A couple years ago I built an end firing TH that ended up tuned a bit lower than I had planned for @ ~28 Hz so I closed up the end and gave it a keystone exit that would still allow the driver to be installed, it got the tuning up to 30.5 Hz and worked out quite well.
28Hz end fire TH
Hi there D: Questions: what was the Fs for the driver and was there any partial end closure on the TH? This looks like a smallish TH that would work well for a home system and I'd like to use your folding for a similar 27 or 28 Hz TH that I'll simulate for a different driver.
...regards, Michael
A couple years ago I built an end firing TH that ended up tuned a bit lower than I had planned for @ ~28 Hz,
so I closed up the end and gave it a keystone exit that would still allow the driver to be installed, it got the tuning up to 30.5 Hz and worked out quite well.
Hi there D: Questions: what was the Fs for the driver and was there any partial end closure on the TH? This looks like a smallish TH that would work well for a home system and I'd like to use your folding for a similar 27 or 28 Hz TH that I'll simulate for a different driver.
...regards, Michael
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The sound is a bit different, IMO the signature followed with the changes comparatively.
The sound is a bit different, IMO the signature followed with the changes comparatively.
It's a 15" car audio with driver relatively high FS (@39 Hz)and comparative horsepower to the 18SW115-4. Unfortunately it looks like the driver has been changed so I'd have to withhold my recommendation unless I can get one to measure. This was cooked up specifically for outdoor movies/music type duty.
How would you compare the difference(s)?
Which signature do you prefer? And for what reasons (if not already answered)?
15" TH:
The 10 Hz lower FB and small peak at the bottom really lend a Hi-Fi quality to the sound, the lower FB also limits how high you can go with the LPF but the standard 80 Hz AVR LPF is fine with this setup. A good match for a 1kW RMS amp.
TH18
18SW115-4 on the other hand is a monster that will KICK HARD when fed appropriately, imagine standing in front of the box and trying to figure out what's actually moving, your toes, your shoes, or the concrete slab you are standing on - it's 89 octane vs top fuel in the input power department.
I don't have a preference, it's more of a choice of tool or weapon situation. Don't bring a knife to a gunfight.
The 10 Hz lower FB and small peak at the bottom really lend a Hi-Fi quality to the sound, the lower FB also limits how high you can go with the LPF but the standard 80 Hz AVR LPF is fine with this setup. A good match for a 1kW RMS amp.
TH18
18SW115-4 on the other hand is a monster that will KICK HARD when fed appropriately, imagine standing in front of the box and trying to figure out what's actually moving, your toes, your shoes, or the concrete slab you are standing on - it's 89 octane vs top fuel in the input power department.
I don't have a preference, it's more of a choice of tool or weapon situation. Don't bring a knife to a gunfight.
Sorry, just meant the sound signature due to a different folding, SS15/TH18 style vs simpler Keystone style, if you had any two of similar size, output levels and fb to directly compare.
OK, here is a better example then. These two have very similar FB and are very much the same sound while having totally different folds, using the same amount of material - 2 sheets.
Awesome. Are they both THs? One of them looks like it could be a FLH. What is the driver's orientation in the far enclosure? And if they're both THs, are there any notable differences in their sound characteristics?
I'm attempting to gather an idea whether or not a different folding from the same HR info will result a different audial experience. And if the driver facing out (like in the Keystone) adds notable output/tonal differences vs the driver facing more toward the floor, not directly toward the listener.
I'd like to hear your (and others') opinions from real world experience(s).
I'm attempting to gather an idea whether or not a different folding from the same HR info will result a different audial experience. And if the driver facing out (like in the Keystone) adds notable output/tonal differences vs the driver facing more toward the floor, not directly toward the listener.
I'd like to hear your (and others') opinions from real world experience(s).
I think the sound correlates with the measurements, if the folds closely follow the model and the measurements also corroborate the sound will be the same. That said the fold will definitely influence the measurements, impedance measurements in particular are a great diagnostic tool IMO. This is the human equivalent of a dog chasing it's tail.🙄
It's a TH too, here's the intent, a 6' tall stack of FUN:
It's a TH too, here's the intent, a 6' tall stack of FUN:
So I guess this is it? The keystone sub!?
Ok, the attachment jumps off, but it's on page 49🙂
Ok, the attachment jumps off, but it's on page 49🙂
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It's a TH too, here's the intent, a 6' tall stack of FUN:
That stack looks WICKED!
What design is that?
I'm just doing a 21" version of the keystone sub, it's a bit deeper, with a little less compression ratio to save the cone.
I'm just doing a 21" version of the keystone sub, it's a bit deeper, with a little less compression ratio to save the cone.
Yes, curious too. 6'=72"/4=18" slim cabinet. Must be for a 15 or 12. I dig the length, maybe 54 or 60"? Slimmer but longer should go lower as path length is longer right? Hopefully it's a single sheet, 100db 30hz F3, $200 driver cab 😀
A TH18, weapons grade sub
NEO Dan...TH18 18SW115-4 on the other hand is a monster that will KICK HARD when fed appropriately said: