Q: Where is the fuse of the HK AUDIO Premium PR:O 18 Sub A located and how can I check it?

Fuse location: The fuse is located on the back panel of the subwoofer, usually near the power input. You will need to locate the fuse holder (small rectangular bay) which is clearly marked on the device. Type and specifications: The HK AUDIO Premium PR:O 18 Sub A uses a fuse of type IEC127 (5x20mm) . Check the amperage indicated on your device - it is usually written next to the fuse holder. How to check the fuse: Completely turn off the device and unplug it from the power source Locate the fuse holder on the back panel Gently open the fuse holder (turn or slide depending on the model) Examine the fuse: if it is blackened or the internal filament is broken, it needs to be replaced ONLY use an IEC127 fuse of the correct amperage - never patch or short-circuit the fuse holder Important: The fuse replacement should only be performed by qualified personnel. If you are unsure, contact HK AUDIO technical service or an authorized technician to avoid damaging your device.

Q: Where is the fuse of the HK AUDIO Lucas Nano 602 and how do I replace it?

The fuse of the HK AUDIO Lucas Nano 602 is located at the back of the subwoofer, in the device housing near the power socket . It is directly accessible via the power connector. Fuse Specifications Type: IEC127 (5x20 mm) Replacement: Must be performed only by qualified personnel Important Points Use only IEC127 (5x20 mm) fuses - no other size is compatible Prohibition: Never use homemade fuses or short-circuit the fuse holder In case of problems (device does not start, LED off or red), first check that the fuse is not blown before contacting HK Audio technical service

Q: How to connect two Polar 12 speakers via Bluetooth for a stereo setup?

The Polar 12 does not support Bluetooth pairing between two speakers . The Bluetooth connection (5.0) is reserved for audio transmission from a single source device (phone, tablet, computer). If you want to set up two Polar 12 in stereo , you need to use wired connections via the balanced XLR inputs : Connect the left channel output of your audio source to the XLR/Jack input of the first Polar 12 Connect the right channel output of your audio source to the XLR/Jack input of the second Polar 12 Synchronize the DSP settings on both systems: identify the same Mode (Music, Voice, or DJ), the same EQ settings (Hi, Mid, Low), and the same delay for acoustic consistency Use the delay-line function (configurable up to 100 m in increments of 0.25 m) if one of the two speakers needs to be acoustically delayed You can also combine a Polar 12 with a Polar 10 in stereo, with bass compensation via the Sub potentiometer and the equalizer if necessary.

Q: What does the red LED on the subwoofer mean?

On your HK AUDIO Linear 5 MK II 115 Sub A subwoofer, the red LED is the indicator for limiter intervention and input signal saturation. Meaning based on behavior: Brief and intermittent red blinking: The limiter is normally intervening on level peaks. This is correct operation that protects your subwoofer. Red LED permanently on: The input level is too high and is saturating. You need to reduce the input level to avoid continuous signal limiting. Under normal conditions, the LED remains green (audio signal detected without issue) or briefly blinks red (momentary signal peaks). A steady green LED indicates that an audio signal is present at the input.

Question 1

Where is the fuse of the HK AUDIO Premium PR:O 18 Sub A located and how can I check it?

Accepted Answer

Fuse location: The fuse is located on the back panel of the subwoofer, usually near the power input. You will need to locate the fuse holder (small rectangular bay) which is clearly marked on the device.

Type and specifications: The HK AUDIO Premium PR:O 18 Sub A uses a fuse of type IEC127 (5x20mm). Check the amperage indicated on your device - it is usually written next to the fuse holder.

How to check the fuse:

Completely turn off the device and unplug it from the power source
Locate the fuse holder on the back panel
Gently open the fuse holder (turn or slide depending on the model)
Examine the fuse: if it is blackened or the internal filament is broken, it needs to be replaced
ONLY use an IEC127 fuse of the correct amperage - never patch or short-circuit the fuse holder

Important: The fuse replacement should only be performed by qualified personnel. If you are unsure, contact HK AUDIO technical service or an authorized technician to avoid damaging your device.

Question 2

Where is the fuse of the HK AUDIO Lucas Nano 602 and how do I replace it?

Accepted Answer

The fuse of the HK AUDIO Lucas Nano 602 is located at the back of the subwoofer, in the device housing near the power socket. It is directly accessible via the power connector.

Fuse Specifications

Type: IEC127 (5x20 mm)
Replacement: Must be performed only by qualified personnel

Important Points

Use only IEC127 (5x20 mm) fuses - no other size is compatible
Prohibition: Never use homemade fuses or short-circuit the fuse holder
In case of problems (device does not start, LED off or red), first check that the fuse is not blown before contacting HK Audio technical service

Question 3

How to connect two Polar 12 speakers via Bluetooth for a stereo setup?

Accepted Answer

The Polar 12 does not support Bluetooth pairing between two speakers. The Bluetooth connection (5.0) is reserved for audio transmission from a single source device (phone, tablet, computer).

If you want to set up two Polar 12 in stereo, you need to use wired connections via the balanced XLR inputs:

Connect the left channel output of your audio source to the XLR/Jack input of the first Polar 12
Connect the right channel output of your audio source to the XLR/Jack input of the second Polar 12
Synchronize the DSP settings on both systems: identify the same Mode (Music, Voice, or DJ), the same EQ settings (Hi, Mid, Low), and the same delay for acoustic consistency
Use the delay-line function (configurable up to 100 m in increments of 0.25 m) if one of the two speakers needs to be acoustically delayed

You can also combine a Polar 12 with a Polar 10 in stereo, with bass compensation via the Sub potentiometer and the equalizer if necessary.

Question 4

How do I connect the L SUB 1800 A subwoofer to my satellite speakers?

Accepted Answer

Wiring and Connection

The HK AUDIO L SUB 1800 A subwoofer has several balanced XLR inputs/outputs for easy connection:

Input L/R Inputs - Electronically balanced XLR/jack combo input sockets to receive the audio signal from your mixer or amplifier
Line Out Mid/High Outputs - Two dedicated XLR outputs for connecting active LINEAR satellite speakers
Thru L/R Outputs - Parallel outputs to extend the signal to other speakers
Mains Input - Power socket with V-Lock locking and grounding

Connection Steps

Plug the XLR cables from your audio source (mixer, amplifier) into the Input L/R sockets
Connect your active LINEAR speakers to the Line Out Mid/High outputs using XLR cables
Connect the power cord to the Mains input (socket with provided ground)
Before powering on, set the Gain Bass potentiometer to the center position
First turn on all components except the satellites, then activate the speakers last

Important: Active LINEAR speakers must always be connected to the Line Out Mid/High sockets and powered on after all other components to avoid pops and damage.

Question 5

What does the red LED on the subwoofer mean?

Accepted Answer

On your HK AUDIO Linear 5 MK II 115 Sub A subwoofer, the red LED is the indicator for limiter intervention and input signal saturation.

Meaning based on behavior:

Brief and intermittent red blinking: The limiter is normally intervening on level peaks. This is correct operation that protects your subwoofer.
Red LED permanently on: The input level is too high and is saturating. You need to reduce the input level to avoid continuous signal limiting.

Under normal conditions, the LED remains green (audio signal detected without issue) or briefly blinks red (momentary signal peaks). A steady green LED indicates that an audio signal is present at the input.

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