ROAR family overview 
Thursday, March 2, 2017, 18:02
Posted by Anders




The ROAR designs are all made up of a constant area tapped system coupled with a quarter wave resonator, the TPQWR abbreviation aims to describe this as Tapped Pipe (constant area segment) + Quarter Wave Resonator (another constant area segment).

In theory this results in the passband range of a tapped constant area system (wider then its corresponding TH) with a in passband efficiency grater then that of their corresponding TH equivalent.

Regarding the naming, putting together a name based on the design principles involved proved to be an impossible task, so we opted for Johannes Rodin's surname initials and something that described the prototype build characteristics.... ROAR! :)

ROAR15 and ROAR18 is IPAL compatible!

With only minor adjustments to the original design the ROAR15 is 18IPAL compatible, as is ROAR18 with the 21IPAL, according to simulations, the adjustments required is limited to adapting the driver cut out, adding some additional rear panel bracing and in the case of ROAR15 an upward offset of the mouth brace by approx. 20mm.

Please note that the only ROAR design that has been built so far is the ROAR12, and it shows a lot of promise, you can find pictures in the ROAR12 link below, courtesy of Johannes Rodin.


Links to ROAR design proposals intended for professional use :

ROAR10
370x550x750mm (WxHxD)
152,6dm3 external volume



ROAR12
450x640x800mm (WxHxD)
230,4dm3 external volume



ROAR15
580x820x820mm (WxHxD)
390dm3 external volume



ROAR18
600x960x960mm (WxHxD)
553dm3 external volume



Prototype build pictures :

ROAR prototype build



size comparioson :


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