I was DREAMING for such a test file,I was planning to do it myself,thank you!At some point, it can be fun with some practical tests so that people can listen for themselves and come to their own conclusions.
For this test to work, you must have at least two subwoofers set up in a stereo configuration.
I created a 30-second long audio track of pink noise that has a low-pass filter at 60 Hz with a roll-off slope of 12 dB/octave.
Here is the sound clip: https://www.dropbox.com/s/a4ike3s1s1bwmp7/Bass L, L+R, R, L+R, L (35ms delay)+R.wav?dl=0
- The first 6 seconds of the track is the left channel playing alone.
- The next 6 seconds (6-12s) are both channels playing together but reduced by 3 dB to get the level matched.
- The next 6 seconds (12-18s) is the right channel playing alone.
- The next 6 seconds (18-24s) is back to both channels playing together, yet again with a reduced level by 3 dB (this part is the same as #2)
- The last 6 seconds (24-30s) are both channels playing together. But this time the left channel is delayed by 35 ms and the right channel is increased by 3 dB to somewhat simulate a stereo recording of the bass sound coming from a place closer to the right channel.
And this is what I hear:
1. I can clearly hear the sound coming from the left side of my room for the first 6 seconds.
2. For the next 6 seconds the sound shifts to a central point right in front of me.
3. Now the sound clearly shifts to the right side of the room.
4. The sound is now back to the central point right in front of me.
5. And this is where the interesting things happen and what I think David Griesinger is talking about. The bass sound is no longer clearly heard from a central point right in front of me, instead, now it has a more enveloping characteristic that fills my listening room in a completely different way.
To me, it's pretty clear that low-frequency content recorded in stereo, and reproduced with at least two subwoofers in a stereo configuration can add envelopment to the overall sound.
Ears are not measuring devices! You are talking about a subjective phenomena, which differs from person to person, hence there can be no agreement.I don't know how that could be measured if you don't want to use your built-in measuring devices, also known as your ears.
The above test file is beyond agreement or not,the effect is as audible as it gets even with the mains deactivated.
Yeah, one could make a point about the crossover filter not being steep enough to avoid higher frequencies to spill into known audible territory though.
I'd think one would measure it the same way as soundstage, imaging, or any other stereo phenomenon... which is to say I don't think you can. Stereo is an illusion, and I've not heard of any way to measure aspects of that illusion objectively.
I listened track one on Apple Music, hi-res/lossless.
Please submit that test file again. I can’t find it on the thread.You have your mono test in the test file I provided. From 6 to 12 seconds, and from 18 to 24 seconds you have identical signals going to both channels, that is mono.
The aim of this test is to isolate what is happening in the low end in particular, you can argue that the effect of this may be masked when a complete recording of a song is played, that will depend on a lot of different factors.
I suspect that I will never be able to make a test file you will approve.
Dr Griesinger has proposed a metric for envelopment which he called DFT (diffuse field transfer function) and the method to measure/calculate it. A summary of the method is given below.
I did ask to point to what is pointed.
Here (in the middle of the post)
www.audiosciencereview.com
You have your mono test in the test file I provided. From 6 to 12 seconds, and from 18 to 24 seconds you have identical signals going to both channels, that is mono.
The aim of this test is to isolate what is happening in the low end in particular, you can argue that the effect of this may be masked when a complete recording of a song is played, that will depend on a lot of different factors.
I suspect that I will never be able to make a test file you will approve.
Some other member has a question as to how spatial sensation can be measured, and I provided an answer. You have a problem with that?
