After all this time, we've never had a good complete set of HD600 measurements. So now it's time, considering the recent work on compensations for the MiniDSP rig. I figured this would also be a good test case for the following reasons: The SBAF compensations for the MiniDSP were arrived at using 10-12 headphones, but the HD600 was never one of these. This would be a good test case for the compensations. The flat plate coupler (with no ear) results, the "V2" measurements, never did a good job differentiating the Sennheiser headphones. (HD600, 650, 580, 660S, 58X, etc.) We should expect a slight 3kHz bump for the HD600, given that @Hands and @Serious were instrumental in providing feedback. HD600 Frequency Response (EARS with SBAF compensation) Flat-line across is perceptual neutral (Revised 2/26/2019) The results are actually quite interesting. Quite a few people have felt that the HD600, although close enough to neutral, was slightly on the bright side. We see a little broad bump at 3kHz which is expected. There are also small narrow peaks at 5kHz and 8.5kHz. These peaks could be dependent upon the ear. Let's take a look at the foam surface flat-plate coupler measurements for the HD600 to check from another angle. HD600 Frequency Response - Flat Plate "V2" Coupler It should appear that some of the elements, the 5kHz and 8kHz peaks are there, but not quite as sharp or elevated. The 3kHz bump in the EARs doesn't exist at all. This is expected given pack of pinna which will amplify the 2kHz region. For comparison, here is the Sennheiser HD58X. (Revised 2/26/2019) This looks about right. I know one of @CEE TEE's goals at Massdrop was to get better extension out of the HD58X. I'm sure many of you have noted the 5kHz measurement peak with the various HD58X measurements out there including Jude's. The thing is, I don't think it's as present as shown above. The MiniDSP EARS results are more reflective of what I think most of with the HD58X hear. Now wouldn't it be interesting if Massdrop could get Sennheiser to make a headphone with the HD58X response with the more resolving 300-ohm driver of the HD600? Maybe we should start a petition on it?