# \#grs

**URL:** https://discourse.midwestaudio.club/tag/grs/116.md

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## [GRS Poly "surface mount" 4" 4 ohm and ND28F in waveguide](https://discourse.midwestaudio.club/t/grs-poly-surface-mount-4-4-ohm-and-nd28f-in-waveguide/454)

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**Author:** [@jr-mac](https://discourse.midwestaudio.club/u/jr-mac)\
**Replies:** 13\
**Last updated:** [May 24, 2026, 6:57pm UTC](https://discourse.midwestaudio.club/t/grs-poly-surface-mount-4-4-ohm-and-nd28f-in-waveguide/454 "2026-05-24T18:57:44Z")

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Ken is printing waveguides for the tweeters, and I just bought 0.34 cubic foot flatpacks from Cinergy since it is too cold to spend too much time out in the garage. I can glue them up indoors, and then maybe cut one driv…