aleph 1.7 and preout to sub

wuffer · 12th September 2004, 12:28 PM

i have just finished my aleph preamp and i would like to have a preout to a subwoofer... is there anyway to make that, so the sound dosent get worse??? my english is bad

Klaus · 15th September 2004, 07:19 PM

Hi,

I also did not want to load one unsymmetrical sub output onto the real symmetrical design of the P1.7.

I have chosen this way: one inverting OPA-buffer sums up the signal from both negative output (almost load free via 175kohms resistor) = not inverted signal. This mono signal is Linkwitz-filtered in two stages by 24dB/oct at 38Hz. This mono signal is given via one cable to my active dipole sub. It just took an extra PSU with +/- 17V and a small extra PCB...

One idea.

regards

Klaus

wuffer · 16th September 2004, 06:59 AM

thanks.. can you make a schematic of it?? that would be nice

Klaus · 20th September 2004, 07:32 AM

Quote:

Originally posted by wuffer
thanks.. can you make a schematic of it?? that would be nice

Sorry, I have no circuit file. I found the 24dB-filter on the Linkwitz page and the OP sum up circuit is somewhat standard. My scanner is defect, so I can not provide a circuit short term.

12th September 2004, 12:28 PM	#1
wuffer diyAudio Member Join Date: Feb 2004 Location: denmark	aleph 1.7 and preout to sub i have just finished my aleph preamp and i would like to have a preout to a subwoofer... is there anyway to make that, so the sound dosent get worse??? my english is bad

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15th September 2004, 07:19 PM	#2
Klaus diyAudio Member Join Date: May 2002 Location: near Frankfurt/Main	Hi, I also did not want to load one unsymmetrical sub output onto the real symmetrical design of the P1.7. I have chosen this way: one inverting OPA-buffer sums up the signal from both negative output (almost load free via 175kohms resistor) = not inverted signal. This mono signal is Linkwitz-filtered in two stages by 24dB/oct at 38Hz. This mono signal is given via one cable to my active dipole sub. It just took an extra PSU with +/- 17V and a small extra PCB... One idea. regards Klaus

16th September 2004, 06:59 AM	#3
wuffer diyAudio Member Join Date: Feb 2004 Location: denmark	thanks.. can you make a schematic of it?? that would be nice

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