Originally Posted by MKtheater
Reference levels at 10hz is 115 DBS which is peak. I hit 110 DBS with rms sine waves. Peaking at 115 DBS with source material should be no problem. Also, how many 0 DBFs scenes have you seen below 10hz even with the best bass movies? This is the reason I don't notice the lack of 12 db headroom at 10 hz.
Right, I'm with you there. You've got the output for reference peaks at 10Hz if necessary. And you're right, they're not encoded 0dBFS.
The problem is that whatever they are encoded at (let's say for example a -10dB 10Hz peak, likely still hot for real world but just an example), if you're playing back set to reference level it's going to ask your subs to reproduce -10dB from reference at 10Hz.
But what your system will respond with is -15dB at 10Hz because of the response roll-off. So while you're system would likely handle 10Hz there no problem, it won't deliver it unless you're +5dB hot from reference (negating the point of hitting 10Hz at reference mostly) or you EQ the rest of the response flat to 10Hz.