"2mb" writes:

I have used the common soft foam earplugs found in factories to go to
concerts with for years and had excellent sound quality with them

Excellent sound quality with foam? You must not be terribly
discerning as they are FAR from flat.

As for ability to reduce SPL, they're hard to beat no doubt, but it
comes at a cost of severe coloration.

Best Regards,
--
/"\ ASCII Ribbon Campaign | Todd H
\ / | http://www.toddh.net/
X Promoting good netiquette | http://triplethreatband.com/
/ \ http://www.toddh.net/netiquette/ | "4 lines suffice."