Headphone Correction Filter board

well the lcd-2s arrived today
initial impressions are really good.
well packaged,they look even better than i thought they would.
so far i am listening at same volume position on the panda as i do with the d7000.(even with same output resistor)
will be interesting to hear how/if they change over the coming days.
very happy so far though.

Frans/Javier
a pic of the graph supplied with my lcd-2s

It depends on what amplifier you were listening to before that.
Also depends on the volume (SPL) as we hear better in the late hours and tend to turn the volume lower which in turn alters the way we perceive sound.
When we want to 'check' if all sounds well or for changes usually one turns the volume up thereby altering the sonic presentation.
It's the reason why 'loudness or contour' volume controls exist and is based on the phon curves.

This may be a cause, could also be the membrane stretching marginally as it is under tension.

Imagining is a harsh word that can be interpreted as in 'being stupid'.
Perceiving things differently because of changed circumstances is not the same as imagining yet may feel as such.
Circumstances may not even appear to be that different but simply the passing of time is of great influence, especially at night.

The low impedance output would be best suited as it gives you more dynamic range (SPL)

The output resistance should not have an influence on the sound signature as the impedance of ortho's is ruler flat.
For this reason there is no frequency dependent voltage division as is the case with most dynamic headphones.

That said a direct comparison will be very hard to make as the amplitude drop you get because of voltage division is more than noticeable.

LCD2 is around 60 Ohms and when the output R is 10 Ohms you would have -1.3 dB in SPL as opposed to when NO resistors were present.
With 120 Ohm out the difference is -9.5 dB (opposite NO resistor).

The fun part of dB's is you can simply subtract and add. So 9.5 dB - 1.3dB = 8.2 dB level difference.
10 dB difference is a doubling of perceived loudness so this means the difference in amplitude is rather big.

For this reason switching impedances creates large differences in amplitude and thus in sound signature as well (phon curves and the fact we simply hear more nuances at higher SPL).
So to really AB you would have to switch the output and at the same action lower (or increase) the volume in the correct amount.

When this would be done correctly chances are there would be no difference.

On a low output R you will have 8dB more headroom which is a good thing but if you don't need it (as it plays loud enough) adding the output R can act as a 'limiter' for maximum SPL.

ill pass on that thanks, Ian.
but am open to offers on my d7000

ha
not quite what i meant.
nice try though

well to be honest i have not compared the 2 closely, reason being i cant put the lcd-2 down!
some say the d7000 treble is harsh, though i never thought that. having said that, if the lcd-2 treble does not extend as far as the denon, i cant say that i am missing that either.
have just emailed Javier to go ahead with the build of my lcd-2 filter, so i guess that should change things again.
at the moment i am tuned to the audeze,and am really considering selling the denon's already (never thought i would say that).
as for the "air", to me, there isnt a lot in it.
i have read the he-500 has more air than the lcd-2, so maybe i will go for a used pair of these in the coming months with the funds raised from selling the denons.
at the moment i may just have a bad case of "new toy syndrome", but i am loving it !!!