Indeed, the sound of normalized SRH1540 is duller with Sonarworks, unless additional treble adjustment is applied. The response at high frequencies is rolling off.Two remarkable differences can be seen though: Note that this is only approximation since measurement data for SRH1540 is obviously different between Morphit and Sonarworks (it's hard to perform headphone measurements reliably, especially at high frequencies).īut still, we can see similar shapes here, confirming that Sonarworks may be using something similar to either of the curves (and it's definitely not a "flat" target response as their UI suggests). The Sonarworks' approximated response is a green curve. Here is the result compared to Morphit's "Studio Reference" (red) and "Studio Speaker" (which as we remember, resembles Harman Target Response) (blue). Then using "Trace Arithmetic" in Room Eq Wizard, I derived a transfer function for transforming Morphit's filter response into Sonarworks', and applied this transfer function to Morphit's "Studio Reference" curve. I've chosen the same headphone model-Shure SRH1540 as a source both in Morphit and Sonarworks, and normalized a test sweep signal separately using two plugins. In order to provide an educated guess, I've performed the following experiment. As we have seen with the Harman Target Curve and Morphit, an honest "flat loudspeaker in a reference room as picked up at eardrum" may not be a preferred setting due to its "dullness." Thus, the "flat" target setting for headphones must be "as heard using speakers calibrated to flat response," but they did not specify under which conditions, and with which tweaks. My speculation is that since the package offers normalization for both headphones and speakers, the team has decided, they will represent the normalization from the speakers point of view. But as we know from Part 1, it shouldn't really be flat at the earphone speakers. The UI doesn't help much, it indeed shows the target response as flat. The next important question-what does "Flat" target response mean for headphones. I've asked a question about this on Sonarworks' support forum, and their representative confirmed my suspicion that the target curves in the package are not as up to date as the source averaged measurements. Here I have discovered the first curious thing-simulating HD650 using "HD650 Average" measurement didn't result in a flat compensation curve, and a similar thing with AKG K712: I guess, this was done to work around some legal issues. "A well respected open hi-fi and mastering reference headphone model nr.650 " Illustrated by a picture of Sennheiser HD650 as a hint. The list of source responses only includes real headphone models, but no artificial curves like "flat at the eardrum." The list of target responses is even more limited, offering only a handful of speakers and headphones, which are presented like riddles, e.g. However, Sonarworks doesn't offer the same degree of freedom for setting up the source and the destination frequency responses as does Morphit. It's also great that all 3 curves: source, correction, and target can be displayed on the graph. I really like that the UI shows the grid for the response curves.
#SONARWORKS REFERENCE 4 SAMPLE RATE PRO#
For the purpose of writing this post, I've been playing with the implementation targeted to pro users, which offers more tuning capabilities. For non-professionals, Sonarworks also offer "True-Fi" package which applies the same headphone correction curves using a simpler UI. Sonarworks offers a package for recording studios called "Reference" which consist of room correction software, headphone correction filters, and system components that allow applying these corrections on a system wide level. In this part, we will examine Sonarworks Reference. In Part 1 we have considered the need for headphone normalization and its implementation in Morphit plugin by Toneboosters.
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