Lesson Description
L Class line array ground stack deployment training
6m 18s
In this section, we'll cover the ground stack deployment of an L Class line array using the Array Frame over the LS118 subwoofer, and more!
Lesson Transcript
L Class line array ground stack deployment training
6m 18s
0:07
Hello and welcome back!
0:09
Today we’re taking a look at deploying an L Class line array as a ground stack over a subwoofer.
0:15
There are two models of the Array Frame and stack adapter accessories.
0:19
Each specific the LA108 and LA112.
0:22
It’s important to note that the array frame models cannot be mixed and matched between the two Array loudspeakers.
0:29
Let’s go.
0:30
If this is the first time using your array frame in a ground stack configuration,
0:35
there a few pre-assembly steps that we’ll need to perform to prepare the array frame to be used.
0:40
Some assembly required…
0:46
On first use, adhere bumper pads to the bottom of the Array Frame as demonstrated.
0:59
Then, secure the Tie Down Assembly to the M20 thread on top of the subwoofer and tighten it down.
1:07
Now, we’re ready to attach the Array Frame to the subwoofer.
1:15
Place the Array Frame onto the subwoofer, with the bumper pads facing down.
1:19
Secure the array frame to the tie-down assembly with the tie-down knob
1:24
With the Array Frame secure, let's now connect the stack adapters.
1:28
First, attach the front of each angle arm to each side of the array frame using the angle arm rigging pins.
1:47
Now let’s get stacking!
1:48
We’ll start by setting the angle on the stack adapter first.
1:51
This will determine the overall down tilt angle of the array on the subwoofer.
1:56
The stack adapter allows for a 6 degree, 0, -6, and 12 degree down-tilt angle.
2:03
Once we’ve set the down-tilt, get your first loudspeaker
2:06
and set the locking levers on both sides to the middle “add” position.
2:10
Hook both front strikes of the loudspeaker onto the front hooks of the array frame.
2:15
Lower the back side of the loudspeaker until the angle arm of the stack adapter latches onto the rear hook of the loudspeaker.
2:21
You’ll know it’s secure when you hear it click.
2:24
Push the locking levers into the down “Lock” position on both sides.
2:28
Now repeat this process to continue stacking each loudspeaker above the next, until your array is complete.
2:47
Now we can adjust the angles as needed.
2:49
In a ground stack configuration we are working from the ground up.
2:53
Press the angle levers on the loudspeaker BELOW the loudspeaker that you intend to adjust.
2:59
Now adjust the angle of the loudspeaker until it clicks into its next position.
3:02
Repeat as needed.
3:08
When setting your splay angles it’s important to be aware of the Progressive Splay angle rule.
3:13
This rule states that a larger splay angle value cannot be used above a smaller splay angle value,
3:19
as this will result in an unsupported loudspeaker array that is not possible to optimize.
3:24
The angle values must either match or progressively increase in size from the top of the array to the bottom.
3:30
For example we have a four box array here with the angles 1.5, 6, and then 12 degrees from top to bottom.
3:37
An example of an unsupported array would be if you had the angels set to,
3:41
let’s say 12 degrees, 6 degrees and then 1.5 degrees from top to bottom. No good.
3:47
Technically, the hardware will allow for any combination of angles to be set throughout the array
3:52
But, if the progressive splay angle rule is broken,
3:55
the internal optimization will not work.
3:58
Our engineers have spent a lot of time making sure that your array works with correct deployment angles,
4:03
so just follow the rule and save yourself lots of time and headaches
4:07
In a ground stack configuration,
4:09
you can stack up to 4 LA108 loudspeakers
4:12
and up to 3 LA112 loudspeakers above the LS118 subwoofer.
4:16
A quick note: when stacking the LA112 above the LS118,
4:20
the subwoofer must be turned onto its side.
4:23
This adds stability needed to support the larger LA112 loudspeakers
4:27
while making the stack more aesthetically pleasing since the sub’s width now matches the LA112
4:32
You’re not limited to stacking the L Class above the LS118 however:
4:37
The LA108-AF array frame will attach to the KS118 in vertical orientation
4:41
and the LA112-AF array frame will attach to the KS212C in horizontal orientation
4:47
using the same M20 thread featured on those QSC subwoofers.
4:56
When it’s time for tear down we can remove each loudspeaker starting with the top
5:00
by setting the locking levers to the up “Remove” position and lifting the loudspeaker off of the front strikes.
5:06
Repeat this all the way down until the last loudspeaker is removed.
5:16
Detach the array frame by removing the tie-down knob from the Tie-down assembly,
5:21
then unscrew the tie-down assembly from the M20 thread mount.
5:27
All of the components of the stack adapter kit can be installed for storage within the array frame itself
5:33
when not in use, to keep all components together, making it nice and tidy for travel or storage.
6:04
And with that, a single operator can successfully deploy and ground stack line array by themselves.
6:09
Move on whenever you're ready.