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About us

Leon Spanjersberg, Rik Stoet

On Dutch grounds


Square Audio is based in an industry area in Rijswijk, a small town close to the Dutch coastline and The Hague, our Residence. We are within 10 minutes reach of all important facilities as transport, contractors, suppliers and universities. 

Parts of our country are up to six meters under sea level but we keep it dry by pumping out the water 24 hours a day. One of our pump stations is kept open as a museum. It is still in function with its original machines working on steam!


Dutch waterworks for the delta plan

The Rotterdam harbor, entry to Europe

The Rotterdam harbour, entry to Europe

Steam pump station in Lemmer

The steam pump station in Lemmer



The roots of our company go back to 1928 when Radio was in the early phase.  We originate from ir.H.Stoet's Radio, a company known for their high quality products in the field of radio reception, aerial distribution, industrial transformers and power supplies. We have been producing a range of tube amplifiers and amplifier kits, CD-players with tube output stages and audio output transformers in the past twenty years.

In 2005 we started with the first Essential Audio Tools product and since then we have been extending our range. The latest product is the Mains Multiplier Myni; the smallest high end mains extension box on the market.



As a team we spend a lot of time listening to music. We take time to experiment with our ideas and circuits developed to reach not only measurable but also audible results. We are passionate when it comes to reaching our goals by finding new directions. This is what you will be experiencing too, when using our products.

Development starts with a simple idea. This idea sometimes takes years to become a product that fits our standards. We use sophisticated software to design and analyse our process and CAD software to implement our idea, with a real product as a final result.


We are proud that all our products are 100% made in Holland. We work with efficient and precise machinery like our Cincinnati CNC machining centre which is capable of reaching precision up to 0,001mm. Only high quality materials like POM-C and Delrin are used.

Assembly line of Mains Multiplier 5

Mains Multiplier 5 assembly line



POM-C waste from the machining process is recycled by our suppliers.

Further we recycle all metals, cooling fluids, isolation materials and packaging to reach a waste stream of less then 3% of incoming materials. We have a green energy contract with our energy company and try to minimize our energy consumption by working as efficient as possible. It's our daily challenge to keep it this way.



When a product is finished we take good care of the following processes. A rugged packaging, understandable documentation, careful handling, reliable shipping and 100% support to you and our retailers is essential to our products.

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