I'm half done on my OB-5's!

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mono-tubeleosis

I'm half done on my OB-5's!
« on: 12 Dec 2006, 08:20 pm »
Well so far so good.  I have completed one OB-5 speaker and I wanted to tell you about my experiences so far.  First though let me explain why I didn't build both cabinets at the same time........ummmmm lack of confidence would best describe it I think.  I've been kicking around the idea on how I wanted to finish them and although I've made some cabinets before I've never felt like I finished them off with that factory look.  I guess you could say they all looked like DIY for one reason or another (AV-2's, AV center channel, AV-R's).

After getting information from Blaine, Al Wooley, Danny, etc. (Thanks to all by the way) I was pretty sure I was going to veneer them.  I probably could have taken everyones advice on the paperback veneer, dyes, irons, etc. and, I think I could have handled it but I still wimped out. Then I saw photos of what Al had done in the past using Black textured bed-liner and I really liked the look as well as the comments he made on them being easy to do.  But sometimes photos are misleading and I thought I would just do one first and see if I liked it.  Also if I didn't like it I would only have to re-do one speaker instead of two (choosing this method allowed me to quarter round some things I wouldn't have done If I was preparing them to be veneered).

I have to tell you I love the way this enclosure turned out for me and it was very easy.  I chose to build the cabinet(s) like Rocket-Ronney's and Daygloworange's speakers.  Well sort of.  I did leave off the top sides and back like theirs but unfortunately I'm not blessed with the skills or tools Dayglow has so no I don't have the rounded sides etc. or the beautiful black sides Ronney has.  What I did do was quarter round the front baffles vertically on the front not the back.  I also quartered the top of the front baffle on the backside as well as the top/back of the bottom of the cab that houses the woofers (I'll take photos and post them once I figure out how to do it).  I also rounded the back of the tweeter opening but not the backs of the mid openings.  Why you say, because I made a mistake.

Originally I made the front baffle one inch thick (two pieces of 1/2 mdf).  I built the cabinet and decided to add an extra 1/2 inch board to the backside of the front baffle.  This piece only goes down to where it meets the top of the bottom section.  I'm glad I did because it just looks more substantial.  Once I glued it down and sanded everything I realized I didn't quarter round the backside of the holes for the three drivers and it was too late to do the bottom midrange driver hole because there was not enough room to turn  my router around that hole.  It would have bumped into the top of the bottom section.  I did have room for the tweeter hole and I chose to leave the top midrange hole not quartered to match the other hole of the bottom midrange.  I could have also left the tweeter hole undone as well but I felt the less reflection out the back the better.  To me it looks planned anyway by only doing the tweeter since it is the only one of course.  It certainly would have looked odd IMO if I only did one of the mid holes just because I could get to it with the router.  At least this way it matches and I don't think not routering out the backsides of the mids will adversely effect the sound.  I hope not.

I spent MANY hours sanding and filling with Elmers wood putty.  I also took the advice from Danny/Al on the Elmers glue and water mixture to fill the joins on the mdf boards.  Using black primer over where the lines are glued you could see absolutely nothing.  I also used this glue over the rounded areas which get more pourous.  It worked to perfection.  I made extra sure I had the cabinet perfect before I rushed into finishing them.  I did run into one problem during in the build.  I felt some give between the front baffle and the bottom section and sure enough I could see it starting to pull away if you put pressure on it.  I guess the constant moving it around sanding it etc. developed a weak spot and I decided to put two screws through the front baffle for support.  I just countersunk them filled the two holes and it was seamless. 

Anyway I primed and texture coated the speaker on the same day.  The results were perfect. It really looked factory.  Even my wife was impressed.  She was worried it would look plastic but admitted it looked great.  Now I won't say it looks like a piece of art like Dayglows and Ronneys but no one would ever know you made them yourself.  Using the bed-liner spray was so easy I couldn't believe it.  I probably put on 6 or 7 light coats.  It looks matte on the finish but not flat.  It reflects light in different ways depending on the lighting.  I would recommend this method to anyone especially for the unbrave like myself.

Oh by the way I couldn't help myself from test driving the one speaker with one of my Paradox 3's. Yes I know that is stupid but I wanted to make sure it was working-----------That isn't the easiest crossover network I've ever made.  Well the sound coming out of the OB-5 was amazing for sure.  I can't wait now to build the other one and I'm certainly going into that one with a lot more confidence.

 
   

Rocket_Ronny

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Re: I'm half done on my OB-5's!
« Reply #1 on: 13 Dec 2006, 12:22 am »

Wait till you hear them.  :drool:

Rocket_Ronny

mono-tubeleosis

Re: I'm half done on my OB-5's!
« Reply #2 on: 13 Dec 2006, 03:01 am »

Wait till you hear them.  :drool:

Rocket_Ronny

can't wait!

Hank

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Re: I'm half done on my OB-5's!
« Reply #3 on: 13 Dec 2006, 04:49 am »
Mono-tube, don't fret over your woodworking skills.  There are a couple of professional cabinet makers/woodworkers here, and we can all learn from them, but YOU are doing the BIG thing.  YOU are rolling up your sleeves, making sawdust, inhaling a few vapors, and CREATING a piece of art.  An object that will deliver music to listeners like they have never heard before.  What a blessing is THAT?  And, your cabinets will bring compliments as people appreciate the look of the wood you chose.  99% of the world wouldn't even think of building speakers on their own.
Make sawdust...make music.

Daygloworange

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Re: I'm half done on my OB-5's!
« Reply #4 on: 13 Dec 2006, 05:05 am »
Quote
Now I won't say it looks like a piece of art like Dayglows and Ronneys but no one would ever know you made them yourself.

mono-tubeleosis,

Great craftsmen are made, not born IMHO. Everybody has to start somewhere. AudioCircle is a great place to help DIY'ers. If you have trouble, there's a lot of people here willing to give you advice.

You've chosen an ambitious project. Kudos, A lot of people would just go and buy a commercially available speaker instead. You'll have great pride in knowing you built yours, and great satisfaction knowing you got a much better bang for your buck in doing as you've done.

Hearing is believing. Rocket_Ronny and I have spoke at great length on our impressions of the OB 5. Let them run for a while and post your thoughts as well. You have the Paradox 3's, tell us what you hear compared to those. I know people who own those really are fond of them. Give us some feedback, and post some pics when your OB 5's are done.

Cheers :thumb:

mono-tubeleosis

Re: I'm half done on my OB-5's!
« Reply #5 on: 13 Dec 2006, 06:00 pm »
Thanks guys.  Yes it is fun doing this and does give you a great amount of satisfaction.  And yes I have made a fair amount of sawdust in the process.  Last night I made my final connections to the drivers and let it sing one more time before I continue on with the second cabinet.  I have so many changes going on at the same time it's impossible for me to know whats what right now.

I just got my Dodd battery Pre-amp a few weeks back and I only have about 40 hours on it.  During that time I also bought 2 sets of tubes (Amperex PQ white label U.S.A. 6922's / Telefunken E88 CCa's) so I'm rolling tubes at the same time I'm burning in the pre.  I have the Dodd 50 watt mono's on order and should be getting those soon.  I'm of course going to the OB5's over my P3's and so on.

As for the tubes right now I think I'm leaning toward the Amperex.  The Telefunkens are very good but the Amperex have wonderful mids.  The Telees though are bigger in the soundstage and are more dynamic from top to bottom The PQ's lack a little in the bass but the overall sound is very seductive.  Gonna be a tough call but I need to log in quite a bit more time with all of this stuff.  By about the time I get everything burned the Ob's will be done and I'll be burning those in.  I'm going to be busy for sure.

One last thing though.  Even though I had the OB on the left channel and a P3 on the right channel at the same time (Again I realize how stupid that is but I did want to make sure I still had everything hooked up right) I was able to get an idea on what I'm in for once the OB 5's are done.  I played about 15 tracks from various CDs I'm most familiar with and I was hearing some things coming out of the OB I never heard before.  It was singing like a bird.  The mids and highs sound so sweet and delicate yet fast as lightning.  Very hard to describe.  Very different from the P3.  The P3 seemed sluggish by comparison.  At times it even appeared that the P3 was disconnected and the OB was the only thing in the room.  I have a feeling once everything is done this will be the most dramatic single change I've ever made with my system.   

Daygloworange

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Re: I'm half done on my OB-5's!
« Reply #6 on: 13 Dec 2006, 06:08 pm »
Quote
One last thing though.  Even though I had the OB on the left channel and a P3 on the right channel at the same time (Again I realize how stupid that is but I did want to make sure I still had everything hooked up right) I was able to get an idea on what I'm in for once the OB 5's are done.  I played about 15 tracks from various CDs I'm most familiar with and I was hearing some things coming out of the OB I never heard before.  It was singing like a bird.  The mids and highs sound so sweet and delicate yet fast as lightning.  Very hard to describe.  Very different from the P3.  The P3 seemed sluggish by comparison.  At times it even appeared that the P3 was disconnected and the OB was the only thing in the room.  I have a feeling once everything is done this will be the most dramatic single change I've ever made with my system.

Let them run for a while, then post your impressions. I've made numerous discoveries while listening to my OB 5's. Very interesting ones. Ones that lead me to believe that the resolution of these speakers is beyond what a lot of engineers were using at the time of the recording. I'll chime in after you post. I'd like to see other people write of their impressions of the OB 5's as well.

Cheers

mono-tubeleosis

Re: I'm half done on my OB-5's!
« Reply #7 on: 14 Dec 2006, 04:02 pm »
Quote
One last thing though.  Even though I had the OB on the left channel and a P3 on the right channel at the same time (Again I realize how stupid that is but I did want to make sure I still had everything hooked up right) I was able to get an idea on what I'm in for once the OB 5's are done.  I played about 15 tracks from various CDs I'm most familiar with and I was hearing some things coming out of the OB I never heard before.  It was singing like a bird.  The mids and highs sound so sweet and delicate yet fast as lightning.  Very hard to describe.  Very different from the P3.  The P3 seemed sluggish by comparison.  At times it even appeared that the P3 was disconnected and the OB was the only thing in the room.  I have a feeling once everything is done this will be the most dramatic single change I've ever made with my system.

Let them run for a while, then post your impressions. I've made numerous discoveries while listening to my OB 5's. Very interesting ones. Ones that lead me to believe that the resolution of these speakers is beyond what a lot of engineers were using at the time of the recording. I'll chime in after you post. I'd like to see other people write of their impressions of the OB 5's as well.

Cheers

I know exactly what you're driving at.  You wouldn't be talking about mistakes by musicians and engineers now would ya.   aa

I heard a few last night................stay tuned!

Daygloworange

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Re: I'm half done on my OB-5's!
« Reply #8 on: 14 Dec 2006, 04:35 pm »
Quote
I know exactly what you're driving at.  You wouldn't be talking about mistakes by musicians and engineers now would ya.   

I heard a few last night................stay tuned!

Yup. That's exactly what I'm talking about. Things that are barely perceivable, but are there. I've come across some glaring oversights as well.

Cheers

Syrah

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Re: I'm half done on my OB-5's!
« Reply #9 on: 15 Dec 2006, 04:16 pm »
OB-5 Builders:

Have you ever considered putting cross braces connecting the top of the open baffle section to the back of the woofer section - just to give that long open baffle some added rigidity?  I was thinking maybe a maple 2*4.  I wouldn't think that would interfere too much with the breathing room.

Daygloworange:

Can I get in touch with you about maybe building me a pair?  My friend Jonathan has your e-mail address.

mono-tubeleosis

Re: I'm half done on my OB-5's!
« Reply #10 on: 15 Dec 2006, 04:29 pm »
OB-5 Builders:

Have you ever considered putting cross braces connecting the top of the open baffle section to the back of the woofer section - just to give that long open baffle some added rigidity?  I was thinking maybe a maple 2*4.  I wouldn't think that would interfere too much with the breathing room.

Daygloworange:

Can I get in touch with you about maybe building me a pair?  My friend Jonathan has your e-mail address.

I thought of it more as a design element than for support but when I was drawing it out it looked kind of weird design wise and I opted not to.  For support a few wood screws through the front baffle did the trick for me.  Just make sure you countersink them about a 1/8 of an inch, fill and sand real well.  It really shored things up for me.  I couldn't tell you if braces would effect the sound though.

Daygloworange

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Re: I'm half done on my OB-5's!
« Reply #11 on: 15 Dec 2006, 05:15 pm »
Quote
Daygloworange:

Can I get in touch with you about maybe building me a pair?  My friend Jonathan has your e-mail address.

Yeah, shoot me a PM. I will be building a few for others as well. Everybody wants something a little different though. Now's a good time. If I can do a batch order, I can give everybody a better break. I'll be doing them some time in January.

Cheers

mono-tubeleosis

Re: I'm half done on my OB-5's!
« Reply #12 on: 24 Dec 2006, 06:41 am »
I'll try and take better pictures during the day tomorrow but I thought I'd post these anyway.  I know they're not Dayglows or Ronny's but I'm happy how they've turned out so far.  I don't have all the screws in yet and the garage lighting is horrible but it gives a pretty good idea on how they look.  The flash makes them look like they have more shine than most lighting does, but the textured finish looks kind of cool to me.  The 2nd pic looks a little blotchy but the real thing looks very even.  Nice clean garage huh.  :lol:






klh

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Re: I'm half done on my OB-5's!
« Reply #13 on: 24 Dec 2006, 10:24 am »
I think you did a wonderful job. It looks beatiful. Don't sell yourself short!

Captain Humble

Re: I'm half done on my OB-5's!
« Reply #14 on: 24 Dec 2006, 04:07 pm »
I agree with klh.
They look great and I've never heard a speaker designed by Danny that I didn't like.
Merry Christmas!

Daygloworange

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Re: I'm half done on my OB-5's!
« Reply #15 on: 24 Dec 2006, 04:09 pm »
mono-tubeleosis,

Nice job. Glad to see you got them finished. Give us your impressions after you've had a chance to let them run for a while. Looks like Santa's been busy in the garage! :thumb:

Cheers

RAW

Re: I'm half done on my OB-5's!
« Reply #16 on: 24 Dec 2006, 04:29 pm »
 :thumb: :green:
Well done.
That paint looks like it turned out very well done :thumb:

Enjoy.

mono-tubeleosis

Re: I'm half done on my OB-5's!
« Reply #17 on: 24 Dec 2006, 05:18 pm »
Thanks Guys.  I'm getting the last screws in this morning and I have the MDF cut now for speaker two.  Should go easier since I know what to expect from this one.  Once I get that one done and into the living room I'll post pictures of my OB-5's in their natural environment.  :thumb:

This place is so helpful with people like you guys to guide me along.  AudioCircle sure is a wonderful place for us hackers to learn from.  I sure do appreciate all of your help. 

Happy Holidays to all.

Larry

Daygloworange

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Re: I'm half done on my OB-5's!
« Reply #18 on: 24 Dec 2006, 05:40 pm »
mono-tubeleosis,

I've learned tons about the electronics end of audio here on AC, so it's a pleasure to contribute back what I can. Met some really cool people as well, and made some new friend through this hobby here at AC.

Ya, make sure to post pics when you've got 'em all up and running, and write up a review. Enjoy your new speakers.

Cheers

mono-tubeleosis

Re: I'm half done on my OB-5's!
« Reply #19 on: 24 Dec 2006, 06:00 pm »
mono-tubeleosis,

I've learned tons about the electronics end of audio here on AC, so it's a pleasure to contribute back what I can. Met some really cool people as well, and made some new friend through this hobby here at AC.

Ya, make sure to post pics when you've got 'em all up and running, and write up a review. Enjoy your new speakers.

Cheers

Will do.  I'm getting antsy just anticipating what I know I'm going to be hearing.  I'll give em a good burn first before I let everyone know my thoughts, but just from the small sampling I've heard I have a feeling it will be awfully good.  Can't wait!