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Multi-Way Conventional loudspeakers with crossovers

Baffle step compensation.. how important is it?
Baffle step compensation.. how important is it?
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Old 10th March 2014, 02:35 AM   #11
stevebogus is offline stevebogus  United States
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Another way to deal with this is to select crossover points and driver locations on the enclosure to compensate. Allison did this back in the 1970s, if my memory is correct. These speakers were designed to be placed with their backs against the wall, or as close as practical. The tweeter and/or midrange would be located on the front of the cabinet in a conventional manner. The cabinet width and crossover frequency was chosen so that the mid/tweet drivers operated above the frequency where baffle step correction would be needed. The woofer(s), either side or top-firing, would be located as close as possible to the wall, neatly circumventing the baffle step issue.

The main drawback is the physical distance between the woofer and other drivers, which could introduce phase issues.
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Old 10th March 2014, 03:46 AM   #12
planet10 is offline planet10  Canada
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Baffle step compensation.. how important is it?
Quote:
Originally Posted by Einric View Post
One thing I've never been able to find is the effect of crossing over a 2-Way AT baffle step frequency.
On a 9" wide cabinet, which would be good for a 7" midwoofer, that would be 500Hz.
Now say we have a theoretical tweeter that could be crossed over at 500Hz LR2.
Assume the woofer and tweeter have the same rated sensitivity.

Do we even need to worry about BSC?
There are (mid)tweeters you can XO at 500 Hz. Althou usually you want to XO at less than the BS frequency (somewhere between 0.707 to 1 x F3(BS)). Woofer(s) should be 3 to 6 dB more sensitive than the midtweeter.

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Old 10th March 2014, 04:06 AM   #13
Einric is offline Einric  United States
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Baffle step compensation.. how important is it?
So a crossover at about 350hz for a 500hz baffle step with a 3-6db hotter woofer than the (mid)tweeter?

Last edited by Einric; 10th March 2014 at 04:08 AM.
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Old 10th March 2014, 06:02 AM   #14
planet10 is offline planet10  Canada
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Baffle step compensation.. how important is it?
Somewhere between 350and 500 Hz. Depends on driver responses. With a series XO you can adjust the amplitude response at the XO by juggling relative parts values.

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Old 11th March 2014, 04:14 AM   #15
davidsrsb is offline davidsrsb  Malaysia
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If you look at the Cambridge Aero 2 measurements in HFW Feb 2014, this is exactly what they have done. You can see that the bass driver is about 3dB more sensitive than the BMR mid/tweeter, crossed over around 300Hz. The reviewer noted that the bass was slightly excessive.
6dB BSC correction appears to be way too high in real rooms
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Old 11th March 2014, 05:02 AM   #16
planet10 is offline planet10  Canada
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Baffle step compensation.. how important is it?
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Originally Posted by davidsrsb View Post
6dB BSC correction appears to be way too high in real rooms
Unless a large room with speakers well free of the walls, yes.

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Old 11th March 2014, 09:39 AM   #17
davidsrsb is offline davidsrsb  Malaysia
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Too me the question is why was BSC not a problem for most commercial 2-ways with 2kHz+ crossovers and no attempt at BSC compensation.
BSC only became a popular issue when 2.5 ways became common
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Old 11th March 2014, 10:51 AM   #18
Bill poster is offline Bill poster  Thailand
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Quote:
Originally Posted by Einric View Post
So a crossover at about 350hz for a 500hz baffle step with a 3-6db hotter woofer than the (mid)tweeter?

pretty much what I'm doing with these.
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Old 11th March 2014, 11:05 AM   #19
Shaun is offline Shaun  South Africa
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Quote:
Originally Posted by davidsrsb View Post
Too me the question is why was BSC not a problem for most commercial 2-ways with 2kHz+ crossovers and no attempt at BSC compensation.
BSC only became a popular issue when 2.5 ways became common
It's not so much about popularity; more about knowledge. Baffle step always existed, but had not always been identified/described.

For instance, in my first loudspeaker design I compensated for a strange midrange hump by adding some equalisation. I only later discovered I had done BSC.
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Old 11th March 2014, 02:56 PM   #20
davidsrsb is offline davidsrsb  Malaysia
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Quote:
Originally Posted by Shaun View Post
It's not so much about popularity; more about knowledge. Baffle step always existed, but had not always been identified/described....
Though more serious with the narrow cabinets that became popular in the 90s
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