[Red Dragon Audio]

NT

[mr_bill]

Hi heavy,
Why is the upper range of the frequency response so 'low' at 38khz or rolloff so quickly?
SACD extends higher than that.  Shouldn't the bandwith be larger?
Thanks,
Bill

[ekovalsky]

Hi heavy,
Why is the upper range of the frequency response so 'low' at 38khz or rolloff so quickly?
SACD extends higher than that.  Shouldn't the bandwith be larger?
Thanks,
Bill

Unless you are Batman I wouldn't worry about that  

Most of us are doing pretty good if we can hear 19khz.

[Red Dragon Audio]

Hi heavy,
Why is the upper range of the frequency response so 'low' at 38khz or rolloff so quickly?
SACD extends higher than that.  Shouldn't the bandwith be larger?
Thanks,
Bill

Hi Bill,

Thanks for the question(s). Here are further questions to get us thinking about the need for Ultra Wide bandwidth in audio applications.

[list=1]

• What percentage of speakers on the market have useable output above 20kHz? And what percentage of audiophiles own those speakers vs. every other speaker? (my speakers roll off gradually at 19kHz and have a bit of output up to 22kHz but fall off sharply after that)
• How many SACD recordings have information beyond 38kHz and does that extra information represent any significant portion of the music?
• When should we stop upper end bandwidth?  50kHz? 100kHz? 200kHz? 500kHz?
• How many CD's does the average audiophile own vs the average number of SACD's?[/list:o]
  
  
  It's not bad to have extension beyond 38kHz but I would not condemn an amplifier/speaker/component if it can't reach into the stratosphere and beyond.
  
  99.99% of all music is within the normal 20Hz-20khz range and anything above that is icing on the cake. So with extension to 38khz you get plenty of sweet, tasty iceing(if your speakers, source and material are able to output that kind of bandwidth).  
  
  
  I hope this answers your question and if you have any other questions, please fire away.
  
  Cheers!

[John Casler]

Unless you are Batman I wouldn't worry about that  

Most of us are doing pretty good if we can hear 19khz.

I was Bat Boy many (many, many, many, many, many) years ago, and still couldn't hear much past 14.5Khz

[art]

He did not spec how far down it is at 38 kHz, so your concern may not be merited.

All Class D amps...........doesn't matter if they are ICEpower,or whomever, all have low-pass filters on the output to remove utlrasonic energy. In addition, they have low-pass filters on the input, just as the front end of any digital recording chain.

In stock form, the 1000ASP has a more pronounced roll-off than either the 250ASP or 500ASP. Perahps you would be best served by asking him to compare the units to each other, and whether or not he takes any steps to address these issues.

Pat

[jermmd]

He did not spec how far down it is at 38 kHz, so your concern may not be merited.

All Class D amps...........doesn't matter if they are ICEpower,or whomever, all have low-pass filters on the output to remove utlrasonic energy. In addition, they have low-pass filters on the input, just as the front end of any digital recording chain.

In stock form, the 1000ASP has a more pronounced roll-off than either the 250ASP or 500ASP. Perahps you would be best served by asking him to compare the units to each other, and whether or not he takes any steps to address these issues.

Pat

Pat,

Pronounce roll-off at the upper frequencies?  could you explain how the 1000asp rolls off compared to the 250 and 500?

Joe M.

[Red Dragon Audio]

Hi Joe,

The 1000asp upper end frequency limit is 40kHz and the upper end frequency limit of the 250asp and 500asp is 80kHz.

I hope that helps answer your question.

[art]

I would rather Ryan explain that, as this is his thread, and his implementation. I just jumped in to help out a bit, so that he wasn't singled out unfairly from the rest of the gang using those parts.

Pat