History

"Jericho 08" in HOBBY HiFi 2/2008
Fullrange horn system with Ciare-driver

"The bass horn was designed with AJHorn. In addition to the area at the beginning and at the end of the horn and the horn length this simulation program offers the possibility to take into account the influence of the pressure chamber and the absorber chamber, that can be used to swich off troubles in frequency response."

"... That a pressure chamber has sometimes more disadvantages than advantages shows AJHorn: there is at low frequencies with growing pressure chamber a more wavey response of sound pressure. This one can recognize as a lack of low frequency volume ... therefore the version 08 of the Jericho-Horn does without a pressure chamber."

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"Gradient TL" in HOBBY Hifi 6/2006
Low frequency simulation

"...The HOBBY-HiFi-editional staff uses - not only for transmissionlines - the Simulation program AJHorn as an essential tool. With its help it was possible to design a perfect low frequency line for the W160AL8.
... without computer simulation the optimization of a transmissionline wouldn't be possible in such an easy way."

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AJHorn 5.0 test report in KLANG+TON 1/2006
5-pages about the simulation possibilities and comparison of theorie and practice

"... The most important prerequisite, of which Jost made during writing the software: All usual housing types, i.e. sealed, bassreflex, bandpass, transmissionline and horn, are not fundamentally different, but rather only variants from one another. ... That is turned out on the first view a rather unusual view angle, in nearer view however it is very realistic.

... Not the software does determine the correct values for the housing, but rather the user himself. ... One learns... already within short time very much about how the behavior of the box changes, if one changes the various parameters. And can on entirely comfortable way checking some far common theories without having cut up only one piece of wood ..."

"... Altogether the anyway already very practical and helpful AJHorn became through the reforms in the version 5 more valuable and more universal, wereby working with the software fortunately not suffered."

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AJHorn 4.0 in Hobby Hifi 4/2001

"... the program may probably be called in its type singular. It supplies realizations for the horn and TML building hardly achieved in other ways and is thereby an indispensable aid for the ambitionierten loudspeaker hobbyist. "

"... The simulator routine AJHorn, with whose assistance the housing sizing took place, calculates the transient characteristic of transmissionline and horn loudspeaker housings astonishing accurately... The work with this program leads to realizations, which the classical transmissionline teachings after Bailey do not give : Thus astonishing we found a very short and itself extremely tapering line for the 10 BGS 119/8 as optimal ... Thus it succeeded to shorten the transmissionline to a length of 70 centimeters and get along with approximately seven litres of net volume. The result convinces and astonishes: 50 Hz achieves this construction, that is as deep, as one knows it from attained full growth HiFi constructions. "

AJHorn 4.0 test report in Klang+Ton 4/2001
Juergen Heinzerling asks: " all horn, or...? "

"What convinced me at this software, were " the reasonable " results, which deviate remarkably from the prophecies of other programs... Where other programs suggest smooth processes, AJHorn uncovers tunnel resonances and other " obscenities " , which can be measured at the prototype... Already after the first mouse-click at the Button " Start " it becomes clear, how global the revision of the program is. On my stationary 800-MHz-PC with AMD chip it hardly takes more than one eyelid impact, around which the result is on the screen... The program runs expressed stably, and the improved input dialogs permit an extremely brisk operating. " " people who are busy with horns simply have no other choice than this program. In addition, for other sound guidance it is at present the only solution to obtain over expressed results with minimum inputs in line with standard usage. "

March, 30th 2001: AJHorn available in English

Sept., 07th 2000: Klang+Ton sketches CT 185 by AJHorn
From K+T 5/2000: Doubt about the correctness of the simulation eliminated.

" Back in the measuring laboratory we let our finished structured box ( CT 185 ) "hum" immediately into the microphone, because, quite honestly, we trusted the simulation results not so completely; the result surprised us for the second time: a light bass emphasis below 150 cycles per second with which we can live, but as calculated a lower cutt-off frequency of 60 cycles per second... With a few into shape-cut wood-pieces we halved the front chamber volume, whereby the horn rose as expected louder, however unexpectedly the lower cutt-off frequency rose to almost 80 cycles per second. Complement, Mr. Jost, your simulation forecast us the same tendency. "

 

March, 31st 2000: AJHorn test report in Klang+Ton 3/2000
Juergen Heinzerling over the end of the incalculability.

"... both for TML and for horns so far no throughout satisfying electroacoustic model could be created, that the processes within the sound guidance makes to some extent foreseeable.(...)
AJHorn offers an acces to an area, which can be handled relatively easily, which can be investigated normally only by toilsome and time-consuming attempts. The program acknowledges long preserved presumptions, but it raises also new questions, which I after more than two decades of the occupation with this topic I see as a positive side effect.(...) "

 

Nov., 19th 1999: AJHorn in Hobby Hifi 1/2000
Bernd Timmermanns compares simulation and measurement of the mini TL.

"... A new calculation program supplies responses to this so far only on the laborious way of practical experiments of solvable questions: AJHorn calculates TML and Horn loudspeakers with remarkably realistic results. Quite besides: As border line of a very short TML with large pressure chamber a bass reflex loudspeaker results, and even AJHorn simulates this applicable.
Hobby Hifi calculated the mini TL with this program; the results speak for themselves: The measurement acknowledges the result of the computer simulation with AJHorn: The simulator routine models the measured transfer curve of the undampened TML phaenomenal accurately.
AJHorn offers the possibility of defining a damping separately for the first and second half of the sound guidance... If the TML is strongly dampened (...), then the response curve smoothes itself to a large extent. "

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