titian said:
...
Low frequencies here are really no problem for me. Organ music here sounds very very close to what I hear in the churches here around. Tones heard the Passacaglia and the Toccata (dorisch) here...
Frequencies under 16 cannot be heard. 16 Hz gives a very unpleasant feeling.
With all due respect, I think that is impossible. I know you have an exceptional system that sits in a large room.
However, to get the true sound of an organ (unless it is very small, but even if that is the case)
at home your ears would just burst. In the rare cases where the organist sits with his head aligned with pipes, playing is a nightmarish experience.
That is because even if a system is perfect, you just cannot have an organ in a room, unless it does have neither mixtures nor a strong 16 foundation. My experience tells me that you can have, in a moderately big room (say 10x8x4) a more or less complete organ, of this kind:
Great:
Principal 8 (very soft)
Spitzflöte 8
Octav 4 (again soft)
Superoctave 2
Quint 1 1/3; or mixture III, soft and ending at 4, 3, 2
Regal 8
Manual II
Rohrflöte 8
Spitzflöte 4
Nasard 3
Open flute 2
Terz 1 3/5
Pedal
Gedeckt 16
Open flute 8
Open flute 4
Fagot 8, or 16 if rather soft
Pull downs
Now, with the big organ of St. Jakobi, for instance, the lowest open principal 32 is 1,5 meters wide; the Posaune 32 is extremely strong; the mixtures (the Positive's especially) are extremely penetrating.
Admitting one has a room about 15x8x6 you cannot really have that kind of sound. In such a room even a loud harpsichord will sound too loud after prolonged and close listening (the listener actually gets louder sound than the player does).
Therefore, the result is that you will have to lower the loudness of the sound. Because of the way our ears work, that will implicate a balance shift: the basses and high treble will be weaker. Of course, if you actually have an enormous room, about the size of St. Jakobi, with a perfect system, you will certainly have the illusion. I have had such an experience, and I was convinced that hi-fi could sound realistic. But it was at a concert hall, playing Stravinsky...
I don't mean to diminish your, by all accounts, perfect system: I only want to point out that what one gets at home is almost always a reduction of the real sound (with your system, I believe that piano, harpsichord, string quartets and small choruses would be realistic).
And, really, one cannot listen a 64 foot. Your assertion is correct, as far as I know: no hearing under 20 Hz (some persons do hear, though, even if I do not). Why bother with a 64, then? The fact is that one does have the sensation of extra bass. That is explained by the difference tones Helmholtz discovered: If you play (in perfect tuning) C G c e g c', you will listen to CC. This is because all the CC harmonics are there, and our ears and brain will reconstruct the sound from harmonics. Therefore, if you have a 32' and a 22' you will get the impression of a 64, even if you can definitely not recognize pitch; for that you will need the upper tones, which are audible and recognizable.
Vogel has also recorded Clavierübung III.
