ART CleanBox Pro
MRP - Rs. 8,907
ART CleanBox Pro: two channel balanced / unbalanced level convertor with XLR, RCA and 1/8 inch jacks, separate output level controls, adaptor included. Available in India from Shivansh Electronics, Kolkata, West Bengal, India.
VISUAL GUIDE — See Every Photo, Spec & Setup Step (PDF)
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Specifications
| Inputs | 2 x XLR balanced (+4 dBu); stereo RCA and 1/8 inch unbalanced (-10 dBV) |
| Outputs | 2 x XLR balanced (+4 dBu); stereo RCA and 1/8 inch unbalanced (-10 dBV) |
| Frequency response | 20 Hz to 20 kHz, ±1 dB |
| Signal to noise ratio | > 90 dB |
| Total harmonic distortion | < 0.1 % at 1 kHz |
| CMRR | > 40 dB |
| Input impedance | Balanced 20 kΩ; unbalanced 100 kΩ |
| Output impedance | Balanced 100 Ω; unbalanced 300 Ω |
| Maximum gain | Balanced to unbalanced -6 dB; unbalanced to balanced +21 dB |
| Maximum input level | +21 dBu |
| Maximum output level | Balanced +21 dBu; unbalanced +15 dBu |
| Power requirements | 7.5‑12 V AC/DC, < 150 mA (power adaptor included) |
Physical
| Case | Rugged extruded aluminium |
| Dimensions (H x W x D) | 11.4 x 7.3 x 3.8 cm (4.5 x 2.875 x 1.5 inch) |
| Weight | 408 g (0.9 lb) |
Product overview
The ART CleanBox Pro is a two channel balanced / unbalanced level convertor: a convenient solution for connecting consumer A/V and professional audio equipment.
It provides two channels of unbalanced to balanced level conversion and two channels of balanced to unbalanced level conversion in a rugged, compact and portable extruded aluminium case. The balanced signals use XLR connectors, the unbalanced signals use stereo RCA and 1/8 inch TRS jacks, and independent volume controls set the balanced and unbalanced output levels. Balanced lines offer increased immunity to external electrical noise and hum, and are the preferred method of connecting audio gear, especially over long cable runs. Need to get the analogue output from a laptop, phone or disc player to a mixer or PA system, or the other way round? The CleanBox Pro does it. Note that it is a level convertor, not a transformer isolator.
| Channels: unbalanced to balanced and back | 2 + 2 |
| Balanced XLR inputs and outputs | +4 dBu |
| Unbalanced RCA and 1/8 inch | -10 dBV |
| Signal to noise ratio | > 90 dB |
Key features
- 2 channel balanced / unbalanced level convertor
- 2 x XLR inputs and outputs
- Stereo RCA and 1/8 inch inputs and outputs
- Independent level controls for balanced / unbalanced outputs
- Power adaptor included
- Rugged extruded aluminium case with a lighted on / off switch
- Low noise, low distortion circuit
Unbalanced to balanced
One section converts two channels of consumer level unbalanced signals into two channels of professional line level balanced signals. Its -10 dBV inputs are two RCA jacks and a stereo 1/8 inch mini-phone jack connected in parallel; the +4 dBu balanced outputs are two male XLR jacks, set by the Balanced Stereo Output Level control (up to +21 dB of gain).
Balanced to unbalanced
The other section converts two channels of line level balanced signals into two channels of consumer unbalanced signals. It has two female XLR inputs (+4 dBu); the -10 dBV outputs are two RCA jacks and a stereo 1/8 inch mini-phone jack connected in parallel, set by the Unbalanced Stereo Output Level control.
Applications
ART names home and professional recording studios, live sound, PA, permanent installations, DJ, AV, consumer hi-fi, podcasting and broadcasting, with mixers, audio processors, laptop computers, computer sound cards, CD / DVD players, gaming machines, MP3 players / recorders, powered monitors and digital audio workstations. Looping one section's outputs back to its inputs also gives an inline level / gain control.
In the box
- CleanBox Pro level convertor
- External power adaptor
ART CleanBox Pro: frequently asked questions
What does the CleanBox Pro convert?
Two channels of -10 dBV unbalanced (RCA or 1/8 inch) to +4 dBu balanced XLR, and two channels of +4 dBu balanced XLR to -10 dBV unbalanced.
Is it a ground loop isolator?
No. The CleanBox Pro is a level convertor, not a transformer isolator.
How is it powered?
By the included power adaptor: 7.5-12 V AC/DC, less than 150 mA.
Can both sections be used at the same time?
Yes. The two sections are independent, each with its own stereo output level control.
Where can I buy the ART CleanBox Pro in India?
The ART CleanBox Pro is available from Shivansh Electronics, Kolkata, West Bengal, India, with delivery across India.
Workflow 1: Laptop or phone into a mixer
Presenters, DJs and venues.
Connections
| Connect | To |
|---|---|
| Laptop or phone headphone output | Unbal Input (1/8 inch) |
| Balanced Output 1 and 2 (XLR) | Two mixer inputs |
Setup
- Connect the source to the 1/8 inch or RCA input.
- Connect the XLR outputs to the mixer with balanced XLR cables.
- Set the Balanced Output Level.
Tip: Balanced lines resist noise and hum over long cable runs.
Workflow 2: CD or DVD player into a PA system
Halls, schools and events.
Connections
| Connect | To |
|---|---|
| Player RCA outputs | Unbalanced Input 1 and 2 (RCA) |
| Balanced outputs | PA amplifier or mixer |
Setup
- Connect left and right RCA outputs.
- Adjust the Balanced Output Level for best signal strength and clarity.
Tip: The RCA and 1/8 inch inputs are wired in parallel.
Workflow 3: Mixer output to a consumer recorder
Recording a live mix.
Connections
| Connect | To |
|---|---|
| Mixer balanced outputs | Balanced In 1 and 2 (XLR) |
| Unbalanced Output (RCA or 1/8 inch) | Recorder or computer line input |
Setup
- Connect the mixer's XLR outputs.
- Connect the -10 dBV outputs to the recorder.
- Set the Unbalanced Output Level.
Tip: Both unbalanced output jacks carry the same signal.
Workflow 4: Feeding a hi-fi or home system from pro gear
AV installations and showrooms.
Connections
| Connect | To |
|---|---|
| Processor balanced outputs | Balanced In (XLR) |
| RCA outputs | Hi‑fi amplifier input |
Setup
- Connect the balanced feed.
- Match the level with the Unbalanced Output Level control.
Tip: The convertor brings +4 dBu professional level down to -10 dBV consumer level.
Workflow 5: Podcast and broadcast desks
Podcasters and small studios.
Connections
| Connect | To |
|---|---|
| Console balanced output | Balanced In |
| Unbalanced Output | Computer sound card |
| Computer output | Unbalanced Input |
| Balanced Output | Console line inputs |
Setup
- Use both sections at once: one to the computer, one back to the console.
- Set each section's level independently.
Tip: Each section has its own stereo level control.
Workflow 6: Inline level control
Systems needing a simple level control.
Connections
| Connect | To |
|---|---|
| Unbalanced outputs | Unbalanced inputs (loop) |
Setup
- Loop the unbalanced outputs to the unbalanced inputs for an inline balanced level / gain control.
- Or loop the balanced outputs to the balanced inputs for an inline unbalanced level control.
Tip: Power the unit with the included adaptor; the LED shows when power is applied.
