I finished building a pair of Four Pis last weekend. I've only got a couple of hours time listening to them, but I'm a little underwhelmed with the sound at this point. They sound a little muddy and the bass response isn't as good as I expected. I've attached a graph showing a measurement with FuzzMeasure (admittedly using the built-in microphone in my laptop).
Does this look right? It looks to me like the lower frequency drop off is steeper than expected. I purchased my JBL 2226Hs used. Maybe they need to be reconed? Anything else that might be causing this?