Originally Posted by Sekosche
Sweet! And that mimics the waveform perfectly; you’re getting some very accurate TR with those seats and the BOSS it looks like.
Has it launched you into space yet? What do you think of it?
This makes me want to try it without the second riser and MA’s setup to see what it feels like and to see if the TR is more consistent across the board with a little more firm seating above the BOSS.
Originally Posted by Rowan611
Nice!! I’ve been meaning to do the same test. I’m curious to see how the riser interacts with the bass from my subs vs BOSS vs Crowsons vs all three together.
Then, I’ll do the same when I get the risers connected.
It really depends on your goals, your room and personal TR preference. Having the BOSS platform as prescribed in Post 29 and executed to that formula like
did will result in an accurate reproduction of the ULF in the original source signal, no matter the source material....music, movies, sine waves square waves, etc.
This accuracy and natural reproduction of ULF is due to the BOSS system behaving in a predictable and linear fashion because of:
1) A very stiff platform that minimizes any bending. When bending occurs, the BOSS will lose linearity and won't be accurate to the source material it's trying to reproduce
2) A homogeneous and soft (20-30 durometer) suspension. Having the same soft isolators underneath the platform is paramount to minimize bending of the platform. The soft suspension allows the platform to behave on command from the drivers directly attached to it. Mixing isolators or having multiple layers of platforms, each with it's own suspension system will also result in non-linearities which take away from accurate representation of the ULF. In the case of having 2 platforms on top of each other, they won't be moving in unison because the second platform isn't directly responding to the drivers below. It has to wait for the drivers force to transfer to it and introduces a time delay to the second platform. In the case of having different isolators underneath 1 platform, this results in different parts of the platform not moving in unison because of the different stiffness isolators underneath. This causes platform bending which counteracts number 1 above.
3) Driver linearities.....I was originally concerned about non-linearities in the drivers themselves. Every driver suspension behaves differently when comparing its stiffness when the cone is moving out vs. its stiffness when the cone is moving in. However, during my tests when comparing the platform responses at several different points at the same time, there wasn't any platform bending occurring that could be attributed to these driver non-linearities. I tried several alignments and there wasn't any net affect on platform bending when trying drivers face up, face down, even opposing which would minimize non-linearities to the fullest. So, as long as the drivers are suitable for open baffle and have good shaker potential, they will work great on a BOSS platform.
4) Passive forcing of the BOSS platform. If you follow number 1 and number 2 above, then the BOSS platform will also respond naturally and linearly to the passive pressure waves washing over it from your far field subs. This enhances the ULF content from the source material as long as those far fields have been properly time aligned using calibration techniques discussed on AVS. If those far field subs aren't time aligned properly with the MLP, then they could destructively interfere with the direct forcing function of the drivers directly mounted to the BOSS platform. Surprisingly, I've found no additional delay is needed for the BOSS and using the same delay as the far fields works great. I think this has to do with the timing of the BOSS system response having a natural delay due to the suspension having to be compressed and uncompressed before it can delivery that theoretical sine wave but I didn't conduct any timing tests to confirm this since the results were surprisingly good out of the gate using no additional delay.
5) Surface area of the BOSS platform. The larger the area of the BOSS platform, the more it will respond passively to your far field subs due to the pressure wave washing over it and your TR will be naturally enhanced with larger surface areas.
All the above is what makes a BOSS system behave linearly and naturally.
has maximized each of these attributes with his design. This may not be for everyone as some may like more TR in certain frequencies or need more or less TR in certain frequencies depending on your room and suspended floor vs. concrete floor.
That's were other TR devices may come in handy, but be aware those other TR devices will change the behavior of your BOSS platform and cause it to behave non-linearly. For example, adding Crowson's on top of a BOSS platform will cause very high localized forces to be applied to the platform right underneath the actuators. This highly localized force will cause your BOSS platform to bend more in that area which causes non-linearities. Placing isolators direclty below the actuators will cause that isolator to become stiffer than it's neighbors because of the localized deflection. Same with BK's and any other TR devices that are attached to the platform.....VNF's, passive radiators, etc. All of these BOSS additions can destructively interfere with each other in addition to causing the BOSS platform to bend un-naturally. So the more TR devices and platforms that are attached to the BOSS foundation, the more trial and error will be needed to find a delay for each that will have all working in unison together. That delay can be electrical delay or mechanical delay through movement of the forces around on the platform and finding the bending moments that work together.
Wow, that's way too much techno-babble for the average BOSS fan, but for those who like to tinker, some of this feedback may help with your own personal BOSS setup and enhancements to you BOSS experience.
While we're talking about BOSS enhancements, for whatever it's worth.....I did a lot of experiments with VNF for about 2 months before the BOSS experiments began. This was my first foray into ULF TR and I was fascinated by how easy it was to induce TR on my body. I found over those 2 months of experimenting that I could never get a consistent VNF experience. As soon as I got it dialed in for optimum feeling for the movie or music I was listening to, the experience would change dramatically when I switched source material. Even with the same source material, the VNF experience would change dramatically just with a change in MV. The only VNF alignment I found that felt somewhat natural and most importantly consistent was with the VNF right in front of me.....literally 8-12" from my chest. This wasn't very practical because I couldn't see the screen but delivered a VNF experience that was pretty cool. Just wanted to mention that for you TR junkies out there who like to experiment. Basically, I placed my VNF on a dinner tray right in front of me. If you haven't tried that yet, you'll be surprised how much of an improvement this makes in the VNF experience....very impractical though.
Anyone want to try a BOSS vest experiment.....how cool would that be for you TR junkies out there who don't have WAF to consider and don't mind strapping up before the movie begins
I can see it now, "Don't mind me honey, I'm just getting ready for my next movie" as the BOSS vest and 3D glasses are being put on before entering the theater