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Frugel-Horn Mk3 Builds & Build Questions
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Old 14th January 2021, 06:55 AM   #1541
nandappe is offline nandappe  Japan
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Join Date: May 2017
My choice , final adjustments.

Minimal sound absorbers.
Dump-duct Area:91cm2(6.5x14cm) , Length:10cm


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My FH mk3 is thunder and storm sounds.
7HD+Frugel Horn - Final adjustment version [ My Final Choice ]---------Damp-Duct (S:91cm2 , L:10cm) - YouTube
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Old 14th January 2021, 11:28 AM   #1542
Scottmoose is offline Scottmoose  United Kingdom
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Quote:
Originally Posted by alsyd View Post
This is really interesting! Can someone please explain the thinking behind a ‘Damp duct’?
He's changed the internal low-pass choke into a duct to lower tuning. While it does achieve that, it also entails some compromises that haven't been mentioned and are somewhat at odds with the design goals, so it's not something I would recommend to others (while acknowledging that it suits nandappe).

The 2KHz aspect is either another minor difference from measurement setup (no criticism implied -you can get such changes through something as simple as different atmospheric conditions), or possibly from adjusting the damping & killing an internal reflection: the enclosure does not operate that high in terms of producing output, and FH3's damping scheme is designed to be user-adjustable.
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Last edited by Scottmoose; 14th January 2021 at 11:31 AM.
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