Today turned out completely different than planned. Originally I wanted to stay home and do some admin work, but then I ended up grabbing my recording gear, the bike and off I went to a place I wanted to go for a long time: Himmelreich aka The Great Kingdom. That's a small hill near Walkenried. About 150 years ago they drilled a train tunnel through that hill. Incidentally there's a huge cave within that hill, it is said it's one of the largest cave halls in Germany. The tunnel is going right through it.
- 0:00 - 0:14: Showing you the acoustics of the tunnel
- 0:15 - 1:44: incoming train. Adjust your volume to the fly at 0:15 - 0:19. Then you should also hear some of the quiet ambient sounds and the approaching train starting at about 0:30. Keep it at a realistic level for a fly flying around your head. Then you will (hopefully) almost feel the air pressure from the passing train.
- 1:45 - 3:01: Outgoing train
(The tunnel itself is still missing at OSM, I will recheck the data and add it at my next visit.)
But I did not intend entering the cave (it's inaccessible), my point of interest was the tunnel, or, more specifically, the trains going in and out of the tunnel. My beloved had already told me that upon the Himmelreich there's a sonic space that is great for recording, but I started at the bottom. I sat down at the tunnel entrance, careful not to enter as that is strictly forbidden, and waited.
This was exciting, a great chance to test my recorder with a huge range of dynamics. I am happy to confirm, it succeeded. Again, this is a binaural recording. That means: Headphones are highly recommended to experience the real soundstage, which is more than just simple stereo but really has got depth and it's really possible to hear directions. Despite this was just a test recording, it turned out quite nice for a demo. But now I have an idea about positioning, recording levels etc., which will come in useful for the next time.
I created a composite track. First you hear me demoing the tunnel acoustics for you. Then you hear some insects, and if you can clearly hear them in a realistic level, you are OK.
Then the first train comes, approaching from the right. It's interesting, I was hoping that it may be audible when the train enters the tunnel, and it kind of is. The echo is kind of ringing out. You can even hear when it leaves the just 268m long tunnel because of the short echo.
The returning train caught me a bit by surprise, I hit the recording button a bit too late.
But I don't care for now, I will return, this was only a demo. I am amazed how clear the recording is, how detailed and ... how massive. It's almost as if you feel a bit of the air pressure just from the sounds.
I thought I had made a photo of the beautiful brick-built tunnel entrance, but obviously not.
And some more images from the Himmelreich, aka The Great Kingdom.