Reed Exodus Anarchy 25hz Tapped Horn - Page 3

7" wide subwoofer with a 6.5" driver ($70) that does 25Hz to 100Hz flat? Isn't that pretty cool stuff?

yeah, penn, i agree. i'm just thinking in terms of traditional size/cost/complexity/extension/maxspl etc.

The biggest issue with a double-width cabinet? For me personally, it is bracing the %&*(%^* thing when I build it, which would be required with a 14.5" baffle width. The single-width cabinet does not need bracing. Two single-width cabinets would be a faster build, and offer more placement options.

MaxSPL is my biggest question mark.

I have little SC-8s from Velodyne. I love them and I can throw 500Watts at them (they use the SC1250 amp). I know they have been measured though and I think even they have issues above 105dB. They do measure down to about 28Hz and play up to 100Hz.


They are 10x8x10 so that is good performance for their size and they cost around $90 each from ebay last year. Hard to beat in this category.

I tried to clarify my ideas behind this design earlier. Over at AudioKarma, Zilch and the folks have some collaborative DIY designs, one of which is the Indignia. The Indignia is a very listenable speaker, yet is a very affordable project, and is simple enough that it is possible for someone new to DIY to build. Well, like most of the smaller speakers on the planet, the Indignias needed a sub to really sound their best. Hence, Insubnia was born. This tapped horn is an offshoot of the Insubnia project.

If I recall, the Indignia's are about 85-87 dB 1W 1m, so I don't need a crazy efficient sub to match well with them. They don't take a ton of power, so a 105 dB limit was fine. Since I could compromise SPL, I chose to go as low as I could and kept it as small as possible. The Exodus Anarchy is a great fit in this regard, as it has a relatively large XBL2 motor and a tiny little cone. The rest of the driver's parameters provide a good fit for use in a tapped horn too.

Now - is it practical? No, probably not. Since when is audio ever about practical? Sure, a cheap 12" in a 3 cubic foot ported box might provide a similar response for far less money in a simple box. That was not my intent.

This build is an easy way for anyone to play with a tapped horn. Sure, the driver costs a bit, but it is still a ~$200 build all in, with one of Jack's amps driving it. Is it cool? No doubt. Did it hang with the JTR's you see in that pic near the front of this thread until we got way past the recommended drive levels? It did just fine thank you, and better than I anticipated.

I initially designed this to see if I could. Once I mentioned it on several forums, people started asking about it, so I figured there was a little interest. I finished the design and developed a nice fold, Radman12 took the plunge and built one, then I measured the results, so here we are.

So - really - what is this for? It certainly will not work in a big home theater setting, at least not alone. Four would be a good start, and there still may be headroom issues. I really designed it for someone like me to use in a secondary system. I like my bass with movies and music on my primary system, and I miss the low end when I am listening to other systems that do not reach as low.

This would be pretty cool to stack 4 or 8 deep in a car.

Sorry I missed this.

Any good 1/2 inch thick material should work fine for this build. We optimized the cutsheet for 5'X5' baltic birch.

1/2 MDF should work fine. I used BB because I do not like breathing MDF dust. Arauco ply will be fine too.

Thanks man for the info. Great thread BTW w/ lots of detail.

Thanks for taking the plunge Radman! Have you tried it with the mouth of the horn facing the corner?

I just finished ordering the woofer and since I have an extra sheet of ply laying around this is going to cost me next to nothing to try. I'm actually trying to sell my Tuba HT because it's just too dang big and I will never use it anywhere near it's potential with a toddler in the house.

Nice read, and I'm thinking about building something my self and this looks like a good project. Coming from the commerical sub world, the DIY section is getting very interesting especially with little wonder. With the foot print being so small, I can probably make two of these. Thanks guys!

I don't remember reading this or I might have missed it but what amp does it uses?

Amp?

Whatever you have/want to use, we did not specify anything, there is no way to tuck it into the enclosure.

~100 watts or so into 8 ohms is a good size, a little bigger won't hurt, but don't go too much smaller. Jack Hidley has some nice plate amps that are very affordable on his surplus sales website, though they will require a little modification to the onboard filters to perform their best with this enclosure and driver.

I use one of these (Emotiva model) to power my Tuba HT so I would imagine it would work well with this little guy as well.


http://www.parts-express.com/pe/show...number=300-812

OK, did I hear that right? The 12" Shiva version is finished? Who, where, when?!? And most importantly, how did I miss that?

If you couldn't tell, I have been waiting for the Shiva version...

Not quite done, but really close:

http://www.avsforum.com/avs-vb/showthread.php?t=1236960

http://www.hometheatershack.com/foru...ld-thread.html

It's about DIY FUN!

The Karma Indignia Theater consists of these modules:

Karma Indignia (mains)
Mindignia (surrounds)
Incentria (center)
Insubnia (subwoofer)

Anybody can build 'em from standard components, mixing and matching as desired:

Computer speakers? Mindignias and Insubnia.
Dorm room? Indignias, Insubnia optional.
On the road? Mindignia pair.
Kitchen or Bedroom? Indignia pair.
Office system? Indignias and Insubnia.
Bedroom HT? Add Incentria.
Apartment HT? The works w/2 Insubnias.

Very cool! Thanks!

There's an interesting review of the Danley patent in the current issue of Voice Coil.

Thanks for the tip. For those that may be interested, you can read it here (for a limited time) : http://www.audioamateurinc.com/digital/vc/issue/410/

Interesting.

It reads like the first thread about TDs tapped horns on all the other sites.

It states a cursory description then it list a bunch of prior art, and basically says good luck with patenting that.

TD seems to be raked over the coals everywhere.

I want to be able to build a DIY variant if I choose to, but I'll be darned if I want to see a Peavey or some upscale hi-fi brand knock-off for sale.

What - no Behringer ETH-5000 for you? I hear it makes 110 dB at 1 Watt, and is flat to DC....no - wait, that was something else entirely....

I wish Tom the best with the pursuit of his patent, and definitely appreciate the information he has shared with the DIY community.

Thankfully, patents do not preclude DIY efforts.

Not to throw a wrench in your thread but I'll be testing the Anarchy in a standard ported box today. Looking at what the woofer did in your design I would suggest that a 6th order ported alignment might be a better way to go.

I am going to try one in a 6th order alignment using 8" passive radiators instead of ports

No gears here for you to throw a wrench into. Design it, build it, test the results and show us all another way.

It is a great driver, I'm sure it will work in lots of different boxes.

I designed a tapped horn with it, you can do whatever you want with it. You like your cheerios, I like my wheaties. I'll bet neither one of us is a fan of kool-aid.

It's all good.

That sounds like an interesting project.


I'm glad I wasn't drinking any when I saw that line. My monitor would have gotten a bath

Call me stupid, but how to get you get a driver that is a mid-woofer (Ex-anarchy)to behave like a subwoofer?

This is a perfect sub to replace my crappy PC sub...... I wouldn't use it anywhere else....

The Anarchy is not a mid-woofer.
For a 6.5" driver it has impressive X-max and its has the XBL2 tech stuff. (no?)

Although as you can see its performance is limited.

My driver shipped yesterday, but I probably won't be able to start on this for a couple weeks, wife goes in for surgery next week.

Cool - I had the same idea. I've noodled a couple 6th-rder BP alignments for the W8-740c and W6-1139, and recently realized that using PR's would probably work well. I'd be interested to follow this - how you model it and how it pans out.

I don't know how people define such things but it was originally designed for a finished product as a 2-way midwoofer (crossed over to a 1" tweeter) and for use in a small compact 1 cubic foot vented bass cabinets (in pairs).

The fact that it works in a tapped horn is purely luck. I didn't design it for that application although it works great with the consequent limitation in bandwidth. It will also work well in a bandpass enclosure as Rick pointed out. None of those are by design but a consequence of the parameters.

What is unique about the Anarchy the way I see it is its balance of bandwidth (goes deep) in small enclosures and it is still extremely easy to use all the way up to a traditional 2K-2.5K crossover. It also has the stroke to give great output for its form-factor. It has all the attendant trade-offs with making that design choice (bandwidth & box size) so it isn't exactly a high-efficiency driver. It is more efficient than the Extremis was but that isn't saying much. It is pretty comparable to your mainstream SS Revalator and Usher products in that regard.... and of course it cost a fraction of a SS product.