Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › The Leben CS300XS Thread
New Posts  All Forums:Forum Nav:

The Leben CS300XS Thread - Page 131

post #1951 of 2087

Hi, guys i come to ask if worth it upgrade from a LD MK VI+ to Leben CS300 X, someone that heared LD MK VI+ and have Leben CS 300 X anyone?

post #1952 of 2087

I like the sound and versatility of Leben very much. It is one of the best sounding headphone amplifiers. And probably the best I 've ever heard. I'm sure it is better than LD, it is also better than my tube headphone amplifier (but to be true it does not sound 7x better than my actual amp). Leben is very expensive. So If it will not ruin your wallet - go ahead. Me, I have had to wait for better times. And when I'm thinkinkig how many records/files I can buy for this money makes me happy with my actual stuff.

post #1953 of 2087
Quote:
Originally Posted by Synthax View Post
 

I like the sound and versatility of Leben very much. It is one of the best sounding headphone amplifiers. And probably the best I 've ever heard. I'm sure it is better than LD, it is also better than my tube headphone amplifier (but to be true it does not sound 7x better than my actual amp). Leben is very expensive. So If it will not ruin your wallet - go ahead. Me, I have had to wait for better times. And when I'm thinkinkig how many records/files I can buy for this money makes me happy with my actual stuff.

 

It is good to see someone buying music these days anyway.

post #1954 of 2087

soooo ... no one heard both amps?

post #1955 of 2087
Quote:
Originally Posted by atistatic View Post
 

soooo ... no one heard both amps?

 

I've owned both amps for a couple of months, not in the same league, CS300 is superior in every aspect.

post #1956 of 2087
^ glad to hear that biggrin.gif
post #1957 of 2087

Humming issues on the CS300XS and high headphone impedance

 

I have been one of the users complaining about humming issues on the Leben. It has not been an issue with the Audeze LCD-2/3 or Hifiman HE500, but with the HD650 the humming has been so loud that I could not use it (except on heavy metal). It is more profound on the right channel, which Leben told me was du to the right output transformer beeing closer to the input transformer (which I kind of already assumed - just take a look inside..) Leben also told me that I have the version with a "high power" output, intended for low sensitivity headphone, using different transistors than the normal version. I have posted about this in here before. http://www.head-fi.org/t/415214/the-leben-cs300xs-thread/1290#post_8731184

I have assumed the reason for the HD650 humming is that they are quite sensitive at 103 dB. Today, however, I inserted my 110 dB SPL Sennheiser Momentum. 

 

Guess what: 
They are DEAD QUIET

 

Then I inserted the 62 ohm (105 dB/V) AKG Q701. Also dead quiet (but less surprising, though)

 

Since the Momentums are 18 ohm/110 dB with no humming, and the HD650 are 300 ohm/103 dB with lots of humming, I cannot draw any other conlusion than this: The humming on my Leben is dependent on headphone impedance, making high impedance cans more prone to humming than low impedance cans.

 

Anybody else share this experience? I have noticed that the humming complaints are often related to the HD800/650 so I will be surprised if I am the only one who find that high/low headphone impedance matters. 

 

So, you Leben hummers - plug in your sensitive low impedance cans and report :D

 

For people being consered about humming, I know some report no or little humming with high impedance phones. Why this is so I can only guess - but local AC issues might be a cause I guess (beeing no expert).


Edited by ardilla - 10/9/13 at 3:38pm
post #1958 of 2087

Hifiman HE-6 and Leben CS300XS

Also - today I have spent some hours listening to the Leben CS300XS and the Hifiman HE-6 using the HE-adapter. I think it sounds absolutely gorgeous, it totally transformed the HE-6 to some very fun and up-front headphones. Very different from my SS-alternatives. And really great. 


Edited by ardilla - 10/9/13 at 3:21pm
post #1959 of 2087
Quote:
Originally Posted by ardilla View Post
 

Humming issues on the CS300XS and high headphone impedance

 

I have been one of the users complaining about humming issues on the Leben. It has not been an issue with the Audeze LCD-2/3 or Hifiman HE500, but with the HD650 the humming has been so loud that I could not use it (except on heavy metal). It is more profound on the right channel, which Leben told me was du to the right output transformer beeing closer to the input transformer (which I kind of already assumed - just take a look inside..) Leben also told me that I have the version with a "high power" output, intended for low sensitivity headphone, using different transistors than the normal version. I have posted about this in here before. http://www.head-fi.org/t/415214/the-leben-cs300xs-thread/1290#post_8731184

I have assumed the reason for the HD650 humming is that they are quite sensitive at 103 dB. Today, however, I inserted my 110 dB SPL Sennheiser Momentum. 

 

Guess what: 
They are DEAD QUIET

 

Then I inserted the 62 ohm (105 dB/V) AKG Q701. Also dead quiet (but less surprising, though)

 

Since the Momentums are 18 ohm/110 dB with no humming, and the HD650 are 300 ohm/103 dB with lots of humming, I cannot draw any other conlusion than this: The humming on my Leben is dependent on headphone impedance, making high impedance cans more prone to humming than low impedance cans.

 

Anybody else share this experience? I have noticed that the humming complaints are often related to the HD800/650 so I will be surprised if I am the only one who find that high/low headphone impedance matters. 

 

So, you Leben hummers - plug in your sensitive low impedance cans and report :D

 

For people being consered about humming, I know some report no or little humming with high impedance phones. Why this is so I can only guess - but local AC issues might be a cause I guess (beeing no expert).


I had similar hum on my Leben for a long time (http://www.head-fi.org/t/415214/the-leben-cs300xs-thread/1725#post_9426924).

 

When I replaced a burnt resistor few months back  the hum was gone completely (http://www.head-fi.org/t/415214/the-leben-cs300xs-thread/1725#post_9427659). I can report now that the hum is still absent after about 6 months...on any type of headphones and speakers.

 

I think it is worth checking the condition of the wire-wound resistors visually (with a flashlight as it is hard to detect minor damage) and with a multimeter if possible...OR..better still just replace those wire wounds (they are cheap to buy).

 

If you get the same results I got...we may be on to something!


Edited by BugleBoy - 10/10/13 at 3:45am
post #1960 of 2087
Ardilla, you may well be right. I do recall having hum when using 600 ohm headphones with the Leben. My only headphones these days are the LCD-3 and W3000ANV - both fairly low impedance. And I have no hum issues on the Leben with those.
post #1961 of 2087
@skylab

I remember you writing that the Leben was designed for low imp headphones. Did you get that from Leben, or did you draw the conclusion otherwise?
post #1962 of 2087
It's inherent in the design - the Leben's headphone out is a 32 ohm secondary winding from the output transformer. Such a design isn't optimized for headphones significantly above that impedance, although that's really more about power transfer than anything I can obviously point to as inducing hum.
post #1963 of 2087
Quote:
Originally Posted by Skylab View Post

It's inherent in the design - the Leben's headphone out is a 32 ohm secondary winding from the output transformer. Such a design isn't optimized for headphones significantly above that impedance, although that's really more about power transfer than anything I can obviously point to as inducing hum.

So NwAvGays 1/8 rule doesn't work here, the output imp should not be significantly lower than the headphone impedance?

Ignoring the hum, the HD650 sound terrific from the Leben though..
post #1964 of 2087
I have hum with LCD-2 via headphone out, as earlier stated. This is at a low level, but it's there with no music or low level music.
post #1965 of 2087
Quote:
Originally Posted by LarsHP View Post

I have hum with LCD-2 via headphone out, as earlier stated. This is at a low level, but it's there with no music or low level music.

 

Hmm. Is it more pronounced at the right channel?

 

I had a lot more hum with the old tubes, they were the originals, now I have Gold Dragon EL84. But I got it second hand - might be that he original tubes was just worn out. 

New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Headphone Amps (full-size)
Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › The Leben CS300XS Thread