Welcome to my place!

Audio Resource Jan Didden

It's great to have you here!

This place is where I talk about my personal projects, interests and whatnot. Not necessarily related to audio, although it often is. Under the Musings button you'll find things related to perception and conciousness which of course are very much applicable to audio!

My library lists lots of (historic) audio papers and studies that I personally find important to understand many different issues in audio.

I also have collected the interviews I've done with audio luminaries. Take some time to read and digest them - there are very interesting and worthwhile gems in each of them! My projects however is audio stuff - things I designed, wrote articles about, and my personal system. Comments and remarks are always welcome!

Last but surely not least, let me mention my publication Linear Audio. Published twice per year, over 200 pages of technical audio related articles from international authors. Article abstracts and author bio's can be read at the website, and some articles are available for free online.

So, take a look around, explore the various areas and let me know what you think!

The Rocket sub

One reason for this project (beside the other 50 projects I'm working on ;-) ) is Floyd Tool's book "Sound Reproduction" where he discusses multiple subwoofers in a room to diffuse or spread out room resonance modes to greatly improve low frequency response flatness and accuracy. There is also an excellent thread on this subject here, where, among others, Earl Geddes offers an empirical method to set up such a system with multiple subs.

The cone is about 80 cm high, with an internal volume of some 78 liters. I have designed a wooden adapter ring that accepts the excellent Peerless XXL 12 inch woofer. I had them painted in a body shop in BMW Arctic Gray...

A word about the enclosure: these are rejected missile nose cones from the HAWK air defense missile system. The material is glass fiber, about half an inch thick. They are very stiff constructions and yet relatively light (which is good if you have to loft it up into the air!). They have a resonance at about 1kHz; this frequency is well above the cut-off frequency of about 80Hz so it will never be excited. I've been using them for several years now and they produce strong, well controlled bass with an elegant form factor. Swords to ploughshares, isn't that the expression ;-) ?