hello I'm Dave Rat and today we are going to listen to the difference
between a speaker cable that's coiled up unspooled and I'm gonna dump it onto the
floor and then I'm gonna coil it up in a
figure 8 pattern and show you the proper way to figure 8 a wire or a cable there
actually is a wrong and preferred way of doing it so let's start out on this
setup if you watch some of the other videos are done with this speaker cable
testing you'll be familiar I'll go over it briefly if you haven't watched them
and you want to know more there's several of them out there while I
describe to setup in depth but basically this allows us to listen to the actual
loss or the difference between the input and output of a speaker cable we we have
a speaker here a home hi-fi speaker that's wired up across one of the wires
and any sound alteration that is caused by the speaker cable will be audible to
us and visible to us on this analyzer peak noise I've got a 4 ohm load 100 foot
12 gauge cable and we're listening to one of the wires the losses will be
doubled because there's two wires and if I'm gonna test the load there is no
differential between what's at the front end of the cable in the back end there's
no current going through so we hear nothing here output here across
terminals and without touching the amp volume that's how much signal is being
lost or the difference in drop from the beginning to the end of the cable with
the 4 ohm load, I can put a 2 ohm load on there
I am going to have to unplug it for a second and 2 ohm load and then 4 ohm load which is quieter because there's
less drop with the higher impedance level so listening to this cable coiled up and on
this analyzer here you should be able to see we see a 6.3K peak and
from the other testing we found out that that's due to the coiling quite a bit of
that's due to the coiling of the cable the inductive aspects of the coil so
what we're trying to do is get rid of that peak because really what we want to
see we don't really care about losses too much these lost in a fairly slice
but what we don't want to see is that the losses are altering the frequency
response of the signal arriving at the other end if there's a 6.3 peak
theoretically we should have a 6.3 dip in the other end and it won't be flat
if speaker cable attenuates all frequencies evenly and we lose a
fraction of a dB who really cares we have other aspects that we do care about
damping factor and transient response but one of those factors is that the
frequency response is linear also coiling power cables AC cables can
create inductive loads as issues with that as well so let's look at the
difference between a coiled cable and spooling it out on the floor and I'll do
that and I'll hush down so you can hear the difference and should be able to see
it
let's go ahead and store and then we should be able to be that later
spooling out fun part oh I was gonna shut up so much for not talking during the
spooling process but we can see it so now you should be able to see that we
just have a slightly rising response we don't have that 6.3 although it's not
ideal it is preferable not to have a narrowband peak there probably get a
little better play all right so let's go ahead do it a figure 8 and see what
happens so now I'm gonna do two different types of figure 8s first
I'm gonna figure eight in a pure figure 8 where we just keep crossing in the
middle and what's happening here though is the inductive load is caused by the
coil the energy going in the same direction so the coil that I'm coiling
right now continues to be constantly clockwise these coils will all be
interviewed fooling around this way these coils are going so we plan to form
the uniform direction and that's the opposite of what we really want to have
occur just coiling a figure eight like this
And it's almost done here
there we go and we can see that the peak at 6.3 isn't as big as before it
actually moved up to 8k but we've gained that peak back and basically clothing
like this is really just the coil and we can see that it's come back that's been
opened up and that's not the optimum set up so let's go ahead and go back
and I will show you the proper way to coil a figure eight is actually think of
an oval so we'll go around this oval here and we're making the first turn and
the second turn and they were to cross over the middle and then we're going to
go this way when the first turn second turn cross over the middle turn turn
middle so you're forming a loop around the outside and then crossing so we
cross to turn turn cross cross and the reason we're doing this is if we just do
a figure eight everything continuously goes in the same
direction but if we do this turn turn cross we go it's going
counterclockwise counterclockwise in the second turn we cross over and now it's
going clockwise clockwise crossover counterclockwise counterclockwise cross
over so by doing that every other turn goes the opposite direction
turn cross
turn across try to think here turn turn
but now look at this we have a figure eight setup and we've maintained the
frequency response that we saw with an unspooled cable furthermore since we've
got this every other thing goes up to direction even when we fold this
properly wounds figure eight in half we still maintain the frequency response
that we saw with a spoolled out cable alright so there's the proper way to
figure eight a cable and a demonstration that it makes a difference and something
you can hear cool hope you like it