Anyone have a link to some 4" inlines being compared DB wise?... i'm in the market for a 4" inline+filter for my gl60 led side project..need the fan to not be too noisy. will a speed adjuster do for me on any fan? or should i look at the TD series that are like 150$ for the inline 4". i think there the softest sounding but you cant find any pictures/videos of people with them..