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In Reply to: RE: Decoupling Speakers - Springs vs. Herbie's posted by mitch2 on September 14, 2020 at 14:07:33
It seems I am having no luck finding others here who are using springs for decoupling.
After finding springs with the appropriate stiffness and capacity, I encased each spring in heatshrink, which seems to dampen the rebound, and then put a couple of holes in the heatshrink to allow air to escape so the springs can work properly. This is similar to what Townshend has done with their pods. The heatshrink wraps over the tops and bottoms of the springs, which prevents the springs from scratching equipment or the underlying support platforms. They look like this.....
The two holes are visible in the spring on the left.
Follow Ups:
Metal is perhaps a BETTER transmitter of vibration energy than the cabinet material itself. If there are any, again, viscoelastic end caps THAT'S buffering your energy.
nice work! what are your before and after vibration measurements?
be well,
Ok, now that I have added the "Vibration Analysis" app to my iPhone, I need to decide what specific signal to be used to compare vibration readings for different speaker footers - springs, Herbie's, and spikes. Any suggestions?
probably the speaker cabinet resonance vs. the floor in close proximity
or scope out the link for some ideas on determining isolation boundaries
with regards,
His DIY 705 reminds me of the EVP pads everyone raves about. I suspected those might be Owens Corning 705 with a piece of sheet steel on each end and sandwiched between rubber. I would like to try them.
If I were to DIY EVPs, I might use a slice of thin carbon fiber on each end of the 705 sandwiched between a thin, flat section of 70 duro sorbothane. The EVPs needed for my heavy speakers are about $105 each.
Have not taken measurements yet but they sound good. The heatshrink noticeably damped the rebound so there are less oscillations after they are manually excited by pushing on them. The heatshrink also improves the visual appearance. The holes were necessary to prevent an air lock inside of the springs.
they look good and it's innovative
looking forward to your follow up on measurements
regards,
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