OCA's target curves

[Jumu]

Express filters only about up to 200Hz for front mains, and to about 250Hz for the rest of the speakers. My experience of touching beyond that has been consistently quite negative. You can only invert min phase part of the room boundary effects and excess phase part of the speaker cabin. With min phase EQ, that limits you to room transient frequency which is about 200Hz. With linear phase filters, you can additionally throw in a crossover/box phase correction targeting LP.

Thank you for the clarification

 

[LeoB]

Dolby Atmos Music curve

I've never heard of this curve before. I just checked online and discovered I'd tuned my speakers by ear, matching them precisely to this curve within ±1 dB.

 

[OCA]

I've never heard of this curve before. I just checked online and discovered I'd tuned my speakers by ear, matching them precisely to this curve within ±1 dB.

It's the official Dolby labs curve suggested to Atmos music mix engineers in their tech manual. It seemed ridiculously low in bass (visually) to me and I admit I didn't even bother trying it for a long time but recently after certain improvements in the bass response, it gives about just the right bass for music at least in my system and older curves now sound a bit too heavy.

 

[LeoB]

I boost the bass about 1-2dB following this curve, and then Auro 3D up-mixer, I use on all material, adds some more bass below 50Hz.
What surprised me the most in this curve is the high-frequency roll-off. I thought most people prefer more linear slope with -2-3dB at 10k.

Over the years, I tried all the popular curves and none of them worked for me. So, I decided to EQ my system by ear to my liking. It took me some time. When I was satisfied, I applied all the filters I came up with to the front speakers' frequency responses in REW, and the resulting response was almost identical to this Dolby Atmos Music curve. The only real difference - mine is about -5dB at 10k.

OCA, I would like to take this opportunity to thank you for your excellent work!

 

[FrantzM]

Stupid question and one I hesitated to ask...

Long story my HT Projector bulb blew up. I am reverting to 2-Channel + 2 Subs.

I ran Express on my Denon AVR-X3400 and the 2 subs. The 2 Subs are EQ through MSO and are connected to a miniDSP 2x4 HD. Thus the AVR "sees" only one sub... It works but the level of bass is that 10 dB for LFE... Simple thing would be to just go to the Denon and reduce it but ... It seems to be off.. and I can't change the level of the subs.. What to do? I seem to have the same problem with Acoustica too..
WHat do you suggest me to do?

THanks in advance

 

[OCA]

Both Acoustica and Express expect a subwoofer like response from the subs and precisely measure their lowpass and highpass frequencies and roll off strengths to determine their optimal volume levels based on the target curve. If you give them a full flat sub response through a minidsp, the algos would likely fail since that's not a normal sub response by any means. The calculations only effect sub volume level though and in Acoustica you can manipulate it with "target infill" setting.