The CS-300X has five inputs, a tape monitor and a headphone output. It delivers 15 watts via a...

Leben CS-300X

  • The CS-300X has five inputs, a tape monitor and a headphone output. It delivers 15 watts via a quartet of NOS Mullard EL84 pentodes configured for push-pull operation. The driver stage consists of 2 x NOS G 5751 dual triodes which are DC coupled to eliminate noise. The loudspeaker output also drives the headphone port - cans and speakers receive identical signals. The CS-300X has a unique bass boost control that operates via a simple cap/resistor circuit on the negative feedback loop as opposed to a separate, more complex circuit as commonly used. A 15-kOhm resistor prevents any undue sonic influence of this control on the midrange. The little "Life" is self- biasing via a cathode resistor which supposedly reduces noise and precludes any periodic fiddling with a multi meter and screwdriver. Just plug it in and let the good times roll. Various audiophile goodies litter the innards of the Leben, including metalized polypropylene caps with mesh-shielding, caps from Sanyo and Elna, "RMG-F type" resistors with gold-plated leads and custom transformers.

Recent Reviews

  1. levlhed
    My *last* amp..for real this time!
    Written by levlhed
    Published Sep 20, 2012
    Pros - Sound, Looks, Size
    Cons - Price, but you get what you pay for
    What you have heard about the Leben CS-300X(S) is true.  A truly wonderful amp for both headphones and speakers.  I run Beyerdynamic T1's and the sound is simply stunning.
  2. b2nyc
    Fantastic...and it powers speakers, too
    Written by b2nyc
    Published Aug 16, 2010
    Pros - Tone..detail without fatigue, lovely natural bass. Not cheap, worth every penny.
    Cons - Short on power for super ineffiecient speakers. Sound better with Mullard NOS EL-84 tubes so you can spend a bit more money. No remote, no problem
    I just love the Leben sound.  It makes music.  Really, get this little wonderful integrated and obsess on something else, because the 300 XS makes music.  Can't imagine wanting anything else for an amp.  EL-84's work great for headphones given their detail and tight base.  The soundstage is wide where it should be wide, and tight where it should be tight.  
    My musical tastes are all over-the-map.  However, when I listen to Jazz Trio or Female Vocal the Leben is spot on.  It has the speed to play House Music and Rock out.  

    OK, it cost more than the others, but you can save a fortune because you won't be swapping out amps every 60 days.  Spend the $$$ on DACs, right?
      Argo Duck likes this.
  3. Skylab
    Mini-review - Leben CS-300X
    Written by Skylab
    Published Jun 29, 2010
    Pros - Delivers world-clkass sound from a very wide variety of headphones, and very full-featured
    Cons - somewhat expensive and hard to get
    The Leben CS300X has made me re-think what's possible from a headphone amp in general, and tube amps in specific.  While it has a highly musical, engaging sound, it's not the least bit tubey or syrupy - in fact it's astonishingly neutral and transparent.  Due to its being push-pull, and transformer-coupled, it works well with a wide variety of headphones.  It drove my LCD-2, DX1000, T1, W1000X, Ed 8, and D7000 all better than I had ever heard before.  It's so good I wish I had one in every room. 
    Looks nice too:
    The Leben sounds great with the LCD-2 and T1 - I could very happily live with that combination for a long, long time [​IMG].

    What has struck me about the Leben is that it seems to work well with all the headphones I own - regardless of impedance. But what's been really beguiling me is how great it is with the low-impedance Denons. I've absolutely never heard the Denons sound so good. Not surprisingly, none of my OTL tube amps really did the Denons justice, it would seem. I quite frankly did not think the Denon's could sound this good. The Leben lets them reveal nuance and detail I didn't think was in them.
    I did some rolling with the CS300X.  I tool out the RCA grey-plate ^BQ5's, and put in JAN-Sylvania black-plates.  I also took out the Sylvania 5751's and put in JAN-Hytron triple-mica 5751's.  Amazingly, the Leben sounds even better.  I knew there was room for some improvement in the tubes I had in there, but these really do take the Leben up another 5-10% in performance.  The lower-gain 5751 is definitely the best choice for headphones, since the Leben has LOTS of juice for cans.  The 12AX7 might be better for speakers, though.
    As some users have reported, I have a very slight buzz on my most sensitive headphones.  Can't hear it at all with my LCD-2, Ed 8, HE-5LE, D7000, or T1.  Very slight with W1000X.  More noticeable with the DX1000, but the DX1000 has revealed very small noises of lots of amps that I couldn't hear any noise with any other headphones.  And to be clear - all of the above is with NO music playing - can't hear it at ALL with music playing, with any headphones.
    I can't really express how much more I prefer the Leben to the other headphone amps I have.  I want to listen to ONLY the Leben.  Unfortunately, I can't take it everywhere [​IMG]  But when I am at my bedside rig, it's a real treat every night to end my day with some time on the CS300X.  It's special.
    While it's hard to get in the US, it's worth seeking out, IMO.  Very highly recommended!
    1. xEcuToR
      I've very little idea about Leben amps, so I ask you this question. Do you think this amp can drive a HE5 and a K340 (Balanced) ?
      xEcuToR, Aug 20, 2011


To view comments, simply sign up and become a member!