Hi - is there an easy way to measure Fs of a ribbon transducer? Backstory : I have repaired a MRTW array from an Apogee Scintilla for fun (OEM ribbons with a bit more stretch) and will be disconnecting the common ground from the Mid to the Tw to possibly run them active but want to find the Fs of these two transducers. Or maybe someone already knows what it would be "close enough". I'm wanting to know a good place to start when creating a crossover, frequency-wise. I've read over historical threads on this and I've seen lots of frequencies tossed around. Mid will be a 12 or 24dB bandpass Tw will be HP obviously. With a steeper slope I can run the mid a bit lower, right? Maybe my old pal Carlton will see this and reply. @Carlton8000 @lowmass @AVWERK
Most of the time it's extremely low.
You can do it with a mic and a very low volume and measure it.
But be careful.
You can do it with a mic and a very low volume and measure it.
But be careful.
Ok pal I've got my microphone in one hand and a measuring tape in the other now what? kidding aside maybe a tiny bit more hand holding ha ha ha
I would approach it by measuring the impedance with REW and the corresponding setup with ADC-DAC
Here is a hint to what to look for, as the peaks/dips are very small on these: https://www.diyaudio.com/community/threads/anyone-making-apogee-bass-panels.140156/post-7040572
I have been doing resonance tuning on the woofer panel (Apogee service procedure), with a microphone and quickly found that the low directivity of my microphone made it far from appropiate for that job ;-)
I did not try the method on the tweeters.
At the end of the day, you would not use this for the filter settings as the Fs are so low. But it is a good control on tension/mass - unless you have that aligned 100% mechanically by a tensiometer.
You would rather look into, at what volumes and frequencies, the units simply start to leave the gap, creating nonlinearities and also causing doubler effects.
You might also have found this webpage with further insights: https://www.lippaudio.org/old/MySystems/Scintilla/
Here is a hint to what to look for, as the peaks/dips are very small on these: https://www.diyaudio.com/community/threads/anyone-making-apogee-bass-panels.140156/post-7040572
I have been doing resonance tuning on the woofer panel (Apogee service procedure), with a microphone and quickly found that the low directivity of my microphone made it far from appropiate for that job ;-)
I did not try the method on the tweeters.
At the end of the day, you would not use this for the filter settings as the Fs are so low. But it is a good control on tension/mass - unless you have that aligned 100% mechanically by a tensiometer.
You would rather look into, at what volumes and frequencies, the units simply start to leave the gap, creating nonlinearities and also causing doubler effects.
You might also have found this webpage with further insights: https://www.lippaudio.org/old/MySystems/Scintilla/
