Hi everyone, Dennis Foley from Acoustic Fields. Today we're gonna talk about the foot behind.
This is mostly for two channel guys that have spent a lot of time in their room, have dialed
in their setup. What we call the power triangle, where it's the speakers that form the apexes
of the equilateral triangle. So guys that have a room and have their system set up spend a
lot of time adjusting speaker distance, towing in. moving left, right, and then they dial
it in. So they position the triangle in a way in the room that sounds good to them. And that's
kind of the goal of voicing really. That's the tuning process that you go through. So it's
set up, movement, listening, change, movement, listening. It's a whole process that we go
through. Drives most people crazy, I get that, but. You know, we know what we want, we know
what we're listening for, and more importantly, we know when we're not getting it. And when
we're not getting it, it's the fault of the room. Pretty much the fault of the room. Not
so much setup. Setup's critical, but there's a lot of distortion in the room that we have
to deal with. So to test that, let's take our current listening position and just move the
chair back 12 inches. Put on your favorite sources. And listen, that's a 12 inch change in the
listing position to the rear of the room. Okay. What do you hear? Start with the low frequencies
first. Any changes in the lows, mids, highs? Well, you're going to hear them. And of course
the changes are going to be different for each room, but there's big differences in just 12
inches. So kind of transfer that kind of thinking to the whole room. with the three sound fields
that we have to work with. You know, sidewall to sidewall, floor to ceiling, and front to
rear. So we have all those sound fields to deal with. So you hear a big difference in just
12 inches. Can you imagine what's going on in all three sound fields? And that's the room
distortions and it's pressure and reflections and that's what you have to fix. So... The
time signature of our reflections is really critical for two channel because these sidewalls
have to be equal distance and the treatment has to have the proper rate and level so that
we don't get too much of this going on. We want to minimize that. That's the goal. Okay. We
want to minimize all that. So. We want to make sure that the time signature of managed reflections
don't interfere with the direct energy. We want to make sure that the treatment has the proper
rate and level. And look at our foam technology graphic. You can see the linearity in that
performance. Okay. And that's what you want. That's what you want with this kind of stuff.
You want a linearity, you want a predictability, you want a consistency in the performance.
That's the goal. And that's what we spent eight years and millions of dollars trying to create
and generate so you can see that you wouldn't treat a problem with big dips in response around
250 Hertz, like you're seeing in the competition there, right? All right. So music and voice
require a linearity and treatment. Don't forget that. That's critical. You can't treat a problem
with another problem. And that's what you're doing there. So, and definitely don't. forget
about the three sound fields. People forget about it all the time. They get width and length,
but they forget about floor to ceiling. And that 70, 80 can go as low as 50 cycles sometimes,
depending on distance. So 50, 60, 70, 80 Hertz on average is the problem, floor to ceiling
in most rooms. So a little fun experiment, the foot behind, to kind of give you an idea of
what the whole room goes through. Hope this helps. Thank you. Thank you for watching this
video and if you liked it, please give us a thumbs up. We also have a newsletter that you
can subscribe to, so please do that because we offer special price discounts to only those
on our newsletter. And then don't forget about our forum. We have started a forum on our own
website where people will ask questions and I usually get a chance every couple days to
look at it. There's an interchange between people on the forum and we'll give you real answers
on a regular basis so that'll help you. Thank you.