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John Curl's Blowtorch preamplifier part III
John Curl's Blowtorch preamplifier part III
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Old Today, 02:26 AM   #12781
john curl is offline john curl  United States
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Richard, I must have missed what distortion your inexpensive mike has at lower, but usable operating levels. What do you expect at 80spl? Or any other near amplitude?
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Old Today, 02:53 AM   #12782
Max Headroom is offline Max Headroom  Australia
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JBL Eon 15 G2 Recone Kit 2 Ohm


jbl.JPG


I have not investigated JBL Eon magnet assy, maybe some food for thought ?.


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Old Today, 02:49 PM   #12783
scott wurcer is offline scott wurcer  United States
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Quote:
Originally Posted by john curl View Post
Richard, I must have missed what distortion your inexpensive mike has at lower, but usable operating levels. What do you expect at 80spl? Or any other near amplitude?
Very interesting thanks! The Sennheiser might have a symmetrical capsule but they use an FM detector which I remember as being very hard to tune up to stay at -80dB consistently. IIRC the Foster-Seely and ratio detectors both have dominant seconds when tuned off center a little.
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Old Today, 03:11 PM   #12784
RNMarsh is offline RNMarsh  United States
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Originally Posted by Max Headroom View Post
JBL Eon 15 G2 Recone Kit 2 Ohm


Attachment 730303


I have not investigated JBL Eon magnet assy, maybe some food for thought ?.


Dan.
Oh. Yes, recone/repair kits. That would make it a lot easier to modify and change VC windings etc.


THx - Richard
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Old Today, 03:17 PM   #12785
RNMarsh is offline RNMarsh  United States
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Originally Posted by john curl View Post
Richard, I must have missed what distortion your inexpensive mike has at lower, but usable operating levels. What do you expect at 80spl? Or any other near amplitude?
I will put some of them up - only electrets --- the typical THD ranges from -60 to -80dB on these three.... Plenty good enough for dynamic speaker driver measurements. I have others also -- some with very flat FR.
I ordered OM1 Line Audio for its low THD and high SPL: 133db at 0.5% THD.

Over-all, these mic types are fine. And many come with correction files for FR.

They are a suitable choice for DIY tests and are low cost, too.


Figure-7.-Sample-distortion-plot-for-M30-and-Dayton-EMM-6.png

omnimicv2_8.jpg

schematic-6-loopback.jpg




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Old Today, 03:31 PM   #12786
Max Headroom is offline Max Headroom  Australia
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Oh. Yes, recone/repair kits. That would make it a lot easier to modify and change VC windings etc.


THx - Richard
Yes. That company and others (one was referenced here) can supply all the bits to build drivers from scratch, and economically.
Winding bespoke VC assy's then coupled (glued) to off the shelf cones and surrounds and baskets looks like ripe for experiment.
I expect there are DIY speaker driver forums that are catered for by the above kinds of suppliers....there might be some good experience there.


Dan.
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