Decided to move this to a new thread to keep the Multi-Bit Schiit thread on track... As @Serious mentioned, AFAIK the MegaComboBurrito is a linear phase filter which will have both "pre and post ringing". You want both "pre and post ringing" in order to approximate an ideal interpolator closely. The price you pay is latency. From my perspective "Pre-echo" and "Post-echo" stuff seems like some bullshit terms coined by some folks to solve problems that do not exist at the expense of creating real problems. The only reason I see to use a no "Pre-echo" filter is if you want lowest possible latency at the expense of some accuracy.