Uvod
The Focusrite ISA 428 MK2 is a high-quality 4-channel microphone preamplifier designed for professional audio recording environments. It features Focusrite's renowned transformer-based preamps, offering exceptional sonic clarity and versatility. This manual provides essential information for the setup, operation, maintenance, and troubleshooting of your ISA 428 MK2.
Figure 1: Front panel of the ISA 428 MK2, showing four input channels with controls and metering.
Nastavitev
Proper setup ensures optimal performance and longevity of your ISA 428 MK2. Follow these steps for initial installation:
- Razpakiranje: Carefully remove the ISA 428 MK2 from its packaging. Retain all packaging materials for future transport or storage.
- Montaža na stojalo: The ISA 428 MK2 is designed for standard 19-inch rack mounting. Secure the unit using appropriate rack screws. Ensure adequate ventilation around the unit.
- Napajalni priključek: Connect the supplied power cord to the IEC inlet on the rear panel of the unit and then to a grounded AC power outlet. The unit operates on Corded Electric power.
- Avdio povezave:
- Vhodi za mikrofon: Connect microphones to the XLR inputs on the rear panel.
- Line/Instrument Inputs: Use the 1/4" jack inputs for line-level signals or direct instrument connections.
- Izhodi: Connect the XLR outputs to your audio interface, mixer, or recording device.
- Vstavi točke: Utilize the dedicated insert points for integrating external signal processors like compressors or EQs.
Figure 2: Rear panel of the ISA 428 MK2, illustrating the various audio input and output connections.
Navodila za uporabo
The ISA 428 MK2 offers precise control over your audio signals. Familiarize yourself with the following operational aspects:
Nadzor pridobitve
Each channel features a versatile gain range from 0dB to +60dB, with an additional 20dB variable trim. Adjust the gain knob to achieve optimal signal levels without clipping. Monitor the input level meters to prevent overload.
Nadzor impedance
The ISA 428 MK2 allows you to tailor the preamp to your microphone with selectable impedance options: 600, 1400, 2400, and 6800 Ohms. Experiment with different impedance settings to find the optimal match for your microphone, which can significantly affect its tonal character and performance.
Fantomsko napajanje (48V)
Engage the 48V phantom power switch for condenser microphones that require external power. Ensure the microphone is connected before activating phantom power to prevent damage.
Visokopropustni filter
Each channel includes a high-pass filter to remove unwanted low-frequency rumble or noise. Activate this filter when recording sources prone to such issues, like vocals or acoustic instruments in a live room.
Merjenje
The front panel features clear LED metering for each channel, allowing you to visually monitor input and output levels and prevent digital clipping.
Slika 3: Pod kotom view of the ISA 428 MK2, providing a clearer perspective of the front panel controls and indicators.
Vzdrževanje
To ensure the longevity and optimal performance of your ISA 428 MK2, follow these maintenance guidelines:
- Čiščenje: Use a soft, dry cloth to clean the exterior of the unit. Avoid abrasive cleaners or solvents, which can damage the finish.
- Prezračevanje: Ensure that the ventilation slots are clear of dust and obstructions to prevent overheating.
- Shranjevanje: Ko enote dalj časa ne uporabljate, jo shranite na hladnem in suhem mestu, idealno v originalni embalaži ali zaščitnem etuiju.
- Ugasniti: Pred čiščenjem ali kakršnim koli vzdrževanjem vedno izklopite enoto in jo odklopite iz električnega omrežja.
Odpravljanje težav
If you encounter issues with your ISA 428 MK2, refer to the following common troubleshooting steps:
| Težava | Možen vzrok | rešitev |
|---|---|---|
| Brez moči | Napajalni kabel odklopljen; Okvara vtičnice; Pregorela varovalka enote. | Check power cable connection; Try a different outlet; Consult a qualified technician for fuse replacement. |
| Ni zvočnega izhoda | Incorrect cabling; Gain set too low; Phantom power not engaged for condenser mics; Output device issues. | Verify all audio cables are correctly connected; Increase gain; Activate 48V phantom power if needed; Check your audio interface/mixer settings. |
| Popačen zvok | Input signal too hot (clipping); Faulty cable; Microphone impedance mismatch. | Reduce input gain; Try a different cable; Adjust impedance setting on the ISA 428 MK2. |
| Brnenje ali hrup | Ground loop; Faulty cable; External interference. | Ensure all equipment is properly grounded; Try different cables; Isolate the unit from other electronic devices. |
If the problem persists after attempting these solutions, please contact Focusrite customer support.
Specifikacije
Detailed technical specifications for the Focusrite ISA 428 MK2:
- Model: 428MKII
- Kanali: 4 Predhodni mikrofonamps
- Razpon ojačanja: 0dB to +60dB (Mic), +20dB variable trim
- Vhodna impedanca: Selectable (600, 1400, 2400, 6800 Ohms)
- Povezljivost: XLR Mic Inputs, 1/4" Line/Instrument Inputs, XLR Outputs, Insert Points
- THD+N: As low as 0.0009%
- Dimenzije (izdelek): 25 x 17.4 x 8.9 palcev
- Teža (izdelek): 12.1 funtov
- vir energije: Električni na kabel
- Montaža: 19" Rack-mountable
Informacije o garanciji
The Focusrite ISA 428 MK2 comes with a 2-year Focusrite warranty. This warranty covers defects in materials and workmanship under normal use. Please retain your proof of purchase for warranty claims. For full terms and conditions, refer to the official Focusrite webspletno mesto ali se obrnite na njihovo podporo.
Podpora in kontakt
For further assistance, technical support, or to register your product, please visit the official Focusrite webspletno mesto:
You can also find additional resources, FAQs, and driver downloads on their support pages.