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In the Forum: Horn-Loaded Speakers
In the Thread: Deep End DIY - Australian take one Macondo.
Post Subject: Tuning the hornPosted by anthony on: 4/9/2021
Romy, it is the UB horn that I need to first tune.  Have found an earlier post of yours where you describe your process and will roughly follow it.  First thing though is to measure an impedance sweep of the horn sitting in place to get the base line then play with filling the back-chamber to get the horn resonance frequency equal to the mouth frequency, or thereabouts (reactance annulling).  99cm or 38.5" diameter = 110Hz horn, so I will make sure I start somewhere there.

The paint used for the horns is actually textured/hammered black.  There is a slight metallic hint to the colour which is very black, much blacker than other textured paints that I found, which gives a slight tendency to reflect light.  Certainly not a gloss finish nor even satin but probably somewhere between matte and satin.  The bass cannons and amplifiers (and all my diy equipment) is matte black powdercoating which provides a subtle contrast even though the same colour.

The cheat sheet is a great idea.  Will definitely do one up once it is all set up. 

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