Radial J48 MK2 48V Phantom-syötön aktiivinen suoratoistoboksi käyttöohje

1. Johdanto

The Radial J48 MK2 is an active direct box designed to convert unbalanced instrument signals into balanced, low-impedance signals suitable for professional mixing consoles and recording equipment. It operates on 48V phantom power, providing a wide, distortion-free frequency response and dynamic range for various instruments. This manual provides essential information for the proper setup, operation, and maintenance of your J48 MK2.

2. Turvallisuustiedot

Please read and understand all safety instructions before operating this device.

• Ehdotus 65 Varoitus: Tämä tuote voi sisältää kemikaaleja, joiden tiedetään Kalifornian osavaltion aiheuttavan syöpää, syntymävikoja tai muita lisääntymisvaurioita.
• Älä altista laitetta sateelle tai kosteudelle.
• Do not open the chassis; there are no user-serviceable parts inside. Refer all servicing to qualified personnel.
• Varmista laitteen ympärillä oleva asianmukainen ilmanvaihto käytön aikana.
• Use only with 48V phantom power sources as intended.

3. Tuote ohiview

The Radial J48 MK2 is engineered for optimal performance with modern instruments, offering robust construction and transparent audio conversion. Its features include a unique switch-mode power supply for high rail voltage, ensuring signal integrity even with dynamic sources.

Tärkeimmät ominaisuudet:

• Active 48-Volt phantom powered operation.
• High rail voltage to prevent clipping with powerful instruments.
• Low inter-modulation distortion for clear audio.
• Innovative merge function for stereo-to-mono summing.
• 80Hz high-pass roll-off filter to reduce low-frequency rumble.
• Rugged alloy steel construction for durability.

Ohjaimet ja liittimet:

• TULO (6,35 mm:n jakki): Connect your instrument or audio source here.
• LÄPI (1/4" liitin): Provides a direct, unprocessed signal to feed an instrument ampelevaattori tai näyttö.
• -15dB PAD Switch: Attenuates the input signal by 15dB for high-output sources, preventing overload.
• 48V Phantom Check LED: Illuminates momentarily when 48V phantom power is detected.
• MERGE Button: Combines the LEFT and RIGHT 1/4" inputs into a mono signal, sent to the XLR output.
• BALANCED OUTPUT (XLR): Provides a balanced, low-impedance output signal to a mixing console or audio interface.
• 180° POLARITY FLIP Switch: Reverses the polarity of the XLR output signal, useful for phase correction.
• LOW-CUT (-6dB@80Hz) Switch: Activates an 80Hz high-pass filter to reduce unwanted low-frequency rumble or mud.
• MAANOSTOkytkin: Disconnects the audio ground from the chassis ground to eliminate hum and buzz caused by ground loops.

4. Asennus

Follow these steps to connect your Radial J48 MK2:

1. Liitä instrumentti: Plug your instrument (e.g., guitar, bass, keyboard) into the INPUT 1/4" jack on the J48 MK2.
2. Yhdistä Ampnostolaite (valinnainen): If you wish to send your instrument's signal to an on-stage amplifier or monitor, connect a 1/4" cable from the KAUTTA jack on the J48 MK2 to your amplifier'in panos.
3. Connect to Mixer/PA: Connect a balanced XLR cable from the TASAPAINOTETTU LÄHTÖ of the J48 MK2 to an XLR input on your mixing console or audio interface.
4. Aktivoi fantomivoima: Ensure that the connected mixing console or audio interface provides 48V phantom power to the XLR input. The 48V Phantom Check LED on the J48 MK2 will briefly illuminate to confirm power reception. The J48 MK2 requires 48V phantom power for operation.

5. Käyttöohjeet

Optimize your sound using the J48 MK2's controls:

• Using the -15dB PAD: If your instrument has a very high output (e.g., active pickups, high-output keyboards), engage the -15dB PAD switch. This reduces the input signal level, preventing distortion and ensuring a clean signal to the mixer.
• MERGE Function: For instruments with stereo outputs (e.g., some keyboards or media players) that you want to sum to a single mono XLR output, press the YHDISTÄÄ button. Connect the left output to the INPUT jack and the right output to the THRU jack. The J48 MK2 will then combine these into a mono signal at the XLR output.
• POLARITY FLIP (180°): In multi-microphone or multi-DI setups, phase cancellation can occur, leading to a thin or hollow sound. If you suspect phase issues, engage the 180° POLARITY FLIP switch to invert the phase of the XLR output. Listen for an improvement in low-end response or overall clarity.
• LOW-CUT Filter: To reduce unwanted low-frequency noise, stage rumble, or to clean up the low-end of an instrument's signal, engage the MATALAINEN switch. This activates an 80Hz high-pass filter, removing frequencies below 80Hz.
• MAAHISTA: If you experience hum or buzz in your audio signal, it may be due to a ground loop. Engage the MAATALOITUS switch to disconnect the audio ground from the chassis ground. If the hum persists, try disengaging it, as sometimes lifting the ground can introduce noise in certain setups.

6. Huolto

The Radial J48 MK2 is built for durability and requires minimal maintenance.

• Puhdistus: Puhdista laitteen ulkopinta pehmeällä, kuivalla liinalla. Vältä hankaavia puhdistusaineita tai liuottimia.
• Varastointi: Säilytä laitetta kuivassa paikassa, poissa äärimmäisistä lämpötiloista ja suorasta auringonvalosta.
• Tarkastus: Tarkista kaapelit ja liittimet säännöllisesti kulumisen tai vaurioiden varalta.

There are no user-serviceable parts inside the J48 MK2. Any internal servicing should be performed by authorized Radial Engineering technicians.

7. Vianmääritys

If you encounter issues with your J48 MK2, refer to the following common problems and solutions:

• Ei ääntä:
  • Ensure 48V phantom power is active on the mixer's XLR input. The 48V Phantom Check LED should briefly flash upon connection.
  • Check all cable connections (instrument to INPUT, J48 OUTPUT to mixer).
  • Verify the instrument is working and its volume is up.
  • Ensure the mixer channel is unmuted and its gain is appropriately set.
• Hurina tai surina:
  • Kytke tai irti MAATALOITUS switch to break potential ground loops.
  • Varmista, että kaikki laitteet on maadoitettu oikein.
  • Tarkista vialliset kaapelit.
• Vääristynyt ääni:
  • Ota yhteyttä -15dB PAD kytkin, jos soittimessasi on korkea lähtötaso.
  • Reduce the input gain on your mixing console.
  • Check for damaged cables or faulty equipment.
• Thin or Hollow Sound:
  • If using multiple microphones or DIs, try engaging the 180° POLARITY FLIP switch to correct phase issues.

If problems persist, contact Radial Engineering support for further assistance.

8. Tekniset tiedot

9. Takuu ja tuki

For warranty information, technical support, or service inquiries, please contact Radial Engineering directly through their official websivustolta tai valtuutetuilta jälleenmyyjiltä. Säilytä ostokuitti ostotodistuksena takuuvaatimuksia varten.