Are you hearing those resonances WITH a low pass filter?
If so, then what frequency are you using?
Remember, this a SUBwoofer (<80hz) not a bass bin (>50hz).
I think he's saying there's about 40db gain at those frequencies and the mechanical noise of a woofer could be amplified. A low pass filter won't stop those noises.
You will hear these noises (in multiple very strange ways) regardless of the input signal to the driver…. And the big open mouth( instead of a port) is night and day different if you compare similar tuned subwoofers at the same time.
Bassxreflex or tuned qw tubes sound entirely different and ‘filter’ out a lot of this noise it seems. It s very interesting, and I’m guessing why many people say horns honk or pipes ring or sealed boxes are the only good subwoofers?
I lined mine with fleece blanket and sorta of clogged(damped) up the exit to find a decent compromise in what I was willing to tolerate
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Maybe that type of stuff shows up in the various ways we can measure distortion and decay in REW? I measure and compare a bunch of my stuff this way, and have learned a ton of stuff beyond what my initial ignorant ears thought was happening, but my measurements aren’t calibrated to a certain voltage or out in a field on a ladder, etc so it’s not useful to anything other than comparing my my own junk and discovering what and where these weird sounds come from
I hear the distortion with sealed subs. A driver moves, it distorts. Drivers move more in a sealed enclosures per a given voltage.
We stick transducers in stupid musical instrument shaped resonators in an attempt to get ‘louder’ instead of ‘lower’ and then it’s a bunch of crazy noise it seems?
I have the VERY best luck with tapered qw pipes
I have the VERY best luck with tapered qw pipes
So now put a funky undersized mouth ‘horn’ (a goofy expanding path TL) on the other side of the driver with a funky stamped steel frame or aggressive/noisy cooling shaped frame? and listen to all the funk that’s created?
Until you create a goofy shaped qw resonator that makes its own unwanted noises?
…. It still sucks
…. It still sucks
After reading this thread, I’ve become interested in building one myself to accompany a multiple entry horn I’m planning to build.
I tried a Hornresp simulation with the GAS MAD S1-104, 10", which is currently on sale in Sweden. The response is very similar to the driver in the first post. The driver’s SD isn’t specified, but I used 315, the same value as Circlomanen used in the first post.
I’ll probably adjust the dimensions so the enclosure has the same width as the MEHs. Here is a rough estimate for a 60x80x30 cm box.
I tried a Hornresp simulation with the GAS MAD S1-104, 10", which is currently on sale in Sweden. The response is very similar to the driver in the first post. The driver’s SD isn’t specified, but I used 315, the same value as Circlomanen used in the first post.
I’ll probably adjust the dimensions so the enclosure has the same width as the MEHs. Here is a rough estimate for a 60x80x30 cm box.
The key to low pass filtering the 2nd order distortion more like it? Its distorting, but you can't hear it lol...
This Helmholtz exit thing is fun to play with . It’s like an adjustable sphincter for different fart sounds. I prefer the silent but deadly over the explosive high pitched 😝
This particular version (red) really attenuated the second resonance from the upstream TL . The level wasn’t set as high, sorry
Kinda cool how messing with the exit drags down the other tunings ?
This particular version (red) really attenuated the second resonance from the upstream TL . The level wasn’t set as high, sorry
Kinda cool how messing with the exit drags down the other tunings ?
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I would not recomend this driver. It lacks Bl and xmax. I have heard a large 48x setup with those drivers and they did not impress me at all.
Thanks for the input. Do you have any driver recommendations for a similar build? What BL and Xmax values should I be looking for? The GAS MAD S1-104 has Xmax: 17 mm and Bl: 10.5
Anymore devlopments on these designs? I would love to build something like this but my understanding of hornresp is limited at best and these are complex. Seems difficult to get all compromises within reason. I modeled a dayton kraken yesterday in the 21" model you posted and the group delay was absolutely insane. Like over 100ms irrc. Still, i find merit in this.