Visaton B200 - Taming the shout

Geoff H · 8th April 2007, 02:35 AM

Hi all. Joe has had a few issues with his B200s. None of the published solutions worked for him. He has given the attached line level passive network a try, and he has left the ribbons off.

No attempt has been made to correct the bass roll-off on his OBs, the bass helper does that. This circuit could be used on other baffle arrangements.

Over to you Joe, when you get away from Miss Jones.

Geoff.

Corloc · 8th April 2007, 03:09 AM

http://www.audiocircle.com/circles/i...?topic=31582.0

A very good thread for that, and the OB forum has lots of information on the B200

v-bro · 8th April 2007, 03:32 AM

I used this to tame the shout of my Monacor SPH-30X quite successfully:
http://www.audioasylum.com/forums/hu...es/120394.html

only I placed a potmeter on R3 to adjust the effect, it functions more or less like a midrange eq. fader...but once adjusted I never feel the need to change it again...

planet10 · 8th April 2007, 03:33 AM

Step 1 -- phase plugs...

dave

planet10/ of course i have a bias

v-bro · 8th April 2007, 03:42 AM

Here's what worked well on the Monacor:

v-bro · 8th April 2007, 03:44 AM

Hi Dave, thanks for your great input!

Geoff H · 8th April 2007, 03:51 AM

Hi Dave, one thing at a time. The ribbons are off. He must still be with Norah.

MisterTwister · 8th April 2007, 03:55 AM

it's a bit off topic, but how does one design a phase plug?
is there a software simulator for it, or is it just trying out all kinds of plugs shapes until response curve looks better?

johninCR · 8th April 2007, 03:58 AM

Though I reserve the term "shout" for whizzer coned drivers, the B200's do beam and have that long gradually rising response. Below is my solution to both. I call them Constant Directivity Dipole WaveGuides (CDDWG's). The narrower dispersion helps match the lower end response with the HF beaming to sound flatter overall. HornResp tells me there's even a few db gain from some slight horn loading below 1khz, which also helps out. When the waveguide runs out of steam, the dipole directivity takes over. I use them with dipole bass augmentation, but they work surprizingly well run full range with a little bass boost.

BTW, Dave I picked up a used pair of 167's that have your phase plugs. Will those fit a B200, since it has the same VC diameter?

Corloc · 8th April 2007, 04:05 AM

I like my phase plugs from Dave for the B200. The sure help the beaming. The rising response can be help with toeing in or out, a notch filter, or hopefully the new toy John is showing.

8th April 2007, 03:58 AM	#9
johninCR diyAudio Member Join Date: Apr 2004 Location: Costa Rica	Though I reserve the term "shout" for whizzer coned drivers, the B200's do beam and have that long gradually rising response. Below is my solution to both. I call them Constant Directivity Dipole WaveGuides (CDDWG's). The narrower dispersion helps match the lower end response with the HF beaming to sound flatter overall. HornResp tells me there's even a few db gain from some slight horn loading below 1khz, which also helps out. When the waveguide runs out of steam, the dipole directivity takes over. I use them with dipole bass augmentation, but they work surprizingly well run full range with a little bass boost. BTW, Dave I picked up a used pair of 167's that have your phase plugs. Will those fit a B200, since it has the same VC diameter? __________________ Everyone has a photographic memory. It's just that most are out of film.

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8th April 2007, 03:09 AM	#2
Corloc diyAudio Member Join Date: Jun 2004 Location: Michigan / Indiana border	http://www.audiocircle.com/circles/i...?topic=31582.0 A very good thread for that, and the OB forum has lots of information on the B200

8th April 2007, 03:44 AM	#6
v-bro diyAudio Member Join Date: May 2006	Hi Dave, thanks for your great input!

8th April 2007, 03:51 AM	#7
Geoff H diyAudio Member Join Date: Oct 2006	Hi Dave, one thing at a time. The ribbons are off. He must still be with Norah.

8th April 2007, 03:55 AM	#8
MisterTwister diyAudio Member Join Date: Feb 2006 Location: usa Blog Entries: 1	it's a bit off topic, but how does one design a phase plug? is there a software simulator for it, or is it just trying out all kinds of plugs shapes until response curve looks better?

8th April 2007, 04:05 AM	#10
Corloc diyAudio Member Join Date: Jun 2004 Location: Michigan / Indiana border	I like my phase plugs from Dave for the B200. The sure help the beaming. The rising response can be help with toeing in or out, a notch filter, or hopefully the new toy John is showing.

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