Hello forum members
I have a few questions regarding the Danley Soundlabs dbh218LC:
How do 2 dbh218lc 's coupled together compare to 1 th812 max spl wise and frequency respose wise?
Since it is a traditional basshorn, how can it go lower than a regular dbh218 or the LAB subwoofer (other Danley designs).
I thouht the mouth opening has to increase to go deeper? especially with the LAB sub it seemed all about using more together
to increase the mouth opening?
Does the frequency response lowers when stacking more lc's together?
How long is the actual hornpath for the lc version... or is that classified..
thanks for any response
Jan
To explain one of your points, a tapped horn is actually somewhere between a true horn and a combined-mode resonant pipe like the very old Jensen Transflex design. As the mouth size of the horn shrinks, the waveguide behaves more like a pipe with straight walls. At very low frequencies, the tapped horn is combining the acoustic impedance transformation principle of a horn with a comparatively less damped yet broadband pipe resonance from the superposed quarter and half-wave resonant modes in the pipe to maintain high efficiency at lower frequencies. In a typical folded horn, you extend the lower corner frequency of the acoustic impedance transformation by increasing the mouth size (usually by using multiple enclosures together). In a tapped horn you don't need to do this because the pipe-resonant action is gaining back the output 'lost' when the gain from acoustic impedance transformation begins to taper off.
The math for combining multiple tapped horn enclosures is more like the math for combining multiple conventional vented subwoofers; if you get anything 'extra', it's negligible. Also, tapped horn enclosures tend to be more efficient than bass reflex enclosures but less efficient than a comparably sized folded horn, with some of the sensitivity being given up to extend the low frequency output of the design. You get additional LF output from combining the folded horns, so there is a point where you actually achieve better performance from a quantity of folded horns than from the same quantity of tapped horns (supposing the enclosures use the same driver, with the same amount of available power; in the real world, refer to the spec sheets.)
