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A Couple Little Things I'm Wondering About

Two quick questions for anyone with any experience with either topic.

1. Why do some folks with usually higher end systems use those cable lifters to keep the cable elevated? What are they intended to do? If you use them, what do they do for you please? And if you know do they make sense from a purely technical standpoint? 

2. I bought a bunch of those gold plated caps to cover all the unused RCA jacks on the back of my AVR. I believe they are intended to keep noise down. If you use these, please comment on them. Do you think they do what they're supposed to do, and/or do they make sense from a purely technical standpoint?

Thanks!
jcolespeedway
rodman99999
6,158 posts
 
@dannad- No problem, although; I’ve never used REW.      My Tact RCS 2.2X has a program that sends a very short, very strong initial FFT pulse (pop), to each of my main and subwoofer amps.      Any possible room reflections would take longer to reach the mic, than the direct, initial impulse, from speakers to mic.      The program’s time window is short enough to ignore anything arriving at the mic, after that short, initial pulse.      Once the algorithm has the data regarding arrival time differences, between each main and sub (L + R), it delays the the main, to bring it into phase with it’s respective sub, as well as adjusting the sub’s SPL to match (in my case).      Been my favorite function of the unit.      It frees me from having to time-align the acoustic centers of my subs’ drivers, with those of the mains, like back in the old days (over 20 years ago).      Of course; the closer the subs are to an alignment with the mains, the less correction the TacT has to do.      I’ve used programs/equipment in professional settings(ie: the DBX DriveRack), when bi or tri-amping, that perform the same function.      Nothing new!      After that; achieving a flat room response, using the typical auto-curve, is cake.
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rodman99999
6,158 posts
 
I was wondering what direction your next change of topic would take.      The twists and turns are usually endless (circular thinking).     Those of your ilk are great at semantic gymnastics.      The term, "PULSE", in regards to FFT transfers, is now your problem?      (https://apps.dtic.mil/dtic/tr/fulltext/u2/a369180.pdf)      and: (https://dsp.stackexchange.com/questions/62176/difference-between-fourier-transform-and-fft-of-rectan... )                   "Convolution function" is the perfect description, for your cult’s program!      Nothing what-so-ever, to do with this thread and- no surprises!     So tedious!
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rodman99999
6,158 posts
 
I explained how my TacT’s program uses FFT to time/phase align my system, as simply as possible, and I’m trying, "...to look like an expert..."?      Hilarious!      Semantic Gymnastics is NOT a science, but- obviously all you’ve got.    Nothing you've injected here has anything to do with the OP's queries.       What you’ve proven: you’re a waste of keystrokes.      The ubiquitous last word is yours, with my compliments.      You obviously can’t refrain.
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