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Headphones sensitivity, impedance, required V/I/P, amplifier gain - Page 4

post #46 of 58
Quote:
Originally Posted by miceblue View Post

I should post in this thread since I keep losing it within my bookmarks and I always want to refer back to this. XD
I find myself digging for it a lot, too lol
post #47 of 58

Subbed, thanks for all the work Xnor.

beerchug.gif

post #48 of 58

Those measurements for LCD-2 and LCD-3 seems strange to me. lcd-3 should definitely be more sensitive.. Maybe I'm wrong, but didn't you swap it?


Edited by Dano91 - 8/31/13 at 11:36am
post #49 of 58

It is probably mostly a result of random manufacturing variations. At InnerFidelity, there are several LCD-2 and LCD-3 measurements, and both typically vary in the range of 0.15-0.25 Vrms at 90 dB SPL, with the exception of one LCD-2 (older revision) sample that needs only about 0.1 Vrms.


Edited by stv014 - 8/31/13 at 12:08pm
post #50 of 58
Yeah, Tyll has like 4 different measurements for the LCD-2 and all 4 are different. -_-
post #51 of 58
Thread Starter 

Yeah, if you compare the most sensitive LCD2 he measured with the one rev2 he measured you get about 6.5 dB difference.

 

Difference between the LCD3's is about 4 dB. So all numbers are average, and as stated in #1, can be off by +/- 3 dB.


Edited by xnor - 8/31/13 at 12:27pm
post #52 of 58

Are you sure about K271/272 sensitivity? Going by Tyll's results, they ought to be at 107-110-ish dB/V. Spec is 104.

 

Data for more / older headphones (usually spec, some measured) is available in ye olde sensitivity table in my spreadsheet department, along with a simple sound output level calculator btw. Maybe I'll port some of these to JS so they can be used online.

post #53 of 58
Quote:
Originally Posted by sgrossklass View Post
 

Are you sure about K271/272 sensitivity? Going by Tyll's results, they ought to be at 107-110-ish dB/V. Spec is 104.

 

It could be 97 dB/mW (translates to about 109 dB/V) instead of 97 dB/V.

post #54 of 58
Thread Starter 

Fixed based on IF's measurements. Either seems to be something wrong with other measurements I've found on the interwebs or the drivers compress/distort extremely at "higher" SPL.

post #55 of 58

Subscribed...

post #56 of 58

Thanks for the thread! Quick question: W/ the T50RP (and its many mods)... is there any science behind the idea that these headphones crave lots of power, like 2 MW per channel? Or do you think this is bunk? 

post #57 of 58
Thread Starter 

Careful, M means mega and m means milli. ;)

 

From the table in #1, Fostex T50RP need roughly 37 mW (milliwatts) or 1.4 V for 110 dB SPL.

iPods output around 1 V (=> 107 dB SPL), Sansa Clip 0.5 V (=> 101 dB SPL).

 

Those are peak levels with sine tones. The average SPL with real music is lower (see first post, subtract about 6 dB for highly compressed music, up to about 20 dB for uncompressed classical.)


Edited by xnor - 11/19/13 at 9:42am
post #58 of 58

Can you add Beyer 880 and 990 at 600 ohms?

Thanx

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