NrT Upgrade Kit

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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 spa rkle 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. Show more