@james633 I too have some added hiss/hum in my E112's when using them in my chain (between preamp and amp) as a high pass.
Hiss/hum is almost nonexistent after using a HumX on my left channel mono amp (JC1+) but now trying out my new tube amps (Virtus i2 mono), the hiss is 2-3 times as loud to the point I can audibly hear it from 10-12' away (versus ear by tweeter). This is volume/gain dependent with my tube amps. So turning them to max gain bypassing the attenuated volume controls (basically direct mode) the hiss gets louder. My solid state amps definitely handle the E112's better (less hiss). So now the hiss/hum is much better just running the subs on a y-splitter as they go from preamp --> RCA Y right and left channel --> right and left sub's and amps.
Whatever the E112 is doing as a HF filter is passing that hiss/hum to my amps and is worsened by the filtering.
I've ordered the CR-1 in hopes that this allows me to high pass my speakers while reducing the hiss/hum of the E112 sub's.
But my new Perlisten D12's also come next week. They have a pass through function to send the signal from amp, to sub, to sub (daisy chain), but I'm again curious if they'll produce any hiss/hum like the E112's do.
I even tried plugging everything into my Puritan 156 with special AC cord, and the hiss/hum still was present.
In all truth I was only running my amps and sub's through the Puritan, not my DAC, streamer and preamp. So maybe this isn't a fair assessment. IDK
I will keep you posted though of my progress.
