This is just one person’s experience to share with everyone curious about Emotiva. The experience is limited to only the XPA-1’s.
PRO
The XPA-1 is relatively neutral. It can reveal obvious and subtle sonic differences caused by cable and component switching upstream.
It claims to be “high current” capable and proves it by maintaining total mastery over a pair of current-hungry Thiel CS3.7s. The 3.7’s practical impedance measures 2.5-ohm over the entire audible spectrum.
The XPA-1 is relatively noise-free, at least in my system. When paired with a good line stage, there is no hiss or hash or ringing as the volume goes up. No ear-piercing highs, no ear-drum thumping hardness and no listening fatigue. Totally without strain or distortion that we can hear at higher db in our listening space.
High, mid and low are seamless and has no obvious “voice” of its own. CDs with varying recording characteristics show through. Bad recordings sound bad, decent to good recording sounds decent to good. Excellent recording puts a performance right in our room.
I have no way to measure if the CD player or the stylus is able to retrieve “all” information off the CD or LP. With that in mind, the XPA-1 seems very capable of reproducing everything it is fed. Whatever it is we can hear is always clear and easy to hear. There are no "what's that?" moments.
CON
On a few occasion, it may be a hair less tout in some low end? I cannot tell if it is the low end limitation of the 3.7s or the amp. For example, it is always capable of delineating complex low end instrument lines but on very rare occasion, it would seem to be just a hair less tout for a certain instrument. Hard to pin down if it is the amp, the recording or the speaker. Not something we care about because it does not impact the performance but readers may want to know.
XLR input has no locking tab. This is normally not a problem for normal use but irritating.
In a few rare instances, it may sound a hair less fast? I am not totally sure because it is only hinting at it. For example, it plays most snare drums passages perfectly with attacks, distinct fullness of the notes and so on. On rare occasion, in a complex passage, the distinctive note would not be as distinct. I cannot tell if it is the recording or the amplifier. Again, not something we care about because it does not detract from the overall musical presentation but you may wish to know.
The XPA-1 will not make poor quality upstream components sound good. Solid state line stage or preamplifier that exhibit any sort of tipped-up or "thin-bodied" sonic characteristics will really sound bad through the XPA-1. It requires a good line stage or preamp that can pass along good uncolored signals. Use of thin low quality cables is a no-no.
GENERAL
Our system started with:
ARC CD2 / ARC PH3 / Bryston BCD-1 + ARC LS25 / ARC LS26 + ARC VT200 / Bryston 7BSST2 + Thiel CS3.7.
The VT200 could not do the 3.7 justice. The Bryston 7BSST2 gain structure does not match well with the ARC's. The 7B also has a sonic quality that does not match our tastes.
After some experimentations, we settle down to:
ARC PH3 / BCD-1 + ARC LS26 + XPA-1 + CS3.7.
Our original candidates to replace the 7BSST2 were the ARC Ref 210 or Bryston 28BSST2. The XPA-1 were temporary replacement meant to set a low-end baseline for comparison to “high performance” products. We are now satisfied enough with the XPA-1 to suspend our amplifier search.