i wish to build a coax system with the 12cx eminence .The tweeter is the cp380m from beyma.I measured up the frequency response of the system at 1m in a 125 liter enclosure.

My questions are :
where would you start to design the crossover?
which crossover point?
what to do with the rise at 10khz?

Thank you very much for your help!

frank

• http://de.f1.pg.photos.yahoo.com/bc/frankmalz/vwp?.dir=/Coax&.dnm=frequence+response.jpg&.src=ph&.view=t&.hires=t

• http://us.f1.yahoofs.com/users/a1457f87/bc/Coax/frequence+response.jpg?bcyokN_AIzc_cgmU

I'd look at 1.6 kHz for a starting point on the crossover, if you're doing a passive crossover then the 800 Hz resonance of the Beyma will need an impedance notch filter. I'd look at Wayne's crossover document for help with that.

http://www.pispeakers.com/Speaker_Crossover.doc
Jeff Robinson

• Frank's photos

I loaded the complete measurement files at my yahoo briefcase.
Open "coax".

frank

• http://de.f1.pg.briefcase.yahoo.com/frankmalz

I think you will probably want a Zobel on the Eminence midwoofer, but for the tweeter horn, a series/parallel L-Pad arrangement that attenuates 10dB would be great for double duty - attenuator and damper. Give that a go and check your measurements to see where you're at. If the L-pad doesn't damp the circuit enough, try some different values and maybe even go with Jeff's suggestion of a tank circuit (notch filter) which will act as a resonating damper.