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About Us

  • We develop and sell audio kits for home assembly

Our products

  • Our speciality is switched mode amplifiers with audiophile sound quality!
  • Our kits have excellent quality and price/performance ratio.
  • The amplifiers have high energy efficiency; heat sink / cooling requirements are minimal.

New customer

  •  Create an Account It's very simple. An account is needed to
    • Change currency and tax settings
    • Contact Us
    • Shop
    • Have access to all documentation
  • If you are new to DIY audio and want a simple to build kit:
    • Take a look at our BASIC kits
  • We ship world wide and shipping costs are decent.
  • Use PayPal or bank to pay for orders placed in The Shop

Search for info

  • Find products (At the top of this page under the logo)
  • Find in the FAQ (At the top of this page under the logo
  • Sitemap (coming)
  • Do a Google search for our site (coming). It covers all our sites but is updated at the grace of Google.

On the web

  • The Main Site with The Shop and sales support at www.41hz.com
    • The Tec Doc wiki with Technical Documentation.
    • The 41Hz Audio Forum for customers discussions. Lots of experienced builders hang out and post on a daily basis. Ask them!
    • The Tec Doc and Forum have their own search system.

We are

  • ... located in Stockholm, Sweden.
  • ... basically a one man company with help. We depend and rely on help from friends in the DIY audio community world wide.

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41 Hz is the frequency of the low E string on a double bass or an electric bass

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