Nord User Forum

So, I have tried few headphones with 40/50 Ohms. The result is very low signal. There is a discussion on forum about this, and many says that you need lower impedance phones for higher signal.

My headphones (BD 770), are 250 Ohms, yours might be louder in theory, they are 38 Ohms (I quickly googled your headphones, not sure though). So be careful!

So, BD 700 with 250 Ohms are working fine, and some 38/40/50 Ohms are not. Is this mean that the higher the impedance-higher signal?? I am about to buy some AKG K140 with 600 Ohms just for ND2,so just checking??

I taught louder signal with lower impedance, so strange that you experience the opposite. Are you sure that the data for your headphones are correct?

sony MDR-CD480
http://www.head-fi.org/t/529654/vintage ... -ebay-sold

Just tested my ND2 with the following head-/earphones and results:
- Audio Technica IM50 in-ear phones, 10 ohms: decent, loud enough output signal;
- Skullcandy Uprock headphones, 32 ohms: pretty loud output signal.

I wanted to try my Fostex TR50RP studio headphones as well but couldn't find the 3.5mm/6.3mm jack-adapter, so this'll have to wait.

Hi,

My Senn. HD 595 (120ohm) are louder than my BD 770 pro (250ohm), I tested it with 'snare' sounds..
The frequency response is quite different, so it depends a bit on the drum sound.

I still think that, as a rule of thumb, lower impedance cans have higher output than higher impedance ones (with the same audio device). "the 'professional' designs (..) typically range from 150(omega) to 600(omega). Within this group it is often the case that the lower the impedance the higher the volume. (..) people tend to use high-quality 'professional'-impedance headphones with portable equipment, and this is rarely a problem, except that the maximum volume will be reduced compared to a lower-impedance design" SOS https://www.soundonsound.com/sos/jan03/ ... rkshop.asp

I can imagine frequency response of the headphones, and design (open/close/in ear) may also influence perception of loudness. I am a bit surprised by your finding, could the ND2 output be designed to lower the level when low impedance (say <100ohm) headphones are connected?

Cheers,
Albert

Does anybody know what is ND2 output impedance on headphones out?

Quick update,
I just found out that my Grados are 32ohm, with them I get a lower level than with my 120ohm headphones

So:
32 ohm Grado, lower than with 120 ohm Sennh. (loud enough though)
120 ohm Sennh. give me the highest sound level
250 ohm BD lower sound level than with my Sennh.

So this is in line with your findings..
Good point! No idea what the impedance of the outputs is,.. low I guess, maybe not low enough?
This I didn't know, maybe explains it: "The greater the output impedance the greater the voltage drop with lower impedance loads. This drop can be large to enough to prevent driving low impedance headphones to sufficiently loud levels. A real world example is the Behringer UCA202 with a 50 ohm output impedance. It struggles with some 16 - 32 ohm headphones." taken from: http://nwavguy.blogspot.nl/2011/02/head ... dance.html