A full range speaker?

FYI.

All sounds made by musicians are notes in this post. Rimshots to tapping on a sound board to clapping hands. If it's part of the artists repertoire, it should be reproduced as a coherent whole.

Oh yeah, even saws and wash tubs…

@mijosytn,

Yes, the fs is 18.4 Hz. Acoustic Elegance is something of a ’Rolls Royce" brand of woofers for many different apps actually (sealed, IB, OB, etc) b/c John, up there in Michigan, takes the time to personally tune the design of each woofer for that particular app and that app only. He doesn’t go in for designing ’dual or multi purpose’ woofers...or off the shelf - he makes everything in-house to his custom spec. Full specs are here:http://http//www.loudspeakerdatabase.com/AE/IB18HT#8%CE%A9
I have the "Apollo" version here:http://aespeakers.com/shop/ibht-woofers/ib18ht/

Gotta laugh sometimes when I visit IB sites and start perusing through the mass graves of the unfortunate souls who have gone before and had fearlessly waded into the swamp waters of IB territory, having heard past tales of glory to be had on the cheap and armed with little more than a tape measure and a skill saw. The sites (like cult of the infinitely baffled and others) are strewn with examples of people who’ve made all kinds of ill-advised major surgery to their homes in an effort to DIY and ’save some money’. In the extreme some of them all but destroyed the resale value of their homes(!) And most severely underestimated the vibration problem. But, I salute those who posted their horror stories and have contributed to my sobriety of mind before taking on this project of mine.

So, going in, I’ve held few if any illusions about how easy an undertaking this all is. I’ve had the last 2 yrs to think things all the way through as much as I could even before I bought anything, let alone broke ground for construction. Many advantages in going for a standalone structure, don’t have to worry about sympathetic transmission to the rest of my house. It will be built on a concrete slab with the system front wall made of concrete block, all interior walls, floor, ceiling will be made of 2x12’s with walls and ceiling having at least a 3" space between them and the damped metal shell (room within a room construction). There will be the unexpected challenges I’m sure, but I will have to allow for that and come up with solutions as I go.

The 18" woofers should be ok. I’ve been using them in my living room in an OB config and their behavior so far has been exemplary. I know you’re referring to the sag as they age, but I’ve intended all along to rotate them once a year to keep the spider material from wearing asymmetrically over the life of the woofer. A calculated risk, as it were, as to whether or not that works, but I’m thrilled with their sound right now, we’ll see.

@mozartfan - I'm glad you found the chart useful.

There's also a comment somewhere above that sub bass isn't audible... sub bass is generally (perhaps not universally?) understood to reference the lowest two octaves which occupy 16-62Hz, most people can hear 20Hz and up.

millercarbon.  Like you, I do think that inaudible upper frequencies matter; however, I have a hypothetical question:  Is it possible that we do not necessarily know that our brains perceive this, and could these frequencies be used for directional location, i.e. placement of instruments.

The entire audible environment for Humans measure at 15Hz - 150kHz.
As pointed out - the ear drum cannot pick up those frequencies. Humans process sound utilizing more of the 30+K hair cells located within the ear which relay information to an extraordinary amount of nerve fibers within our nervous system that provide this info to the brain - which processes things like frequency, waveform, pressure rate, time and location - to what we actually hear. Everything counts, everything matters.

The only Speaker I know of that covers this range is The Lansche 8.2
15Hz - 150kHz.

a couple of other manufactures that measure in in the fuller range are
Marteen and Verity.