My concern would be the strong resonance at 6 kHz. Its very high Q and likely to be audible.
I have found "harshness" to be mostly a higher frequency effect, which is why the foam is so effective against it. I think it hard to isolate frequency response ranges from types of sources since virtually all of them are in actuality broad band.
Nate,
"Waistbanding", a narrowing response in the lower range of a conical horn (your horn appears conical other than the throat), then widening is due to lack of a secondary expansion flare, your horn has a nice round over but no secondary flare.
The pictures you posted in #3 do not show narrowing in the octave from 1kHz to 2kHz, they show a combined response with the overall picture looking narrower in the 1-5 kHz, then wider, then beaming in the VHF.
So no ideas here other than the above speculation based on photos of the horn and your question.
If you posted a screen shot of the HF horn only showing the response you describe perhaps we can offer more insight.
And watch out for those fiberglass fumes, never met a long term glasser that didn't seem to suffer from brain cell death 😱. Maybe they were just impaired to start with 😉...
Art
Art, post 49 of my waveguide build thread linked in my opening post here shows the contour plot of the wg only. It looks like it may be starting to widen near 1k but you can't tell with the response falling at 900hz.
Other than the throat the main portion of the wg is conical, with a very, very slight curve. I can stick a framing square in the thing and it is quite close to 90°. The wg departs from conical near the round over, curving slightly to the main round over. I'll try to get a good pic.
Other than the throat the main portion of the wg is conical, with a very, very slight curve. I can stick a framing square in the thing and it is quite close to 90°. The wg departs from conical near the round over, curving slightly to the main round over. I'll try to get a good pic.
Ok, but i can only speak in my case and my "harshness" as it is subjective, I find it unlikely that vocals to be "harsh" in the 6kHz range?
Peter
The only thing that vocals are at 6kHz is sibilant, specifically. I guess that's certainly one kind of harsh.
That's it exactly what I'm hearing i would say. There was a dip in the response that was consistent off-axis at 6k that I eq'd with a +3dB q 6 filter. Removing that doesn't seem to help.
I think I'll put together an impedance jig and see what's up there.
One time I tried to trace down some "harshness" that I heard in my speakers on a particular female vocal. I seemed to be getting no where. Then I checked the recording. While this was a first rate singer of some repute, non-the-less, the track was clipping exactly where I heard the problem. I wrote some code to correct the clip and this problem went away.
It can be very difficult to find things like this. I love hearing people jumping to conclusions about what it is. It can be a million things - look everywhere!
It can be very difficult to find things like this. I love hearing people jumping to conclusions about what it is. It can be a million things - look everywhere!
No I didn't put it back on the stand. I did took a gated measurement in-situ to confirm but only on the listening axis. I was thinking I'd retest this weekend.
Good point about the recordings. In all honesty a lot of the stuff I enjoy isn't the greatest quality, and all of my video content is streamed.
Good point about the recordings. In all honesty a lot of the stuff I enjoy isn't the greatest quality, and all of my video content is streamed.
Due to my back my back problems, I can't even jump into conclusions;o)
But thanks to dumptruck, sibilance I can relate to!
Peter
Nice DIY waveguide! Looks a lot like my configuration:🙂
Acoustic Elegance • View topic - LO15 with SEOS-18 CD waveguides
I use AE LO15 instate of TD15M.
Acoustic Elegance • View topic - LO15 with SEOS-18 CD waveguides
I use AE LO15 instate of TD15M.
Jeroenkv - very nice! I think I remember looking at that before. Good choice with the LO15..... That would be my first choice for this app.
I should add that I tried some of the other suggestions offered about my issue with little to no improvement. I'll listen to some more quality recordings and see what happens.
Well, I think the harshness I was hearing is in the recording. I heard some distortion so gross that I thought it HAD to be the speaker. It certainly was out of place. I swapped the signal to the other speaker (what I heard was coming from the left wg) and it had the same effect, like a sudden burst of static at the peak of a build up on the track. I heard the same effect several times throughout the track but nowhere near as bad. Listening on headphones now.......same burst of static at the same spot. Other similar distortions were there as well.
This is a heavy rock recording, so of course there's guitar distortion, but what I'm hearing is nothing like that. Guess I'm getting more sensitive to these things. That, and I'm listening louder than I used to with these new speakers....
This is a heavy rock recording, so of course there's guitar distortion, but what I'm hearing is nothing like that. Guess I'm getting more sensitive to these things. That, and I'm listening louder than I used to with these new speakers....
Really great work! How much LF reduction do you have at 180degrees? And did it take you much fiddling with damping material?
Thanks! If you go to the first link (DSP midrange directivity control) in my opening post I have a full polar plot of the woofer on post #35.
I haven't spent any time optimizing the damping yet.
I haven't spent any time optimizing the damping yet.
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