Rives PARC parametric equalizer

You are right that with a digital parametric this could be a concern, but with analog circuitry it's negligible.

Excellent point. This worried me as I use a digital parametric, as far as I can tell from literature it has a 20 microsecond delay (about two samples at 96 Khz). I only pass the sub signal through this EQ (for the same reasons as Dotsystem and the logic that if it aint needed then keep it away in case it does something bad to the mid or treble from the mains). What does 20 microseconds amount to in delay....well it is about two thousands of the wavelength of an 80 Hz signal which amounts to moving my sub woofer back one-third of an inch. So unless I discover that the delay is much worse then I am not worried.

I agree with Rives that Analog circuitry would be negligible - no worry about delay!

Any additional comments from users of the PARC

Super cool system you have there. I always felt a slight loss of resolution. Your system is all tubed and the application I installed the PARC in was all tubed also. It might not be as noticeable in a solid state system. Ultimately, I made room and tuning changes that satisfied me.
Looking at your room, I would recommend some tube traps to experiment with.

Interesting that this topic has returned. The comments by Rhljazz match my viewpoints on this subject. For a tube-based system where harmonic information and 3D is a strength of the system, the PARC is most definitely going to affect the performance of the system in these key areas.

My comments on using the PARC are here

Not only does the PARC alleviate modes that are untreatable with bass traps, ASC Super Traps in my case, reducing those modes significantly opens up the soundstage and transparency and improves elocution significantly.