[Telstar]

I always support the idea of using the correct baffle width (e.g. comparatively narrow, such as the ones in the Orion or NaO). But I realised that in order to do that the design is a lot more complicated with at least 3 way to achieve that. For diyers a two way with a full range driver argmented with a woofer is far more attractive for its lower costs and simplicity. But that requires a wider baffle. I was exploring the idea to make wider baffle work with damping materials applied to the baffle, an idea coming from the findings of my U-frame studies.

Hi Bill,

I'm trying to understand if for bass support, lets say 30-100hz damping is needed and which help can provide.
Talking about pretty narrow (around 35cm) baffle width.

[gainphile2]

I just read this independent Linkwitz Orion measurement (SL won't give one) from here:

http://theaudiocritic.com/plog/index.php?op=ViewArticle&articleId=33&blogId=1

Clearly the peak is also still there at about 500Hz. Does anyone know the target f, q, and attenuation of Orion midrange xo ?

[sba]

Hi,  I'll be using the Eminence Beta-8A as a mid driver in my  3-way passive OB project.  A vintage JBL (LE25 / LE26) paper tweeter in a custom 5" waveguide will be above, and a vintage JBL 15" d130f will be below, boosted by Graham's warp drive T-Bass.

"Have heard the Beta 8 used in pairs for midrange up to 6K.  Worked very well, yes indeed."

"the Beta 8A started to roll off quickly starting @ 4Khz(from his FR curve) and he used the natural roll off(no cone break up) to x-over to the tweeter"

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So wait !....Should I run the Beta-8A full-range without any electrical filter?   Should it have a zobel ?
 
Thanks 

[HiFiNutNut]

Telstar,

Sorry for the late response. I have been busy and have not come to this site for a while.

At 35-100Hz no practical amount of damping materials can be effective. The material must be as thick as 1/4 wave length to be effective in damping (roughly, not quantified). So for 100Hz it is 0.85 metre, and 35Hz it is 3 metres.

Regards,
Bill