1215A Plans

[bowtie427ss]

Please understand i'm very much a novice in regard to horn design and theory.

I think since it's a proven recipe, and advice can be found here from first hand users, i'll stick with the full size 210 horn box.

What would the negative effects be from orienting the horn/driver in the mouth of the bass horn........ in effect a coaxial arrangement? Would that create a null on axis below the XO?

It's my thought that with a full sized 210 or 211 used in a vertical position, it would put the horn closer to an ideal height for a seated listening position. The smaller footprint is preferrable in my situation.

[GM]

Greets!

Hmm, a 511's centerline will be at least 65.32" off the floor if you cut the reflex section off, so you'll have to sit pretty far away for it to be at a good listening height. Mine are currently at 55" and require a ~25 ft minimum distance for good integration.

Considering the 511's shape and the 210's parallel sides, this would make for an interesting FR plot due to all the standing waves, reflections back to the throat, refractions, and of course the eddy currents generated by its mounting flange and 'cowbell' mouth which will in theory wreak havoc with the critical mids, but never having tried it or read about it, only one way to know for sure. Encasing it into a phaseplug shape would help quite a bit, but this would likely be a very time consuming project getting it optimized.

GM

[bowtie427ss]

Since the 511 is cast with 6 rugged mounting/hanging flanges, my idea was to completely remove the rectangular mounting flange, and cover the exterior of the 511 with a thin layer of open cell foam, hopefully making it as sonically invisible as possible. However, after a little more investigation and thought i'm just going to abandon the 210/211 idea for now. From a monetary standpoint, four decent 515's will set me back as much as a new pair of GPA's 604's and all the materials to construct 620A cabinets, and when complete they can live in the house with me.

[GM]

Greets!

FYI, open cell foam only absorbs acoustic energy and converts it to heat, so it won't make it sonically ~invisible, this has to be done via shaping, like for a supersonic fighter or world speed record car, etc..

Yeah, sounds like a plan, my 515s are now in 20 ft^3 cabs tuned to 16 Hz and don't miss the horns other than the 'look'.

GM