Alpair 12P

[LeifB60]

I am suprices of the good sound.

 

[LeifB60]

I think a good speaker need a notch filter.
Let see what we need.

 

[LeifB60]

Without filter ;


Alp12p3 - Forumbilder.se

 

[LeifB60]

With filter ;


Alp12p4 - Forumbilder.se

 

[LeifB60]

I think it will be much more bass now.

 

[vinylkid58]

I think a good speaker need a notch filter.
Let see what we need.

Could you post a sketch or drawing of the filter please.

jeff

 

[LeifB60]

My filter ;


alpair9999 - Forumbilder.se

 

[vinylkid58]

That image is very small. It's difficult to see the component values. No big deal, I was just curious.

jeff

 

[LeifB60]

Try to resize the pic.

 

[bepone]

LeifB60 pls give the pic of the filter which we can read...i will try it at home..,i have ALp 12 which is apsolutelly unlistenable..i have lost 7 years with this driver..

 

[LeifB60]

Filter setup

Filter serie; notch filter
0.68 uF
2.5 mH
6.8 ohm

Filter + -
60 ohm
33 nF
2.43 mH

 

[bepone]

grandj (cerveza)

 

[bepone]

driver alone is not for listening at all...
i'm playing with the filter, 2.5mH //20 ohms for the start..

2.5mH // 6.8R is too sharp still for me..

LeifB60 for what is the parallel notch filter (60+33nF+2.43mH) i have checked in simulator.. doing something around 20kHz?

 

[bepone]

driver is mounted in KEF LS50 -like cabinet.. cca 20 liter.
2.5mH 0.1ohm bobbin is made from thick wire and double C cores with air gap..
i'm thinking to make Fostex 3"- Alpair 12P combo, where Alp. would be only for bass.. Fostex 83 SOL regardless of size, sounds much better.. more normal, not so irritant like Alp 12p