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***Working Man's DIY Dedicated Home Theater*** - Page 17

post #481 of 604
Thread Starter 
Got my crossover parts today! Woot!

I suck at crossover layout but this is the layout ima go with although ill consolidate it and make more purty..... smile.gif

F3C3EA95-CD10-40B6-830E-2C6C15A97D3C-4254-0000071B87294269_zpsada380fb.jpg
post #482 of 604
Quote:
Originally Posted by NicksHitachi View Post

Thats awesome man! The SEOS craze is pretty amazing, I havent ever heard them in person, but hopefully they live up to the hype. The tempests are prob my pick too in the off-the-shelf offerings at DIYSG too. I am building mine with Delta 12LFA woofers. There is a whole story on "why" but heres the basic short version.....
  • Found a good deal on 4 Delta 12 LFAs
  • Needed a sealed design to match up with my sealed subs
  • The woofer works very well in ~2.0ft^3 sealed with good extension, excursion control, and a F3 of 80Hz(THX spec).

I contacted Wayne over at Pi before ordering them and he said it had a favorable response and performance in that type application. He even uses it in one of His 3pi kits.

I contacted Bwaslo about working up a crossover for it, he did some nice work putting a crossover design together for it. I did upgrade the crossover components somewhat. I Used all the Audyn capacitors I could on the tweeter section, and upgraded from the standard NPE on the woofer to a Dayton Polyester. I couldn't bring myself to put a NPE in these babies!

These are the only ones being built with the LFA that I'm aware of.....

I have not made a decision on surrounds yet. IDK I might just have to deal with single monopoles. D. Erskine commented on a thread I posted and suggested an array of monopoles but IDK if I want to dive into that level of complexity. We shall see.
Never!
Oh Heck yeah! The details will prob be light here but I'm gonna get a full build thread going once I actually cut wood. I have a unique and slightly more difficult cabinet design planned. These def wont be "Monkey Coffins" but until I test the concept and prove my skills are up to the challenge, I'm gonna keep that a secret for now!

About damn time!!! Lazy bastard!! biggrin.gif

Your build is pretty close to my LCR build except I used 2512's vs the 12 LFA's. You will love them!!

Good luck!!
post #483 of 604
Thread Starter 
Quote:
Originally Posted by FOH View Post

Nick,

It's been quite some time since I've caught up on all your progress, ... wow .. congrats on all the hard work. Very entertaining, I'm glad I took the time. I think I'll stop by more often.

Best of luck

Please do!

Your one of the folks on here whose posts i find very informational, especially in the arena of acoustics.

Thanks,
Nicholas
post #484 of 604
Thread Starter 
@Java,

Flog away, I deserve it! smile.gif
post #485 of 604
Quote:
Originally Posted by NicksHitachi View Post

F3C3EA95-CD10-40B6-830E-2C6C15A97D3C-4254-0000071B87294269_zpsada380fb.jpg

I am glad to see a beer included with this photo. I know I'd have a bunch of bottles lined up by the start of the task ahead....smile.gif
post #486 of 604
Thread Starter 
post #487 of 604
Thread Starter 
Quote:
Originally Posted by TMcG View Post

Quote:
Originally Posted by NicksHitachi View Post

F3C3EA95-CD10-40B6-830E-2C6C15A97D3C-4254-0000071B87294269_zpsada380fb.jpg

I am glad to see a beer included with this photo. I know I'd have a bunch of bottles lined up by the start of the task ahead....smile.gif

Amen brotha. Ya know, I actually thought of getting one of these to make DIYing go faster.....

beer-hat-beer-helmet-pic-8.jpg
post #488 of 604
Thread Starter 
Theater progress next week i promise!

Im off most next week and ill be back stateside monday....

God Bless America but still love to vaca abroad!
post #489 of 604
Did you take that photo in SJ.?
post #490 of 604
Thread Starter 
Hi PF,

Yeah at the old fort.

Were back at Ft lauderdale, gonna spend a day here n fly back tom.

Cant wait to get back and revive my SEOS build!
post #491 of 604
You have a PM
post #492 of 604
Wow, just getting caught back up with your thread. You have been one very busy little bee! The speaker build is awesome, love the curved enclosure, very nice. I guess I should check in more often (someone has to crack the whip) to stay up with the program. Will be excited to see the speaker project completed and learn what your impressions are.

Regards,

RTROSE
post #493 of 604
Thread Starter 
Update:

The SEOS build is coming along nicely. I have finished assembly on one speaker and am currently starting the construction of the second and third cabs.

Here is a pic all assembled but no finish yet:





Here is the FR laid on back with 1/6 octave smoothing:



The midrange FR should flatten out a bit once placed into baffle wall as i intend.

Here is where I need advice:

I intend to mount baffle panels on the back of my screen wall. The baffle panels will be mounted to back of studs on wall and have 3.5" Roxul on face. The baffle panels will be 4'x4' which should be large enough to avoid baffle step down to 80-90Hz. However I did have a couple questions on the actual implementation of baffle wall.
  1. How thick does the baffle material need to be? 1/2" MDF 3/4 MDF?
  2. Where do I center the baffle panel? Centered to woofer I suspect?
  3. Are my calculations correct in achieving 2pi radiation to 80-90Hz?

The remainder of the wall will be filled with Roxul and function as broadband absorber.

Here's a pic of what I'm trying to do:

68600

screen wall.jpg 85k .jpg file
post #494 of 604
Sweet progress Nick! I've been quietly lurking (and learning) over in the SEOS threads and following along with your build questions. I really, really like the fact you have a curved back speaker similar to B&W's Nautilus line (and Revel, Paradigm, etc.). Did you come up with this cut plan or was that something I missed? Either way your woodworking is really great.

To be honest, I have never seen an instance where someone had baffle panels - only full baffle walls. Procella has a great pdf guide to building baffle walls on their website located here: http://www.procella.citymax.com/f/Procella_System_Design_&_Installation_v2.5_Web.pdf Baffle wall construction starts on page 19. Generally speaking the more mass on the front of the wall the better, so they recommend one layer of 3/4" MDF glued and screwed, plus two layers of 5/8" drywall with Green Glue dampening between the layers. Then on top of the drywall two layers of 1" Linacoustic (or similar) separated by a layer of 3 mil poly. The "cubbies" for the speakers should be constructed from either one or two layers of 3/4" MDF (with Green Glue if you go the second layer) and be as near-net shape to the speaker as possible. Fill any voids with insulation. To make the boxes removable at a later date, make the box deep enough so the front edges are flush with the double layer of 5/8" drywall and then cover the leading edge with the Linacoustic.

As to speaker height, Procella recommends the "acoustic center" to be at 5/8 up the height of the viewable screen (i.e. just slightly above center). Given the similar design between SEOS and Procella I would imagine your speakers would have a similar "acoustic center".

For the 2pi calculations....I have NFI but am anxious to learn what you find out!!! biggrin.gif

By the way, do you mind sharing your parts/material list along with the total cost per completed speaker? I know the SEOS things are like $35, but it is the compression driver and woofer selection that can really drive the cost skyward. Thanks and keep up the great work.


Oh....and I am very glad to see you still have the beers handy during production!!!
post #495 of 604
Thread Starter 
^Woah thanks Tim!

That link was incredibly helpful, I got a lot of ideas from that!
post #496 of 604
That is one beautiful naked speaker. Nicely done. What type of finish are you planning on?

Regards,

RTROSE
post #497 of 604
Quote:
Originally Posted by RTROSE View Post

That is one beautiful naked speaker. Nicely done. What type of finish are you planning on?

Regards,

RTROSE

RT,

Indeed a beautiful piece of craftsmanship - too bad he is thinking of covering it with - TruckBed Liner!!! I wish I was kidding :-)
post #498 of 604
Thread Starter 
Haha im not giving into PEER PRESSURE!!!

At least im going to thin it, and maybe spray it! Thats original......

I promise something sexy if/when i build surrounds as they will be seen......... wink.gif
post #499 of 604
Those speakers are seckzy! Great work.

I'd also be interested to know a ball park on what they set you back. The SEOS speakers are on my short list of speakers for the theater, but I really haven't spent much time researching it yet.
post #500 of 604
Quote:
Originally Posted by cuzed2 View Post

RT,

Indeed a beautiful piece of craftsmanship - too bad he is thinking of covering it with - TruckBed Liner!!! I wish I was kidding :-)

Hey that's sexy in a hilljack, redneck, hick kind of way. biggrin.gif

Regards,

RTROSE
post #501 of 604
Thread Starter 
OK, OK. I know Duratex is not the most sexy outfit...... Dont Hate!biggrin.gif

However, bear with me for a moment. I don't intend to do the typical high texture Duratex install. I intend to roll on the first coat and then lightly spray a highly thinned coat to achieve a finish much like my favorite example of sprayed Duratex From John over at Acoustic Elegance:



Without the wood insert however......

I have a subwoofer box I'm building for a friend which I can experiment on in case it turns out bad, no one will see that box......
post #502 of 604
Thread Starter 
AFA BOM:

Waveguide $28.00
CD $75.00
Woofer $99.00
Crossover $45.00
_____________________

Total $247.00ea.

Now I did get a steal on the woofers used. I bought them off another forum member for ~$50 each. I wanted a sealed alignment to make integration simple. If it were not for me finding such a deal on the LFAs I might have just went with the Deltalite Kit on DIY Sound. At $312.00 its a good deal and comes with the baffle already done. Its a sealed design also and uses a little higher quality woofer and a LOT lighter. I'm guessing my mains prob weigh 60-80lbs each with all the OCD bracing and that heavy ferrite woofer.

This effort is an all out assault on the ragged midbass and midrange that has plagued my theater. Hopefully in combination with the baffle wall and completion of treatments I can get that flat midrange I've been seeking.
post #503 of 604
Beautiful work!
post #504 of 604
For Hire?

wink.gif
post #505 of 604
Very nice looking speaker NicksHitachi - and thanks for that link TMcG, very useful info on that Pdf.. saving it for future reference wink.gif
post #506 of 604
Quote:
Originally Posted by dRwOOD73 View Post

Very nice looking speaker NicksHitachi - and thanks for that link TMcG, very useful info on that Pdf.. saving it for future reference wink.gif

I have that and other handy links in my build thread (link below).
post #507 of 604
Thread Starter 
Quote:
Originally Posted by tony123 View Post

Beautiful work!

Thanks Tony!

Quote:
Originally Posted by tbraden32 View Post

For Hire?

wink.gif

Sure! I work for beer..... biggrin.gif

Quote:
Originally Posted by dRwOOD73 View Post

Very nice looking speaker NicksHitachi - and thanks for that link TMcG, very useful info on that Pdf.. saving it for future reference wink.gif

Thanks bro.
post #508 of 604
Forgive the ignorant question, but are the SEOS speakers intended for baffle wall installation? From what little reading I've done, it seems like I remember seeing speakers must be designed for baffled installation.
post #509 of 604
Thread Starter 
Short answer, Yes.

Long answer:
I'm not sure about all of the designs but this design does not have any BSC in the crossover and needs a little baffle help to hit the target F3 of 80Hz. What you don't want to do is put speakers into a baffle wall that have BSC in the crossover, that will yield a 6db hump below the baffle step correction circuit frequency.

Why? Crossover designers typically attenuate the upper FR above baffle step to correct for the sensitivity loss of speakers below baffle step frequency. Below this frequency(dictated by baffle size/shape) the speaker radiates omni-directional and therefore loses sensitivity since some of that energy goes back, side, up and down instead of directly at the listener. Speakers installed in a baffle wall don't lose this sensitivity in because the baffle is so large that the speaker radiates 2pi through its entire passband. This minimizes unwanted reflections and also cleans up the midrange/midbass, theoretically. Additionally the SEOS designs are "controlled directivity" which means the acoustic energy is focused/contained to a relatively narrow angle minimizing unwanted side, ceiling, and floor reflections.

I'm pretty sure all the Eminence based versions are like this but IDK about all of the SEOS stuff.

If I have said anything here incorrect, somebody correct me gently tongue.gif
post #510 of 604
Thread Starter 
Need advice with NAS.....

I want to get a central NAS for my house. I Don't currently rip and/or stream anything over the network but might one day. I was thinking that a two bay NAS would suit my storage needs as all I'm doing currently would be music, photo, and critical file storage.

I was thinking this Synology DS212J



And a Pair of 1 or 1.5TB drives but IDK whats the best type of drives? Some "park" and some have better power efficiency and some have faster read/write idk which drive to use? Greens Blues, IDK blue is my fav color so maybe that one ?confused.gif

I was thinking Western Digital Caviar Green 1.5TB?


Any Ideas?
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