I added the Son of Ampzilla II to my main system 7 months ago. I am bi amping my Magnapan speakers ( 1.7i and Base Panel) with their own power via two amps. My other amp is an integrated amp - a Krell KAV 400xi. I feed the signal from the Krell pre amp out to the Son of Ampzilla. The sound out of the Son of Ampzilla now feeds the 1.7is. It beats the Krell’s amp stage on headroom, soundstage and midrange. Granted my Krell is 14 years old - but it has been a workhorse. I recommend Spread Spectrum Tech.
