Hey guys...we need a little rallying here... - Page 112

I am no George Michael fan, but "You gotta have faith"!

This is like being on the ground floor of something totally new and exciting, and of course there are no guarantees (Tommy Boy comes to mind), but that is all part of the risk/reward.

I am excited to read this thread everyday, hoping to see the next step in this evolution and the compression drivers were just a bonus in my opinion.

Like anything in this world, this may not be for everyone. If there is that much trepidation and angst in buying these through these channels for some people, it probably is not worth their investment.

I am ecstatic for these systems to develop and only wish I had more talent in this area to help. I have offered what I know I can do which is help him pack and ship when things come in, heck I even have my own tape gun.

I was hoping the saying no good deeds goes unpunished was not applicable to this case.

Erich, I applaude you for you patience and your generosity. Some of this talk would infuriate me to no end.

Huh? WTH?

I'm not sure how my post went from "X" to being interpreted as "Y". I'll go back and just delete the thing.

No, I don't want my money back.... why would I want that? I want the SEOS units. I'm looking forward to building some speakers using them. I've been talking about them with friends and got them excited about them as well.

My entire postings were to get clarification on the *research* I was doing to try to decide what compression driver I was going to pair with all the cool SEOS units that I'm getting... I like to be thorough and fully weigh out all the factors for things, especially if it gets beyond a certain dollar value...

I incorrectly *assumed* that when Erich posted that the compression tweeters were ordered, paid for, and being built that he knew more about how he was going to do the selling of them to us.

Obviously this is not the case and I got ahead of everyone with my assumptions. Mea culpa on me and my apologies.

This has got *NOTHING* to do with a lack of faith in Erich or the project.

I know full well I can buy whatever I want. I chose the SEOS units. Again, all I was trying to do was research to compare these compression tweeters that are under construction and offered by Erich to other options out there to see which I wanted to buy. My apologies for getting ahead of things since things aren't fully finalized with them.

I have absolutely no doubt that I'll really enjoy playing with these new SEOS units. I wouldn't be here posting about them when I have 70 million other things I should be doing in my last few days before my first child is born unless I was excited about the whole endeavor. I'm beyond pumped about the project. Instead of rubbing my wife's feet as much as I'm sure she'd like me to (i.e. 24 hours a day hehehe) and getting to feel my little guy kicking around as I rub her belly, I'm here reading and posting about SEOS stuff and planning the different designs I'm going to build a few months from now when things get into a routine with the new baby. Sorry if I got ahead of myself.

Forget the whole thing I posted... I'll go back to lurking now...

I think it was just a simple misunderstanding all around. No need to into lurking.

Yes, things have been ordered and rolling along. The price of the SEOS-12 has been figured out and that part of the project is done. The CD's are just an extra thing I decided to try out while we waited. If it worked, great. If it didn't, well, it is what it is. But I got a little carried away and decided to ask someone for help. And now we've got CD's coming to think about! That's pretty much the extent of it.

Actually, as stated earlier, for the guys that pre-order, the SEOS price will actually be cheaper than the current cost because I've got a bunch of free shipping boxes and packing material. It's not a lot, but any little bit helps if you ask me. I didn't want to list a lower price because then everyone else that didn't follow this thread will wonder why the price went up to $28. So I put it at $28, even though they'll be slightly cheaper until I run out of free packing materials. I'll eventually get a photo of the box mountain in my garage.

It's funny because last week when I was building the test speaker box for Bwaslo, I was looking for my router. I looked over and saw a piece of red handle....."Oh, there's my tiller." Somehow I guess the mountain had an avalanche and buried it. Poor guy got boxed in....literally.

Are there pre-orders on the CD's yet or no?

I was looking at the site and didn't see any CD's at all. I was looking at building some outdoor speakers using the QSC 152i WG, Deltalite 12" and one of the CD's to complete the package. Then hopefully someone will come up with a crossover and then that will complete the build.

Where there going to be some sort of concrete WG's or something like that? Or am I just dreaming about something else.

Not yet, they will become available...stay tuned.


Size options for the "poured" version are limited at this time. More coming.

Erich H, Sorry they don't provide training for "cat herding".

I'm new here, as you can see by my post count. And I have spent some time looking through this thread, but it is confusing for beginners.

For example, I understand the SEOS, and have already paid for a pair. I understand what the BA means regarding the very large white high frequency horn. But there are other acronyms that are thrown around, which I am totally ignorant about.

One of them is 'CD', and I suspect it does not mean 'compact disc' either. Could someone clue we beginners in on what all the acronyms mean, and where we can go to read up on all this?

It would really help to accumulate all this in one place, and have it linked where everyone can see it. And if this exists already, I apologize for not knowing.

What does 'CD' mean anyway?

CD in this context means Compression Driver. Western Electric made an early version of it in 1928 but using an electromagnetic field coil rather than permanent magnets.

Thanks for the quick information.

Now, could it be possible for someone to show me where I can find the glossary of terms, along with links, which are socially acceptable here? It would go a long distance toward making things user friendly for newcomers.

Just a suggestion, of course.

Depending upon context CD could also mean constant directivity.

There is no GOT, just pay attention and/or ask questions and it ill all become clear soon enough.

For what it's worth, there's a small forum being set up to better deal with what will soon be a huge amount of info on this project. If it was all put on the AVS forum, it would flood the DIY area and that's probably not a good idea.

Imagine about 7 different sizes, then fiberglass, plastic, poured concrete. Flat packs, 1 piece baffles, and different designs for each one using different sized woofers and compression drivers. Way too much info to keep in one thread.

There was some extra info added to the very first post, but when I read it, I noticed some missing info, or graphs going with the wrong things. So maybe I will try to type up an information list somewhere to get everyone updated.

Consolidated info is coming.

Alright, tell you what we can do. Since you are one of the leading veterans here, "pay attention" to everything, and are an Acronym Expert,I am going to publicly address all of my questions to you specifically, just to show you that I am, how did you term it? Oh,....."paying attention".

I am officially going to make you my personal go to guy for everything I don't understand. And because you "pay attention" to everything, you can be my designated mentor here.

How does that sound? After all, I need all the help I can get, in order to "pay attention" more. Thanks a lot for stepping forward.

For those who believe "constant directivity" is a bit misleading, "controlled directivity" is more appropriate

I sympathize with your situation -- there is a lot of info here and it isn't well organized. But I don't think A9X-308's response was offensive, and you seem to have taken offense. Please just ask -- no need for drama!

-Max

Oh for goodness sake, do you think you could get your panties any more knotted?

As Max has already said, you have responded OTT without reason.

I actually gave you an alternate definition for the acronym, and I can see Raul's point too, but that is the most common way I have used the term in the decades of building horn based systems for home and PA. Semantic difference at best.

"Pay attention" simply meant that (almost) all of the info new members ask is already in front of them or easily found with a simple search, which should be your first effort in any new venture as that's where you'll learn best. It also means think a little about what you're asking before you do.

Then, if stuck, ask and you'll get better responses as veterans usually get bored with answering the same questions endlessly, especially if the answer is easily found. I also seem to recall that you said earlier you'd read some of Zilch's thread at AK, so both of those definitions should have been blindingly obvious.

As for you wishing me to be your guru, unless you can be trained fully to accept instruction without question (you will need years of ceaseless obedience and obeisance to prove this), and willing to join in large scale projects a la Fight Club, then you are of little benefit to my plans, and I must therefore at this time, regretfully decline.

I sympathize with jlk a bit. I too have found threads on here or on diyaudio that are hundreds of pages long, as all good projects tend to be, and felt overwhelmed at first even though I am not exactly a newb in audio/diy. Huge tip: always start at the back and to see where the most relevant up-to-date info is and then work backwards or use search to answer questions that arise.

This is no different here. The most relevant info is near the end, say pages 90 and up. The beginning of the thread has only the motivation and history of where this project started. Somewhere in the middle we came onto something we deemed SEOS and then it all went from there.

Or go to Erich's website, look up the products and then search for questions in the thread.

I also empathize with A9X. It gets exceedingly irritating to answer the same questions over and over when they have been asked and answered and a person could easily find the answer if they did some searches. This is akin to cheating off the smart kid's test because you didn't study.

A glossary of terms wouldn't be a bad thing. Maybe an article could be done here or on Eric's about-to-be-opened forum with a place to lookup terms, concepts and acronyms. And JLK would be the perfect person to begin assembling it, as he would know what terms are confusing him. The rest of us are so full of the jargon we probably wouldn't recognize a lot of it as being non-obvious.

I'll start it off:

CD = compression driver or constant directivity depending on the context. Compression driver is obviously the driver that mounts to the horn or waveguide and is typically responsible for the higher frequency register much like a tweeter. Constant or controlled directivity is loosely defined as controlling the dispersion of energy (SPL) both on and off axis in some pre-specified included angle.

OS = oblate spheroid(al). A geometric curve, in context of waveguides, defines the curve that starts out equal to the exit angle of the throat of a CD (see above) and rapidly flares out smoothly/continuously to asymptotically approach a flat wall/angle. (see blue "cone" in Figure 1) http://en.wikipedia.org/wiki/Oblate_...al_coordinates
The background comes from mathematical physics, where this particular coordinate system is useful in solving a class of Partial Differential Equations. Practical uses are displayed in submarine nose shape to be least detectable by radar/sonar.

SEOS = super-elliptical oblate spheroidal. Same general expansion of the walls of the waveguide from the throat to the mouth, but the mouth geometery is defined as a super-ellipse rather than a conical. This arrival came through supposition based on a collective of empirical evidence using some intuition about drivers of key aspects.

That is the basics, the rest is yours to fill in.

Alpha Niner--I hope you stayed dry during the recent flooding. I understand you set new records. Sorry I got off-topic. It looked pretty severe.

Thanks for asking. I personally was not affected beyond a couple of low lying (not that I'd really thought of them that way before) bridges that went underwater and so I had to go the long way around.

I have only seen pictures of areas that were seriously flooded. The thing that struck me repeatedly was the generosity of spirit and sheer effort many people put into saving their property and that of neighbours, friends and strangers.

It was quite an amazing summer.

Hi Erich, any time frame on when the DE250 clone will be available for ordering? thanks

Say what?!?

looks like things have been quiet last couple of days here. what's up?

Things have been ordered, boxes are being made, crossovers being worked on, forum being tweaked.

There won't be any preorders on the compression drivers, but they will be shipped here soon.

Erich,

Do you know if the mold for the poured SEOS-15 is done and if you can order poured 15s on the next pallet from Poland? I'm thinking for some of the TD15Ms I am trying to take over on the AE group buy that it might be better to give those a whirl with the bigger SEOS than the smaller plastic 12s...

I'm pretty sure they will be available. Still waiting on prices and things like that.

Erich,

Do you know when the subwoofer box flat packs will be available, and can you provide box/cutout dimensions, etc.?

Thanks......

Any day now. I talked to the CNC company this afternoon and will be meeting with him tomorrow to finalize a few things. I was suppose to meet with them today, but he had cancel. The bracing idea is the only thing I'm trying to get finalized. I've got an idea for a really nice bracing system that even a 10 yr old can put together, but it increases the number of interior parts. So I'm not sure if I should go that route or just cut a bunch of window braces and hope all goes well.

There will be a lot of different sizes available for a lot of different brands of woofers.

This hasn't been the easiest project, but once it comes together, you'll see why.