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 Post subject: Messin' Around in the Lab
PostPosted: Tue Feb 20, 2018 9:49 pm 
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Victor III
Joined: Thu May 26, 2016 3:46 pm
Posts: 514
Location: Philadelphia, PA
Testing the frequency responses of a cutting head and a reproducer. I don't get to post much in the machines section, so this seemed like a fun opportunity 8-)

https://youtu.be/8LvpemPxels
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 Post subject: Re: Messin' Around in the Lab
PostPosted: Wed Feb 21, 2018 12:14 pm 
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Victor II
Joined: Sat Apr 20, 2013 3:01 pm
Posts: 430
Location: Coos Bay, Oregon
Greetings! I find this interesting since I have been doing experiments in testing frequencies and resonance of horns recently. The You Tube video shows a setup which is not as direct as I am using, but still has possibilities as a test jig (I am driving a small speaker into various horns. That speaker is powered by an amplifier and 10 band equalizer). The set-up shown in the video appears to show a direct connection between the cutting head and reproducer, without a means of pivoting. I wonder if that would suppress some ranges of sound, or am I missing something? Anyway, are you using some equipment to read volume, or frequency, or other parameters? If so, what are they. Thank you for posting this interesting topic. Russie


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 Post subject: Re: Messin' Around in the Lab
PostPosted: Wed Feb 21, 2018 2:46 pm 
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Victor III
Joined: Thu May 26, 2016 3:46 pm
Posts: 514
Location: Philadelphia, PA
The cutting head is attached to the reproducer by what is essentially a long needle. I machined a teflon ring to attach the reproducer to the horn (I just happen to have a lot of PTFE). The goal was to test what EQ "curve" (if that's the correct term) to use when cutting a 78 for acoustic playback with the best possible sound quality.

Out research probably has a bit of overlap and I'd be happy to share details with you. I'll send you a PM...
The Berliner Archive Project:
Lend me your Berliners to be molded and get your originals back plus free copies!
See the current status here = http://forum.talkingmachine.info/viewtopic.php?f=3&t=32545


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