There's a laser distance measuring device from Bosch with built in incline measuring aka electronic level. Not too expensive and useful for many other things as well.
http://www.amazon.com/gp/product/B005AZZNXE/ref=as_li_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B005AZZNXE&linkCode=as2&tag=cubiculumsyst-20&linkId=BE6RN3HLUWWGVJYK There's also a bundle with an aluminum bar that turns it into a level, but for this purpose the device tripod-mounted would be good enough, as long as the tripod head has markings for the horizontal angles. Ronald Sent from my mobile phone > On 11 Jul 2014, at 20:43, Marc Lavallée <m...@hacklava.net> wrote: > > Hi Steve. > > I understand your problem. I have a similar one; in my case the > calculations and the installation were easy, but I'd like to measure > the exact angular positions of the (installed) loudspeakers. > > First you need the angular positions of the loudspeakers from > the listening spot. It shouldn't be too difficult to calculate for your > layout, knowing the properties of the dodecahedron (and some > trigonometry). > > Then you'd need some tool to report the angular positions on the > walls, ceiling and floor, as seen from the listening spot. It could > also be used to measure the installed loudspeaker positions. > > I suppose it could be made with a levelled tripod that can display > horizontal angle positions, a "tiltable" plate with and inclinometer (or > clinometer) to display vertical positions, and a laser pointer to > report the positions, making sure that the pointer is perfectly > installed on the plate and that the intersection of both axis is at the > listening spot. For the distances, a soft measuring tape could be > attached to the end of the plate. I hope it make sense... > > I found a few clinometer apps for mobile devices that are cheaper > than digital clinometers. There's also analog clinometers (like those > for satellite dish installation), and it's possible to build one. > > Maybe there's an easier solution. > -- > Marc > > Fri, 11 Jul 2014 02:00:25 +0100, > Steve Boardman <boardroomout...@gmail.com> wrote : >>> You can use "golden rectangles" (of ratio 1/1.618) to calculate >>> placements of your speakers. You can refer to: >>> https://en.wikipedia.org/wiki/Icosahedron >>> https://en.wikipedia.org/wiki/Dodecahedron >>> https://en.wikipedia.org/wiki/Golden_rectangle >>> >>> -- >>> Marc >> >> Hi Mark >> >> Of course, but not sure how easy this may be in practice. >> Would I use the first golden rectangle on the smallest plane, and >> intersect the others with that. Then use each rectangle corner as a >> line from centre until it hits reaches a wall and then mark the >> speaker position? The problem I have is the room has a sloping >> ceiling, low at front and then high at the back. I would prefer to >> extend the angles and attach speakers to the boundaries rather than >> build a frame to hold them, as that would use up space and become an >> obstruction. It is also easier to attach to walls and ceiling. I was >> thinking of having the face of a Dodecahedron on the floor. This way >> there will be less obstruction in the room and I will only have to >> embed one speaker in the floor (i'm using both the vertices and faces >> of dodecahedron). Does anyone know of a simpler and maybe more >> accurate method? >> >> Thanks >> >> Steve > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit > account or options, view archives and so on. _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
