Page 1 of 1
Messin' Around in the Lab
Posted: Tue Feb 20, 2018 8:49 pm
by donniej
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
https://youtu.be/8LvpemPxels
Re: Messin' Around in the Lab
Posted: Wed Feb 21, 2018 11:14 am
by startgroove
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
Re: Messin' Around in the Lab
Posted: Wed Feb 21, 2018 1:46 pm
by donniej
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...