* 1 year manufacturer's warranty on kit components
* Free return shipping on the old components, just ask

Convert Your Sierra-1 To Sierra-1 NrT

DIY upgrade kit to convert your Sierra-1 speakers to Sierra-1 NrT.

Sierra-1 NrT offer more high frequency detail and energy, with improved sparkle and shimmer.

Detailed instructions are included. If you prefer not to do the work yourself, we would be happy to perform the upgrade for you. Simply give us a call or send an email for details. There are advantages to having us do the work for you. 

*Note: 1 kit needed for each speaker.  A pair of speakers requires 2 kits.


100% MONEY




Our NrT upgrade kit replaces the Sierra-1 stock tweeter with our highly regarded NrT dome, which features a neodymium ring magnet, a larger tuned damping chamber, a specialized low mass voice coil, and an improved damping system. This extremely high performance dome tweeter extends the high frequency response and has lower stored energy.

An advanced custom crossover to match the NrT dome is also included, as are detailed instructions.

Highs are extended with greater detail and energy. Highly recommend for Sierra-1 owners who wish to take their speakers to the next level of performance.

Each kit Includes:

  • (1) NrT dome tweeter
  • (1) NrT crossover
  • (1) NrT upgrade label
  • any necessary gaskets
  • detailed instructions

NrT Upgrade Kit

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