Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Mike Pyle]

http://forums.prosoundweb.com/index.php/topic,77717.0.html

[Scott Holtzman]

I came from an RF design background and I find it to be very valuable in understanding acoustical wave propogation.  Just like an antenna can have gain along one angle of radiation that gain is accomplished by altering the pattern of the antenna and concentrating the energy in the desired center of radiation.  A speaker does the exact same thing.  It has gain within the pattern so the SPL will be higher.  Some may equate that to farther travel but it is not be inverse square and energy conservation laws always apply.

[Caleb Dueck]

Take some good folded horn subs, like Danley BC or DBH.  Walk from 500' to 1'.  Indoors or out.  Let me know if any of that BS about waves needing distance to work correctly pans out.

[Stephen Kirby]

Dave Gunness spells it out right there.  It's the size of the radiating area in the near field.  Which matches up with my experience of large W horns or scoops vs. smaller quasi horns like the T18 or my CuboSubs.

[Scott Bolt]

My old CV folded horns had two very pronounced properties that I remember them for.

They were very "one note" boomy, and they were very loud..... oh and big and heavy

I never had the opportunity to have a folded horn las beautiful as the Danley

[Rob Spence]

I'm not referring to the one style sub having more throw than another style sub argument . My question about is short distances...not long distances.

I think this is more about "wave development"

I'm in the camp of "inverse square law is constant".

That's why it isn't the "inverse square suggestion" :-)


Sent from my iPad using Tapatalk HD

[Ivan Beaver]

That's why it isn't the "inverse square suggestion" :-)


Sent from my iPad using Tapatalk HD

But it is NOT consistent or "stay the same" at all distances.

Once you get past a certain point-based on the size of the device and the freq-it is, but up close it is not as consistent.

So "the law" only applies to certain circumstances.

[Len Zenith Jr]

This last Thursday we did a show with 4 PK sound Klarity 218's (direct radiator), and on Friday same venue with 4 Tuba 60's (folded horn). Subs in the exact same spot both nights and the same staff working both nights so I took a poll of everyones opinion and did some measurements.

Everyone was pretty much in agreement that the direct radiators "sounded" louder and had a bit more impact. Everyone was also in agreement that the folded horns sounded smoother and more musical and the word that kept coming up was that they sounded "cleaner".

My measurements told a different story. The direct radiators were pounding away at 128 dBc's (1 meter), and the folded horns were at a steady 132 dBc's (1 meter). Although the staff thought the horns sounded quieter, they were in fact 4 dB's louder. I attribute the direct radiators perceived loudness and "impact" to the harmonics given off and the fact that our ears are much more sensitive to the higher frequencies of the harmonics than the fundamentals. I also attribute the increased "throw" of the folded horns due to the fact that they were 4 dB's louder to begin with.

[Peter Morris]

This last Thursday we did a show with 4 PK sound Klarity 218's (direct radiator), and on Friday same venue with 4 Tuba 60's (folded horn). Subs in the exact same spot both nights and the same staff working both nights so I took a poll of everyones opinion and did some measurements.

Everyone was pretty much in agreement that the direct radiators "sounded" louder and had a bit more impact. Everyone was also in agreement that the folded horns sounded smoother and more musical and the word that kept coming up was that they sounded "cleaner".

My measurements told a different story. The direct radiators were pounding away at 128 dBc's (1 meter), and the folded horns were at a steady 132 dBc's (1 meter). Although the staff thought the horns sounded quieter, they were in fact 4 dB's louder. I attribute the direct radiators perceived loudness and "impact" to the harmonics given off and the fact that our ears are much more sensitive to the higher frequencies of the harmonics than the fundamentals. I also attribute the increased "throw" of the folded horns due to the fact that they were 4 dB's louder to begin with.

You are absolutely correct, that is exactly what happening  I also think those extra harmonics that make is sound louder in the near field tend not to sum that well in the far field. This impacts on their perceived throw.

[Jamin Lynch]

This last Thursday we did a show with 4 PK sound Klarity 218's (direct radiator), and on Friday same venue with 4 Tuba 60's (folded horn). Subs in the exact same spot both nights and the same staff working both nights so I took a poll of everyones opinion and did some measurements.

Everyone was pretty much in agreement that the direct radiators "sounded" louder and had a bit more impact. Everyone was also in agreement that the folded horns sounded smoother and more musical and the word that kept coming up was that they sounded "cleaner".

My measurements told a different story. The direct radiators were pounding away at 128 dBc's (1 meter), and the folded horns were at a steady 132 dBc's (1 meter). Although the staff thought the horns sounded quieter, they were in fact 4 dB's louder. I attribute the direct radiators perceived loudness and "impact" to the harmonics given off and the fact that our ears are much more sensitive to the higher frequencies of the harmonics than the fundamentals. I also attribute the increased "throw" of the folded horns due to the fact that they were 4 dB's louder to begin with.

But can you really get an accurate SPL reading from a folded horn cabinet at 1 meter?

[ProSoundWeb Community]