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It's doesn't "determine" the noise per say, but its one of many factors that help damp the noise of the zipper and change its acoustics alongside fit/tolerance/material and design.Yeh right okay.
I don't believe it's the fabric thickness that determines zipper noise I'd be banking on the fact that greenfinger tents are shithouse and cheap so it means everything is gonna be cheap and nasty.
Quite often the covers aren't lined up correctly when they've been stitched up so you get wonky flaps on cheap tents and therefore the zippers won't align correctly.
Also the cheaper zips don't have much strength to hold together so if you accidentally inflate your tent to a balloon (which can be an easy mistake to make) the zippers won't ever be the same again and you'll have major light leaks and noisy bloody zippers
For instance I have two glasshaus 90x90s. Same zippers but different fabric thickness. Completely different sounds. Same with the two 60x60 tents here (hydro experts). Same brand, same zippers but one has the 1680 fabric and the sound of the zipper is nowhere near as coarse as the 600d tents. Probably similar levels on a noise Meter, but the sharp pop is taken out of the movement.
Just like 1680 fabric dulls the fan noise inside the tent, it dulls the reverberation of the zipper inside the tent and certain frequencies become less audible such as the sharp pop.
Another good way to put it. I made a few bike bags out of 210 fabric and one in leather. The sound of the zippers (all the same) are completely different when fastened to leather compared to the cheap 210 fabric. It's subtle in some cases and outright obvious in the case of 210 vs leather.
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