Quack System Upgrades

I built some DIY HFT resonators using ozzy’s recipe (copper fly fishing cones inside of 1/8" copper plumbing end caps). Total cost was something like $20. They definitely effect the sound in my room. Pretty powerful actually. Easy to overdo it and the mid-treble gets hard sounding IME.

I also heard the SR ART system in several settings. I like the effect but just too expensive to me, not to say that others haven’t gotten great results they feel to be worth the money.

Also heard good benefits from Helmholz resonators between and behind Apogees.

Then there are the Schumann resonance generators...heard good things from friends but concerned about health effects.

Dave

 
dlcockrum wrote,

"I built some DIY HFT resonators using ozzy’s recipe (copper fly fishing cones inside of 1/8" copper plumbing end caps). Total cost was something like $20. They definitely effect the sound in my room. Pretty powerful actually. Easy to overdo it and the mid-treble gets hard sounding IME."

My resonators and most others like Ziplex and ART and Franck Chang's have bowl diameter of 7/8" or 1" just for reference. Now, one interesting thing about these resonators is that they actually work in two ways. One is acoustic, since the diameter of the bowl is the same as some acoustic wave wavelength. The diameter also happens to be the wavelength of some radio frequency (I.e., electromagnetic wave). Which is why placing resonators in other rooms improves the sound. The other Chang resonators, Sugar Cubes have a very small hole, maybe 1/8" diameter.

dlcockrum wrote,

"I also heard the SR ART system in several settings. I like the effect but just too expensive to me, not to say that others haven’t gotten great results they feel to be worth the money."

If you think the ARTs are expensive check out the platinum and gold Acoustic Resonators from Franck Chang.

dlcockrum wrote,

"Also heard good benefits from Helmholz resonators between and behind Apogees."

Of course the orginal Argent Room Lens is a Helmholtz resonator. So is an empty coke bottle. I built a Helmholtz resonator to deal with a 70 Hz standing wave. The resonator was a 15' long folded horn with a nozzle on one end and sealed on the other end.

dlcockrum wrote,

"Then there are the Schumann resonance generators...heard good things from friends but concerned about health effects."

I immediately like the whole idea of Schumann frequency generators, but never owned one. Well, I did set up a portable CD player and small speakers so I could play a Schumann frequency CD. Would you believe very small speakers can produce a 7.8 Hz frequency in the room? 😀

dlcockrum wrote,

"I built some DIY HFT resonators using ozzy’s recipe (copper fly fishing cones inside of 1/8" copper plumbing end caps). Total cost was something like $20. They definitely effect the sound in my room. Pretty powerful actually. Easy to overdo it and the mid-treble gets hard sounding IME."

Geez, I almost forgot the most important thing. The trick with these resonators is finding places in the room where they do good, not do bad. There are many places where they can hurt the sound. Like the empty beer bottles in the big rooms at CES. 😬

If you have an SPL meter handy you can map out all the pressure peaks in the room and attack the highest dB peaks first. If you don’t have a SPL meter handy it’s a lot of trial and error but the best places to start are proximity to room corners, especially upper room corners. Other places to start are 1st reflection points, the wall behind the listener and between the speakers on the front wall. Height is an issue with around 5 feet being a good starting point.

geoffkait wrote,

"Geez, I almost forgot the most important thing. The trick with these resonators is finding places in the room where they do good, not do bad. If you have a SPL meter handy you can map out all the pressure peaks in the room and attack the highest dB peaks first. If you don't have a SPL meter handy it's a little trial and error but the best places to start are proximity to room corners, especially upper room corners. Other places to start are 1st reflection points, the wall behind the listener and between the speakers on the front wall. Height is an issue with around 5 feet being a good starting point."

Rather than using a SPL meter or the "blind mice" approach suggested by geoffkait, I have achieved better results in placing my resonators by hiring a dowser specializing in audio resonances. For you DIYers, he mentioned that he built his divining rod using instructions found on you tube.

jitter wrote,

"Rather than using a SPL meter or the "blind mice" approach suggested by geoffkait, I have achieved better results in placing my resonators by hiring a dowser specializing in audio resonances. For you DIYers, he mentioned that he built his divining rod using instructions found on you tube."

when you get a moment I have an excellent suggestion for where to put your resonators. 

Geoff said:
"when you get a moment I have an excellent suggestion for where to put your resonators"

Perhaps, but you'd have to remove your head first. 

Actually, I was going to say something but as you can see above I deleted it.  I just think Geoff is in an uncharacteristically bad mood today.  Hope your feeling better, all of this is just our normal banter back and forth as far as I know.

Self restraint is admirable jetter. However, bad mood or not, you pay when you decide to play. But carving Geoff isn't a particularly challenging endeavor.