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Bottlehead Amplifier Discussion / Comparison Thread: Crack, SEX & Mainline

Discussion in 'Headphone Amps (full-size)' started by loquah, Sep 24, 2013.
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  1. CarlosUnchained

    I'm new to DIY world so I'd like to start with a kit and the Crack caught my eye.
    Since is an OTL amp It does not pair well with my LCD-X.

    I'm looking for advice on what parts change/add/remove to make it more powerful on the 20 ohm region.

    Also I'd like to add a second pair of RCA variable output to use it as preamp.

    Is something like that possible having the Crack as a base?
  2. deserat
    I think you'll find this requires an Output Transformer. The Crack being an OTL ( Output Transformer Less ) Amp outputs at the native output of the tubes, there is no transformer to change the output impedance. While it may be possible to introduce a Transformer, I'm pretty sure it would destroy the unique characteristics of the Amp itself. Best just to buy a S.E.X. which is designed for high Watt, low impedance headphones.

    Last edited: May 31, 2017
    CarlosUnchained and Allanmarcus like this.
  3. CarlosUnchained
    Thanks @deserat

    I was wondering what nice speakers could S.E.X. drive having 2W per channel below $1000.
    That's the only thing why I'd choose S.E.X. over Lyr 2.
  4. Doc B.
    I agree, horses for courses. That's why we make five different headphone amps. The S.E.X. amp works very well with power demanding headphones, and for speakers Blumenstein Orcas are a very nice match.
    CarlosUnchained likes this.
  5. CarlosUnchained
    @Doc B. I have a question regarding the S.E.X.

    Is there any difference between the two pair of RCA out?

    Is it possible to implement a switch to select RCA or headphone out?

    Thanks for the recommendation.
  6. Doc B.
    I'm afraid I don't understand the question. There are no RCA outputs on a S.E.X. amp, only binding posts and a TRS headphone jack. The binding posts are cut out when the headphones are plugged in.
  7. CarlosUnchained
    Oh I see, my bad. I thought those were RCA.
  8. CarlosUnchained
    Is the C4S included in the S.E.X. 3.0?
  9. deserat
    CarlosUnchained likes this.
  10. CarlosUnchained
    Is it possible to have a balanced 4 pin XLR from the speaker taps?

    Anywhere to buy such wire or individual parts to DIY (which ones)?

    Is it possible to assemble everything inside the S.E.X. and make a hole in the chasis for the XRL output?

    Would the speaker taps work if also connected to speakers having this setup?
    Last edited: Jun 5, 2017
  11. CarlosUnchained
    Sorry for the amount of questions but I'm reading the whole thread and catching up some possible issues.

    I read that the noise floor for low impedance planars is present. I have the LCD-X wich is the most efficient of all. If that's an issue with the LCD-2 I guess the S.E.X. is not a good match for the Xs.
  12. deserat
    I've run the S.E.X. 2.0 with Mr Speakers Ether C and they are silent. 23 ohm.
    CarlosUnchained likes this.
  13. Solarium
    I'm also convinced that Mainline is a superb combination with the HD800. I do however use the Mojo with the Mainline, have you made any comparisons with the Mojo vs the Gumby pairing with the Mainline/HD800?
  14. deserat
    I've not, I've only used the Mainline with the Bimby and the Gumby. I can say that it's the only amp cycled through that made the difference between those to dac's worth the price difference. I keep pondering the Mojo for portable use, but haven't bitten the bullet yet. Saw a Hugo go for the price of a Mojo on ebay last week, so I'm being patient about that purchase.

    I have however finally put the about 300 hours on my Mundorf Supreme's highly recommend that ugprade. :)
  15. Solarium
    Hugo for the price of a Mojo!? I would have jumped on that like a fat kid on ice cream!

    What difference does the Mundorf Supreme make? How much did you get it for?
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