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HifiMAN HE-6 Planar Magnetic Headphone - Page 961

post #14401 of 15238
Quote:
Originally Posted by cradon View Post
 

What stand did you get?

I present to you "Whitney." A practice head from a hair salon...free! :D

 

1162787

post #14402 of 15238

m8..

post #14403 of 15238
Quote:
Originally Posted by potterma View Post
 

The "fat one from + to - " provides a load to the amp.  Nothing more.

The series resistor in combination with the impedance of your headphone is what creates the attenuation.

 

If you want to modify the HFM box to bypass the resistors, why don't you just go straight to the speaker taps and completely remove the HFM box from the picture?

 

That is correct. The 10 Ohm resistor in parallel (connected to the positive and negative) is to lower the resistance the amplifier sees. The HE-6 are 50 ohms (in theory) and combine with the 10 ohms resistor in parallel the amplifier will see a load of only 8.333 ohms (R1(50)*R2(10))/(R1(50)+R2(10)). This is the one that helps the amplifier see a load more in line with the resistance it was designed to operate with instead of 50 ohms.

 

The resistor in series ( on the positive of each channel) does the attenuation. This is to protect the drivers of your headphones when you are using an amplifier of 100 watts or more, You can see this one as an insurance. You don't need it but is good to have it if your amplifier is 100+ watts per channel in 8 ohms.

 

If you are using a SS amplifier of less than 100 watts/ch and with a strong power supply you really don't need either resistor. I have use the headphones directly to Pass Labs Aleph 3, Aleph 5, Threshold T50 and MHA100 without the resistors with no problem. I just put the Mills resistors in parallel on the MHA100 and notice a little better bass (did not happened with the other amps) so I am going to leave them on. Since all those amps are 50 watts/ch or less I have never used the resistors in series.

post #14404 of 15238
I've ran the 6s on speaker amps up to 400+ watts without the box. Just have to take care using the volume control. The higher the wattage, the less play in the volume control but it can be done. I came to the conclusion that attenuating at the headphone took some of the liveliness from the presentation. JMO
post #14405 of 15238
Quote:
Originally Posted by musicman59 View Post
 

 

That is correct. The 10 Ohm resistor in parallel (connected to the positive and negative) is to lower the resistance the amplifier sees. The HE-6 are 50 ohms (in theory) and combine with the 10 ohms resistor in parallel the amplifier will see a load of only 8.333 ohms (R1(50)*R2(10))/(R1(50)+R2(10)). This is the one that helps the amplifier see a load more in line with the resistance it was designed to operate with instead of 50 ohms.

... snip...

Almost, correct.  Don't forget to add the series resistor.  Looks like a 24 ohm in the pic?  If so then, assuming nominal 50 ohms for the HE-6, 10||(24+50) or 8.8 ohms...

post #14406 of 15238

Most of the power is absorbed by the 10 ohm resistors too and that power is proportional to their values.

post #14407 of 15238
Quote:
Originally Posted by Silent One View Post
 

My speaker tube amps with the HE-6 are "Star grounded" and dead quiet (Shindo Laboratory Sinhonia monaural amps). Hum, ground loops and stuff can appear at anytime.

 

Or disappear at anytime too. I believe the hum comes externally, I haven't figured out its source yet.

post #14408 of 15238
Quote:
Originally Posted by wuwhere View Post

Or disappear at anytime too. I believe the hum comes externally, I haven't figured out its source yet.
We have some power issues where I live; the voltage is.a bit higher than one would like and that makes the transformers vibtrrate/hum sometimes. Same amps are dead quiet at the dealer when I get them checked. You cannot hear it a few steps away so I ignore it. I got a vintage variac and had it reconditioned and hat helps.
post #14409 of 15238
Quote:
Originally Posted by wuwhere View Post
 

Most of the power is absorbed by the 10 ohm resistors too and that power is proportional to their values.

Well.....  The 10 ohm resistors provide a load for the amp.  They draw current and dissipate heat.  They do NOTHING to protect the headphones.

 

Let me say that again:  They do NOTHING to protect the headphones.

post #14410 of 15238
Quote:
Originally Posted by potterma View Post
 

Well.....  The 10 ohm resistors provide a load for the amp.  They draw current and dissipate heat.  They do NOTHING to protect the headphones.

 

Let me say that again:  They do NOTHING to protect the headphones.

Not exactly.  There are two paths for the current to run.  Current runs most in the path of least resistance.  Voltage accross both are equal at the volume level.  The 10ohms will dissipate 5/6 of the total power to the both the resistor and the headphone. This means the heaphone is getting 1/6 of the power at the volume level, and with the 400watt capable amp, the total wattage drawn by the two loads is depends on the volume level.  whether if the HE-6 can be blown is dependent on the volume level and therefore how much is drawing at that level and the HE-6's power rating, but the resistor in paralell is taking 5/6 of the total output power.


Edited by SilverEars - 8/2/14 at 10:42am
post #14411 of 15238
Quote:
Originally Posted by wuwhere View Post
 

Most of the power is absorbed by the 10 ohm resistors too and that power is proportional to their values.

So this is partriallly correct(significant power is absorbed by the resistor is quite correct), power is inversely proportional in parallel load configuration.  In series, the power is V^2 proportional to the voltage drop.  So yeah, paralell is better solution, but looking into the rating of the resistor or it will burn out since that's a lot of wattage.  Get high rated resistors. 


Edited by SilverEars - 8/2/14 at 10:41am
post #14412 of 15238
Quote:
Originally Posted by SilverEars View Post
 

So this is partriallly correct(significant power is absorbed by the resistor is quite correct), power is inversely proportional in parallel load configuration.  In series, the power is V^2 proportional to the voltage drop.  So yeah, paralell is better solution, but looking into the rating of the resistor or it will burn out since that's a lot of wattage.  Get high rated resistors. 

 

I use 12 watts but 5 watts should be alright since they can handle much higher than that for a short time. Mills are good.

 

http://www.soniccraft.com/mills_resistors.htm

post #14413 of 15238
Quote:
Originally Posted by wuwhere View Post
 

 

I use 12 watts but 5 watts should be alright since they can handle much higher than that for a short time. Mills are good.

 

http://www.soniccraft.com/mills_resistors.htm

actually what wattage you need can be guessed based on the HE-6's SPL which is around 80dB/mW?   So, you pick louder than listenable dB level and can be estimated by taking the proportion of the power the resistor takes.  Of course this value if low enough not protect your phones from being blown from accidently raising the volume to extreme.  In order to make volume control more adjustable, decrease the resistance, but would there be resistor less than 10 that can withstand so much power?  I guess so since speaker wires take in lots of power.

post #14414 of 15238
Quote:
Originally Posted by gjc11028 View Post

We have some power issues where I live; the voltage is.a bit higher than one would like and that makes the transformers vibtrrate/hum sometimes. Same amps are dead quiet at the dealer when I get them checked. You cannot hear it a few steps away so I ignore it. I got a vintage variac and had it reconditioned and hat helps.
Same here! When my PC's PSU start buzzing and clicking, the voltage out the wall is about 1.5V higher.
post #14415 of 15238

I live in S. Florida, FPL is terrible. Their power fluctuates a lot.

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