ASC 5 Generation

[Shannon]

Serris,

One point here. When you are playing two audio sources on the same device, you will have volumetric affects because the waveforms are being combined before they reach the speakers. This will increase the volume of waves that coincide and decrease the volume of waves that negate.

In other words, let's say we have a wave on Audio A that has a peak of 1,000 units, and it meets a wave from Audio B that peaks at the same time with a peak of 1,000 units. Guess what? That peak is now 2,000 units, which represents an increase in volume for that wave of 200%. (Audio is additive when mixed.)

Likewise, let's say two waves - one peaking at +1,000 units, and one anti-peaking at -1,000 units - meet. The additive result? 0 units of volume. Silence.

Unless the waves are constantly kept in sync, as would be the case for noise cancelling headphones, the effect will be sporadic, but the overall volume will tend to increase by a number of decibels.

This means you are now destroying any volume setting you have done, and are operating blindly with regards to volume. Which is not a good thing when it comes to using ultrasonic audio, most especially through headphones.

Never use ultrasonic audio through headphones while multiple audios are playing on the same device.

I also would like to say, never use ultrasonic audio through headphones. Again. People have been ignoring this, and the point you raise is one reason it was brought up to begin with.

I recommend against playing multiple audio sources from the same device. If you must, never use headphones to do it. As long as you don't use headphones, you should be okay.

Hmm...I'm a little confused as before you had stated that it's okay to play the ultrasonic while listening to something else on our laptop thru the speakers. The above statement seem to imply the opposite. I do this during the daytime sometimes and I want to make sure this isn't causing issues with the subs effectiveness?

My point being that volume is affected in ways that we cannot measure when you play two things at once through a single source. This is not an issue when the audio is audible. Ultrasonics are not audible, and measuring them for volume can become tricky. Still, it should not be a problem unless you are also using ultrasonics with headphones... in which case we don't know what the effective volume of the ultrasonic is, and we are feeding it directly into your ears. That is a potential issue.