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What would be most interesting would be to capitalize on the possiblity you have to make use of the basement volume as an enclosure for the lower-bass channels. This wold however, almost certainly introduce floor vibrations requring that you find a way to float at least your turntable, if not the entire system, in space.

Romy wrote:

"...The "end of life" lower-bass channel in my view is not some kind of very well and ambitiously-made lower-bass transducers, enclosures and amplification, but rather a good lower-bass channel [is] very ambitiously and very strategically placed in a given room..."

"...A proper lower-bass channel shall not work against the rest system and against a room, so the positioning and its output might be defined before the construction..."

Positioning: Assuming you don't use the basement as an enclosure: Build the enclosures on wheels (for carpeted floors; large diameter, wide wheels).

Output: Given the possibility to modulate amplitude independently of the other channels, I'll assume the variables left to consider to be the following:

1 -Size of driver (multiple pairs of 10"-15" vs a single pair of 18"-24")
2 -Type of enclosure (fixed position, possibly vented, possibly located in the corners vs mobile sealed enclosures, vs making use of the basement as an enclosure)
3 -Type of amplification (Good SS vs ?)

"...at this point have no idea what would constitute the "end of life" performance status for bass in my room..."

Here is my possibly over-simplified view:

Assuming one will not get anything under 50Hz (usable) from a 40Hz horn, I interpret the mission of lower-bass channels in the context of a horn system as follows: 

To handle everything from 60Hz and below, producing a quality of lower-bass compatible with the mid-bass horns.

This for me meant large, sealed (easily repositionable) enclosures.

Driver size: For sound below 35Hz, in the context of an all horn system, I do not subscribe to the multiple, smaller-diameter drivers approach. My reasoning (certainly open to debate) is as follows: The multiple, smaller-diameter drivers appraoch, if it is really to produce sound of useful amplitude below 35Hz, would likely require a ported enclosure. Some of the gain in quality associated with the smaller drivers would thus be sacrificed in the interest of quantity (amplitude); a difference likely rendered more perceptible in the presence of mid-bass horns. If there is no requirement for sound below 35Hz, the multiple, smaller-diameter drivers appraoch might be better. After having lived with it, I would not want to go without the 18-36Hz octave.

jd*

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