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Multi-Way Conventional loudspeakers with crossovers

Mini-Synergy Horn Experiment
Mini-Synergy Horn Experiment
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Old 4th December 2015, 10:56 PM   #21
Patrick Bateman is offline Patrick Bateman  United States
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Old 5th December 2015, 12:03 AM   #22
natehansen66 is offline natehansen66  United States
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Lol. A post somewhere from Bill Waslo clued me into the process and it kinda clicked from there. Last weekend I tried to get there by using dual channel measurements, looking at the phase and impulse delay on the hf section. I came close but not quite where I wanted to be. This time I flattened the response of the mr and hf section, took a measurement of them together, then tweaked the hpf and lpf as well as delay on the hf until it fell into place. Didn't take much really, but it can be better.
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Old 5th December 2015, 12:29 AM   #23
xrk971 is online now xrk971  United States
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Mini-Synergy Horn Experiment
Quote:
Originally Posted by natehansen66 View Post
I made some changes to the port configuration which I'll detail later. For now here's a new xo I worked up. Acoustically it's at about 1.2khz. It could use some more work but not bad really! I don't have as much overlap on the hf and mr that I thought I'd need but I think that phase looks pretty good for a first crack. Didn't take me long to arrive at that.

I also have some open cell throat plugs made for this wg that I use in my main system. My hope was that the foam might "clean up" some of the reflections from the ports (not that I'm seeing much in the way of reflections) due to the longer distance traveled through the foam vs the main wave. Measurements out to 70 didn't show any change other than the normal attenuation.

I just might drag this thing outside this weekend for some better measurements. Sunday looks like 40's with little to no wind.
Nice !!!
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Old 5th December 2015, 12:54 AM   #24
gedlee is offline gedlee  United States
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Nate - if the polars hold up that well then, yes, that is incredible. Its one thing to get a flat response along any one axis with DSP, but how well does that hold off-axis?
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Old 5th December 2015, 01:19 AM   #25
natehansen66 is offline natehansen66  United States
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I looked at several other axes and the phase held up. Mind you this is done with standard IIR filters......there's no FIR phase correction. Doing the FIR phase correction would be a piece of cake and I don't see why it wouldn't hold up off axis as well.

Edit: the fr, of course, is determined by the wg. The response with the phase I showed is 20deg which is the listening angle I design to be flat. The 0deg still shows the axial hole that starts to go away off axis and there's the "bunching" around 7khz that I don't like.

Last edited by natehansen66; 5th December 2015 at 01:22 AM.
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Old 5th December 2015, 01:41 AM   #26
natehansen66 is offline natehansen66  United States
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I'm still setup for measurements in the basement so I figured I'd get the polar response quick with the new xo......3ms gate.
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File Type: png eoswg synergy fr polar.png (111.8 KB, 517 views)
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Old 5th December 2015, 03:48 PM   #27
weltersys is online now weltersys  United States
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Quote:
Originally Posted by natehansen66 View Post
I'm still setup for measurements in the basement so I figured I'd get the polar response quick with the new xo......3ms gate.
Nate,

The polar response looks very good, what is the horn wall angle and overall horn depth?

I'm curious what SPL can be reached before distortion hits 10% (or so), if it can hit 120+ a pair would make a very nice compact light weight center fill for my SynTripP cabinets.

Art
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Old 5th December 2015, 04:24 PM   #28
gedlee is offline gedlee  United States
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I would certainly play with a design like that if I still did that kind of thing, but retired, I just don't have the energy.
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Old 5th December 2015, 05:54 PM   #29
natehansen66 is offline natehansen66  United States
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Art - it's a 90x60 waveguide that's 8" deep. I can do some measurements at higher drive levels and post the distortion plots, but I can tell you that I doubt my mic can handle 120dB. I'm in town and somebody would call the cops for sure. That said I am interested and I'll look into it after I find my ear plugs.

The limiting factor here is the 1" vc compression driver. As it sits it's -3dB at 1.2khz after cd comp with a 1st order hpf at 1.6khz. Swapping in a more capable cd would be easy. I have some 4552nd in my main system (which is what this wg is actually designed for) but I don't want to pull them out. Actually it wouldn't be easy as far as physically mounting the thing goes. The 4524 I'm using has a plastic throat flange where I can access both sides of the mounting bolt. The current setup is pretty sketchy due to the proximity of the mids. When I go to build a new horn I'll have to either drill counterbored holes inside the horn to mount the cd (then plug the holes) or have a removable cd mount plate that would then mount to the horn.
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Old 5th December 2015, 06:21 PM   #30
FredrikC is offline FredrikC  Norway
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Very impressive results Nate!

Looking forward to hearing more about the port details as I'm set on a similar path.

Would be interested in seeing the individual LF and HF output overlayed over the graph you showed earlier to get an idea of how the XO looks.
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