If you are worried about subliminal influence think about this:
At any given public location, there are several conversations around you that are out of your conscious awareness. That is, they are subliminal.
Think of how much information has gone in this way and how you have always behaved normally. Just because someone was having a conversation about hamburgers just out of earshot doesn't mean you had to compulsively go out and eat hamburgers.
You've managed sub-threshold information your whole life. It isn't any big deal. You may have picked out something someone said out or earshot that had importance to you in some way and responded to it as you saw fit.
Information is out there not as a means to form your being and control your behavior, rather it is something out there for you to gather and use or discard.
Advertisers and marketers are more effective and subtle at controlling your behaviors than hemi-sync or subliminal or even hypnosis tapes ... and even then you still have choice.
