Redbox RB-HD6 - Headphone amplifier Sonifex - Free user manual and instructions
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| Product Type | Headphone Amplifier |
| Brand | Sonifex |
| Model | Redbox RB-HD6 |
| Number of Channels | 6 |
| Input | Stereo balanced XLR, unbalanced RCA |
| Outputs | 6 x 1/4" stereo headphone jacks |
| Frequency Response | 20 Hz - 20 kHz ±0.5 dB |
| Power Output per Channel | 150 mW into 32 ohms |
| Total Harmonic Distortion (THD) | <0.01% |
| Signal-to-Noise Ratio | >100 dB |
| Dimensions (W x D x H) | 19" x 6.9" x 1.75" (483 x 175 x 44 mm) |
| Weight | 2.5 kg (5.5 lbs) |
| Power Supply | 100-240V AC, 50/60 Hz, internal |
| Power Consumption | 30 W max |
| Front Panel Controls | Individual volume knobs, mute switches |
| Cooling | Convection, fanless |
| Mounting | 19" rack-mountable, 1U |
| Cleaning Instructions | Wipe with dry or slightly damp cloth; do not use solvents. |
| Safety Certifications | CE, RoHS |
| Warranty | 2 years |
Frequently Asked Questions - Redbox RB-HD6 Sonifex
How do I connect the RB-HD6 to my audio source?
Connect your audio source to the balanced XLR or unbalanced RCA inputs on the rear panel. Use a standard stereo cable for best results.
Can I use all six headphone outputs simultaneously?
Yes, each output provides independent amplification and volume control, allowing up to six headphones with individual levels.
What impedance headphones are compatible?
The RB-HD6 works with headphones from 16 to 600 ohms. Lower impedance headphones will produce higher volume.
Is the amplifier suitable for monitoring in a studio?
Absolutely. The low distortion and high signal-to-noise ratio make it ideal for professional studio monitoring and broadcast applications.
How do I clean the RB-HD6?
Disconnect power and wipe the chassis with a soft, dry cloth. For stubborn marks, lightly dampen the cloth with water. Avoid using chemicals.
Does it require any special cooling or ventilation?
No. The unit is fanless and uses convection cooling. Ensure at least 1U of space above and below for airflow.
Can I mount the RB-HD6 in a rack?
Yes, it is a standard 19-inch, 1U rackmount design. Use four screws to secure it in a rack cabinet.
What is the power consumption of the RB-HD6?
Maximum power consumption is 30 watts. It operates on 100-240V AC, 50/60 Hz, so it works worldwide.
How do I troubleshoot if there is no sound?
Check that the input source is active and connected properly. Verify that the volume knobs are turned up and headphones are plugged in fully. Also ensure the mute switch is off.
What is the warranty period?
Sonifex offers a 2-year warranty from the date of purchase covering manufacturing defects.
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