Posted 21 February 2012 - 11:13 PM
exau2i multi-channel asynchronous usb i2s interface fft plot
using 1khz -80db @ 32bit float/192k
Does this plot indicate that with gear currently available, jitter can effectively be elimiated?
Whether its the jitter, or whatever, these sure are special devices. The EXA U2I with Buffalo dac and the EXA E18 dac I'm using are giving me so much enjoyment I'm amazed they havent received a lot more recognition . The spatial presentation of these things is amazing , soundstaging is stunningly 3D , with placement of instruments so precisely positioned. Sometimes with a good recording you can sense such precise imaging in both depth and width that its like listening to a recording in a completely different way , hard to explain but no way i'm giving these devices up.
I'm using the E18 dac straight off the dac ouputs with the opamps and filters disconnected, tube output, and trying different combinations of the dac outputs ( the dac chip has 8 outputs, 4 per channel ) and the difference between using just one output and 4 in parallel is quite significant, output impedance is obviously the main factor, but I suspect something else is happening here. Its interesting that people comment on the Sabre "sound'- i can tell you there are a number of Sabre "sounds" , but I doubt the differences wouldn't be so audible without the incredible transperancy of the exa I2S devices.
End of transmission, over and out.
System1: Mac Mini with Amarra Symphony and IRC room speaker DSP, , ExaU2I/Ackodac, tube output stage for dac, various DHT preamps using 4P1L or 10Y tube in output stage , DEQX active digital crossover( some digital EQ to compliment IRC) Hybrid Active MartinLogan stats with12" bass drivers, passive crossovers removed, direct connection to step up transformers. High power SS amps(1000 watts into 1 ohm), active sub for bass room mode correction with DSPeaker bass equaliser, Various turntables, tube MC phonos.
System1.5 Windows7/JRiver, EXA U2I/Ackodac, Tube output stage for dac. DHT preamp, Mondeuse positive feedback 100 watt monoblocks, Lipinski sudio monitors over JBL active subs, 3rd active sub using DSP to counter room modes
System2: Windows7/JRiver/, Exa E18 with custom tube dac output or Amanero/TDA1541/stacked 844/j-fet dac, Supratek DHT 71A phono and line stage tube preamp, Stacked AR-LST vintage speakers modified for active operation and driven by 6 of 100 watt Supratek tube amps. Micro-Seiki RX-5000 turntable.
Workshop: Windows7/JRiver, ExaU2I/Buffalo dac with custom tube output, Supratek DHT preamp , active Nakamichi Dragons ESL's or Tannoy Monitor Golds/Acoustic Elegance 18" subs, using preamp's tube subwoofer output 24dB@65Hz. Tube amps with Tannoys, SS with subs.
Coming: Audio Optimiser 2 computer setup. PSE-144 horns.