DIY newby ? budget passive xover kit

[rotel_klipsch]

need a xover that has 12db slope and has 800hz xover point, looking for suggestions? please excuse my lack of experience on this ... but gotta start somewhere

TIA
Terry

[JonMarsh]

To do a passive crossover accurately, one needs an impedance curve and response curve of the drivers in the actual cabinet; then the target transfer functions (in your case 800Hz 12 db/octave crossover, which requires the drivers to be connected out of phase to sum correctly in the crossover region) can be designed.

A "text book" crossover designed for a 8 ohme resistive load will have significant errors, because speakers have inductive impeance rise due to the voice coils, as well as an impedance peak in the low end due to the cone/surround/enclosure compliance which would change the response of a passive filter, and has to be compensated, often with an LCR zobel.

Tell us more about your application and the drivers.

~Jon

[rotel_klipsch]

Hi Jon,
a little background on what I'm trying accomplish, do to a financial setback I found it necessary in the last year to down scale the HT/music center. I started with Klipsch reference sytem driven by Rotel separates and Kimber cable and interconnects. After moving into a smaller home I downscalled from a 7.2 to 5.2 and replaced the RF-7's & RF-5's with Ess PS-8h all around and then butchered the fronts up. I removed the tweeter and xovers and added a ESS electronic xover and the full size Great Heil AMT's which are mounted separately untop of the enclosures.
Problem is now I don't have the luxury of the separates and I don't want to use the original xovers as the smaller heils crossed @ 2k instead of the 800 Hz of the larger heils. I want to replace the 8" woofers with the Dayton Reference drivers.

Ess specs:


Performance Series PS 8H
Power Capacity 150 Watts RMS
Frequency Response 42Hz-23KHz + /-3db
Impedance 6 ohms
Crossover Frequency 2KHz
Efficiency: SPL@1w/1m 93dB
Low Frequency Driver 8" Polypropylene Cone
Cabinet Dimensions (HxWxDx) 32" x 10 1/2 x 13 1/2
Shipping Weight (each) 49 lbs.

AMT SERIES AMT GREAT Heil
Frequency Response 35-23+3dB
Crossover Frequency 800 Hz
Efficiency: SPL @1w/1m 91dB
Heil Air-Motion Total Radiating Area 21 1/2 sq.in.
Transformation Ratio 5.3:1
Magnet Assembly Weight 12lbs 5oz
Impedance 6 ohms
Dispersion 1200 Horizontal 300 Vertical

I looking to maximize stereo performance with the pieces I have and maintain a reasonable HT.