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[Don Hills]

  2 watts into 94 db/mW will yield 127 dB 

 
SPL is 20log10(p/pref) dB.
20log10(2048/1) = +66 DB.
94 +66 = 160 dB, so we were both wrong.

 

[JohnnyCanuck]

   
SPL is 20log10(p/pref) dB.
20log10(2048/1) = +66 DB.
94 +66 = 160 dB, so we were both wrong.

 
I get 127 dB as well.  Power is 10 times the log of the gain, not 20 (that's voltage).
 
(10 log 2000) + 94 = 133 dB.

 

[StanD]

   
SPL is 20log10(p/pref) dB.
20log10(2048/1) = +66 DB.
94 +66 = 160 dB, so we were both wrong.

 
Originally Posted by JohnnyCanuck /img/forum/go_quote.gif
 
 
I get 127 dB as well.  Power is 10 times the log of the gain, not 20 (that's voltage).
 
(10 log 2000) + 94 = 133 dB.

That's gonna hurt a lot 

 Does that mean that 1 W is enough?

 

[JohnnyCanuck]

  That's gonna hurt a lot 

 Does that mean that 1 W is enough?

 
Nah.  You don't want to compress the peaks -- go for the 2 W.  Just don't turn the volume control to 11.

 

[davidsh]

 
 
I get 127 dB as well.  Power is 10 times the log of the gain, not 20 (that's voltage).
 
(10 log 2000) + 94 = 133 dB.

10*log(2000) = 33 if my mind don't fail me.
(33+94) dB = 127dB 

 
 
If we were talking these numbers for speakers we would be dubbed insanse, lol. For a 90 dB/W speaker we would be talking 8500 watts to reach 127 dB.

 

[StanD]

   
I get 127 dB as well.  Power is 10 times the log of the gain, not 20 (that's voltage).
 
(10 log 2000) + 94 = 133 dB.

 
 

  That's gonna hurt a lot 

 Does that mean that 1 W is enough?

 
 

   
Nah.  You don't want to compress the peaks -- go for the 2 W.  Just don't turn the volume control to 11.

So who's got an audio chain with an SNR that's that good? Who's got a compressor or limiter in their chain? I've got a toenail clipper handy.

 

[davidsh]

   

Spoiler: Warning: Spoiler!

   
I get 127 dB as well.  Power is 10 times the log of the gain, not 20 (that's voltage).
 
(10 log 2000) + 94 = 133 dB.

 
 

  That's gonna hurt a lot 

 Does that mean that 1 W is enough?

 
 

   
Nah.  You don't want to compress the peaks -- go for the 2 W.  Just don't turn the volume control to 11.

 

So who's got an audio chain with an SNR that's that good? Who's got a compressor or limiter in their chain? I've got a toenail clipper handy.

It's all about headroom 

Really, the 1-2W thing is just a guide line, as with most specs that manufacturers give us, we don't know what the distortion is at the specified output level, nor how it behaves relative to output level.

 

[JohnnyCanuck]

  10*log(2000) = 33 if my mind don't fail me.
(33+94) dB = 127dB 

 
 
If we were talking these numbers for speakers we would be dubbed insanse, lol. For a 90 dB/W speaker we would be talking 8500 watts to reach 127 dB.

 
You're correct.  I calculated the numbers correctly but my fingers screwed me up when I typed my reply.

 

[StanD]

   
 
 
 
So who's got an audio chain with an SNR that's that good? Who's got a compressor or limiter in their chain? I've got a toenail clipper handy.

 
 

  It's all about headroom 

Really, the 1-2W thing is just a guide line, as with most specs that manufacturers give us, we don't know what the distortion is at the specified output level, nor how it behaves relative to output level.

Let's see, I plug my HE-500's into my Asgard 2 (1 W), I turn it up real loud and I don't hear clipping on the peaks. I can turn it up much louder ans still not hear any clipping but I don't want to get hearing loss or feel uncomfortable. 1 Watt is plenty. How many audio chains have an SNR of 120 dB, how many recordings have such a SNR or usable dynamic range? Most of the crap we listen to is compressed and limited. If I'm listening to classical music must I turn it up so loud as to hear some guy in back of the orchestra cut a fart while the orchestra is playing? IMO, this is where everyone starts dreaming of things that have little practical value.
OK fellas, it's time to cut the Schiit and let this thread return to normal. 

 

[davidsh]

   

Spoiler: Warning: Spoiler!

   
 
 
 
So who's got an audio chain with an SNR that's that good? Who's got a compressor or limiter in their chain? I've got a toenail clipper handy.

 
 

  It's all about headroom 

Really, the 1-2W thing is just a guide line, as with most specs that manufacturers give us, we don't know what the distortion is at the specified output level, nor how it behaves relative to output level.

Let's see, I plug my HE-500's into my Asgard 2 (1 W), I turn it up real loud and I don't hear clipping on the peaks. I can turn it up much louder ans still not hear any clipping but I don't want to get hearing loss or feel uncomfortable. 1 Watt is plenty. How many audio chains have an SNR of 120 dB, how many recordings have such a SNR or usable dynamic range? Most of the crap we listen to is compressed and limited. If I'm listening to classical music must I turn it up so loud as to hear some guy in back of the orchestra cut a fart while the orchestra is playing? IMO, this is where everyone starts dreaming of things that have little practical value.

 

Distortion rises with output generally speaking.. So it might not be clipping but the distortion figures would probably increase. Whether that is something the human ear can perceive... I don't really know.

 

[StanD]

  Distortion rises with output generally speaking.. So it might not be clipping but the distortion figures would probably increase. Whether that is something the human ear can perceive... I don't really know.

Yes I'm sure that I'll notice the slight rise from 0.008% to 0.05% THD while I'm clutching my nutz in pain. 

Enough already.

 

[SP Wild]

  My hybrid X-CAN V3 output is rated 1W (not sure @ which impedance). With my HD600 (300 Ohm) I'm only using 1/8 of a volume pot (-54 dB)... otherwise my cans turn into a pair of small loudspeakers.

 
My HD650s used to sound harsh and lean when I cranked it up.  I thought it was how this headphone behaved.  It did it on my XcanV3 and Lehmann BCL.  It's not the headphone, it's the amps.  Once I got a headphone amp capable of massive power...the HD650 was capable of much more.  Ditto my K701s.

 

[Don Hills]

To everyone calculating the SPL: Remember it's Sound Pressure, not Sound Power. 20 log10, not 10 log10.
So 160 dB, not 127 dB.  http://en.wikipedia.org/wiki/Sound_pressure
Feel free to PM any replies to me rather than clutter the thread.
 
As has been pointed out to me, I forgot to convert voltage ratio to power ratio. 127 dB it is. Sorry about that. Shutting up now...

 

[JamieMcC]

   
 
I can also see hip types wearing a 5-panel
 
 
 

Do you know the name of the font used?