Axiom Home Page Forums General Discussion Home Theater Has anyone experienced speakers over 23kHz

My friend recently bought Akira on blu ray, 192/24 as we all know. We got into a big conversation of is there any truth to hyper sonics at all. Accoriding to that Nyquist theorem that means it should be capable of sending frequency signals of about 86 khz, 66khz higher than human hearing! I'm curious how many of you ever experienced super tweeters capable of that, and if you ever noticed anything in such recordings. In all honesty I think it is a gimmick, even though the idea sounds interesting. Can't find much scientific info on hyper sonics unfortunately, was wondering what you guys make of it.

I think it's a bunch of horseradish, myself.

Bantha fodder is my current stance on it as well.

Higher sampling rates are not about higher frequency response, but about less aliasing though out the audible range.

Since you brought up Nyquist, yes it takes a 40 kHz carrier to reproduce a 20 kHz signal, but that signal must be precisely aligned. Think about this a 20 kHz sine carried in a 40 kHz PCM encoding, will appear the same as a triangle wave, one sample up, one sample down. If that signal shifts 90° in phase, it becomes silence. 45° cuts the amplitude in half. Only right on do you get the full energy recorded. Anti-aliasing in the down mix only serves to average the stored signal into half-amplitude also. Even a more reasonable 10 kHz signal still has pretty bad aliasing issues. But if you increase the sampling rate four fold, it's much easier to store the full energy of the signal without having to worry about exact phase alignments.

If I were recording I'd master at 384 kHz, low-pass filter at 24 kHz, and then anti-alias into a 192 kHz mix for distribution. There'd be no ultrasonic component for so-called super tweeters (nor to destabilize poorly designed Class D amps), but a very accurate representation of the original analog waveform.

I nominate ClubNeon for US Secretary of Audio Mastering.

My Marantz SR6003 cannot process the 5.1 192kHz/24bit signal from the BDP-80

It will only show 2 channel at 192kHz/24, playback the 96Khz/24bit version, have no problem with the processing....

Chris I'm not sure you make enough money where ever it is you work... I wonder how well Axiom pays their engineer team?

Quite a few receivers don't have enough power to both decode the a lossless 192 kHz, multi-channel, Dolby/DTS bitstream and apply processing.

See if you can configure the BDP to ouput LPCM instead of bitstream. Then check to see if the Marantz is still getting 192, and if processing has been re-enabled.

I still stand that BD players should only output LPCM, and do away with bitstreaming.

I would design things for free if someone would build them, and just give me one to play with.

If you're phone is ringing, it's probably someone from Axiom.