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Old 19th May 2005, 07:53 PM   #1
grrr is offline grrr  Netherlands
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Default big open baffle idea

I want to make a big open baffle speaker 2 chanels in 1 big baffle close to a wall or as a room seperation.Is this a good idea and what do i have to watch for. I bought 2 chiare ch250 but they sound boomy in a small baffle (maybe it is my amplifier it has a 16 and a 8 ohm switch but not 4 ohm)

Remco
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Old 19th May 2005, 08:31 PM   #2
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As long as the baffle is out from the wall far enuff you should be fine... one big baffle thou makes it hard to play with toe-in.

dave
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Old 20th May 2005, 12:22 AM   #3
soongsc is offline soongsc  Taiwan
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These look like infinit baffle design
http://www.creativesound.ca/jordan.html
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Old 20th May 2005, 01:26 AM   #4
mor2bz is offline mor2bz  United States
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your driver resonates too much at the resonant frequency and all low frequencies for that matter. the qts is 1.3. bring it down by adding magnets to the back sold by ciare. one mag brings it down to 1, two down to .75. i recommend two. the efficiency goes up, and boominess goes down.
i can also recommend a sonic impact t amp or the vinnie rossi amp or the bolder cables amp; all use the same chip. this amp is cheap and loves 4 ohm loads. it will make about 8 watts. it has a high damping factor which is desirable with the open baffle as you do not have an air mass (as in ported speakers) or an air spring (as in sealed speakers) to control the motion of the driver.

don't give up on this driver.
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Old 20th May 2005, 01:28 AM   #5
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Quote:
Originally posted by mor2bz
your driver resonates too much at the resonant frequency and all low frequencies for that matter. the qts is 1.3.
The baffle itself can be used to tame the high Qt... Crver showed this well with hid OB where the Q ~3 bass drivers had no hint of their hiQ nature.

dave
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Old 20th May 2005, 02:23 AM   #6
mor2bz is offline mor2bz  United States
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planet 10, how is the baffle used to tame high qts? i understand the method of using a small baffle to avoid the f region of the driver's response, and then using a sub to add to the bottom, but what is the technique you to which you refer? the original poster already is using a small baffle.

thankyou for your attention.
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Old 20th May 2005, 02:25 AM   #7
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Quote:
Originally posted by mor2bz
ow is the baffle used to tame high qts?
You set the baffle up so that the natural OB baffle roll-off is countered by the rise in response of the high Q woofer. You do it just right you end up with total system Q in a desireable range (0.5-0.8)

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Old 20th May 2005, 05:52 AM   #8
dmason is offline dmason  United States
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Norbert accomplished this for the Ciare CH250 by calc'ing a baffle 1050X650cm with the driver 29/29cm offset.

This is the optimal configuration for this driver. I tried it and it works extremely well, as Planet10 suggests.
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Old 20th May 2005, 08:39 AM   #9
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I don't pretend to know much about OBs (though I intend to try them out), but wouldn't imaging suffer if you just used the one baffle to mount a stereo pair in? Or am I barking up the wrong tree entirely here? (I'm feeling more than usually stupid today.)

Whilst on the subject, can anyone point me in the direction of a decent OB design spreadsheet or software that they've used and can reccommend?
Best
Scott
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Old 20th May 2005, 12:41 PM   #10
grrr is offline grrr  Netherlands
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Hello and thanks for replying

Quote:
Originally posted by planet10
As long as the baffle is out from the wall far enuff you should be fine... one big baffle thou makes it hard to play with toe-in.

dave
How much space do they need? . I like to make them in front of a wall that is more like a frame with wood and windows in it between 2 rooms and i do not want to see thru it , maybe I can take the windows out .Yes it wil be hard to experiment with the position of the speakers

Quote:
Originally posted by mor2bz
your driver resonates too much at the resonant frequency and all low frequencies for that matter. the qts is 1.3. bring it down by adding magnets to the back sold by ciare. one mag brings it down to 1, two down to .75. i recommend two. the efficiency goes up, and boominess goes down.
i can also recommend a sonic impact t amp or the vinnie rossi amp or the bolder cables amp; all use the same chip. this amp is cheap and loves 4 ohm loads. it will make about 8 watts. it has a high damping factor which is desirable with the open baffle as you do not have an air mass (as in ported speakers) or an air spring (as in sealed speakers) to control the motion of the driver.

don't give up on this driver.
No i wont give up i like the sound a lot . I have an old el84 pp amp i like it a lot it looks good and it sound good and there is a riaa pre amp in it for my record player. does the 16/8 ohm afect the damping factor or only the power? the output impedance of the tube is also transfomed but the amp probebly has feedback.

How can you calculate the responce of a openbaffle . I downloaded a spreadsheat from http://www.melhuish.org/audio/software.html but it does not open. i use a mac and i used open office and it says that it is protected by a password . I know how to program a bit if someone knows the formulas i can maybe do so a aplet in java.

Remco
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