References:

- http://www.d-s-t.com, Danish Sound Technology website, specifications and applications for Peerless woofers.
- http://www.ht-audio.com, BassBox Pro 6 software, used to model the subwoofer in different enclosures.
- http://www.ijdata.com, LspCAD 5.25 software, used to model the subwoofer in different enclosures.
- http://www.intertechnik.de, German loudspeaker DIY website, featuring a subwoofer design using the XLS10.
- http://www.speakerenco.nl, Dutch loudspeaker DIY website and shop.
- http://www.audiocomponents.nl, official Dutch distributor for Peerless, Vifa, Seas, etc.
- http://www.hypex.nl, Class-D full range and subwoofer amplifiers.
- http://www.thommessen.com, subwoofer amplifiers.
- http://www.diyaudio.com, excellent do it yourself audio forum.
- http://www.madisound.com, US distributor for Peerless, Vifa, Seas, etc.

Credits:

- Titus Nissen at Speaker & Co for his expert advice, tips and suggestions.
- Rolf Smulders at Audio Components for supplying us with the needed parts and his advice, tips and suggestions.
- Ingemar Johansson at IJData for supplying us with LspCAD 5.25 and his advice, tips and suggestions.
- Harris Tech for supplying us with BassBox Pro 6.0 and X-over Pro 3.0.
- Jan-Peter van Amerongen at Hypex Electronics for supplying us with the needed parts.
- Gerd Lommersum at ASE for supplying us with the needed parts.