John
How is this coming, will you have it for MWAF?
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Synergy horn build
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Horn response models for the GRS 4FR mid and DCS165 woofers. The roll off on the woofer does not represent a ported enclosure. The key here is to make sure the modeled construction of the driver ports into the horn provide enough overlap for the x-o.
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Chuck, I'll check the construction. The best measured tweeters have a phase plug or deflector that change the wave shape to reduce the destructive interference in the 8K to 11K range. The XT25 and the RS28A measured the best.
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The F might actually be a bit better John. It's natural top end rise can help offset the natural drop from the horn loading.
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The plan is for a 3-way. Tweeter is the RS28A (I mistakenly ordered the F) I'll post some of the measurements tomorrow. The mid is the GRS 4FR-8, but I'm a bit concerned with the sensitivity as the published specs don't match a 91 dB sensitivity. The woofers are the DCS165-4 subwoofers a pair per side.
With the offset loading horn loading of the mid and woofer it's pretty tough to do a 2-way unless you use a small full range driver as the tweeter.
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I once saw a rather clever implementation using Aura NSW2s for midrange. At $10 each, it'd probably get you down to 500hz.
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Is the plan for this to be a two way? I know Tom Danley did a three way horn using 5" closed back mids. Not sure why though.
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I couldn't tell you the first thing about Synergy horns, but I know Bill Waslo has put a lot of information up on the DIYAudio forum.
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Hey John, looks interesting. I'll be excited to watch this one progress and learn from you!
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Synergy horn build
For my last design team build I've decided to do a Synergy horn build. There are some technical challenges so this build could go on for a while. I'm trying to keep this simple enough to be reproducible.
The design goal (other than to make a Synergy horn), is to design the speaker for home use. As this is for home use at reasonable spl levels, I want to use a conventional tweeter (first challenge). Reasonable SPL levels mean I can also use a single midrange driver (challenge #2).
I'm using Bill Waslo's Synergy horn spreadsheet to get me started. I will not be using the waist banding flare. I'm also using Horn Response to model the offset drivers in the horn.
I've built a foam core board model for tweeter testing and have wrapped the testing up last week, so I've order parts. Attached is the current drawing.Tags: None
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