UPDATE: to the post about my new ATCs. "There have been developments" as they say in police procedurals.
As background, I have to explain couple details of my overly complex signal chain:
- For the entire time I've had a desktop system, I've had subwoofers in the system.
- With both subs I've had, the signal from my DAC went to a headphone amp/preamp; then a 2M interconnect took the preamp output to the RCA inputs of the sub.
- Each sub had a high pass output pair (L+R RCA) filtered to remove signal below 80Hz (slope of 12 dBA/octave).
- Another 2M interconnect took the signal from the sub to powered speakers (NHTs; then Yamaha's); or more recently, the Wyred4Sound class D amp that powers the ATC SCM12 Pro's.
I've had upper midrange/lower treble anomalies in all 4 speaker systems I've used in this home office. I chalked my speaker issues up to room boundary stuff--ie, back wall being too close to back of speakers. For example, the Zenpro modded Yamaha HS7s, for example, had upper midrange shoutiness & congestion as well as overly plump bass due to rear port facing nearby wall & window.
Then I got the ATCs, which are renowned in pro audio for their accuracy & listenability. They sounded
really fine here as long as I didn't push the volume much (they're the best low-volume speakers I've ever heard, even somewhat better than the excellent Yamaha's). But when I cranked them up, upper midrange brightness & congestion kicked in. Hard to listen at medium-loud, as I like to do sometimes.
Meanwhile, for 2+ years I've had an external 2-way crossover made by Marchand sitting on the sidelines. This crossover splits the incoming/main signal into a low pass RCA pair (signal below selected crossover frequency); and high pass RCA pair (signal above that frequency). Crossover frequency is selectable & variable from the front panel; crossover slopes are a rigorous 24 dB/octave.
I've known for some time the only way to be totally sure the inexpensive little crossover cards in these subs aren't messing w/the sound, is to put this Marchand crossover in the signal chain. Which I just did. It took over an hour...wires everywhere.
WHAT A DIFFERENCE!!
This is one of the most successful audio upgrades I've ever done. Now I can crank the ATCs 'til my ears bleed...GREAT sound at any volume. The entire midrange sounds calmer, smoother, even more detailed. The lower mids/upper bass sound flatter, clearer, more detailed. These monitors are
extremely good...they make beautiful music. For the first time, I'm hearing them as intended. All because of a crossover switch...
Now I can't help but wonder what those Yamaha's "really sound like" (?!?) Will try that out this week, just for S & G's.