Seas W18EX Active Lowpass

[paulhfx]

I'm looking for suggestions for an active crossover lowpass for the Seas W18EX - something that does a very effective job of killing upper resonance when crossover frequency is approx 1800Hz. A basic 4th order isn't doing it well (no surprise).

I thought I'd post this as someone has likely done this before with notch filters or higher order filters? What sounded best?

Thanks,

Paul

[Paul W]

Paul,
If you are using something like a DCX2496, try using one of the variable-Q bandpass filters as a notch filter. That works well for me...though with a 600Hz LR4. 1800 may be a stretch for the Excels.
Paul

[angel]

PaulW - what ribbons are those?

I'm guessing it's a dipole speaker, since the image is called "wings".

My GF actually liked their appearance a lot, which may be my only shot at getting to build a cool set of speakers in the near future

[paulhfx]

Originally posted by Paul W
Paul,
If you are using something like a DCX2496, try using one of the variable-Q bandpass filters as a notch filter. That works well for me...though with a 600Hz LR4. 1800 may be a stretch for the Excels.
Paul

No, I should have mentioned - this is a diy analog filter. 1800Hz may be a slight stretch, and I'll likely try lower, but I've got a dome tweeter to crossover/protect also.

Paul

[catapult]

When in doubt, consult the filter bible.....

http://www.linkwitzlab.com/filters.htm#7

[Jonasz]

Wich tweeter are you using?

Jonas

[Henckel]

Using the DCX 2496 and the SEAS Excell 18WEX001- i am doing:

48dB/oct at 2,2 Khz and two notch filters - 15dB, Q= 10 at 4,88 Kh and respectivly 4,98KHz

My experinces is that it needs at lot to kill the break up resonace when you go actice.

As a consequences of this experiences i am now looking for a "tweeter" that than can do 1,5-1,8 KHz as cross over

[Paul W]

angel...ribbon is DIY. here's a link...

WTW ribbon

[Jonasz]

I would recommend the RS28 wich easily can go down that low. I'm designing an MTM with them right now as a matter of fact. The RS28 is basically a bettered SS 9800 aludome and is not supposed to have any of the zing found in older alu-domes.

Here's a link to the RS28: http://www.partsexpress.com/pe/showd...number=275-130

Here you can find loads of info about it: http://www.htguide.com/forum/forumdisplay.php4?f=6

Here's a subjective comparison between
the RS28 and the Neo 3: http://www.pesupport.com/cgi-bin/config.pl?read=234053


Other possibilities is oc Seas Milennium (at a higher cost), the Seas 27TDFC, SS 95- 97- 9900.

Jonas

[paulhfx]

I'm using a Scan Speak 9700, and planning to use a 4th order (electrical) highpass with it.

Paul