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 :

370x550x750mm (WxHxD)
152,6dm3 external volume

450x640x800mm (WxHxD)
230,4dm3 external volume

580x820x820mm (WxHxD)
390dm3 external volume

600x960x960mm (WxHxD)
553dm3 external volume

Prototype build pictures :

ROAR prototype build

size comparioson :

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Thursday, March 2, 2017, 17:48
Posted by Anders
This is the ROAR10, it is a 10" TPQWR design proposal.
Please note that this design has not been built yet, this far it reside purely in the theoretical domain.

HR input data from 3D:

FaitalPro 10FH520 HR input:

FaitalPro 10FH520 HR spl response:

FaitalPro 10FH520 HR displacement:

FaitalPro 10FH520 HR phase:

FaitalPro 10FH520 HR Groupdelay:


Parts overview:

Other driver examples:

B&C 10NW64

B&C 10FW64

18sound 10W500

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Thursday, March 2, 2017, 17:30
Posted by Anders
This is the ROAR12, it is a 12" TPQWR design proposal based on 18mm Plywood.

The ROAR12 has been built, and measured loaded with a B&C 12PS100, you can find pictures from the build below courtesy of Johannes Rodin, measurements will be posted as soon as the driver has softened up to give a more fair result.

Further tests and measurements needs to be conducted before we can make more definitive comments on the ROAR12 performance, but so far it shows a lot of promise and it sounds really nice, and much :)

HR input data from 3D:

B&C 12TBX100 HR input:

B&C 12TBX100 HR spl response:

B&C 12TBX100 HR MAX spl response:

B&C 12TBX100 HR displacement:

B&C 12TBX100 HR phase:

B&C 12TBX100 HR Groupdelay:


Parts overview:

Other driver examples:

18sound 12LW1400

FaitalPro 12HP1020

FaitalPro 12HP1060

ROAR12 build pictures (courtesy of Johannes Rodin) :

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Thursday, March 2, 2017, 17:23
Posted by Anders
This is the ROAR15, it is a 15" TPQWR design proposal.
This design has been built yet by yours truly.

HR input data from 3D:

B&C 15TBW100 HR input:

B&C 15TBW100 HR spl response:

B&C 15TBW100 HR spl response 88Hz:

B&C 15TBW100 HR spl response 45Hz:

B&C 15TBW100 HR max spl:

B&C 15TBW100 HR displacement:

B&C 15TBW100 HR phase:

B&C 15TBW100 HR Groupdelay:


Parts overwiew:

Other driver examples:

18sound 15LW2400:

B&C 15TBX100:

Beyma 15P100FeV2:

Driver hole pattern (for B&C 15SW115):

The otherwise unseen view:

Driver mounting envelope check (B&C 15SW115 geometry):

The quick setup:

The measurements below where take a in room, so don't stare yourself blind at the results, yet they should suffice as an indicator of the performance.

frequency resonance at the appreture ROAR15:

Distortion at the appreture ROAR15:

Complete system, bare in mind that this is a room completely devoid of any form of acoustic treatment, the ROAR's are gained up a bit from what I usually like.

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Thursday, March 2, 2017, 17:04
Posted by Anders
This is the ROAR18, it is a 18" TPQWR design proposal.
This design has been built and the DIY'er has reported good results, a picture from the build can be seen below.

HR input data from 3D:

Beyma 18PW1400Fe HR input:

Beyma 18PW1400Fe HR spl response:

Beyma 18PW1400Fe HR spl response (additional frequencies):

Beyma 18PW1400Fe HR displacement:

Beyma 18PW1400Fe HR phase:

Beyma 18PW1400Fe HR Groupdelay:

Parts overview:


Build picture:

B&C 18SW115

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