help with passive line level crossover PLLXO for 33K impedance amps

Daveis · 14th December 2008, 07:32 PM

I have a multichannel Rotel amp RMB-1075.

It claims to have 33K ohm input impedance.
My preamplifier has low 10 ohm output impedance.

Could a passive line level crossover for a 3-way speaker with crossover points of 800hz and 2200hz be created?

If so what would the values be? (How is this done with minimal loss, can you just arbitrarily choose small resistor values)

Can a single preamplifier (eg. Aragon 18K, 10ohm output impedance) drive multiple filters? Or is there too much loss?

Would using more preamplifiers, one for each channel work better?
(Either ahead of the filter or in place of buffers after the filter)

Could I temporarily use a preamp in place of a buffer like Nelson's B1/B2?

Line level source ---> preamp1
---> low pass filter ---> amp1
---> mid filter ---> amp2
---> high pass filter ---> amp3

or

Line level source ---> preamp1
---> low pass filter ---> buffer1 ---> amp1
---> mid filter ---> buffer2 ---> amp2
---> high pass filter ---> buffer3 ---> amp3

or

Line level source
---> preamp1 ---> lowpass filter ---> amp 1
---> preamp2 ---> mid filter ---> amp 2
---> preamp3 ---> high pass filter ---> amp3

Daveis · 14th December 2008, 08:12 PM

I've seen http://t-linespeakers.org/tech/filters/passiveHLxo.html

But I'm after a 3rd order or 4th order electrical crossover.
I'm trying to duplicate a LR24 crossover I'm currently doing digitally.

Is that a bad idea to even try PLLXO style?

It seems that in most cases you'd always want a buffer after the filter.

14th December 2008, 07:32 PM	#1
Daveis diyAudio Member Join Date: Dec 2003 Location: Des Moines, IA	help with passive line level crossover PLLXO for 33K impedance amps I have a multichannel Rotel amp RMB-1075. It claims to have 33K ohm input impedance. My preamplifier has low 10 ohm output impedance. Could a passive line level crossover for a 3-way speaker with crossover points of 800hz and 2200hz be created? If so what would the values be? (How is this done with minimal loss, can you just arbitrarily choose small resistor values) Can a single preamplifier (eg. Aragon 18K, 10ohm output impedance) drive multiple filters? Or is there too much loss? Would using more preamplifiers, one for each channel work better? (Either ahead of the filter or in place of buffers after the filter) Could I temporarily use a preamp in place of a buffer like Nelson's B1/B2? Line level source ---> preamp1 ---> low pass filter ---> amp1 ---> mid filter ---> amp2 ---> high pass filter ---> amp3 or Line level source ---> preamp1 ---> low pass filter ---> buffer1 ---> amp1 ---> mid filter ---> buffer2 ---> amp2 ---> high pass filter ---> buffer3 ---> amp3 or Line level source ---> preamp1 ---> lowpass filter ---> amp 1 ---> preamp2 ---> mid filter ---> amp 2 ---> preamp3 ---> high pass filter ---> amp3

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14th December 2008, 08:12 PM	#2
Daveis diyAudio Member Join Date: Dec 2003 Location: Des Moines, IA	I've seen http://t-linespeakers.org/tech/filters/passiveHLxo.html But I'm after a 3rd order or 4th order electrical crossover. I'm trying to duplicate a LR24 crossover I'm currently doing digitally. Is that a bad idea to even try PLLXO style? It seems that in most cases you'd always want a buffer after the filter.