.
It doesn't necessarily mean that the fs is higher per se. This can be the result of the mechanical problems.
My guess is that the voice coils in these new drivers are indeed out of tolerances and are rubbing. This would need to be confirmed by someone with the capabilities to actually measure all the dimensions mechanically with high accuracy. You can't do this with just calipers.
With the old driver it's virtually impossible to make the coil rub by manipulating it, taking it in and out. It's quite foolproof, the in-built mechanical centering works very well. The new diaphragms are the exact opposite, they must simply by different (defective, I should say, but I have no other data), in some way.
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Could you please do a measurement at higher spl? I checked one of my dfm with a modded Tritonia and at higher levels there was a highly distorted frequency range. Cannot remember where exactly as in this moment I assumed it was just some resonance.....the whole assembly was just placed on the table. I only wanted to investigate where could be a xo with my modded horn. However I will repeat this then....
No time to measure now but could quickly habe a look inside. I can confirm off-center glued dia on this one I tested. Visible by eye with help of the small perforations in the ketone foil. Intentional?....Cannot Imagine that.
Hello !
I started using ath today, and followed the tutorial in the demo1.cfg file.
When importing into AKABAK, the import tool gives me the following error:
ERRORS ------------------------
(12) Script problem at identifier ‘Elements - SD1G0’: Unknown
(16) Script problem at identifier ‘Elements - SD1D1001’: Unknown
(27) Script problem at identifier ‘Infinite_Baffle #3’: Unknown
Problems resolving RefElements=
After trying a corrected abec project on this thread, I get the same error.
Any ideas?
Thank you !
I started using ath today, and followed the tutorial in the demo1.cfg file.
When importing into AKABAK, the import tool gives me the following error:
ERRORS ------------------------
(12) Script problem at identifier ‘Elements - SD1G0’: Unknown
(16) Script problem at identifier ‘Elements - SD1D1001’: Unknown
(27) Script problem at identifier ‘Infinite_Baffle #3’: Unknown
Problems resolving RefElements=
After trying a corrected abec project on this thread, I get the same error.
Any ideas?
Thank you !
Hi,
just measured my 10 drivers. Measurement taken without any horn. CD on a bit soft foam on floor. Mic ~1m vertically away. So many floor reflections.
I applied FDW 15 cycles. SPL is calibrated. Driver positions and angle vary always a few cm. The former measured resonance was not there (so that must have been driver on table or so). All in all the consistency seems to be ok. Do not worry about that HF and LF deviations....this is surely position/distance/.....
just measured my 10 drivers. Measurement taken without any horn. CD on a bit soft foam on floor. Mic ~1m vertically away. So many floor reflections.
I applied FDW 15 cycles. SPL is calibrated. Driver positions and angle vary always a few cm. The former measured resonance was not there (so that must have been driver on table or so). All in all the consistency seems to be ok. Do not worry about that HF and LF deviations....this is surely position/distance/.....
Mine sound okay /good - I've not looked inside them. You can usually hear if something big is off.
Both mine needed the same PEQ tweaks (a good sign).
I can only say you should have the usual EU customer rights in this case too. in any case I would be thankful to see the further documentation of the presumed issue here.
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This still irritates me, but what can we do.
Black is the (big) driver laid on the table, exit facing up.
Blue is the same with A520G2 placed on top of it. It's obviously collecting noise from the outside via the horn...
BTW, if you can still source these old monsters somewhere, don't hesitate a minute. It's a completely different game...
See how clean it is up to 20 kHz, it's hard to believe.
Black is the (big) driver laid on the table, exit facing up.
Blue is the same with A520G2 placed on top of it. It's obviously collecting noise from the outside via the horn...
BTW, if you can still source these old monsters somewhere, don't hesitate a minute. It's a completely different game...
See how clean it is up to 20 kHz, it's hard to believe.
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This is the impedance from the datasheet. Obviously they measured the same thing 🙂
- It's possible that I have it even better centered, as I've spent considerable amount of time with that today (and I think I can say I know how clean pink noise sounds like after this excercise...).
- It's possible that I have it even better centered, as I've spent considerable amount of time with that today (and I think I can say I know how clean pink noise sounds like after this excercise...).