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zenelectro last won the day on March 29 2012

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  1. zenelectro


    Wow - and that applies to everything! Mike these speakers look incredible. Love the P2P crossovers. Terry
  2. Hi harfdef, Sorry to hear your bad luck with the Enkianthus. I'm pretty sure I have one of those ATF II upsampling modules here. Having said that the non locking issue may well be something else. WRT quality I believe their digital filters were very good. Send me a PM if you are interested to have it looked at. cheers Terry
  3. Steve, which filters (if any) do you prefer and have you compared good DSD vs hi-rez PCM. There's no doubt this DAC is incredible value given the technology inside.
  4. The Devialet uses hybrid (advanced segment) DAC PCM179x (from memory 2) so that's interesting.
  5. They are very good except for jitter rejection which is a bit inexcusable in this day and age. The linearity and distortion appears absolutely first rate which is to be commended for a discrete R2R architecture. Not an easy feat.
  6. zenelectro

    Lenehan LK1 Kit speakers Reviews

    Mike How do these compare to the original ML1's that I have? I'd like a bit more bass but don't want to sacrifice anything else to get it - as you would expect I guess ultimately I need to go up to ML2's down the track. cheers Terry
  7. zenelectro

    USB Only Grob vs Terminator

    I don't know that he openly published the design but it is certainly explained with a fair amount of detail. It's a fairly complex process of calibration and apparently the first time it's powered up takes the longest. Also the resistors are in a temp controlled oven. Each 'bit' has it's own (from memory 10 bit) DAC that does the initial adjustment. I have a feeling this design is no more due to parts availability and the Lavry top DAC is no longer a strictly R2R however not 100% sure about this. Regardless, I remember reading about this DAC's operation many years ago and thinking - wow, this guy is a serious designer. Those were the days when some of those Pro DACs were really serious efforts and many hi end DACs were a joke. Apogee's (By Australian Bruce Jackson) DA2000 was an R2R based DAC that had custom digital filters and a discrete potted zero feedback I-V module. Yes I read that. Interesting that the lowly old TDA1541A scored best marks for detail retrieval. New is not necessarily better. Well I'm bucking the system and cooking up a multiple parallel PCM1794 DAC with custom dig filters and clocking. Why go with trends and in fact if the numbers pan out an actual DR of 140dB (or better) should be achievable. T
  8. zenelectro

    USB Only Grob vs Terminator

    Oh - that's right, we are talking about DAC's! LoL
  9. zenelectro

    USB Only Grob vs Terminator

    I'm with you on this one Bill. The vocal is very treated with compression and EQ. The album, Ten New Songs to me always sounded kind of half baked and a bit plastic from a sonic perspective. It was recorded in his very modest home studio. The drums and percussion were all sequenced. However having said the above I think from a creative perspective it kind of works. I think that's probably what he wanted. There are certain fake themes and a falseness in life that he delves into with this album and this is almost what the sound appears like to me. But it's very compelling. Great albums are not always about high fidelity Maybe if the same songs were recorded in a big studio with live drums big production the album would not have the same impact. With Leonard Cohen the genius is in the songs. Terry
  10. zenelectro

    6C3CC tube driven SET amplifiers

    Those Merlot amps look sweet. I recently had a pair of Lamm 2.1 monoblocks come through for service. Built like trucks inside and out. WRT 6C33C - a great tube for SET.. and you can get some decent power without requiring crazy HT voltages. I measured the Lamms at over 20 watts / channel. They use an interesting arrangement where 1 of the 6C33C is used as a series regulator. As already stated a/ they require a decent driver b/ they are all over the place WRT matching c/ The biasing can also be tricky However don't let any of that discourage you - go for it. T
  11. zenelectro

    The end of the road

    Those amps look awesome KKK, well done. Other amps in the same league - I have a pair of Lamm 2.1 Monoblocks in for repair which I'll be keen to listen to. Same power and over double retail price (when they were made) of the Artisan so I'd say you got a bargain. PS Just to add - I know Earle winds his own transformers so there's significant value added. The Semi-Pi wind OP transformer is a really good design, I've done a few myself over the years inspired by the original Lothar Keidel Pi wind done for John Burnett of Lenard Audio. T
  12. The peaking and distortion are most likely two separate things. The peaking will almost certainly be OP transformer related. Looking at 10kHz square wave response tells the story. The rising distortion versus freq could be any number of things. If the OP transformer has limited BW then this will affect FB and for stability FB has to be rolled off at higher frequencies. T
  13. zenelectro

    Advance in Class D amps?

    Yes I was generalizing Zaph - you know that LoL FWIW - which pres were they and did you get chance to measure them ? Z
  14. zenelectro

    Advance in Class D amps?

    It is linear due to the internal feedback and relatively low transconductance compared to BJT (or most high gm fets used for audio) If you degenerate a fet or bjt to have similar transconductance to triode and run into similar load they end up with fairly similar distortion (at low frequencies). Where the triode wins is a/ no voltage dependent capacitances b/ no thermal junction modulation related distortions But for most SS pre amps we are talking distortion levels that are way below triodes running open loop. Quite a few SS pre's have distortion so low it gets hard to reliably measure, IOW < 0.0005% or so (at low to mid frequencies). Where tubes really win is distortion versus freq. Very flat - due to those low V modulated capacitances. I think this flat dist versus freq characteristic is subjectively good for sound. As an example my latest Mic Pre design, which for all purposes is pretty similar to a MC pre save the EQ, has distortion at 100kHz that is not much different to 1kHz and at 60dB of gain. It's a tube / SS / transformer coupled hybrid, open loop (no feedback). One feature is you can manipulate the distortion characteristics to be H2 dominant, H3 dominant or mix them - or basically not have much distortion at all. So it's like baking a cake - add your harmonic ingredients Lots of fun and very useful for recording! Purists will disagree stating that adding ANY distortion is sacrilege - but to each their own - I disagree. Z
  15. zenelectro

    Advance in Class D amps?

    Of course not, you know me better than that. I was generalizing. As a generalization most tube preamps have more distortion than SS preamps and they also sound different - although obviously there are exceptions. If you compare something like an RTP3 to a Messenger or Audio Note, the RTP will be much cleaner and have a lower distortion profile. Z