I don't have a carpet, just wood floor. So no spikes, not good for the floor....
Use metal spikes with a suspended timber floor and your loudspeaker will vibrate the floor. Not good.
I don't have a carpet, just wood floor. So no spikes, not good for the floor....
Logically, noise and vibration could therefore affect current flows in those same or similar devices couldn't it?
My thought was simple: build some kind of vibration plate that can resonate easily at a certain frequency. We then measure the audio equipment with the plate running versus not. The resonant frequency of the plate ought to travel into the output of the Audio equipment if there is any issue there.
We can then change that frequency of the vibration plate and see if the measured distortion tracks with it.
This would tell us how sensitive electronics are to highly induced vibrations. If there is no trace of it, then nothing that reduces such vibrations would do any good. But we could deploy some if there are measured effects.
My thought was simple: build some kind of vibration plate that can resonate easily at a certain frequency. We then measure the audio equipment with the plate running versus not. The resonant frequency of the plate ought to travel into the output of the Audio equipment if there is any issue there.
My high tech impulse method is tapping around the case while listening to the output or monitoring it on a scope. Unsurprisingly, this has no effect on engineered (rather than "designed") electronics.
Engineers at Sony, etc; are no more immune to expectation bias than anyone else.I've got many of these TOTL pieces in my (very large) collection. I've studied their construction, design and sheer engineering prowess over the decades.
One can sell a Popsicle stick and easily get a number of people who swear it make their system sound better if they stuck it in the middle of the
Spikes couple to the floor, not decouple. A device decoupling over the whole audio frequency would have a static deflection of nearly 1" under the weight of the item to be decoupled.What about speaker decoupling devices? Are spikes enough or even good?
If the speakers are well designed, the enclosure vibration should be minimal, especially if the 2 woofers are mounted on opposite sides. So, how important are speaker stands?
High-end audio companies do a lot of this today. There is a high-end audio company whose name escapes me now that has every PCB mounted on suspension platform in their power amp!Sony spent a lot of time and money researching this in the 1980s.
No, I was going to use a Piezo sensor.Amir, don't you have something like this in your test kit?
https://en.wikipedia.org/wiki/Laser_Doppler_vibrometer
When I worked at Garrard in 1975/6 we had a R&D engineer working with a very early Laser Doppler device looking at the mode shapes of the complex steel pressings of the inexpensive record decks. Everything was painted matt white iirc and he made some useful mods, I remember him specifying a hole punched into the top plate which changed the mode to substantially reduced the vibration where the arm mounted so anything exciting this particular mode no longer produced an output due to cartridge body moving. The somewhat basic and inexpensive Garrard arms gave substantially less spurious output than the beautifully made SME 3009 Improved contemporary with them.Amir, don't you have something like this in your test kit?
https://en.wikipedia.org/wiki/Laser_Doppler_vibrometer
And teachers mark down accordingly.
He got to go to UQ in grade 2 to receive a $ prize for his acoustic patterns in various liquids and sands. I was so proud, and to his credit, he did do most of it. He used his iPod to drive a small Class D amplifier and speaker he'd torn out of a ghetto blaster- played various test tones (like Daddy) and took pictures of the patterns in the coloured water, sand, rice etc.. All I had to do was glue it all together and print up his 'journal'.
Poor kid, he's grown up listening to test tones- just like I did. As an aside, I can still recite perfectly (with perfect timing) the test record my Dad used in the early 1970s to 'test' his phono setup. I was scarred- or was that imprinted?