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Rolls MB15b Promatch 2-Way Stereo Converter

B&H # ROMB15B MFR # MB15B
Rolls MB15b Promatch 2-Way Stereo Converter

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Product Highlights

  • XLR and RCA Connectors
  • 3.5mm Input
  • Line Level Control

You Pay: $56.95

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The Rolls MB15b ProMatch is an inexpensive line level audio device that converts consumer level stereo RCA signals to balanced XLR professional line level signals, and vice versa. The unit is useful for video duplication and audio recording studio applications; for example, connecting a consumer VCR to a professional video deck, or an off-the-shelf CD player to a professional mixing console or recorder.

The MB15b ProMatch has 2 XLR inputs and stereo RCA outputs on one side, labeled 1, and stereo RCA inputs and 2 XLR outputs on the other side, labeled 2. Each side has stereo level controls, and an LED indicates that power is applied to the unit.

Additionally, the unit functions as a balanced XLR line level control. By adding a stereo pair of jumper cables between the 4 RCA jacks (connecting ins to outs), the level controls may be inserted into any balanced XLR line.

Bidirectional line level audio signal converter and stereo direct box converts from consumer to professional and professional to consumer levels
Allows for connection of consumer level products such as camcorders, CD and cassette players to professional level recorders, mixing consoles and signal processors
Standard stereo XLR and RCA connectors, dedicated stereo level control knobs for inputs and outputs
Double duty functionality as balanced inline level control, achieved by patching RCA inputs and outputs together
Maximum Input Level Balanced: +22 dB
Unbalanced: +22 dB
Maximum Output Level Balanced: +18 dB
Unbalanced: +12 dB
Input Connectors 2 x 3-pin XLR Female, Balanced
2 x RCA Phono, Unbalanced
Output Connectors 2 x 3-pin XLR Male, Balanced
2 x RCA Phono, Unbalanced
Input Impedance XLR: 10 kOhms
RCA: 100 kOhms
Output Impedance XLR: 100 Ohms, Balanced
RCA: 100 Ohms
Dimensions 4.15" x 2.5 x 1.55" (105 x 64 x 39mm)
Weight 1 lbs (454g)
Rolls MB15b Promatch 2-Way Stereo Converter
  • Power Supply
  • Owner's Manual
  • 1-Year Limited Warranty
  • REVIEW SNAPSHOT®

    by PowerReviews
    RollsMB15b Promatch 2-Way Stereo Converter
     
    4.9

    (based on 19 reviews)

    Ratings Distribution

    • 5 Stars

       

      (17)

    • 4 Stars

       

      (2)

    • 3 Stars

       

      (0)

    • 2 Stars

       

      (0)

    • 1 Stars

       

      (0)

    100%

    of respondents would recommend this to a friend.

    Pros

    • Easy to use (17)
    • Improves system function (11)
    • Versatile (11)
    • Time saver (7)
    • Improves sound quality (6)

    Cons

      Best Uses

      • Home studio (10)
      • Professional recording (6)
      • Amateur recording (5)
      • Performances (5)
      • Outdoor events / games (3)
        • Reviewer Profile:
        • Experienced (13), Novice (5)

      Reviewed by 19 customers

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      Displaying reviews 1-19

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      5.0

      This is a great product, very versatile

      By Bob the experimenter

      from Lacombe, Alberta, CA.

      About Me Experienced

      Verified Buyer

      Pros

      • Easy To Use
      • Improves System Function
      • Versatile

      Cons

        Best Uses

        • Amateur Recording
        • Home Studio

        Comments about Rolls MB15b Promatch 2-Way Stereo Converter:

        I used this unit to provide needed gain and to interface an internet streaming box to a digital signal processor which provides modulation to a mono low power (30 watts) FM transmitter. I needed two independent mono amplifiers so I modified both section 1 and section 2 of the unit. I isolated the two rear gangs of the level 1 and the level 2 controls, from their circuits and modified the wiring so that the level 1 control independently controls one mono amplifier, while the level 2 control still independently controls the other mono amplifier. It would be nice if a switch could be included that would accomplish what I have done, without the need to modify the circuit.

        Share this review

         
        5.0

        suprisingly efficient

        By Greyfox

        from Chula Vista, California

        About Me Novice

        Verified Buyer

        Pros

        • Easy To Use
        • Saves Time
        • Versatile

        Cons

          Best Uses

          • Amateur Recording
          • Home Studio
          • Performances

          Comments about Rolls MB15b Promatch 2-Way Stereo Converter:

          very easy to use, very efficient and very functional. Better than expected.

          Share this review

           
          5.0

          It worked perfectly

          By Dr. Jerry

          from Houston, Tx

          About Me Novice

          Verified Buyer

          Pros

          • Easy To Use
          • Improves Sound Quality
          • Improves System Function

          Cons

            Best Uses

              Comments about Rolls MB15b Promatch 2-Way Stereo Converter:

              I use this to amplify the sound on my new I-glasses which was too hard to hear. This worked perfectly.

              Share this review

               
              5.0

              Consumer to Pro in minutes

              By CB for DBs

              from New York, NY

              About Me Novice

              Verified Buyer

              Pros

              • Easy To Use
              • Improves Sound Quality
              • Improves System Function
              • Saves Time
              • Versatile

              Cons

                Best Uses

                • Home Studio

                Comments about Rolls MB15b Promatch 2-Way Stereo Converter:

                Loving it! Hooked up my consumer receiver (RCA) to my Pro speakers (XLR) in minutes. I now have a true Pro-sounding editing suite.

                Share this review

                 
                5.0

                Audio swissknife

                By Cloclo

                from Longueuil,P.Q.,Canada

                About Me Experienced

                Verified Buyer

                Pros

                • Easy To Use
                • Improves System Function
                • Saves Time
                • Versatile

                Cons

                  Best Uses

                  • Amateur Recording
                  • Home Studio
                  • Mobile DJ
                  • Performances
                  • Professional Recording

                  Comments about Rolls MB15b Promatch 2-Way Stereo Converter:

                  Very pleased about MB15b. It's my second one and
                  they are clean and useful.

                  Share this review

                   
                  4.0

                  Tried and True

                  By Megan

                  from Gambier, OH

                  About Me Experienced

                  Verified Buyer

                  Pros

                  • Versatile

                  Cons

                    Best Uses

                    • Performances

                    Comments about Rolls MB15b Promatch 2-Way Stereo Converter:

                    Used on a contemporary artwork piece with multi channel video with sound. They installed quick and easy, with no interference. We plan on using in future installation works.

                    Share this review

                     
                    5.0

                    Very clean sound

                    By Andy

                    from Tampa, FL

                    About Me Experienced

                    Verified Buyer

                    Pros

                    • Easy To Use
                    • Versatile

                    Cons

                      Best Uses

                      • Amateur Recording
                      • Home Studio
                      • Performances
                      • Professional Recording

                      Comments about Rolls MB15b Promatch 2-Way Stereo Converter:

                      No ground loops
                      Warm sound from this box
                      Heavy duty case

                      Share this review

                       
                      5.0

                      Affordable converter

                      By WLWT Donny

                      from Cincinnati, OH

                      About Me Experienced

                      Verified Buyer

                      Pros

                      • Easy To Use
                      • Improves Sound Quality
                      • Improves System Function
                      • Saves Time
                      • Versatile

                      Cons

                        Best Uses

                        • Home Studio
                        • Professional Recording

                        Comments about Rolls MB15b Promatch 2-Way Stereo Converter:

                        A very high quality audio converter. Does exactly as it said it would do. Simple to hook up and operate. No noise in the audio signal at all. A wide range of audio level adjustment. Good connectors.

                        Share this review

                         
                        5.0

                        "One of the Best Audio Convert"

                        By Chad Head

                        from Atlanta, GA

                        About Me Novice

                        Verified Buyer

                        Pros

                        • Easy To Use
                        • Improves Sound Quality
                        • Improves System Function
                        • Saves Time

                        Cons

                          Best Uses

                          • Home Studio
                          • Professional Recording

                          Comments about Rolls MB15b Promatch 2-Way Stereo Converter:

                          Love it... I am able to pull sound from old VHS files and more...

                          Share this review

                           
                          5.0

                          Works Great

                          By YeamSL

                          from Singapore

                          About Me Experienced

                          Verified Buyer

                          Pros

                          • Easy To Use
                          • Saves Time
                          • Versatile

                          Cons

                            Best Uses

                              Comments about Rolls MB15b Promatch 2-Way Stereo Converter:

                              Simple tool to use.

                              Used to convert sound from PC to be connected to a mixer.

                              Would be great if it comes with non-US adapter for the power supply (Asia user)

                              Share this review

                               
                              5.0

                              Expanded Flexability

                              By Imagine

                              from Boone, Iowa

                              About Me Experienced

                              Verified Buyer

                              Pros

                              • Easy To Use
                              • Improves System Function
                              • Saves Time
                              • Versatile

                              Cons

                                Best Uses

                                • Events
                                • Home Studio
                                • Performances

                                Comments about Rolls MB15b Promatch 2-Way Stereo Converter:

                                High quality, small size, and can solve any interface problems at a remote recording location

                                Share this review

                                 
                                5.0

                                Works great!

                                By RF

                                from Huntsville, AL

                                About Me Experienced

                                Verified Buyer

                                Pros

                                • Easy To Use
                                • Improves System Function

                                Cons

                                  Best Uses

                                    Comments about Rolls MB15b Promatch 2-Way Stereo Converter:

                                    Works as advertised, quick easy set up and performed flawlessly in an RF environment. Worked exactly as I had hoped to take computer/iPod audio to professional level XLR Stereo out.

                                    Share this review

                                     
                                    4.0

                                    Great price and functionality

                                    By ArgusFest

                                    from Denver, CO

                                    About Me Experienced

                                    Verified Buyer

                                    Pros

                                    • Easy To Use
                                    • Improves System Function
                                    • Versatile

                                    Cons

                                    • Volume range

                                    Best Uses

                                      Comments about Rolls MB15b Promatch 2-Way Stereo Converter:

                                      I got this to level out mixer audio going into my video camera. Works great. My only complaint is this one goes up to 10. I wish mine went up to 11 but it only goes up to 10.

                                      But seriously, it could use a little more volume range. Other than that it's great!

                                      Share this review

                                      (1 of 1 customers found this review helpful)

                                       
                                      5.0

                                      Professional product for all users

                                      By ForestGlen

                                      from Cullowhee, NC

                                      About Me Experienced

                                      Verified Buyer

                                      Pros

                                      • Easy To Use
                                      • Improves Sound Quality
                                      • Improves System Function

                                      Cons

                                        Best Uses

                                        • Amateur Recording
                                        • Home Studio
                                        • Professional Recording

                                        Comments about Rolls MB15b Promatch 2-Way Stereo Converter:

                                        Promatch MB 15b, manufactured by Rolls, is a high-quality product that enables connectivity between amateur, mid-level professional, and professional stereo equipment. The unit is a solid performer; it does not introduce hum or distortion when used with high-quality cables. Two units are needed for stereo connectivity.

                                        Share this review

                                        (2 of 2 customers found this review helpful)

                                         
                                        5.0

                                        MB15B PROMATCH

                                        By kenny a

                                        from portland,tn

                                        About Me Experienced

                                        Pros

                                        • Easy To Use
                                        • Improves Sound Quality
                                        • Improves System Function

                                        Cons

                                          Best Uses

                                          • Events
                                          • Home Studio
                                          • Mobile DJ

                                          Comments about Rolls MB15b Promatch 2-Way Stereo Converter:

                                          I needed something to bring the level up from my yamaha HTR-5830 to my yamaha p3500s.this little device is a must have for any DIY home theater setup if you're using a pa amplifier.highly highly recommend it !! im just glad that companies make such a product to make people like me very happy !!

                                          Share this review

                                          (4 of 4 customers found this review helpful)

                                           
                                          5.0

                                          Perfect for home theater -> Pro amp

                                          By MStormO

                                          from Austin, TX

                                          About Me Novice

                                          Verified Buyer

                                          Pros

                                          • -10 dB RCA to 4 dB RCA
                                          • -10 dB RCA to 4 dB XLR
                                          • Easy To Use

                                          Cons

                                            Best Uses

                                            • Home theater to pro amps

                                            Comments about Rolls MB15b Promatch 2-Way Stereo Converter:

                                            I have a home theater where 3 of the seats have Buttkicker tactile transducers, for those earth quaking explosions etc.

                                            Tactile transducers require a lot of wattage from your amp, so a pro amp suited me best (lots of power, drive low ohms, cheaper per watt). However, since my home theater receiver only had the typical -10 dB output on the sub-woofer channel, I needed something to bring it up to the +4 dB required by the professional amp.

                                            This box is an affordable way to integrate professional audio equipment into your home theater. No fuss, just works.

                                            Just be careful when you now do the channel balancing, since you'll have three places to adjust the audio level, 1) the receiver, 2) the MB15b Promatch, and 3) the amplifiers input gain.

                                            Share this review

                                            (2 of 2 customers found this review helpful)

                                             
                                            5.0

                                            Solid and stable

                                            By KK

                                            from New York

                                            About Me Experienced

                                            Verified Buyer

                                            Pros

                                            • Easy To Use

                                            Cons

                                            • Limited Function

                                            Best Uses

                                            • Professional Recording

                                            Comments about Rolls MB15b Promatch 2-Way Stereo Converter:

                                            It is very simple and easy to use. The function is limited, converting the audio signal from Unbalanced to balanced and in the opposite way but It works totally fine my use. The price is very affordable, too.

                                            Share this review

                                            (3 of 3 customers found this review helpful)

                                             
                                            5.0

                                            DO NOT leave home without one of these!

                                            By Eythan Holladay

                                            from Atlanta, GA

                                            About Me Experienced

                                            Verified Buyer

                                            Pros

                                            • Easy To Use
                                            • Professional Functions
                                            • Versatile

                                            Cons

                                              Best Uses

                                              • Events

                                              Comments about Rolls MB15b Promatch 2-Way Stereo Converter:

                                              This will make the 7th MB15 I now have in my kit. This little swiss army knife allows me to work around "mis-communications" in the planning phase. It is also very handy to deal with low audio levels as this unit is active AND it works wonderfully as a pad.

                                              Share this review

                                              (4 of 4 customers found this review helpful)

                                               
                                              5.0

                                              Multibox magic

                                              By WB Vaughan

                                              from Miami

                                              Comments about Rolls MB15b Promatch 2-Way Stereo Converter:

                                              Great gadget for ENG videographers using HDV camcorders. We use it to connect to sat trucks and multi boxes in news-pool situations. The outputs are almost always +4 dbu professional line level, and the HDV camcorders are all consumer, -10dBv line inputs. This inexpensive but capable gadget does the conversion and provides attenuation or amplification as needed. It is bi-directional, so we can feed takes from a camcorder direct to the sat truck inputs, or receive from them. Neat, compact, inexpensive. Great gadget.

                                              Expertise: Multimedia producer for newspaper website

                                              Previous Equivalent Item Owned: Various passive attenuators

                                              Items I Recommend: XLR and RCA cables, headphones

                                              Share this review

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