anyone here have graphs for a de-whizzered Visaton BG20?

[freddi]

just wondering how well it does and looks on and off axis without its whizzer?

 

[arjank]

just wondering how well it does and looks on and off axis without its whizzer?

I know the German magazine Klang&Ton has done this and used this version of the driver in several of their (two-way)designs.
It behaves better in the mids without whizzer but then it also has to be paired with a tweeter.

 

[freddi]

Thanks - do you remember if it makes it to ~8KHz on axis by itself?

 

[arjank]

Thanks - do you remember if it makes it to ~8KHz on axis by itself?

I'll check in my K&T archive

 

[freddi]

great - does your K&T archive include a Karlson-slotted T-line project?

 

[arjank]

great - does your K&T archive include a Karlson-slotted T-line project?

Never seen anything in the K&T magazine that resembles something like the Karlson enclosure. TL's though have been used a lot. Most of the time they use the bg20 in a somewhat larger ported cabinet.

 

[freddi]

IIRC there was once a diy project which had an internally slotted Karlson/Fulmer enclosure - K&T must not be "hip" without any real Karlson projects

 

[BHTX]

just wondering how well it does and looks on and off axis without its whizzer?

I'm interested in this as well. Of course, a pre-de-whizzered BG20 measured under the same conditions for comparison would be nice, too.. not to mention off-axis responses. But, I'll take whatever I can get.

 

[mjf]

In the german Visaton Forum there is a thread
BG20 - Höhen berauben ( means BG20 treble deprive)
with a de-whizzered driver.........

 

[freddi]

thank you very much - these graphs look respectable BG20 - Höhen berauben - Visaton Diskussionsforum

 

[arjank]

From the archives.

One picture shows the comparison, the other the modified version on-axis, 15, 30 and 45degrees off-axis

 

[freddi]

did this modified version have a phase plug? - I'll go back and read the translated thread

 

[mjf]

I think only that little paper cone was cut off.........so the BG20 driver looks like a normal bass-mid driver.

 

[arjank]

I think only that little paper cone was cut off.........so the BG20 driver looks like a normal bass-mid driver.

Think so too, the highend is not much affected by removing the whizzer.
Nice driver, will match nicely with a super-tweeter.