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Old 24th January 2012, 02:16 PM   #1
diyAudio Member
 
Join Date: Oct 2011
Default BIB placement

Hi, next week i'll start to buil a BIB with Monacor SPH-60X, i've found all the meauserement in the calculator.
I've 2 questions:

is this drawing correct????

2)What about the placement in the room???, i've a 4mx3m listening room and i was thinking to place them 1,10m from the rear wall and 55cm from the side wall.

I'm sorry for my bad english!!!

Have a good day!!
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Old 24th January 2012, 02:57 PM   #2
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I'm sorry but i'm not able to post the images, this is the link:

Whats new and exciting in speaker design? - Page 2 - Audioholics Home Theater Forums
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Old 24th January 2012, 04:28 PM   #3
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The drawing has the correct proportions.

In my limited experience, they need to go in the corners (not just near the corners). I think a meter from the rear wall is too far. But you can determine the right position after they are built.

If simulation interests you, check out the last article on this page, "Calculated Response of the Fostex FE-167E BIB Enclosure":

General Speaker Related Articles
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Old 24th January 2012, 07:14 PM   #4
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thanks, i'm going to read the document but unfortunately i cannot place the speakers at less than 1 meter from the bottom because there is a door, but i can move them 15cm from the side wall, i will try.....
must i put something in the cabinet or not??'
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Old 24th January 2012, 08:52 PM   #5
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Default monacor bib

With your placement issues I would either invert it for a bottom firing bib or choose another design. I don't think you'll be happy with the performance of bibs this far out into the room (from my own experience). Floor loading should give you much better results. Look in the big BIB thread for examples and how to calculate the new driver position (approximately .4 x line length if remember correctly).
Good luck!
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Old 25th January 2012, 03:18 PM   #6
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BIBs work best in corners. The closer the better. This maximizes bass performance. Mine are about two or three inches from the side and back wall. An argument can be made they take up less floor space than many other designs, even stand mounted bookshelf speakers. BIBs can be towed in for best sound.

Zilla
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Old 25th January 2012, 04:58 PM   #7
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I'm planning to do it back vented, as suggested here:
BIB calculator - amateur audio
but i've doubt about the speaker placement, it will result from: line leght*0,417 (285cm*0,417=118,8) so, considering the total eight in 145cm it will be in a bad position considering the eight of my ear even 118cm will be fom the bottom or from the top..
Tonight i'll try to post a drawing of the room and my project of the bib.....
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Old 25th January 2012, 08:26 PM   #8
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Quote:
Originally Posted by factory2nd View Post
I'm planning to do it back vented, as suggested here:
BIB calculator - amateur audio
but i've doubt about the speaker placement, it will result from: line leght*0,417 (285cm*0,417=118,8) so, considering the total eight in 145cm it will be in a bad position considering the eight of my ear even 118cm will be fom the bottom or from the top..
Tonight i'll try to post a drawing of the room and my project of the bib.....
I suggested the driver height of .414 for floor loading only. This would put the driver at 118cm (plus the height of any feet to lift the cabs from the floor). A bit high but I prefer this to lower placements. Again, I would not recommend ceiling loading with your placement requirements.
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Old 25th January 2012, 08:50 PM   #9
mlwalla is offline mlwalla  United States
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Join Date: Jan 2012
I just added a post with a similar question to the Epic BiB thread...

Similarly, I'm trying to decide on dimensions and placement options for my first audio project. I purchased drivers with a Fs of 70 and Qts of .55 and I've got weird room geometry. I think I can get them in the corners, but the wall angles in around 45 degrees at about 72" from the floor, and meets the ceiling proper another 2 feet or so above.

If I plug 50hz instead of 70hz into the BiB calculator, the cabinets come up to within a couple of inches of the 45" slant, but there is still another couple of feet to the ceiling proper. Any thoughts on whether this will project the sound out into the room and create effective corner loading, or am I S.O.L. with my room geometry, and better off venting to the rear or floor (unfortunately and unavoidably behind furniture)?

Alternatively, I could build the cabinets tuned at the factory specs of 70hz, which gives me 48" tall cabinets... those I suppose I could either mount on shelves, or again invert the design and vent to the floor.
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Old 25th January 2012, 11:38 PM   #10
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Hi, this is the drawing of the project i was thinking to built
ImageShack® - Online Photo and Video Hosting
please let me know if i've done something wrong!
Another question, can the port be divided half in the back panel and half in the side???
And another, will be a big problem if i'll change z driver from 118 to 108??
I'm going to draw the listening room......
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