CAUTION

To completely disconnect this device from the power supply, please unplug the power cord from the wall outlet. The power plug is used to completely disconnect the device from the power supply; it must remain easily accessible for the user.

WARNINGS

• Avoid high temperatures. Ensure proper ventilation if the device is placed on a shelf.
• Handle the power cord carefully. Always hold the plug when unplugging the cord.
• Keep the device away from moisture, water, and dust.
• If the device will not be used for an extended period, disconnect the power cord from the outlet.
• Do not cover the ventilation area.
• Do not allow foreign objects to enter the device.
• Keep the device away from insecticides, gasoline, or thinners.
• Never attempt to disassemble or modify the device.
• Ensure ventilation is not obstructed by objects such as newspapers, tablecloths, curtains, etc.
• Do not place any open flames, such as lit candles, on the device.
• Please follow local environmental regulations when disposing of batteries.
• The device must not be exposed to dripping or splashing liquids.
• Do not place any containers filled with liquid, such as vases, on the device.
• Do not handle the power cord with wet or damp hands.
• When the switch is in the OFF-STANDBY position, the device is not completely disconnected from the mains.
• The device should be positioned near a power outlet to ensure easy access to the power supply.
• Do not store the battery in a location exposed to direct sunlight or extremely high temperatures, such as near a heater.
• Do not forcibly bend the plug when connecting the device and the micro-USB/USB cable.

CAUTION (For Amplifiers): Hot Surface. Do Not Touch.

The surface above the internal heatsink may become hot when this product is operated for extended periods. Do not touch hot areas, particularly near the "Hot Surface Mark" and on the top surface.

Before connecting and operating the device, carefully read the user manual, particularly the safety instructions. For your own safety, strictly observe all warning and safety notices in this manual and on the speaker. No work on the speaker other than the actions described here should be performed by the user. Keep this document accessible at all times and hand it over to any future owners.

Intended Use

This speaker is designed exclusively for audio playback in dry indoor environments. Use the speaker only as described in this manual. Any other use (especially safety-critical or medical applications, outdoor installation like specifically IP-certified products) is considered improper and may result in property damage or personal injury. Nubert electronic GmbH accepts no liability for damages resulting from improper use.

General Notes

Never operate the speaker unattended!

Risk of suffocation!

Never allow children to use the speaker unattended or play with its packaging! There is a risk that children may become entangled in the packaging film and suffocate. Ensure that children cannot detach small parts from the devices! These parts could be swallowed, leading to choking hazards. In case of ingestion, contact a doctor immediately!

Caution!

To avoid the risk of property damage, the speaker must not be opened by the operator. There are no user-serviceable parts inside the speaker. Maintenance and repairs should be performed only by authorized, qualified professionals from Nubert. In case of service needs, contact Nubert electronic GmbH directly!

Caution!

If the speaker is operated despite damage, further defects may occur. If any of the following conditions arise, immediately discontinue use of the speaker and contact Nubert electronic GmbH:

• The speaker has been damaged or has fallen.
• Objects or foreign substances have entered the device.
• The speaker emits a burning smell, smoke, or unusual noises.

Placement Instructions

Risk of injury or damage!

Move the speaker with care to avoid injuries or damage!

Caution!

An unstable placement location can lead to damage to the speaker.

• Place the speaker on a level, stable surface and ensure it cannot be tipped over!
• Ensure that no accidental tension is applied to the cables to prevent the speaker from tipping over or damaging the connection ports!
• Keep the speaker away from strong mechanical shocks!

Caution!

Excessive heat build-up inside the device can shorten its lifespan or lead to a fire. Heat exposure on the speaker surfaces can cause damage.

• Do not operate the speaker near heat sources such as radiators or stoves!
• Do not expose the speaker to direct sunlight!
• Never place burning candles or similar open flames on the speaker!

Caution!

Moisture can damage the speaker.

• Use the speaker only in a dry environment!
• Do not operate it outdoors or in damp rooms!
• Protect the speaker from all types of liquids, including dripping or splashing water.
• Do not place containers with liquids (e.g., flower vases) on or near the speaker!
• If the speaker is brought from a cold environment into a warm room, condensation may form inside the device. Wait at least 6 hours before turning it on to ensure it has reached room temperature and is dry!
• Do not use the speaker during rapid temperature changes!

Placement Instructions

Risk of injury or damage!

Move the speaker with care to avoid injuries or damage!

Caution!

An unstable placement location can lead to damage to the speaker.

• Place the speaker on a flat, stable surface and ensure it cannot be knocked over!
• Make sure there is no unintended tension on the cables to prevent the speaker from tipping over or damaging the connection ports!
• Keep the speaker away from strong mechanical shocks!

Caution!

Excessive heat buildup inside the device can shorten its lifespan or lead to a fire. Heat exposure on the speaker surfaces can cause damage.

• Do not operate the speaker near heat sources such as radiators or stoves!
• Do not expose the speaker to direct sunlight!
• Never place burning candles or similar open flames on the speaker!

Caution!

Moisture can damage the speaker.

• Use the speaker only in a dry location!
• Do not operate it outdoors or in damp rooms!
• Protect the speaker from any liquids, including dripping or splashing water.
• Do not place containers with liquids (e.g., flower vases) on or near the speaker!
• If the speaker is brought from a cold environment into a warm room, condensation may form inside the device. Wait until the speaker reaches room temperature and is dry before turning it on!

Connection Instructions

General Connection Instructions

• Unplug all devices in your system from the power supply before making any wiring changes!
• Ensure that all connections are made correctly and that all plugs are firmly seated in their sockets before reconnecting the devices to the power supply!
• Only use the designated cables and connectors for connections! Otherwise, damage or malfunctions may occur.
• When disconnecting the speaker, always pull on the plug, not the cable!
• Ensure that all plugs are securely seated in their sockets!
• Only use cables and accessories recommended by Nubert!

Caution!

Disconnect your amplifier/receiver from the power supply before connecting your speakers! Refer to the amplifier/receiver's user manual for instructions on connecting speaker cables.

Care and Cleaning Tips

Caution!

Improper handling of the speaker may cause damage.

• Always unplug the power cord before cleaning the speaker!
• Ensure that all connections are correct, there are no short circuits, and the speaker is completely dry before resuming operation.
• Do not use harsh cleaning agents or solvents such as gasoline, alcohol, or similar substances!

Housing

We recommend using a standard glass cleaner sprayed onto a cotton cloth. This allows most fingerprints and dirt to be removed easily. Alternatively, you can use window active foam. We advise against using microfiber cloths as they may cause micro-scratches on the surface.

Membranes and Speaker Drivers

To remove dust from a speaker driver, use a lint-free cotton cloth and gently wipe the membrane with very light pressure. All Nubert speakers' tweeters are protected by a grille, which can also be wiped lightly with minimal pressure. If the dust cannot be completely removed, a makeup brush from the drugstore can be used.

nuLine 284

• Turn off the amplifier before connecting the speaker cables.
• Ensure the speaker cables are securely connected.
• Place the speakers only in a dry location.
• Do not expose the speakers to direct sunlight.
• Overloading: The nuLine 284 features internal fuses to protect against amplifier overload. However, note that even a weak amplifier can endanger a speaker. At high volumes, weak amplifiers tend to distort, which places extreme stress on the tweeters. If the sound becomes distorted at a certain volume level, reduce the amplifier's volume setting.
• Tipping Hazard: Due to its slim design, the nuLine 284 is at risk of tipping sideways. It should never be used without the supplied traverse feet.

Cold Weather and Sound

If speakers are shipped and delivered during the cold season, they must acclimate to room temperature. Low temperatures significantly affect the moving parts of a speaker box, such as the diaphragm/voice coil, surround, and spider. These components' ability to follow rapid vibrations or make large excursions is severely limited. While not dangerous, “deep-frozen” speakers will not perform at their best acoustically. Our advice: If your new speakers arrive on a cold winter day, give them a few hours to acclimate. Your Nubert speakers will reward you with the outstanding sound quality you rightly expect from us.

Caution!

The threaded sockets are for mounting the traverse feet only! They are not designed for tensile loads and must not be used to attach hooks or similar devices for hanging the speakers.

Connection Instructions

Ensure that your amplifier/receiver is turned off before connecting the speakers. Refer to your amplifier/receiver's user manual for specific connection instructions.

Care and Cleaning Tips

Caution!

Improper handling of the speaker may result in damage.

• Turn off your amplifier before cleaning the speaker and disconnect the speaker cables from the terminal if necessary.
• Before resuming operation, ensure that all connections are correct, no short circuits exist, and the speaker is completely dry.
• Never use harsh cleaning agents or solvents such as gasoline, alcohol, or similar substances.

Cabinet

We recommend using a standard glass cleaner sprayed onto a cotton cloth for cleaning. This will effectively remove most fingerprints and dirt. Alternatively, you can use window cleaning foam. Avoid using microfiber cloths as they may cause micro-scratches. For veneered cabinets, we recommend using appropriate furniture care products.

Membranes and Speaker Drivers

Use a lint-free cotton cloth with gentle pressure to remove dust from the speaker driver. The tweeters in all Nubert speakers are protected by a grille and can also be gently wiped clean. For stubborn dust, a makeup brush from a drugstore can be used.

Bi-Amping

Caution!

Do not forget to remove the bridges on the connection terminal! The principle of separate signal supply for bass/midrange and treble areas leads to bi-amping (bi-amping = dual amplifier). This relatively elaborate method requires a preamplifier that can connect to two stereo power amplifiers: one for the bass/midrange and the other for the treble. Bi-amping is intended to provide better driver control and improved precision. However, the effort and results should be carefully considered.

Technics SU-GX70EG