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In the Forum: Didital Things
In the Thread: DA architecture: True Multibit vs. anything else.
Post Subject: Post dac chip simplificationPosted by mark on: 3/14/2008
i am well aware of the problems the 47 labs approach brings along with the good things it does.i have at times in my setups good results,in other setups disaster.47 and audionote use no digital/oversampling filter.this obviously can have negative consequences on its own and even more so when there is no analog post filter.but the point i was responding to was with your lavry you were proposing simplifying/optimizing post dac(i would guess it has a digital filter?) and it probably uses a different dac chip than 47(phillips i think),audionote(analog devices?or burr-brown),and is using 88khz sampling rate,so if you do a simplification post dac chip to this combination specificly tailored to the dac chip in the lavry it could possibly drive your active placette sufficiently in terms of dynamics, bass,rhythm.in some of my system setups with good bass power,dynamics in the speaker, amplifier part using 47 with placette in camparison to audio aero mk1,mk2 which has more than sufficient voltage gain(tube) and opamp buffering(less in mark 1 more in mark 2) the 47 was very interesting and competitive in terms of drive,and much better in rhythmic quickness(very interesting).it was also interesting to note that the AA mk1 with simpler post dac architecture(and alps volume) versus mk 2 more postdac opamp buffering (both of these have a different anagram upsampling setup and possibly different dac chip)myself and one of my friends preferred the mark 1(upgraded tubes and coupling caps) overall to the mark 2 and the 47 labs.the AA mark 1 just seemed more immediate and closer to real but i yearned for the 47 labs rhythmic quickness.it was also interesting to hear dual mono dac47(gemini) with dual mono ps.this is why now i am going to try john wrights bidat first as he sends it to me then possibly with an alternate architecture postdac into placette.as i posted before my goal is to meet or exceed the best of 47/audio aero with as little of the negatives.this will start to go down next month if john sends his bidat when i return to canada next week.so you see i am on an interesting parrallel path perhaps.i hope john sees this or if you could send this to him(i am moderately computer moronic).i hope this info is valuable to you or someone out there.and if you could elaborate on details of your preferred postdac chip setup on the bidat(gain,analog filter,takeoff point to your preamp board off dac chip?,etc.) i would be educationally gratefull.for the record i have never owned lowthers and only a fostex tweeter.i can certainly understand what and why you do not like about lowther and 47 labs.i have heard lowthers many times.i think that simplifying too much could be too much of a bad balance for some setups (noise,etc.),however tactfully implemented simplification/optimization(post dac chip)in the context of the optimal balanced setup preceeding the dac chip output(bidat?,lavry,other) could yield potentially great results.Rerurn to Romy the Cat's Site