nuLine 284

Safety Instructions

• 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.

nuConnect ampX

Safety Instructions

Before connecting and operating the device, carefully read the user manual and, in particular, its safety instructions. For your own safety, follow all warnings and safety instructions in this manual and on the speaker. Do not perform any actions on the speaker other than those described. Keep this document in a safe place where it is always accessible. Additionally, ensure it is passed on to potential future owners.

Intended Use

This speaker is intended solely 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 installations like those involving specifically IP-certified products) is considered improper and may lead to property damage or even personal injury. Nubert electronic GmbH accepts no liability for damages caused by improper use.

General Notes

Never operate the speaker unattended!

Risk of Suffocation!

Never leave children unsupervised with the speaker or packaging materials! There is a risk of children becoming entangled in the packaging film and suffocating. Ensure that children cannot detach small parts from the device! These parts could be swallowed and cause suffocation. If parts are swallowed, consult a doctor immediately!

Caution!

To avoid the risk of damage to the speaker, do not open it. There are no user-serviceable parts inside the speaker. Service and repairs should only be performed by qualified technicians authorized by Nubert. In case of service, contact Nubert electronic GmbH!

Caution!

Operating the speaker despite damage may cause further malfunctions. If any of the following conditions occur, take the speaker out of operation immediately. Contact Nubert electronic GmbH!

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

Setup Instructions

Risk of Injury or Damage!

When moving the speaker, handle it with care to avoid injuries and damage!

Caution!

An unstable setup location may cause damage to the speaker.

• Place the speaker only on a stable, level surface and ensure it cannot be knocked over!
• Ensure no unintended pull on cables to prevent tipping over the speaker or damaging connectors!
• Keep the speaker free from strong mechanical vibrations!

Caution!

Excessive heat buildup inside the device may shorten its lifespan or cause a fire. Heat exposure to speaker surfaces may also 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 dry environments!
• Do not operate it outdoors or in damp areas!
• Protect the speaker from all kinds 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. Wait at least 6 hours before switching it on, ensuring it has reached room temperature and is completely dry!
• Do not use the speaker during rapid temperature changes!

Setup Instructions

Risk of Injury or Damage!

When moving the speaker, handle it with care to avoid injuries and damage!

Caution!

An unstable setup location may cause damage to the speaker.

• Place the speaker only on a stable, level surface and ensure it cannot be knocked over!
• Ensure no unintended pull on cables to prevent tipping over the speaker or damaging connectors!
• Keep the speaker free from strong mechanical vibrations!

Caution!

Excessive heat buildup inside the device can shorten its lifespan or cause a fire. Heat exposure to speaker surfaces can also 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 areas!
• Protect the speaker from all kinds 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. Wait until the speaker has reached room temperature and is completely dry before switching it on!

Connection Instructions

General Connection Notes

• Unplug the power cords of all system devices before making any changes to the wiring!
• Ensure all connections are correctly made and securely seated before connecting the devices to the power supply!
• Use only the designated cables and connectors for connections! Using improper cables may result in damage or malfunction.
• When disconnecting cables, always pull on the plug, not the cable!
• Ensure all plugs fit securely into their sockets!
• Use only cables and accessories recommended by Nubert!

Caution!

Disconnect your amplifier/receiver from the mains before connecting the speakers! Refer to the amplifier/receiver manual for detailed instructions on connecting speaker cables.

Care and Cleaning Tips

Caution!

Improper handling of the speaker can cause damage.

• Always unplug the speaker before cleaning!
• Ensure the speaker is completely dry, and all connections are correctly made with no short circuits before resuming operation.
• Do not use sharp cleaning agents or solvents such as gasoline, alcohol, or similar!

Housing

We recommend using standard glass cleaner sprayed onto a cotton cloth. This effectively removes fingerprints and dirt. Alternatively, you can use foam-based glass cleaners. Avoid using microfiber cloths, as they may cause micro-scratches on the surface.

Speaker Membranes and Chassis

To remove dust from a speaker chassis, use a lint-free cotton cloth and gently wipe the membrane with very light pressure. The tweeters on all Nubert speakers are equipped with a protective grille, so they can also be wiped gently. If dust cannot be completely removed, a makeup brush from a drugstore is suitable.

Safety Instructions

Before connecting and operating the device, carefully read the user manual and, in particular, its safety instructions. For your own safety, follow all warnings and safety instructions in this manual and on the device. Do not perform any actions on the device other than those described. Keep this document in a safe place where it is always accessible. Additionally, ensure it is passed on to potential future owners.

Intended Use

This device is intended solely for audio playback in dry indoor environments. Use the device only as described in this manual. Any other use (especially safety-critical or medical applications, or outdoor installations involving IP-certified products) is considered improper and may lead to property damage or personal injury. Nubert electronic GmbH accepts no liability for damages caused by improper use.

General Notes

Never operate the device unattended!

Risk of Electric Shock!

To avoid the risk of electric shock, do not open the device. There are no user-serviceable parts inside. Service and repairs should only be performed by qualified technicians authorized by Nubert. In case of service, contact Nubert electronic GmbH directly (info@nubert.de)!

Risk of Suffocation!

Never allow children to use the device or remote control unsupervised, or to play with the packaging! Children may become entangled in packaging film and suffocate. Ensure that children cannot detach small parts from the device, such as batteries from the remote control. If parts are swallowed, consult a doctor immediately!

Risk of Injury or Damage!

When moving the device, handle it carefully to avoid injuries and damage!

Caution!

Since the device can only be completely disconnected from the mains by unplugging the power cord, ensure free access to the power socket or plug at all times. If any of the following conditions occur, switch off the device immediately and unplug it. Contact Nubert electronic GmbH (info@nubert.de):

• The device has been damaged or has fallen.
• The power cable or plug is damaged.
• Objects or liquids have entered the device.
• The device has been exposed to excessive moisture or rain.
• The device does not function properly or shows a significant performance reduction.
• The device emits a burning smell, produces smoke, or makes unusual noises.

Setup Instructions

Caution!

An unstable setup location may cause damage to the device.

• Place the device only on a stable, level surface and ensure it cannot be knocked over!
• Ensure there is no unintended pull on cables to prevent tipping the device or damaging connectors!
• Keep the device free from strong mechanical shocks!

Caution!

Excessive heat buildup inside the device can shorten its lifespan or cause a fire.

• Never cover the device’s ventilation openings! Ensure at least 10 cm of clearance around the device for proper air circulation.
• Do not operate the device near heat sources such as radiators or stoves!
• Do not expose the device to direct sunlight!
• Never place burning candles or open flames on the device!

Risk of Explosion!

Placing the device in unsuitable environments may cause explosions. Do not use the device:

• In fire or explosion-prone areas!
• At extremely low or high temperatures!
• Near flammable gases or vapors!
• In excessively dusty environments!