your offcially a basshead I own RE0 and the FiiO E5 and the results - Cowon D2+ > RE0 - I agree, lacks the lows, but the FiiO E5 is a miracle worker for these IEMs, when it comes to bass. Cowon D2+ > FiiO E5 > RE0 gives you rich highs, mids and also lows. The E5 gives it the necessary punch...