How do we measure a speaker in a room with SATlive. We
verified our audio analyzer setup. We measured a microphone cable. We measured
an EQ and now we're ready to measure a speaker in a room but before we actually
hit play let's think about what to expect. What kind of assumptions we have
here? So I think one of the best ways to do this is to have something we can
compare it to already and if you have the exact speaker measured somewhere
else already that's the best thing right and sometimes you can do that so here's
our speaker we've got a JBL PR x6 15m and sometimes you can look around even
either from the manufacturer just by googling around you can find an impulse
response or someone else's measurement that then you can just import and Mineo
something really close comparison and that's great and then you can say follow
this is a speaker in the room from someone else let me see if my speaker in
my room looks the same a lot of times you can't do that so what I do as a
backup is I'll just import a Meyer sound speaker because I have just from
exporting from fxt I have all of the Meyer sound speakers as CSV files
@tsmart traces and as impulse responses what I did here then was like
right-click on one of these quick traces I click import CSV data
and then from here I can load any of my Meyer Sound traces now this shouldn't be
impulse response it should be you
you can see in phase response I'm happy to share all of these with you because
someone else gave them to me so I'll put a link below this video
where you can download those so what I did was I grabbed a upq because I feel
like that's pretty close to what I have here 15 inch driver on the low end
and then I just imported that know when you first import this the amplitude
display is gonna be way up too far for you to even see so the first thing you
need to do is just hit the center trace button here and that will bring that
down an offset of about minus 109 just great so now we have a speaker to look
at now remember this is a $10,000 speaker in an anechoic chamber that
we're about to compare to a $500 speaker in my room at home with a bunch of
reflections and stuff but now I have something and you'll notice that the
phase trace did not import I'm not exactly sure how to get that in there so
if you know how to do that if you know how to take one of these CSV files or
take one of these measurements originally from fxt get it into a quick
trace and smart I'm sorry it's at live let me know because I would love to know
how to do that but for now all I have is the amplitude trace o'clock
so at least I have a speaker here to look at I'm gonna take that away for a
second um what else should we think about well we probably want to guess
what is our delay finder setting well I know that it's about it takes them on a
millisecond for the sound to go through the x32 so it takes about a millisecond
for this sound to come out of my computer's audio interface through the
console and get to the output that's one millisecond and then how far away is my
microphone hear from the speaker well maybe it's about three feet that's about
three milliseconds so let's guess that my delay setting is gonna be about four
milliseconds why do I care well if it's something really far off like 40 or 50
milliseconds or negative 100 milliseconds then I'll know that maybe
something's wrong so I want to have an idea of about what to expect in each of
these settings so I expect maybe some amplitude sort of like this and I expect
a delay of about 4 milliseconds so let's go ahead and hit play on the measurement
see what we get
you
so this is a new installation of satlok because I had to reinstall windows
through a parallels so not all of my display settings are the way I like them
here so let's change a couple of things I want to stop the generator on memory
assignments so that when I hit shift 2 to record that quick trace it stops the
generator so I don't have to listen to me secondly I don't really like when the
live trace fills to the center like that so I want to go to my trace controls
there you go trace layout
filth ascends your amplitude there we go and let's get rid of those cool so now
I've got that upq and here's my prx that I just made okay obviously not the same
thing but at least I know okay this is one of you PQ and then anechoic chamber
looks like here's what my prx in my room looks like right now and wow this is
really hard to read so what we can do is left-click and then shift that phase
around so it's just a little bit easier
okay so it looks like the delay locator has locked on to this area up here and
then everything below that is arriving late so a lot of wrap arounds but maybe
that's normal for this kind of speaker at this point I just want to help you
take the first steps with measuring a speaker in the room so that now you can
start playing around with it and you can start connecting
what things look like in a room look what things look like on your graph on
your audio analyzer so that this peak here in this room with this measurement
microphone position looks like this and I move it around I see what the changes
are and as I play with this and spend some time with it I can start to maybe
see some trends ah when I change this the high frequencies do this and when I
move the microphone down then it's measuring more the low frequency driver
and then you can start saying things about that but this is just the first
step we'll take for measuring speaker in a
room so if you're not getting these kind of results
post a question below this video and I want to try and help you out I want you
to get to this step so that now I can move on to the next steps and talk about
measuring other things talk about why these things are happy that's it if I
were to continue playing this playing with this by myself I would probably you
know move the microphone closer I'd move it up and down I aimed speaker at the
wall move the microphone way over there and just keep saving traces and then
look at how things are changing okay so let me know if this is working for you
and I'll see you in the next video
sound design