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    KMA MACHINES Stereo AB/Y


    Stereo signal routing for your pedalboard

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    SHIPPING TO THE USA – The Royal Mail has created a new PDDP (Postal Delivery Duties Paid) service, which will calculate exact costs at the moment we book your shipping. While we are happy to absorb some of the costs, if the cost of the pre-paid duty is significantly more than what you have paid when placing your order, we will be in touch to request the balance is covered by you.

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    Customers hold the right to return a product for a full refund if I am notified within 30 days of delivery.

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    that you received it. It must also be in the original packaging.

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    Once I have confirmed that I will process your return, please send the item to:

    Boost Guitar Pedals (returns)
    84 Wolf Lane 
    Windsor 
    Berkshire 
    SL4 4YZ 
    United Kingdom

    Replacements and refunds

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    About the KMA MACHINES Stereo AB/Y


    The KMA Machines Stereo AB/Y is a passive stereo AB/Y box with active switching, enabling you to route your signal in various ways. Send a stereo source to two separate destinations, such as two different effects chains, or switch between two stereo sources (such as different guitars) feeding the same setup. 

    Separate left and right connections on all three paths make it a practical routing tool for stereo pedalboards, keyboards and recording setups.

    Stereo routing in either direction

    Connect the output of your stereo pedalboard to Y, with A and B feeding different stereo destinations. Select either destination on its own, or engage both together. It's a straightforward way to choose where your stereo signal goes without repatching between songs or takes.

    The audio path also works in reverse. Connect two stereo devices to A and B, then take Y into a shared stereo effects chain or recording input. Switch between a keyboard and a drum machine, for example, or bring two stereo effects chains together in parallel for a huge wall of texture.

    Two footswitches, three choices

    The A | B footswitch selects between the individual A and B paths, while thhe A & B footswitch connects both simultaneously; press it again to return to the individual path you previously selected. Red indicates A, yellow indicates B, and blue shows that both are active.

    Each top-mounted routing connection has its own left and right jack sockets for stereo signal paths.

    Passive audio, relay-based switching

    The Stereo AB/Y keeps the audio path passive. A separate powered relay circuit handles the soft switching, designed to reduce mechanical noise and unwanted switching clicks and pops.

    Stereo AB/Y features & specifications

    • Passive stereo AB/Y box with active relay-based soft switching
    • Bidirectional stereo routing: one stereo input to two stereo outputs, or two stereo inputs to one stereo output
    • True bypass
    • Red, yellow and blue routing indicators
    • Six top-mounted audio jacks
    • Made in Berlin, Germany
    • Power: 9V DC, centre-negative (not supplied)
    • Dimensions: 112mm × 56mm × 65mm
    • Weight: 260g

    KMA Machines Stereo AB/Y Demo


    KMA Machines Stereo ABY — front view with bear artwork and two footswitches

    About KMA Machines

    KMA Machines was founded by Enrico Preuß in Berlin, Germany in 2013. The name is an abbreviation of Karl-Marx-Allee, where Enrico started out making pedals in his apartment.

    Enrico believes in using the best quality parts as well as refining ideas with proper R&D time before releasing pedals on the market, and the result is a pedal company that has surged in popularity in
    recent years.

    Some of his pedals are now on version 2.0, featuring even more pedalboard-friendly designs including top-mounted jacks, plus enhanced features to aid tweakability.