 ## High Quality Horn Loudspeaker Systems

The book "High Quality Horn Loudspea ker 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 (should have stock soon) and Parts Express (stock will be sent).

This page will list errors in the book. This will mostly be mathematical or factual errors. Grammatical errors or typos will not be listed unless they obscure the meaning of the text.

The errors have been corrected in the latest printing, unless the page numbers below are in red.

### Factual Errors

Page 353, Figure 8.3.1 is a photo of actor Richard Boone, not William Hartsfield. (Thanks to Mark Gander and Bill Geiger)

### Mathematical Errors

Page 501, Equation 12.15.11: the mu under the square root should be squared.

Page 551, Equation 14.8.4: This equation should be multiplied by 1/2.

Page 551, Equation 14.8.5: the Hankel function in the denominator should be of order n.

Page 551, Equation 14.8.6: U_n should read A_n (defined in (14.8.5)).

Page 595, Figure 15.7.16: figures are wrong. Corrected page here.

Page 601, Equations 16.8.8 and 16.8.9: the term 2*pi*f should be removed from the eg/(Bl*Qes) terms. The filter functions are correct.

Page 710, Equation 19.1.107: the numerator should be omega_0.

Page 750, The terms under the square root in Equation 21.1.3 should be squared.

Page 750, Equation 21.1.5: z_{n+1} should be r_{n+1}.

Page 750, Equation 2.1.6, alternative formulation: S_{n+1} = pi * (r_{n+1}^2 + h_{n+1}^2)

Page 803, Figure 24.5.3 has been calculated with a the parenthesis in Eq. (24.5.6) raised to the power of -0.5 instead of -1. The power levles in the figure are therefore too low. The equation is correct. Corrected figure here.

Page 842, Algorithm 2: Add cy <- y before the main calculation loop.