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Old 11th February 2005, 09:35 PM   #1
johnb is offline johnb  Sweden
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Default Fullrange Without BCS

Is it possible to say that some kind of enclosures gets away without a filter, bipole exluded.
For what i know

ML TL needs it
BR needs it
BLH doesn´t need it
FLG doesn´t need it

How about
Voigt Pipes
TL
TQWP
OB


Feel free to fill in the missing and correct the assumsitions that i´ve made
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Old 12th February 2005, 02:19 AM   #2
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I'm not sure you can really clump them together like that. First off any speaker placed in open space is going to experience a gain in higher frequencies due to the higher frequencies only radiating into half-space. Back Loaded horns experience this as well it is just that most use horns that will reproduce high enough frequencies to compensate for the baffle step losses. Similarly I have heard that some of the Fostex BR enclosures are tuned so as to take care of the Baffle Step losses. So it all kind of depends upon the individual design. But certainly any speaker not built into a wall will have to deal with this problem one way or another.
Joe
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Old 12th February 2005, 08:09 AM   #3
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Hej JohnB,

In my case,I will use the Fostex F200A, built in a wall so that I will have close to infinite baffle. Nevertheless, I will anyway use filter (digital in my case) so that to adjust to the room response. Also, with such filter I can releave the driver from sub frequences, which might be an issue also for you, if you use a fullrange driver with smallish Xmax...

LageB
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Old 12th February 2005, 09:57 AM   #4
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You can often get enuff gain in the low end out of a back-loaded horn so that BSC is not required... Martin King's recently released Part 9 of his horn series is an interesting read wrt this.

dave
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