What evidence is there that we hear Ultra Sonic audio?

[b3lieve]

Is it okay to listen to the subs in mp3 format? LOL

If not what format should be used?

flac is the best. it retains everything with no compromise. with that said, others have explained with understanding that mp3 doesn't remove or damage what is needed for these subliminals to work effectively.

[Shannon]

FLAC is not a universally useful format. There are few to no "FLAC players". You won't find many car CD players that can handle FLAC. Throwing a CD in a DVR or DVD player with FLAC won't usually do much. Etc.

But a properly prepared mp3 is just fine. There is very little difference in audio quality from my mp3's and FLAC for all practical intents and purposes. The FLAC would have the same results, just a bigger file.

[Shannon]

There's nothing wrong with MP3 format itself as long as the proper care was taken in the files' preparation. Certainly it is safe. Worst possible case is that a particular file was down sampled into harmless static. Not impossible, mind you, but highly improbable.

I have found that mp3 default settings on a lot of compressors destroy ultrasonic audio or severely damage it. That's usually set for 128k.

[Fizbin]

I have found that mp3 default settings on a lot of compressors destroy ultrasonic audio or severely damage it. That's usually set for 128k.

Well, there's a difference between the playback rate and the tool's internal processing sample rate. For example, in Audacity, you can set an internal sample rate way too low (and I think the default is 22k), so yes, as I said, you have to be mindful when you are working with ultrasonics to make sure your whole workflow is set to handle the frequency distribution. BUT that's not MP3's fault, which is what the original question was about...

[b3lieve]

FLAC is not a universally useful format. There are few to no "FLAC players". You won't find many car CD players that can handle FLAC. Throwing a CD in a DVR or DVD player with FLAC won't usually do much. Etc.

But a properly prepared mp3 is just fine. There is very little difference in audio quality from my mp3's and FLAC for all practical intents and purposes. The FLAC would have the same results, just a bigger file.

well flac is just another lossless codec anyone can convert to their liking. m4a lossless is 100% compatible across apple devices for example. however, as you've explained the way you do your authoring has no loss so i'm happy to leave it at that.

[Sean]

well flac is just another lossless codec anyone can convert to their liking. m4a lossless is 100% compatible across apple devices for example. however, as you've explained the way you do your authoring has no loss so i'm happy to leave it at that.

Unfortunately, not just anyone can re-encode or convert audio files, because most people don't know how. Were Shannon to distribute on FLAC, many customers would be requesting assistance or refunds because the files came in a format they can't use natively.

My ex-girlfriend, for instance, would probably love some of these subliminals (but resist using them if I suggested it), but wouldn't know what to do with a FLAC file because she can't just import it into iTunes and go on her merry way.

I *LOVE* FLAC files for encoding music for my devices, but I wouldn't give one to my mom.