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Old 17th March 2009, 03:42 PM   #1
JC951t is offline JC951t  Taiwan
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Default Baffle step difraction

Hi guys,
Pls educate me. Does baffle step difraction affects
speakers of all sizes or will bigger speakers be less
affected ? Also with regards to zobel network if my
understanding is correct, it is implemented to compensate
for the rise in impedance of the speaker. If this is so, why
is it that the FR guys are'nt using it in their speakers ?

Thanks
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Old 17th March 2009, 03:55 PM   #2
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The effects of the baffle impacts all speakers until you get to an infinite baffle. The only thing that changes are the frequencies that are impacted.

As for zobel on full range designs, if there is no XO then there is little need for a zobel unless you are trying to change the impedance for less impact on the amp.

When you throw a XO into the mix, the rise in impedance, if not accounted for, will change way way in which the XO operates as you move higher in frequency. The zobel can be used to give a flatter impedance which can make it easier to get a XO to work propely, especially if you aren't using a XO optimizer. With modern software, the need for a zoble is lessened.

Regards,

Dennis
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Old 17th March 2009, 04:04 PM   #3
JC951t is offline JC951t  Taiwan
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Hi Dennis,
Thanks for the tutorial. How does one counter the
effects without resorting to a BSC circuit or having
go with a gigantic baffle

Thanks again
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Old 17th March 2009, 04:10 PM   #4
HK26147 is offline HK26147  United States
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Quote:
without resorting to a BSC circuit or having go with a gigantic baffle
By curving the baffle sufficiently.
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Old 17th March 2009, 05:26 PM   #5
badman is offline badman  United States
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Quote:
Originally posted by JC951t
Hi Dennis,
Thanks for the tutorial. How does one counter the
effects without resorting to a BSC circuit or having
go with a gigantic baffle

Thanks again

You can use a second woofer exclusively as baffle step compensation. "2.5 way" designs use this.

You can do a bipole speaker, which inherently compensates for bafflestep

You can hornload everything, which changes the nature of radiation. Big long midbass horns can push the transition down to bass range and out of the 'traditional' baffle step region.

Curves and bevels smooth the transition but it still takes place, just in a more controllable fashion.
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Old 17th March 2009, 05:46 PM   #6
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Baffle Step starter

http://t-linespeakers.org/tech/baffl...intro-bds.html

Sometimes a zobel can be useful on a FR, all depends on the amplifier used with.

Many of us use amps with high output impedance. They tend to put out more power is delivered as the impedance rises -- if you look at a typical FRs impedance curve you can see that this is at the very bottom & very top -- exactly where many FRs need help. Adding a zobel in this case would defeat the synergy of the amp/speaker combination.

dave
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Old 17th March 2009, 05:46 PM   #7
HK26147 is offline HK26147  United States
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Quote:
or having a gigantic baffle
Also if you have no baffle edge - as in drivers mounted directly into the wall. *
* Granted this is Not applicable/possible/feasible for most.
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Old 18th March 2009, 12:09 PM   #8
JC951t is offline JC951t  Taiwan
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Wow, thanks guys for the enlightment.
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