Patchbay normals: half-normalled, normalled and thru

A patchbay lets you reroute signals without reaching behind the rack. The normal is the connection a patchbay makes on its own, with no patch cable plugged in. Whether that connection exists, and what breaks it, is the difference between half-normalled, normalled and thru.

Getting it right in DaMatrix matters: the 3D signal path, Ask AI about this Rack and the AI cable checks all follow the setting you choose, so they can tell you where a signal really goes.

How a patchbay point is laid out

Every point on a TRS or XLR patchbay has two sides. DaMatrix names the jacks by the direction the signal travels, and the number at the end of the jack name is the point number.

• Source side: a device output plugs into the rear In jack (for example TRS In 3b). The same signal is available on the front Out jack (TRS Out 3f), so you can patch FROM there.
• Destination side: you patch INTO the front In jack (TRS In 3f). That signal leaves through the rear Out jack (TRS Out 3b) to a device input.
• The normal is the link inside the bay from the rear In to the rear Out of the same point. When it is on, the device on the source side feeds the device on the destination side with no patch cable at all.

Half-normalled

With nothing patched, the signal flows from the rear In to the rear Out. Patching into the front In breaks the normal: the destination now hears your patch cable instead. Patching from the front Out does not break it: the signal goes to your patch cable and still reaches the normal destination, so you can tap or split it.

Use it for most studio work, such as preamp outputs to interface inputs or interface outputs to a monitor controller. It is the most common setup and the default in DaMatrix.

Normalled (full normal)

With nothing patched, the signal flows exactly as with half-normalled. The difference is that patching into either front jack breaks the normal. Taking the signal out from the front Out moves it, so it no longer reaches the normal destination.

Use it where a signal should only ever go to one place, for example a feed that must not be split or loaded twice.

Thru (no normal)

There is no connection inside the bay. A signal only goes somewhere when you plug in a patch cable, from the front Out of one point to the front In of another.

Use it for tie lines between rooms, mic splits and returns, stage box lines, and any point where the top and bottom rows have nothing to do with each other. Thru is also called open or de-normalled.

Side by side

• Nothing patched: half-normalled and normalled pass the signal to the rear Out. Thru passes nothing.
• Patch cable in the front Out: half-normalled sends the signal to both the cable and the rear Out. Normalled sends it to the cable only. Thru sends it to the cable only.
• Patch cable in the front In: in all three modes the rear Out hears the patch cable, and the normal is off.

Set it in DaMatrix

Select the patchbay in your rack and open its device data. Under Patchbay Normals, choose the setting for the whole bay: Half-normalled, Normalled (full) or Thru (no normals). A bay you have never set up counts as half-normalled.

Real bays are often mixed. Click Point override, type the points (for example 23-24, or 1, 3, 5) and pick their mode. A common example is a half-normalled bay with a few thru points for tie lines. Click Save, and the setting is stored with your project.

Patchbay Normals appears on audio patchbays (TRS, XLR, bantam and TT). Network patch panels such as Cat6, keystone and fiber pass every port straight through from front to rear, so they have no normals; set them to Patch panel under Network Role instead.

What follows your setting

The 3D signal path follows a signal through each bay the way you set it up. Ask AI about this Rack describes every bay and lists where each signal ends up, including any that stop at a patchbay because nothing is plugged into the rear Out. When the AI suggests cables, DaMatrix traces them with your normals in place and warns you before you add a cable that leads nowhere.