OB H-Frame / A370PEQ / HX800 amp Box Flat Packs

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Captainhemo

Re: OB H-Frame Flat Packs
« Reply #240 on: 26 Jan 2017, 04:48 pm »
Now that I look more closely it looks like the outside verticals are rounded?

On the tineo pair pictured above, yes , the front  outside vertical edges are  rounedover.  Some guys want them this way, some don't,  this particular cutomer wanted  them rounded on the fron, not on the back to match his existing speakers.
If you go back  to page 5, post 86,  there is pair we sent to Ron at New Record Day  which  he finished  in hickory with no roundovers.

jay

jimbones

Re: OB H-Frame Flat Packs
« Reply #241 on: 1 Feb 2017, 03:20 pm »
I guess if the amp is flipped horizontally, cooling fins inside and controls close to the rear it might work on W frame.



Mireti, I may building something like yours, W Frame with Amp in drawer on Bottom. I cleared it with Danny and he thinks I will be fine. Vibration and heat are of no concern. Yay! Lol.

mirekti

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Re: OB H-Frame Flat Packs
« Reply #242 on: 1 Feb 2017, 03:40 pm »
Mireti, I may building something like yours, W Frame with Amp in drawer on Bottom. I cleared it with Danny and he thinks I will be fine. Vibration and heat are of no concern. Yay! Lol.

Thank you Jim, but I was a little bit impatient and ordered two RELs T-Zero on Sunday. They should be delivered today.
I will see if these two will work for me, if not I will get back to you.
Also, I am quite sure there could be others who would like the amp inside, but not so sure about the drawer. I mean, something could rattle. Wouldn't a fixed double/tripple sized and cut out bottom for the amp be a better solution?

jimbones

Re: OB H-Frame Flat Packs
« Reply #243 on: 1 Feb 2017, 04:10 pm »
I used the term "drawer" loosely (don't mind the pun) :) Of course I will have to build it like a Brick S House or such that there are no rattles. I don't think that will be too hard. You are right, it takes time. I happen to be in no rush. I am hoping to get this done by mid summer. That gives me a few  months. I have a local shop that will cut all the wood to spec so it will be delivered as a flat pack. I have a shop and can do it myself but I think it will go faster If I sub that out. I'll do the assembly. REL's are supposed to be good. I don't know how they compare to GR OB's. I was sold on the OB woofers.

bdp24

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Re: OB H-Frame Flat Packs
« Reply #244 on: 1 Feb 2017, 05:51 pm »
REL has a great reputation amongst advanced audiophiles, but they can't be considered in the same category as the OB/Dipole Sub. REL's, the Rythmik F12G, and other excellent sealed box subs are a completely different animal than the GR Research/Rythmik Open Baffle/Dipole Sub. Completely different in design, sound, and acoustic behavior, in the same way a Dipole speaker is completely different from a box speaker. Their dipole operation and figure-of-8 radiation pattern, where they need to be placed in the room, how they integrate with a loudspeaker, their maximum output capability, their lack of a resonant box, their characteristic sound--- "leaner", cleaner, etc. all different from any and all box subs, whether sealed or ported.

I liken the difference between box subs and the OB/Dipole as the difference between an acoustic/stand-up bass and an electric. The electric is rounder, fuller, fatter, the acoustic quicker, more snap and attack, less overhang and plumpness. The OB/Dipole is THE sub for ESL's, Magnetic-Planars, Ribbons, and other highly transparent loudspeakers.

Captainhemo

Re: OB H-Frame / A370PEQ / HX800 amp Box Flat Packs
« Reply #245 on: 16 Feb 2017, 11:26 pm »
that sloped set of uals  I posted pics of   a while back is  finally  nearing the finish line.

Here's a couple shots of   them after  a few coats of epoxy and some block sanding




Our painter is busy so they've been in the shop for  quite some time but great results.  Here's one in the booth


Another before final polishing


Picked one up this afternoon and popped the grill in place




Had to use some little knobs  so the grills  could be easilly removed


Some good light to show the finish


Bably blue amp boxes



Now to  box and ship    8)

jay
« Last Edit: 17 Feb 2017, 05:06 am by Captainhemo »

ebag4

Re: OB H-Frame / A370PEQ / HX800 amp Box Flat Packs
« Reply #246 on: 16 Feb 2017, 11:43 pm »
Very nice Jay!  What is the purpose of the epoxy on the raw MDF?  Is it used to seal the edges of the MDF?

Best,
Ed

mlundy57

Re: OB H-Frame / A370PEQ / HX800 amp Box Flat Packs
« Reply #247 on: 17 Feb 2017, 12:27 am »
Ed,

It does a very good job of both sealing the MDF so no seams will show through and it strenthens the MDF a lot.

Mike

Captainhemo

Re: OB H-Frame / A370PEQ / HX800 amp Box Flat Packs
« Reply #248 on: 17 Feb 2017, 05:12 am »
Ed,  just as Mike  said.  The epixy really  encapsulates the   MDF cabinet.
we rolled this stuff and then blocked it ,  in the futre, it will likely be sprayed  as our painter has been doing some of this.   

jay

Folsom

Re: OB H-Frame / A370PEQ / HX800 amp Box Flat Packs
« Reply #249 on: 17 Feb 2017, 05:45 am »
Looking good Captain.

Those amp boxes look like aluminum, at least on my cellphone. Cool idea.

Captainhemo

Re: OB H-Frame / A370PEQ / HX800 amp Box Flat Packs
« Reply #250 on: 4 Mar 2017, 01:35 am »
A coule more of the  Apple wood  subs. This is the pair that had some veneer issues   and we ended up keeping for  in home  demos.  They sat in Don's garage all winter, when we pulled them out, the lacquer had all cracked  :cry: 
Went to work on them ,   sanded them down with a block,  re lacquered with a flat lacquer this time and fitted them out with  drivers, no-rez, and  grills.






jay


jay

Jonathon Janusz

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Re: OB H-Frame / A370PEQ / HX800 amp Box Flat Packs
« Reply #251 on: 4 Mar 2017, 03:14 am »
For b-stock "demos", those apple wood look really nice!  That might be one of the first of these OB subs that I could easily mistake for being an ordinary boxed speaker with the grills on.  I like the grain on that veneer too, and I think that the satin finish adds to the "natural" look.  It should be really easy to blend those in with the rest of the furniture in a room.  :thumb:

bdp24

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Re: OB H-Frame / A370PEQ / HX800 amp Box Flat Packs
« Reply #252 on: 4 Mar 2017, 11:02 pm »
A coule more of the  Apple wood  subs. This is the pair that had some veneer issues   and we ended up keeping for  in home  demos.  They sat in Don's garage all winter, when we pulled them out, the lacquer had all cracked  :cry: 
Went to work on them ,   sanded them down with a block,  re lacquered with a flat lacquer this time and fitted them out with  drivers, no-rez, and  grills.






jay


jay

Fantastic Jay! With the inset grill, it really does look just like a bookshelf speaker from the 60's, such as the AR 3a.

Captainhemo

Re: OB H-Frame / A370PEQ / HX800 amp Box Flat Packs
« Reply #253 on: 4 Apr 2017, 02:05 am »
Ok,    some folks have been asking  about 6 stacks, a few  have asked about  singles (for running a single 12 on each side of a small room).....  so weve been working on a modular  design that can   work  out for basically any  number of woofer (singles, duals, triples, quads, or 6 stacks).  We saw something similar a year or so back when Rich built his  6 stacks. 

These are cut from  Medex,  1.25" side panels, 1" baffles, and .625"  top/bottom modle plates.  The  actual cabinet top/base will also be 1.25"  Medex.   Medex is a water/moisture resistant composite, it's classified as an MDF   but is slightly denser ,  approx 770 kg  m/3 vs 720 kg m/3 with standard MDF.  It is formaldahyde free  :green:

I've got a couple modules cut as prototypes.   We went kind of  crazy with the dowels, there will not be  as many  with production   pieces.  Final units will have  2 dowels  for each joint vs the 4 we drilled  ( I only used 2 per joint in the pics below)

Baffles are 1"  thick.  They are pre-drilled for  woofer screws, have wiring pass thorough holes in  each corner to eliminate going up and down with wiring, ( forward facing baffles will not have the pass through holes),  and a .5"  roundover on the rear side .





Top/bottom module panels  are .625"  thick.  They've got   4  8mm bolt holes (one in each corner) for bolting modules together  (these are skinned over so the plates can be reversed at the very top/very bottom of a stack, no hole will be visible  at the very top/very bottom. The necessary ones will be  drilled out for bolts before shipping. 
There are  wiring pass throughs on the rear side of the baffle.
These plates inset .75" from front and rear edge of  side panels so  grills can be inset (options yet to be determined).. There's a  .125  reveal cut onthe  front/rear edge  to correspond with  next module..



Side panels are  1.25"  thick.  Each will   have  .5" roundovers on outer vertical  edges,  a  .125"  rouindover (reveal) on inner vertical edges and outer horzontal edges  to correspond with next modules.. Two dowels  will match each  top/bottom plate and  also  baffle edges.





Here's a sinle module from the rear side with the  .125"   reveal/rouindover cut around the top. Next module has   the same cut on bottom. There will also be  two vertical dowels in each  side panel (both top and bottom) for  locating subsequent modules and a base and top   on  each stack.



A pair with a mock  base and top (some left overs I had  lying around).   Actual  base/top will have   .5" rounded corners and  .5" round overs on  top  of base , the top.bottom of cabinet top.
NOTE: If  you're thinking of veneering a set of these, we can disucss  eliminating the ro's



A better look at the  reveal between  modules



Bolt holes were positoned so that after no rez is installed,  they'll disappear



As mentioned, pricing is not finalized, hopefully soon. We've got to determine yeilds,  source some fastners and there a couple little details we need to  finalize as well.  Likely these will ship  2 modules per box, maybe 1  when it includes a  cabinet top and base.
So , for those who have asked, they are coming soon :thumb:

jay   (now to go through and fix all my   typos   :lol:)

HAL

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Re: OB H-Frame / A370PEQ / HX800 amp Box Flat Packs
« Reply #254 on: 4 Apr 2017, 02:28 am »
Jay,
Looking good.

Never put the NoRez in mine as they are still raw MDF.  Will be cool to see a pair of 6x12's with finish on them when the modules are done.

Rich

Captainhemo

Re: OB H-Frame / A370PEQ / HX800 amp Box Flat Packs
« Reply #255 on: 4 Apr 2017, 02:35 am »
Hopefully soon Rich   :hyper: