The Othorn tapped horn - Page 2

Hello Josh

I agree that the box is not optimally tuned.

If you play with it you can maneuver things a bit.

The peak actually is the most efficient point in the drivers output in this size of an enclosure.

Put a high pass there and your golden.

Attachment 218928

This is the output at one kilowatt.

Notice the dip in the cone excursion at 30 hz.

Your design is more efficient in that the area where most of the mid-bass transients are. About 3 to 4 db more efficient. No small feat to be sure.

I guess I'm a bit thick when I don't get the pack up and go home part.

And my involvement in the SDX15 prototype is advisory. It's not my design. I'm there to make sure another set of experienced eyes looks over the numbers and such.

As for cooking.

All high efficiency stuff.

In the high 90's and up.

So I have some sharp pencils.

And I direct your attention to my first post in this thread.

You did a very good job at what you pulled off.

I dont exactly know what vaporware is?

I could just get a regular EPX2500 from Behringer and some sort of DSP with Hpas but wondered what you thought would do the trick. I like the Behringer stuff but also like the LG clones. Those are the best deals for me for amplifiers.

I was also confused on the ported sim there on the ported vs TH. I never noticed where the ported was better than the TH?

And how would you move a sub like this Ricci?

I haven't had a big commercial like sub like this in 12 years. I would want to move it every once in awhile. I didn't notice any handles on DSL TH's either so I wondered. Do most just set it up once and then never move it again?(TH)

Just to be clear, the 1600 and 3000 non-DSP units have been out for some time.

I have a 3000 and like it, and it meets the power spec down to 10 Hz.

Where's the prototype OTHorn?

JSS

That's me trying to get the biggest bang out of the smallest buck.

Have a nasty need for a 20hz FLH behind a CBT.

Attachment 219009

Attachment 219010

Like I said. A little busy!

Mark

I was looking at a revision of one of my designs and this made me

Hmm, I thought max theoretical efficiency of a horn was 50%, but maybe resonance can exceed that at specific freq.

Ouch!

On a front loaded horn with a properly sized rear enclosure you end up with a balancing pressure. It works a little better in some ways.

With a tapped horn your on your own. The woofer will be shredded wheat at those pressures.

Methinks that the theoretical maximums should have a talk with the pressure maximums and come up with some sort of compromise.

Then they can all be happy together.

Keep this in mind.

We have a very powerfull piece of kit here in the new additions.

Many designs that look good to begin with will take a beating.

But you still squeezed out about 3 to 4 db out of the drivers passband where the greatest bass transients are located in real music. So figure out where the maximums are there and you still have a really killer sub.

Mark

The <20% in the passband was the cause of

As it turns out, I think it's OK.

Nope, that's a 2pi graph.
It's not so good if you mouth cannot support the pathlength, so this is 4 100+dB/W subs v-plated.

I have some good news for you Josh.


1 pascal = 0.000145037738 pounds per square inch.

Your pressure is not that high. Not all that bad.

2.08 PSI peak. Surely that overgrown cone can handle that!

Mark

I've had a pair of the first generation running since late last year. I can hardly imagine adding the second pair and the slightly stronger/deeper lows it will bring. This second generation is to clean up the corners and add handles, wheels, and feet. If it turns out as expected, I may try to get a flat pack kit produced.

I am using this as a oppertunity to earn my CNC merit badge

If it turns out good it's a possibility, but it'll be a while before the details are settled.

r u sure? what max voltage and excursions are you comparing?

Ricci, would the B&C 21SW115-4 be suitable ?

Not rocket science.

You are perfectly capable of duplicating what I did.

Take the box volumes internally and port it to the same Fs.

Then run the sims.

Yes there is a large peak on the low end.

But that is to be expected in a grossly undersized enclosure.

WHat the usefullness of such an exercise is to prove or disprove the basic merits of a design.

That Ricci was able to attain a good response curve and keep the size as small as he did was one thing to be happy about.

The second thing to praise is the gain of 3 to 4 db.

That is a doubling in efficiency over a vented enclosure the same size.

Overall a good compromise in gain over enclosure size.

My only criticism comes from the standpoint of horn versus vented box. I have a self imposed rules that to call something a horn requires about 7 db of gain. Most tappered quater wavelength designs will cough up 3 db in gain.

Mark