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Obi's IB


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51 replies to this topic

#1 of 52 OFFLINE   Robert George

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Posted April 03 2002 - 10:21 PM

Better late than never. I promised pics of my infinite baffle sub install and here they are...



Obi's IB



I'll also post a link in the "speakers and subwoofers" section where I will discuss any performance aspects of the install anyone is curious about.

#2 of 52 OFFLINE   Cam S

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Posted April 03 2002 - 10:31 PM

Wow, very nice work. I love how it looks with those nice SVS subs peaking out from the wall. What are the power ratings of the Sumo amp, that thing is massive!!! BTW, how does it sound???
MOOOOOO

#3 of 52 OFFLINE   Robert George

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Posted April 03 2002 - 10:59 PM

Yeah, I like the looks of the drivers myself. I thought about a grill to cover them, but I think I'll keep them "uncovered" for now. The Sumo is rated at 260 wpc into 8 ohms and over 400 wpc into 4 ohms (these are 4 ohm drivers). An IB is inherently more efficient than a traditional box sub, so I have power to spare here. How does it sound? Amazingly good. Very tight. Very quick. Seamless blend with the mains. Really, the best overall bass I have ever heard. Some subs go lower and some play louder, but none I have heard do everything as well as this design.

#4 of 52 OFFLINE   rodneyH

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Posted April 03 2002 - 11:46 PM

let me see If I understand the concept correctly, simply mount a sub or 2 or 4 or 8 in a wall, separating the front from the rear and "walla" you have a great sounding sub?? do you need to do any calculations for the area behind it?? etc... seems to me that if this is truely a great sounding sub, this IB idea sounds great (less floor space, increased WAF, decreased cost, increased efficiency and volume, am I missing any??)

#5 of 52 OFFLINE   Cam S

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Posted April 04 2002 - 12:11 AM

the IB design seems almost too good to be true, I mean you can't design it like you can a normal sub box with LSPcad and WinISD.
MOOOOOO

#6 of 52 OFFLINE   Mike Knapp

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Posted April 04 2002 - 03:19 AM

I just know your front soundstage improved dramatically with the removal of the tubes from the right side of the room. I cant wait to actually hear it.



This is one of those win-win DIY situations. If you have the room to do one (attic space, basement or closet), you will not find an easier (no cabinetry involved), better sounding bass arrangement. The icing is the WAF which is extremely high.



Congratulations on the completion of the install. I am jealous because I have not yet figured a way to do one in my room, even though I have been longing for one since I heard Rich Kraus' install last year.



Now....just one more suggestion Posted Image



If you paint the wall (yes the whole wall) behind the speakers black, that image on your TV will improve dramatically (no matter how good it already is)! I promise you it will be night and day different. The contrast will be perfect and when you watch a movie at night, all you see is screen. If you cant get away with black, pick a really dark accent color.



Remember when you were down here you were commenting on the great contrast I was getting in the Mits? It is the black surrounding wall that does it. If you decide to try this I will deny I suggested it when your Mrs. asks me! Posted Image



Mike

#7 of 52 OFFLINE   Pete Mazz

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Posted April 04 2002 - 04:36 AM

Looks good, Obi! Any problem with the location being so close to the RPTV? Pete

#8 of 52 OFFLINE   Rich Kraus

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Posted April 04 2002 - 05:33 AM

very sweet obi.



i wish i had a deep enough room to flush "the stuff" into the wall like you have done. maby when i find that big bag of money on the side of the road and buy another house. Posted Image



yup IMO, you cant beat these IB's on many fronts. Mike calls the SAF on these icing on the cake, but for me it makes bass like this even possible. My spouse wold have long ago veto'd a large box. I HAD to find another way. turns out the other way works pretty good. Posted Image
'Till next time,
Rich (the kite guy)

My DIY audio page!
Use your ashtray please, dont throw um on the street. thanks

#9 of 52 OFFLINE   ThomasW

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Posted April 04 2002 - 05:55 AM

Obi



Looks good Posted Image

I'll add your pics and a link to your site to the IB gallery



Enjoy Posted Image



Cam S.



If you want to model an IB, just use a box size that's 10 times larger than the total Vas of all the drivers

#10 of 52 OFFLINE   ColinM

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Posted April 04 2002 - 05:56 AM

My question is this - Often you have to move a sub around the room to find the best location...how do you approach this with an IB? Would you assume that the optimum position with a traditional sub would be the best for the IB as well? If I had to cut a hole in the wall or ceiling, this is the one issue that would keep me up at night. TIA - - C PS - Beautiful job and components!
You call that a knife?

#11 of 52 OFFLINE   ThomasW

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Posted April 04 2002 - 06:03 AM

Colin



Check the IB FAQ page linked from the "Cult" site

#12 of 52 OFFLINE   ColinM

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Posted April 04 2002 - 06:07 AM

TYVM!



Posted Image
You call that a knife?

#13 of 52 OFFLINE   Chad Isaacs

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Posted April 04 2002 - 06:56 AM

I need...er um..want one now.

#14 of 52 OFFLINE   Robert George

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Posted April 04 2002 - 08:39 AM

[quote]

Any problem with the location being so close to the RPTV?

[quote]


Pete:



Amazingly, no. In the planning stage, I was very concerned about magnetic interference and acoustic interaction (screen "flapping"). I was able to test for magnetic interference by placing the drivers in the same proximity to the TV as when they would be installed. When that tested okay, I proceeded with the project. I would not be able to tell about acoustic problems until the install was complete. Fortunately, the sealing of the partition between the drivers and the TV seems to have taken care of any potential problems in that regard.



Mike:



Fuggetaboudit. Posted Image

#15 of 52 OFFLINE   jeff lam

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Posted April 04 2002 - 09:48 AM

I thought an IB needed some type of enclosure. From the pics, it looks like it is mounted in the wall dividing two rooms. How is this different than just "Free Air"?

#16 of 52 OFFLINE   Rick Guynn

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Posted April 04 2002 - 10:08 AM

The difference is that 'free-air' has no partition and the front and back waves may intermingle and cancel each other out. An IB separates the front and back waves so there is no cancellation...

#17 of 52 OFFLINE   jeff lam

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Posted April 04 2002 - 10:19 AM

So an IB front has to be totally isolated from the IB back? Like a Bandpass design...just bigger?

#18 of 52 OFFLINE   Brian Bunge

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Posted April 04 2002 - 10:26 AM

Jeff, No, like a huge sealed enclosure.
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#19 of 52 OFFLINE   ThomasW

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Posted April 04 2002 - 10:27 AM

jeff Thankfully an IB is nothing like a bandpass. It's really a sealed box that just happens to be huge. Hence the name 'infinite baffle'

#20 of 52 OFFLINE   jeff lam

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Posted April 04 2002 - 11:54 AM

so do you have to worry about air leaks? I just don't understand how such a large enclosure can be effective. I guess I'll have to study up on IB designs. The design never really caught my interest till now.




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