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Project: the best PA tops using commonly available components
Project: the best PA tops using commonly available components
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Old 26th February 2017, 03:48 AM   #51
djtimmy77 is offline djtimmy77
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Join Date: Aug 2015
Chris, thanks for the additional input. Increasing the input voltage produced the plots I was expecting to see....a smaller bump above the tuning frequency.

I think I am going to shoot for an enclosure with internal dimensions of 15 X 20 X 12 with tuning of 40Hz. 3" port should be enough to keep any chuffing at bay. There is a slight falling response down to 40. I am thinking keeping the phase change well below the xover frequency when using it with the sub is a good thing. Also I think I'll likely use them more frequently without the sub but that remains to be seen. Also, I think the SPL with this configuration is acceptable, so I don't think I am going to go after dual tuning.

I would be cutting the wood this weekend however I have houseguests....so if there are other things I need to consider that would push the tuning freq up let me know.
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Old 28th February 2017, 06:23 PM   #52
djtimmy77 is offline djtimmy77
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I have cut l the panels along with the holes for the speakers and port on the front face. I will be assembling them this week. Should be able to do some testing with them soon!
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Old 13th March 2017, 07:25 PM   #53
djtimmy77 is offline djtimmy77
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The sub is basically done along with one of the tops. Have briefly played around with it in the garage. Sounds decent together but need more time for a proper assessment. Can't crank it much as I don't want to annoy my neighbors.
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Old 15th March 2017, 07:25 PM   #54
djtimmy77 is offline djtimmy77
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The second top was assembled last night. Just a few minor cosmetic tweaks left.
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Old 26th March 2017, 12:36 PM   #55
djtimmy77 is offline djtimmy77
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Was borderline unhappy with the Dayton PA310-8 there was a few resonances that just made it sound off. I figured it might be the enclosure so I got some acoustical foam panels from amazon and lined the inside of the enclosure. Much happier with the sound. I do have to add quite a bit of boost to the low end to use the speakers without the sub. Also I resigned myself to using the ugly waffle grilles as they are off the shelf and inexpensive.
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Last edited by djtimmy77; 26th March 2017 at 12:52 PM.
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Old 24th December 2017, 11:04 PM   #56
Soldermizer is offline Soldermizer  United States
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Default (Almost) zero-cost tweaks...

I'm a fan of two tweaks one can do to a horn or waveguide that * may * improve its performance:

1. the "towel trick" = a lip at the mouth of the horn intended to break up the reflections that can cause "horn honk" or other bad sound.

2. the Geddes foam plug: either the "recommended" 30 PPI reticulated foam (expensive) or my "ghetto" version -- polyfill or similar batting . This is supposed to reduce "higher order modes."

Many claim either or both these tweaks can dramatically improve a horn's sound -- at a cost of slight HF reduction. Unless you need to melt the ear wax in your listeners' ears, you should be able add a little HF boost to compensate.

Other than appearance issues, may I point out both these tweaks cost almost nothing to try?
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