Convert Your Sierra-1 To Sierra-2EX V2 DIY upgrade kit to convert your Sierra-1 speakers to Sierra-2EX V2. This is a huge performance upgrade while also being a fun and educational...

Upgrade Your Sierra To Our New Sierra-LX! DIY upgrade kit to convert your Sierra-1, Sierra-2, or Sierra-2EX to our new Sierra-LX. Sierra-LX is a fully Klippel NFS optimized speaker designed for...

Convert Your Sierra-2 To Sierra-2EX V2 DIY upgrade kit to convert your Sierra-2 speakers to Sierra-2EX V2. Sierra-2EX V2 feature our top-of-the-line "EX" woofer which dramatically improves bass extension, midbass...

Upgrade Your Sierra-1 To Our New Sierra-1V2! DIY upgrade kit to convert your Sierra-1 to Sierra-1V2. Sierra-1V2 is a fully Klippel NFS optimized speaker designed for wide and linear dispersion,...

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...

Upgrade Your Sierra-2EX to Sierra-2EX V2 DIY upgrade kit to convert your Sierra-2EX to Sierra-2EX V2 Using high resolution 360-degree measurement scans generated by our Klippel NFS, we have developed...

Convert Your Duo To DuoV2! DIY upgrade kit to convert your Duo speakers to the new DuoV2. DuoV2 features a new Klippel NFS optimized crossover combined with enhanced cabinet  and...

Convert Your Luna To LunaV2! DIY upgrade kit to convert your Luna speakers to the new LunaV2. LunaV2 features a new Klippel NFS optimized crossover combined with enhanced cabinet  and...