Balanced to Unbalanced interface, called "balun" is often find in antenna circuits. But balun is needed in audio too. This one is made specially for audio frequencies in 2:1 ratio in rugged and compact package (weighting only 100grams).
This is high quality interface for connecting professional to semiprofessional standard equipment. In other words connects balanced sources to unbalanced inputs without impedance drop and no overload on semiprofessional input side. Both level and impedance are transformed through for this application specially adapted transformer. Transformer is made by Lundahl based on their LL1532.
Connections schematic shown below (XLR-s pin Nr.1 is connected to housing).
Dimensions: height=31mm, width=26mm and length=74,4mm. Weight 100gr.
BalUn 221 datasheet
LL1532 datasheet
BalUn - Digital
110-75 ohm and 75-100 ohm Digital Audio Impedance Adapters
For digital audio interconnects the line rate of a 44.1kHz SPDIF interface is over 5Mbps. Cables longer than about 5m should be 75ohm impedance like video cable.
Digital Audio Impedance Adapter allows 75 ohm coaxial transmission of AES/EBU Digital Audio signals. Adapters are designed to convert all standard AES/EBU digital audio signals from 110 ohm/XLR3 Output (@ 4.5 Volts) to a 75 ohm BNC coaxial cable and back again to a 110 ohm/XLR3 Input (200mV min). They also provide excellent rejection against hum and RF noise.
Key Features:
• SMPTE 276M and AES3 Transmission Standard
• Coaxial transmission of 2 Channel Digital Audio
• Allows longer cable runs than 110 ohm twisted pair
Digi BalUn is made in two versions:
75 ohms BNC to 110 ohms male XLR 110 ohms female XLR to 75 ohms BNC
NOTE: The AES signal at 1V is the same voltage as the analog video signal. Instead of discarding old patch panels for analog video, they can be used for patching AES in the coax format. Check in the service manual or with the manufacturer to see if your distribution amplifier have enough bandwidth and a good squarewave response to handle digital signals.
Digi BalUn datasheet
Splitter MM1128
The stagebox mic line splitter MM1-1-2-8 is available in two variants, both with Lundahl transformers inside:
MM1128 Allegro - with LL1581XL transformer for pro audio applications. Great sound with high immunity to external magnetic fields.
MM1128 Crescendo - with LL7904 transformer for the absolute best in performance and very high signal levels. From mic signal levels upp to +23dBU on less than 1%THD @50Hz (less than 0,1%THD @50Hz) This transformer has no equal in the market!
Splitter MM 1-1-2-8 is a high quality professional 8 channel audio signal splitter for use on stage, in studio, in OB vehicles etc. This passive splitter offers mic and line signal level splitting without coloring the signal.
Splitter MM 1-1-2-8 is passive, which means no batteries, ”wall warts” or power cords are required.
Why passive? To make no coloration on the original signal we used Lundahl's transformers, because of Lundahl's transformers are well known as transparent. We did not used any other component which would made colorations on sound. There is no resistors, no capacitors and absolutely no amps in signal path. Used connectors, switches and cable are carefully selected to match highest quality requirements.
Plug Mama MKII housing is an extremely robust and compact stagebox in a modern, well thought out panel design
APPLICATIONS:
• Studio and live stagebox splitter
• Sub-distribution
• Fixed installation
• Floor and wall installation
The rugged steel housing ensures that the Splitter will not pick up noise from RF (wireless mics, TV links, mobile phones etc.) or AC mains (cables, transformers...) and will lead a long and productive life on stage and in similar harsh enviroments.
Product details: input and output connectors
PRODUCT ADVANTAGES:
• 8 channels in the rugged steel housing.
• Each channel consists of the input, one direct out and two transformer isolated out's.
• Each transformer output winding has its own Faraday shield.
• Phantom power is passed through Direct output to Input.
• Combo™ receptacles accommodate XLR and balanced ¼'' connectors.
• RF rejection ensured thanks to transformer´s audio bandwidth.
• Ground lift switches for isolated outputs are splashproof and lockable.
• Compact and suitable for muliple set-up with a modern and ergonomic panel design
• Better overview even in bad lighting, because inputs are clearly separated from outputs
• Enormously scratch-resistent with special double lacquered coating
We guarantee that this splitter will survive fall from one meter high and operate correctly afterwards. Damages on the box like deformations and skraches are to expect and we can not take answer for them.
We are very proud to use the famous LUNDAHL Transformers in our Splitters. Lundahl is a Swedish company that has designed and manufactured superb audio transformers for 50 years. Their quality is attested to by a long list of famous companies in the audio industry and many, many hi-fi enthusiasts.
Die besten Ideen kommen aus Schweden!
Unser schwedischer Kund Mirza aus dem Multimedia StudioZ hat sich für unsere Plug Mama (Gewinner des Soundcheck Leserpolls 2007) etwas besonders einfallen lassen: Unbeeinflusst vom etwas knappen Platzangebot hat es Mirza geschafft, aus der passiven Box eine aktive zu basteln und der Plug Mama jede Menge Lundahl Transformer zu spendieren.
Weitere Infos erhalten sie auf der Website www.mmstudioz.com !
Many thanks to Pascal from Sommercable!
Dimensions and weight:
Allegro - height=157mm, width=258mm and length=310mm weight=5,2kg
Crescendo - height=157mm, width=258mm and length=310mm weight=6kg.
MM1128 datasheet
LL1581XL datasheet
LL7904 datasheet
Splitter MM1121
One channel mic line portable splitter is available in two variants, both with Lundahl transformers inside:
MM1121 Allegro - with LL1581XL transformer for pro audio applications. Great sound with high immunity to external magnetic fields.
MM1121 Crescendo - with LL7904 transformer for the absolute best in performance and very high signal levels. From mic signal levels upp to +23dBU on less than 1%THD @50Hz (less than 0,1%THD @50Hz) This transformer has no equal in the market!
Splitter MM 1-1-2-1 is passive, which means no batteries, ”wall warts” or power cords are required.
Why passive? To make no coloration on the original signal we used Lundahl's transformers, because of Lundahl's transformers are well known as transparent. We did not used any other component which would made colorations on sound. There is no resistors, no capacitors and absolutely no amps in signal path. Used connectors, switches and cable are carefully selected to match highest quality requirements.
Compact case of die cast aluminium with Neutrik connectors and rugged switches for ground lift.
Dimensions and weight:
Allegro - height=45mm, width=108,5mm and length=90mm weight=360gr
Crescendo - height=45mm, width=108,5mm and length=170mm weight=585gr.
We guarantee that this splitter will survive fall from one meter high and operate correctly afterwards. Damages on the box like deformations and skraches are to expect and we can not take answer for them.
Note: switches shown on pictures here are closed (closed contacts), red part is visible. In normal operation switches should be open and red part of button not visible.
MM1121 datasheet
