Wim van Kraanen Sound reproducing equipment and organ music
Het ORGEL 97 (2001), nr. 1, 34-36 [summary]

What sound reproducing equipment is fit for organ music? The answer depends on the properties of the stereo, the taste of the listener, and the acoustic circumstances in the listening room. This article deals with the stereo, in particular with the speakers and the amplifier.

The speakers have to reproduce very low pitches and should consequently be large. Electrostatic speakers are not to be preferred: the ‘image’ of the music they produce is not ‘wide’ and they are not fit to reproduce the organ’s deepest sounds properly. Dynamic speakers do better in this respect; a disadvantage is that they require a speaker for each frequency range. A two-way system (with two speakers) might be best: the number of filters, which have to divide the frequencies over the speakers, is in that case as small as possible.

We have to distinguish between transistor-amplifiers and valve-amplifiers. A transistor-amplifier controls the speaker better in most cases, while a valve amplifier, which has in general less power, is better with respect to detail and ‘airiness’. Because organ music requires large speakers, a valve amplifier with sufficient power to control low frequencies seems an appropriate solution.

Listeners who do not appreciate large speakers, may want to try so-called ‘monitors’: these are relatively small speakers that give a rather convincing impression of low frequencies.