Getting the last octave in horns

[Djim]

* Seufz * und das sagt er jetzt!

 

[bappe]

If you listen to fast music, say 120 beats per minute, the beats are only 8.3 ms apart, lagging bass will screw with the timing and the music looses impact. Even at 60 BPM, 16.6 ms per beat, the timing will be off.

Sorry, but i have never heard music at this speed 🙂. 8.3mS makes for a beat rate of 120BPS, not BPM. The beats are 500mS apart for 120BPM and 1S apart for 60BPM.

Other that i would suggest corner horns in the listening end of you room. I have one 16Hz corner horn in my basement and i can take a picture of and post it, unfortunatly not until i get back from a business trip on the 4th of June though. Also remember to match the peaks and dips that you will get in the horn to counter act the room resonences in order to get really smooth responce.

BR,
Anders

 

[bjorno]

I am looking at adding a horn sub in my main system. I have plenty of room to build a 25 or 30 foot long front loaded horn but the mouth would have to be in the front of the listening area a few feet behind the main speakers. The concern is for the delay in the long horn so I have done a little bit of reading.

I do not want to use a delay line on the mains. From what I have read it seems that if the sub is crossed over no higher than about 60Hz the 8mS or so delay of an 8 to 10 foot horn would not be a problem and I would even be able to put one of this size behind the listening position eliminating most of even that delay but that would only get me down to about 30Hz give or take. This would no doubt be better than what I have and plenty for the 16' pedal stops and most other instruments but would still leave the 32' pedal tones absent.

So where does this leave me? How low of crossover point and how steep of crossover is necessary to make nearly 20mS of delay acceptable? Do I build a 30Hz horn and then catch the last octave some other way? I could add an IB sub but then if I am going to go with that much amplifier power and that many drivers then what is the point in the horn sub in the first place?

I could build a 30Hz horn and a 15Hz horn (There is room for both) and cross over to the 15Hz sub with a steep crossover at 30Hz. Certainly at that low of frequency the delay would be immaterial.

Of course one option would be to just be satisfied with a 30Hz sub and let the brain fill it in for me.

Thoughts?

Hi,

A little late but here is a TH suggestion that IMO should do the job as it's XO:ed at 40Hz using a LR4 HPF(-6dB at 60Hz) with a gldy(eventual amplitude ripple) that would be completely masked by the room and sufficiently low delay if used with overlapping mains.

b🙂

 

[weltersys]

Sorry, but i have never heard music at this speed 🙂. 8.3mS makes for a beat rate of 120BPS, not BPM. The beats are 500mS apart for 120BPM and 1S apart for 60BPM.
Anders

Speed metal, Anders 😀.

You are correct, I made a math error. When will we go metric for time?
That said, 1/16th note durations at 120BPM are pretty darn short 😉.

Art

 

[bjorno]

At that duration about 1.5 times the duration of a phoneme no frequencies(pitch) below ~100Hz can be recognized by normal human hearing.

b🙂

 

[doug20]

From time to time, people actually build these fantasy giant horns in their houses, and post pictures. But is there any good evidence any of them work nicely?
.

The DTS-10 Kit from Danley (still going on now for about $1300) is a 12Hz horn design with incredible clean output.

From 15Hz to 40Hz its hard to beat, nothing I know has that low distortion for $1300. Above 40Hz it gets a little more ragged that is where I think other smaller mid-bass horns help.

If the OP had the $$ then two of these would be sick and perfect for his room.

 

[mashaffer]

I don't have the $$$ and that is part of why I am talking building. 🙂