I know some folks have built their own CHEC units.  I have designs for my own (to be built one of these days…) but then I saw the following and it got my hobby-engineering brain going.

I know this technology isn’t exactly new, but I caught an expose of it on the Science Channel TV show, Brink.  This technology seems simple, inexpensive (relatively) and adaptable.  I am not promoting this product, nor am I affiliated with it.  I am a 30 year old dad in the middle of Indiana who happens to watch science shows.

http://www.neurosky.com/ More specifically, http://www.neurosky.com/products/neurosky-mindset-usa/

From what I could discern, this headset basically measures concentration and relaxation with the idea of developing concentration, in this case, mostly affecting video games or programmed visual media.  It also provides a very simple color coded graph of brain wave activity.  

The website notes this in the info about the headset, “With the additional NeuroTech R&D Kit, users can perform their own brainwave research, or develop their own software and hardware applications to interact with, and take advantage of all the MindSet’s capabilities.*1
(*1 System requirements: Windows Vista (preferred), 2.0 GHz Core 2 Duo or Equivalent Processor, 256MB 3D Graphics Card for Games and Demonstrations, 1GB Memory, DirectX 10. )”

I couldn’t help but think how this technology might be hacked to aid in Hemi-Sync research, or even with programs and program participants at TMI.  I also think it’d be great for home use data and experiential verification. If you can record the headset data with a time stamp and correlate that with the timing of the taped exercises of a gateway Voyage CD, you can actually see when you have reached established brain wave activities conducive to non-physical reality experiences.

I’ve wondered how they get accurate readings with only the one electrode arm sticking out over one ear.  Maybe there are additional electrode nodes along the band of the head set and that front one reads the frontal lobe or something?

Building a sound proof booth/bed chamber is not impossible.  It’s even a fairly simple DIY project if you have the $, time, and tools; I’ve looked into it.  Using rolls of commercially available sound proof matting and air pockets between plywood and drywall will effectively offer enough sound proofing for a free standing CHEC unit in your own home or apartment. 

I’ve thought recently of designing a tanning bed inspired CHEC unit that could be placed in a small apartment or moved around in a house.  No need to build huge installed berths that can lower re-sale value.  

I think I’ve read that in the early days of the M5000 program (or at least with the explorers) TMI used to use EEG’s but now they use mostly the galvanic skin response method to measure the participants’ level of deep relaxation.  They may still use the electrodes in the Lab CHEC unit, I don’t know without looking it up. 

Measuring the brainwave levels would probably not be a problem as a measuring/correlation tool so long as you start with the data needed to know which levels of brain waves are inductive of different levels of non-physical awareness.  I bet that info could be had from TMI somehow.

Already looked into that too.  You don't need air-tight (though that is a viable option,) just insulated walls and sound baffled air vents.

I was trying to figure out how to vent/provide oxygen to a really well sealed CHEC when I found an on-line sound store with experts to talk out projects with you.  Of course they wanted to sell me thier stuff, but I learned a lot from him.