OT: Crossover dampening options

[LowOhms]

I am interested in the science behind the wire length thing. Is it that multiples of 57.125 are good for a certain frequency? How does that apply to the whole audio spectrum?

I know the military has researched high and low frequencies as a sort of "audio warfare". Frequencies so high they make you sick or so low they cause other things (think brown note).

I'm curious how this all affects me playing Rush on my Altecs.

The compromise length was for the whole spectrum. All his speaker wires and interconnects were multiples or divisors of the basic 57 1/8 th inches. In early 2016, my friend Dennis Fraker ( Serious Stereo) confirmed this, through listening tests done on his state of the art GPA 604 home system, so I did get his independent confirmation, decades later, that "I" would trust.


Low Ohms........................ Jeff Medwin

[gdmoore28]

Hmm, without doing the back reading, this 'sounds' like phase shift in a conductor due to skin depth, so for anyone with higher math skills than me that can work it out........ in which case it sure would be nice to make some sort of chart or very simplified math routine for us math challenged types to make a more informed wire size/type choice: Electromagnetic Wave Propagation in Conductors

That said, cinemas, stadiums, etc., wiring charts for audio speakers, amps, etc., can run into the miles with no obvious degradation of signal except for HF loss due to inductance if long enough, so not sure any of this can be perceived by humans.

GM

Very interesting link, GM! But my mind will not completely wrap around the implications, so I have to agree that a chart of some sort is called for! Nonetheless, now I know what "skin effect" is.

GeeDeeEmm

[GM]

i heard GM researched low frequencies one time, made his house sick.

Big time and still suffering from its effects. One thing's for sure; as long as I live here I won't be able to utilize all of some movie's LFE or do pipe organ symphonies with 16 Hz pipes at ~ live output and maybe even 32 Hz now that the sub systems themselves have shrunk enough to ~comfortably fit in the room.

GM

[Phil-G]

Big time and still suffering from its effects. One thing's for sure; as long as I live here I won't be able to utilize all of some movie's LFE or do pipe organ symphonies with 16 Hz pipes at ~ live output and maybe even 32 Hz now that the sub systems themselves have shrunk enough to ~comfortably fit in the room.

GM

I've seen the pictures. did you lose the battens under the plaster?

[GM]

No plaster, this house is one of the first new homes built with drywall in the metro Atlanta area [all 3/8" thick and crumbly], which as it turned out is quality wise nowhere near what was being sold when I had to replace it.

The real damage was the shattered concrete block pier under one speaker and the other cracked ['floating'/suspended floor] with one near the centrally located floor furnace busted enough to cause the major roof load bearing wall to sag several inches. Fortunately, a DIY wood I-beam, some pipe clamps and a early '60s Craftsman 1.5 ton mechanic's floor jack made short work of it, holding it until I could put in proper trusses in the attic; quite a feat considering the roof had three layers of shingles, roofing felt on it, though did blow its seal the next time I used it to jack up a vehicle.

I assumed such a heavy, composite structure would have a very low Fs, but more recent room gain measurements shows it's in the 14-16 Hz range, right where the cabs are tuned, so obviously way more rigid than I'd thought possible based on seeing how easily a mini-twister can destroy one.

GM