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Headamp Blue Hawaii Special Edition - Page 400

post #5986 of 5995

the "loosing bits" heuristic is overdone, audio  DAC tech has improved since mid 1980's barely 14 bit linear ADC/DAC at the beginning of the consumer digital audio era

 

now flagship audio DAC have >120 dB weighted S/N - you have to have your music peaks hitting 120 dB SPL for the DAC noise to even reach the human hearing threshold in quiet after minutes of accommodation - not a limitation while listening to music peaking at 120 dB SPL

 

so if your system's gain structure is reasonable for your headphone's sensitivity the DAC electronic noise is already as low as humans can hear, better than any of microphone, studio, listening room or just the microphonics you get wearing headphones (muscle tremor, blood flow/pulse, "seashell " effect raises headphone listening noise floor ~10 dB over free field listening in  a anechoic chamber)

 

even 16 bit source is almost always played back in 24 bit DAC in audio today - good attenuation software should redither but the much higher electronic noise is in fact good dither at the 24 bit lsb level

post #5987 of 5995
Quote:
Originally Posted by justin w. View Post

setting the BHSE volume to max is the same as if it had no volume control


But would that introduce unwanted noise? I have a pre amp in my chain and I always end up with the volume knob at 12 a clock, esp for GSX-Mk II
post #5988 of 5995

poor system gain structure is the usual issue when audible hiss is encountered - with ES headphones and their dedicated amps things aren't so bad as people using amps with too much gain to drive too sensitive headphones

 

Stax ES "earspeakers" have ~ 100 dB/100V sensitivity, the amps typically 500x (SR727, Justin's BHSE) or 1000x (original Blue Hawaii) gain

 

I don't have enough of the history at hand - but likely dropping ES amp gain to 500 is a recognition of the reality of consumer digital audio source  often having 2 Vrms full scale level

 

older analog audio reproduction systems had variable peak output levels generally lower than today

post #5989 of 5995

Does anyone know if the loop output only works with the selected input?  For example, in RCA out RCA loop, or is it possible to have RCA in but loop out through the XLR loop out?  

post #5990 of 5995

Sometimes, when I plop down into my listening chair wearing the 009s, I hear what sounds like a diaphragm deforming, a sort of "pop".  Has anyone experienced anything similar to this?  Does anyone know it is not an issue ?-)

post #5991 of 5995
Quote:
Originally Posted by statfi View Post
 

Sometimes, when I plop down into my listening chair wearing the 009s, I hear what sounds like a diaphragm deforming, a sort of "pop".  Has anyone experienced anything similar to this?  Does anyone know it is not an issue ?-)

 

A distinct sharp pop with electrostatic headphones is not a good sign at all, generally indicates either arcing or extreme diaphragm instabilities.

 

But a "woosh" or gentle slap is very normal and not at all a problem.

post #5992 of 5995

Stax fart.


Ali

post #5993 of 5995
Quote:
Originally Posted by dude_500 View Post
 

 

A distinct sharp pop with electrostatic headphones is not a good sign at all, generally indicates either arcing or extreme diaphragm instabilities.

 

But a "woosh" or gentle slap is very normal and not at all a problem.


Stax 009 User's notice warns about this, stating that it's no problem.

post #5994 of 5995

Ali x2.  STAX fart.  Benign.

post #5995 of 5995
Originally Posted by greggf View Post
 

Ali x2.  STAX fart.  Benign.

Thanks, guys!

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