The WTH (Wireless Temperature Hub) is a Multi-Probe Monitor: it watches the temperature of your build in real time and warns you before heat becomes a problem. It does this with two different kinds of sensor, and understanding the difference is the key to placing them well. This guide covers both sensor types, when to use each, how the channels are numbered, and how to get the most accurate readings.
A single hub supports up to 8 sensors at once: up to 4 non-contact infrared sensors and up to 4 contact temperature probes. Sensors are wired, not paired: plug one in and its channel appears on the dashboard automatically. For wiring and mounting steps, see the Installation Guide.
Two Ways to Measure Temperature
The hub reads temperature two ways, and each is suited to a different job.
- Non-contact (infrared). The WTH Infrared Sensor reads a surface temperature from a short distance without ever touching it. You aim it at the hot surface and it reports what it sees. This is the right choice for anything you cannot or should not physically attach to: a spinning cone, a subwoofer motor, a voice-coil area, or a component that is awkward to reach.
- Contact (probe). The Thermocouple Temperature Probe reads the temperature of whatever it is physically touching. You attach the tip firmly to a surface or terminal, and it reports the temperature at that exact point. This is the right choice for a fixed spot you can reach and secure: an amplifier heatsink, a power terminal, a battery post, or a wire lug.
Most installers use a mix. Point an infrared sensor at the moving parts you cannot touch, and clamp a probe onto the fixed hardware you can.
The WTH Infrared Sensor
The WTH Infrared Sensor is a non-contact sensor on a shielded cable. It measures the temperature of a surface by reading the heat radiating from it, so nothing on the sensor ever has to touch the target. That makes it ideal for parts that move or are hard to reach safely, such as a subwoofer motor or the voice-coil area of a speaker while it is playing.
You can connect up to 4 infrared sensors to one hub. Each one appears as its own channel on the dashboard as soon as it is reading a target.
Because an infrared sensor is often pointed at a moving cone or a target that shifts in and out of view, the hub includes Peak Hold voice-coil mode. When it is on (which it is by default, for infrared channels only), the hub briefly holds the highest temperature it captures so a quick peak is not lost between readings. You can adjust how long that peak is held in Settings. See Menus and Settings for the Peak Hold controls.
Aim an infrared sensor squarely at the target, straight on rather than at a steep angle, and keep the distance short and consistent. A sensor pointed off to the side, or at a constantly changing distance, will read low.
The Thermocouple Temperature Probe
The Thermocouple Temperature Probe is a contact probe with a 2.5mm plug. You plug it into one of the probe jacks on the hub and attach the tip firmly to the surface or terminal you want to monitor. The probe reads the temperature right at the point of contact, so good, solid contact is what makes the reading accurate.
The probe is offered in 1 m, 2 m, and 3 m cable lengths, so you can reach a mounting spot without stretching or coiling excess cable. It is the same probe used in the WVC-PRO and the WTH, so if you already run one in another LF Audio system it will work here.
You can connect up to 4 probes to one hub. Each connected probe appears as its own channel on the dashboard.
Secure the probe tip so it stays in full contact with the surface. A probe that is loose, dangling in air, or only lightly touching will read cooler than the part it is meant to measure.
How Channels Are Numbered
The hub organizes its channels the same way every time: the 4 infrared channels come first, named IR 1 through IR 4, followed by the 4 contact channels, named Probe 1 through Probe 4.
Those default names are only a starting point. You can rename any channel to something meaningful for your build, such as "Sub Motor" or "Amp Terminal", using up to 20 characters. Leaving a name blank restores its default. Channel renaming lives on the Channels tab in Settings, covered in Menus and Settings.
A channel only appears on the dashboard when its sensor is connected and actively reading. If a sensor is unplugged, or an infrared sensor loses sight of its target, that channel shows "--" and its tile drops off the screen until the reading returns. See Display and Navigation for how the dashboard tiles behave.
| Non-Contact Infrared | Contact Probe | |
|---|---|---|
| Contact with the target? | No, reads from a short distance | Yes, tip touches the surface |
| Best for | Moving or hard-to-reach parts: subwoofer motors, voice-coil areas, spinning components | Fixed points you can reach: heatsinks, power terminals, battery posts, lugs |
| Sensors per hub | Up to 4 | Up to 4 |
| Product | WTH Infrared Sensor | Thermocouple Temperature Probe |
Getting the Best Readings
A few habits will keep every channel honest:
- Aim infrared sensors squarely. Point the sensor straight at the target, not at a glancing angle. The closer and more head-on it sits, the more accurate the reading.
- Avoid shiny, reflective surfaces with infrared. A bright chrome or polished metal surface reflects heat rather than radiating its own, which throws off a non-contact reading. Aim at a matte or painted area of the part where you can, or use a contact probe on that spot instead.
- Make sure probes have solid contact. For a contact probe, firm, full contact with the surface is everything. Clamp, tape, or fasten the tip so it cannot drift, and check that it is touching the metal and not sitting on paint, a sticker, or an air gap.
- Route the shielded infrared cable away from power. Keep the sensor cable clear of large power and amplifier leads. Running it alongside heavy current can introduce noise, so give it its own path where you can.
The hub raises an over-temperature warning visually only, by recoloring the affected tile and the home-screen status dot. There is no buzzer and no switched output, so keep the display somewhere you can see it, and check it during hard demos.
For where and how to physically mount each sensor and connect it to the hub, see the Installation Guide.