Voigt Pipe as a resonator? Deep insight into cabinet design
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- เผยแพร่เมื่อ 11 ก.ย. 2024
- Contrasting standard cabinets & Voigt pipes. What is going on, how is it handled, and what is your goal? Laying down the roadworks.
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Very interesting to hear the philosophy behind the design of Mark's drivers.
Amazing work.
I just bought a pair of CHR-120s.
These will go in a series of inclosures, until i find which sounds best.
Open baffle, sealed box, Voigt pipe and BIB.
But not a ported box... Too fluffy sounding.
Older jazz recordings, where some instruments are separated (completely or partially) on the left or right channel, by changing the channel inputs to the amplifier, revealed significant differences between FVP (folded Voigt pipe) and VP. The FVPs appear to be slightly livelier, but also less balanced, with more problems with certain tones and harmonies and more audible driver distortions at the same loads. Also, the FVP cabinet shows more resonances. This is especially present in the upper area of the cabinet, around the driver. It's true that some resonances are pleasant, but unfortunately they also stick out tonally too much.
Changes in damping have a smaller impact than desired. Additional reinforcement - thickening of the sides silences these resonances, but then the sound is just not right, and the problem of driver distortion when under load cannot be solved. there are fewer problems with VP, or they are virtually non-existent.
Based on the above, I concluded that the very placement of the drivers in the upper closed part of the cabinet causes these problems due to too much released energy, which the cabinet is unable to release due to the very shape and position of the driver, which results in problems.
Therefore, I very much agree with what was stated in this article - video, that VPs are probably the only ones that ensure the operation of the speaker without (or far less) certain problems, which are characteristic especially of bass reflex and closed designs. Therefore, drivers of classic softer materials and more natural sound (paper bases) will generally have problems with certain loads in such designs. That is why the tendency of driver manufacturers is to use ever harder diaphragm materials, which does not mean that the problems are solved in the classic box. I also think that this is a logical problem for full-range drivers, which are already quite loaded and additional feedback energy - the load from the cabinet significantly affects the quality of the presentation.
I don't know much about horn speakers, I have no experience with building them, but for now, after several months of experiments, it will probably hold that VP are the most optimal and simplest design for maximum efficiency and minimum distortions and overall problems.
Learning from the new content of the past three days
🙏🙏🙏
Thank you 😊 greatly appreciated! I really value you going in to the other aspects of cabinet resonance as well. Hope you have good day
Reminds me of the Bose sound cannon.
Thanks for another interesting discussion, Janos and Kintaro. Since heat is related to the Brownian motion of molecules does it follow that damping materials are actually changing the frequency of the left over signal? Thanks, my friend!
Dampening .............your obsdervations are correct .
Another issue with damping is that' dampening is NOT uniform to variable sound pessure levels ( music equals dynamics) and damping is not uniform troughout the frequency range......
Also in a town the noise floor is HIGH but composed by countless noise sources, vehicules , human activity a quite nd reflections between buildings...etc , you get used to it and it becomes the reference .....but in a rural environment that is rather very the silent disturbed by the the passing of a single little motorcycle is an almost painfull experience.
Have a sunny day Janos.
Do you think there is any merit making an analogy between sound and a random-dot stereogram (a 2D-image composed of random dots that when viewed correctly will mentally produce a 3D-image)? I was thinking that sound:music :: RDS:3D-image. As is the case with RDSs, a fragile mental state can be obtained where the 3D-image is perceived. Similarly, music can be perceived in a fragile mental state when listening to sound. Extending the analogy further, as adding color to a RSD can ease the perception of 3D, perhaps tonality aids in perceiving music from sound.