High Quality Horn Loudspeaker Systems

The book "High Quality Horn LoudspeaHorn Book Jacket V3 front w releasedateker Systems" by Bjørn Kolbrek and Thomas Dunker has been released this autumn. This website will keep you up to date on the availibility, signing events and so on. We will also add supplementary material to the book, and tell our story about how the book came about, and the process of writing.

Currently the book is available from Lean Business Audio (CURRENLY SOLD OUT) and Parts Express (CURRENTLY SOLD OUT). 

Latest News

Latest Update on Second Print Run

The corrected manuscript has been submitted to the printer, and we have received a proof of some of the pages to make sure the images print well. As some of you may have noticed, some of the pictures in the first printing were very dark, and this should hopefully now have been corrected.

The printer informed us that due to Brexit and Covid, some print companies have been forced to downsize or close, so there's currently a shortage of print capacity in the UK. CPI Print, which we use, also have an unprecedented volume of work. The lead time for the book is therefore longer than anticipated. It looks like production will not start up until mid or late January, with additional lead times in order to get the books out to Lean and Parts Express. We are sorry we weren't able to get the books ready for Christmas, but at least it's moving forward!

We will keep you updated.


Stock Status and Second Print Run

The book is now nearly sold out. The last few copies are on their way to Parts Express now and should be available on their website soon.

Thanks to everyone who bought a copy! 

The stock ran out quicker than expected, but don't worry: we plan to do a new print run soon. We wanted to correct some typos first, but these will just be minor corrections of mistakes. The content will be the same as the firt printing, and all important (factual and mathematical) corrections will be listed in the Errata section on this website. 

Parts Express is stocking our book

After a long process, Parts Express is now stocking our book! The book has not quite arrived in their stock, but should be there soon, and you can already pre-order. 


Mike Klasco has written a very positive review in audioXpress. (Please note that NTNU is in Norway, and that Bjørn started working for Celestion right after finishing his PhD.)

We are Discontinuing selling through Amazon

When we discussed the distribution of the book after it was printed, we settled on Fulfillment by Amazon (FBA), as this would simplify the process, we thought. And we expected Amazon to know how to pack and ship books. 

This turned out not to be the case. There have been several reports of books damaged in transport due to insufficient packaging. This is mainly for shipments to Germany and overseas. Unfortunately we are not able to influence how Amazon pack the books (when asking about if this was possible on the Amazon Seller Central forum, some people though it was quite hillarious...). 

We have therefore decided to end our Amazon sales when the current stock at the Amazon warehouse runs out, and we are looking for other distributors. Especially in the US. (If you are interesed in becoming a distributor, you can contact us here). The problem of insufficient packaging is also one of the reasons we are not selling on

In any case, the book will also be available from Lean Business Audio, and the list of distributors will be updated as they become available. 

We apologize for the inconvenience - we know Amazon is quick and easy, and have cheap shipping. However, it looks like you get what you pay for.

If you have received a damaged book:

First of all, we apologize for the issue.

If only the dust jacket is damaged, we will send you a new one for free, please contact us through Amazon. If the book is damaged, please organize a refund/return with Amazon, and we recommend to get a new copy from Lean instead. 

The Book