ART Pro Audio Unbalanced-to-Balanced Level Converter

SKU: # 317572   |   Model: # CLEANBOXPRO   |    Product Reviews3 Reviews  Write a Review

Unbalanced-to-Balanced Level Converter

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Unbalanced-to-Balanced Level Converter
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The CLEANBoxPro provides two channels of unbalanced to balanced level conversion and two channels of balanced to unbalanced level conversion in a rugged, compact, and portable unit. Balanced lines offer increased immunity to external electrical noise, such as hum. Since a balanced system minimizes induced noise, it is the preferred method of connecting audio gear, especially when long lengths of cable are used.

One section of the CLEANBoxPro converts two channels of consumer-level unbalanced input signals into two channels of pro line-level balanced output signals. It has two RCA jack inputs and a stereo mini-phone jack input connected in parallel. The balanced output feeds two XLR male jacks.

The other section of the CLEANBoxPro converts two channels of line-level balanced input signals into two channels of consumer unbalanced output signals. It has two XLR female input jacks. The unbalanced output feeds two RCA jacks and a stereo mini-phone jack connected in parallel.

Each section has stereo level controls to optimize signal levels. An LED indicator lights when power is applied.

The CLEANBoxPro can be an invaluable tool in application areas including (but not limited to!): home or professional recording studios, live sound, PA, permanent installs, DJ, AV, consumer HiFi, podcasting and broadcasting. The CLEANBoxPro can be used with: mixers, audio processors, laptop computers, computer sound cards, CD/DVD players, video gaming machines, MP3 player/recorders, powered monitors and digital audio workstations.

• XLR connectors for balanced inputs and outputs
• RCA phono jacks and stereo 1/8" mini-phone jacks for unbalanced inputs and outputs
• Unbalanced output level control
• Balanced output level control
• Rugged extruded aluminum case
• Lighted On/Off switch
• Comes with external power supply for operation with AC mains
• Low noise, low distortion circuitry

• Signal to Noise Ratio: > 90 dB
• Frequency Response: 20Hz to 20kHz, +/-1 dB
• Input Impedance: Balanced - 100 Ohms; Unbalanced - 300 Ohms
• Maximum Gain: Balanced to Unbalanced: -6 dB; Unbalanced to Balanced: +21 dB
• Maximum Input Level: +21 dBu
• Maximum Output Level: Balanced: +21dBu; Unbalanced: +15dBu
• Output Impedance: Balanced: 100 Ohms; Unbalanced: 300 Ohms
• Power Requirements: 7.5-12 V AC/DC,

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Best if used one way at a time 0 of 0 customers found this review helpful
Product Experience   I own it
Closest Store   North York (Steeles), Ontario
Just a quick addition to my earlier review. I had occasion to use both sides of this product at the same time; i.e. both the balanced to unbalanced side for one stereo pair and simultaneously the unbalanced to balanced connection for another. In this application I did hear some crosstalk between the sides, so in future I'll stick to using it EITHER to balance some unbalanced signals OR to take some balanced channels and run them into an unbalanced input, but not both at the same time. I expect there must also be some crosstalk between channels 1 and 2 in the same direction, though I haven't tested this. Nonetheless, I'll stick to using it either for a single mono signal or for a genuine stereo or other signal pair where a tiny bit of crosstalk won't matter. Still a great bit of kit and I'm very happy about this purchase, so just acknowledging those minor limitations.
Posted by Tom on Mar 23, 2024
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Immensely useful little device 0 of 0 customers found this review helpful
Product Experience   I own it
Closest Store   North York (Steeles), Ontario
Just received this flexible little problem solver. I can see it's going to be useful for a range of stage and studio applications, accommodating both balanced input to unbalanced output AND unbalanced input to balanced output. The CLEARBOXPRO also offers wide range of level matching in both directions, with plenty of gain for consumer line level inputs, so it can easily cover the range from consumer to professional level signals plus more, for both inputs and outputs. The unbalanced input has a 100kohm input impedance. That's perfect for connecting, even bridging, a consumer line level output. My immediate use is driving a Sennheiser wireless in-ear monitor system from a variety of sources. With all the connection flexibility, I'll be able to drive it with anything from a professional monitor line out to a Zoom recorder headphone output. Right now I'm playing a smartphone into the 1/8" input. This phone has that European warning about listening at high levels and WILL turn the volume down if you keep it high for what the nanny phone thinks is too long, which then makes the phone's headphone output about 20dB too low for going into a consumer line level input. No problem for the CLEANBOXPRO: it can more than make up for the difference in gain. All that flexibility at this price point makes this little box a terrific value, in my opinion.
Posted by Tom on Feb 7, 2024
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Basic, Solid, Value 3 of 4 customers found this review helpful
Product Experience   I own it
Closest Store   Vancouver, British Columbia
These units are cheap and work in a pinch when you need to go between +4 and -10dB lines in a mixed-signal studio. I have two of these in a radio studio for connecting laptops and iPods to a broadcast console.
Posted by Bob on Oct 9, 2013
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Rental rates

This product is normally available for rental. Please contact your preferred location for further information.

1 Day from $2.00

1 Week $4.00

1 Month $8.00

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A warranty can be a very important factor when making a buying decision. Because repairs can be very expensive in terms of parts and labour costs, manufacturers usually only provide one year limited warranties that generally only cover items that malfunction due to a manufacturer’s defect. With an important purchase such as a musical
instrument or piece of studio gear, however, many people want to have the peace of mind in knowing that their investment will be protected should the product no longer be performing at 100%.

Because of this, Long & McQuade provides our customers with a FREE one-year Performance Warranty on most of our products. The Long & McQuade Performance Warranty supplements the manufacturer’s warranty to ensure that our customers receive complete “no hassle” warranty coverage within their first year.

How does the Long & McQuade Performance Warranty differ from most manufacturers' warranties?
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