Thank you for the in-depth response! Sorry for the late reply.
Either way, you mention a maximum of 2 woofers are allowed by Simshaker so I'm guessing you can balance power to each of the 2 woofers to evoke a stereo type of effect for the "shaking".
If so, that's very cool and makes me wonder if that algorithm could be used for home theater applications also by extracting a left and right subwoofer signal from just 1 subwoofer signal.
I'll have to check out Simshaker some more to find out...pretty cool if that's the case.
I’m not knowleagable enough unfortunately to know about what is possible or not, as far as getting it to work for a home theater, outside of DCS or racing games. I was going to delve into it further
once I decided upon a design for the rig, which will be DIY yes. What got me interested in using transducers was a video made by Roland van Roy showing how his flight sim rig reacted to a transducer he had installed on it.
It’s an old video and entry (search for bff_shaker_system - on simprojects.nl). But it got me intrigued. He stated that: “The final result is pretty awesome, and I really believe the vibration system outperforms the motion platform.”
The way he mounted the transducer here might give you some additional ideas. At least for flight sims it seems to be especially effective.
Anyway, for your 2 driver simulator platform, I'm presuming it's a variation of the open baffle mini-riser BOSS design as I drew in post 29. If so, the open baffle configuration allows the drivers to reach into single digit frequencies
with very low power while delivering incredible single digit shaking to the butt that will feel so incredibly natural....perfect for a flight simulator.
Sounds great! Just what I was looking for!
I’m thinking of building a rig out of 40mm I aluminium profiles used by sim-lab or monstertech. Thought I don’t really know how good of a choice this is to get max. effectiveness from the JBL’s. Harwood or metal or best I guess.
And also, there’s so much info out there on isolation, placement, it’s a bit overwhelming, with endless possibilities, configurations. Great guidelines btw in your post 29. And in the newer posts as well. Much to think about.
As for isolation this was something I was also planning to try; please search for ‘Shaky Rig 2: Electric SimVibealoo’ on ISRTV. He has his seat mounted on a platform with springs underneath it. For a video of his rig in action,
search for ‘Shaky Rig #2
with 4x LFEs, Geko GS-105C, AccuForce’ on YT. The Springs in question are: “VMC Group BE-1C, available from McMaster-Carr as "Spring-Action High-Deflection Bolt-Down Vibration-Damping Mounts".
I'm currently using 250-pound springs in the front, left, and right; and a 150-pound spring in the back.”
Maybe it turns out to be more of a gimmick, not producing the result I was hoping for, but it might be nice for the DCS Huey module. On startup, the Huey starts to wobble as the rotor’s begin to spin.
(maybe something that is achievable with two transducers in stereo, don’t know if this works in simshaker though). As the rpm increases, the frequency goes up and the wobble subsides, turning into a more steady, finer vibration.
What seems nice about the spring approach is that you do get additional movement this way. But Mr. Latte, the go-to transducer expert on one of the simracing forums, doesn’t seem to be fond of this approach; using springs for motion.
Looking at that video again, I don’t think it is doable, and you really need a motion platform. Please see ‘DIY 6DOF Motion Platform - DCS Huey - Oculus Rift’ on YT to see what I mean (min. 2:18). Anyway, just having engine vibrations,
or from the gun, or the skids making contact with the ground, all of that would be awesome, and I know simshaker is capable of this.
I was going to mount one transducer directly underneath the seat (on top of the alu rig on which the seat slider/frame is mounted) or beneath the seat on a hardwood/metal platform, with the alu rig mounted on top of it.
I might use rubber isolators under the hardwood platform (now maybe those “20-40 durometer in softness” like you suggested), or put those springs underneath it. Perhaps it’s could be an idea to mount two JBL’s, one on each side of the rig,
hopefully to get that startup effect. But again, I need to do a lot of reading first. I have no experience whatsoever. Also for simshaker I think you need to have a separate soundcard installed.
A good setup guide can be found on the 476vfightergroup website. Just search for ‘Setting up a Buttkicker (or other transducers)’.
I modeled the JBL S2-1224 and compared it to the baseline BOSS driver you mentioned (CX-1200). The WinISD results are below. Basically, the S2-1224 has 87% of the moving mass (155g vs. 179g) and 85% of the excursion (10.25mm vs. 12mm)
for a shaker potential of .74 that of the baseline BOSS driver. So, 3 of the S2-1224's would equal 2 of the CX-1200's when used on a BOSS platform as outlined in Post 29.
Great info, thanks for the comparison! So I'll buy the 1200’s then.
The NU4-6000 is way too much for just 2 drivers in a BOSS configuration. If you plan to use the 6000, be sure to get the DSP version so that you can limit how much power each subwoofer will get.
The Behringer NX1000/NX3000D seems like a good choice then.