NAL-NL2 vs SmartFit and Real Ear Measurements

[jim_lewis]

There is a pretty good but getting old thread discussing the various fitting formulas. Here’s a link to the 2nd comment rasmus_braun made in the thread (see also his previous one above in the referenced thread):

Fitting Rationales: VAC+ vs. NAL-NL1, NAL-NL2 or DSL v5.0a

I think it depends on what your goals are. If you want a very natural and comfortable sound quality, then the proprietary formula will likely work well. But if you want the best audibility of speech, NAL and DSL are both proven approaches. I would suggest that you try a verified (using REM) fitting with NAL-NL2 or DSL v5 and see how you perform on a speech-in-noise test, and then compare it with the proprietary formula.