My experience with the above JBL Endurance, after about 6 hours of use on classical, dialog, and solo pipe organ is that they are bright but not peaky, but the bass is quite weak. My references are AKG371s and ELAC DBR62s. The curves suggest that they are about flat to 20 Hz. If they are, I fail to hear it -- yet I do hear honest bass to ~20 Hz with the AKGs. (Both are driven by the same DAC/HP amp.) Most important, they are not annoying; just not reference-competent. YMMV, but for $20?