ULSI stands for Ultra Linear Stereo Image. ULSI is a new stereo technique invented and developed by Erik Sikkema and propriety to Erik Sikkema Studio. The technique was mainly invented to overcome the general problems of most common stereo techniques in organ recordings, but the effect is successful on a wider spectrum of other instruments and combinations.

Advantages of ULSI in comparison to standard stereo techniques are:

1. More natural sound balance in the lower octaves and a more precise stereo image.
2. Less low frequency disturbance from harpsichord-, piano- and organ keyboard and pedal actions.
3. A more natural dynamic behaviour.
4. Singers and instrumentalists blend better together without any spot microphones at all, which improves the stereo depth enormously.
5. No hearing fatique, no pressure on the ears.
6. Listening with headphones, gives a very pleasant sound, very similar to Dummy Head stereo recordings.
7. Enjoyable also on very low listening levels of your amplifier at home.
8. Sounds also very convincing on simple and cheap equipment.

 

Listed below are the recordings that employ ULSI technology.