bass horn with 128h

[more10]

if i use a unit with higher fs, wouldn't that affect the deep bass?

When building a horn, you should look for a driver with higher fs than the horns low cut-off. You also want a driver with low Q, a low Q driver will work below fs in a horn. You also want high BL, typically above 20.

A true horn will be very large, typically 2 cubic meters for a horn reaching 25 Hz and placed in a corner. In order to make the horn smaller it can be made more like a pipe, with a much smaller exit area, like the ones I linked to above. This type of horn will be bandwidth limited, but since you only want to reach 100 Hz, this might be just what you are looking for. But these "horns" doesn't like drivers with typical horn parameters, they like higher Q and lower Bl.

Since you are Danish, you can understand my thread Hornteori @ hififorum.nu, it has links to a lot of interesting horn stuff, especially the writing by Bjørn Kolbrek.

Mårten

[more10]

You also want to use a driver with a reinforced cone in a horn. The forces on the cone will be much higher in a horn than in a BR or a closed box.

[Lee in Montreal]

Why not simply build a pair of bass reflex cabinets with two 128h in each? The mutual coupling will add 3db in efficiency which could help those low efficiency drivers. Bass reflex cabinets are very easy to figure and take less space.