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Synergy horn build

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  • scottvalentin
    replied
    Those look really good and I still have no idea how they work but nice job!

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  • KEtheredge87
    replied
    Looking good John! Certainly a different approach that we don't see too often. I hope you get to come and bring these to the next InDIYana event! I'd really like to hear them.

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  • jhollander
    replied
    Paint is on. Down to final assembly and testing

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  • jhollander
    replied
    With the prototype done, x-o parts on order, it's time to start putting these together.

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  • mattsk8
    replied
    That's an open invite so if you think you'll be in the area, hit me up!

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  • jhollander
    replied
    I'm in Colorado at that time. I'm all over the next few months. You might like these, f3 is 34hz. MI is on our list. There are several breweries we want to visit there as well.

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  • mattsk8
    replied
    John... what are the odds of you making it to MI on Sept 16?? I would LOVE to hear these

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  • jhollander
    replied
    It took a while to dial this in. I've been listening for the last few days and really like the clarity. It's almost like the open baffle clarity, but subtle. If open baffle gives a open airy sound this is like adding depth. Very similar to nearfield listening. I think there is lower distortion that plays a factor as well as the horn loading cutting off the out of band junk.

    I posted this on another site but wanted to share the XT25 distortion when horn loaded, with and without x-o

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  • jhollander
    replied
    On to x-o design. Attached are the three curves I'm dealing with. First x-o was OK, still needs a bit of tweaking.

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  • jhollander
    replied
    The woofer "box" port is not an issue. The mid and woofer cavity resonances are not in the pass band of the tweeter. Attached are a few pics.

    Sculpting the mid and woofer horn entrances will change the response from the mid and horns. Just based on all the hole changes made yesterday I could not see a response difference I could attribute to different entrance hole thicknesses.

    There are probably some other location changes I could try. I'm at the point where this thing needs to be buildable, so I'm hesitant to go much different. As to moveing items outside the horn, I loose some of the pattern control I'm trying to maintain.

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  • Wolf
    replied
    Just a few thoughts...
    1- could you slot-port out the front sides to remove the port issues?
    2- could you place a pair of side-ways traps flanking the tweeter to eliminate their issues?
    3- would fluid flow/diffraction be an issue for the woofers' cavity resonances? I recall Bill's entry to MWAF one year as having sculpted entries into the horn, and an arcing slot exit right at the horn entrance, and those were almost to the mid-point in the bottom and top horn flare panels whilst being at the extremes in horizontal placement; ei- basically 'at the groove' or 90 degree bend in the horn.

    Of course- I'm just speculating and interested to what you find out...
    Wolf

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  • jhollander
    replied
    The next pics show what happens to the mid response when the woofer holes are covered, reduce by about 1/2 , inside half, outside half, bottom half, top half. Note there are both hole opening size changes and location changes.

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  • jhollander
    replied
    more tests of the mid response comparing multiple holes to one hole near the front edge (of the horn mouth)
    Last edited by jhollander; 02-22-2018, 11:12 AM.

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  • jhollander
    replied
    Spent the day testing and learned a lot. I focused on the dip in the mid range response and what was causing the dip. It appears that the cavity resonance of the woofer is a major factor. The mid frequency response sees the cavity resonance of the woofer which cases the dip in the mid response. The tweeter frequency response sees the cavity resonance of both the woofer and the mid.

    My conclusions are the cavity resonance is a function of the volume between the horn entrance and the driver and the size of the opening into the horn. Much like a port as the opening got smaller (with the same length) the resonance moved lower. As the opening got large the resonance moved higher. As the volume between the driver and the horn entrance became smaller the resonance moved higher. b Multiple smaller woofer openings made no difference (in the midrange dip).

    Additionally there is a factor of where the opening enters the horn. Further from the apex the lower the response dip occurs but the change is much smaller. I'll add notes to pics for those who want to draw their own conclusions over the next few posts. Mid response original over modified
    Last edited by jhollander; 02-22-2018, 11:11 AM.

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  • jhollander
    replied
    Back in post #42 you'll see the woofer port holes are on the same side as the mid range holes. Covering the woofer port holes makes only minor differences in the mid FR. The woofer response looks like it sees the woofer port holes at 450 hz.

    If you follow this, one fix would be to put the mid holes on the same side as the woofer holes. I checked and there's no room on the internal baffle to fit the woofer and the mid.

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