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In the Forum: Audio News
In the Thread: Paul McGowan. tubes in preamp
Post Subject: AMR DP-777 Bit Perfect IPosted by Amir on: 11/13/2018
I have listened to AMR DP-777 DAC (SE versio and upgraded nos tubes) many times.in my idea the best sound of AMR dac come from "Bit-Perfect I" filter if you listen to good records. if i put bad records then there is no difference between filters and even i may prefer other filters.
https://www.stereophile.com/content/abbingdon-music-research-dp-777-da-processor-measurements
Bit-Perfect I filter means there is no filter in signal path (no digital and no analog filter).the time domain response of this mode has no overshoot and the time domain response is perfect.
Audionote UK removed Brickwall low pass analog filter after 2003 and all new AN dacs have no digital no analog filters in signal path. I have Audio Note DAC 5 Special.
these NOS tube DACs may have problem in low frequency extension (in a bass extended system) and processing complex music like classical orchestra (these DACs could not drive low impedance pre-Amplifiers) but in my two way system they are better than other DACs.
I have listened to many many expensive solidstate DACs (dcs scarlatti , CEC da0 3.0 , accuphase 100/101 and ...) but non of them give me the true sound.all of those ss dacs use digital and analog filters.Rerurn to Romy the Cat's Site