Sub connection to CARY SLP-05 preamp


I have a velodyne DD-12 that would like to add to the system with a CARY SLP-05 preamp to support my Thiel CS 3.7, can anyone tell me what is the best way to do it?
grandetech
Almarg,

Got reply from Vel. "The Line level input impedance is approx 15K on DD15". Is it good?

Richard
15K is too low to be ideal, given the impedance rise of the SLP-05's output to 3.4K at 20Hz. That is less than a 5x ratio. On the other hand, depending on the placement of the sub and speakers, the settings on the sub that you end up with, room acoustics, and certainly the source material, the effects of that will not be noticeable on a lot of material, and may not be bothersome on any material. Assuming, again, that the SLP-05's output is capacitively coupled, and that its rca and xlr outputs are independently buffered.

Also, the 15K value pretty much rules out the possibility of using a y-adapter on either of the SLP-05's outputs, because the combined parallel impedance of the sub and your main amp is only (15 x 25)/(15 + 25) = 9.4K

But I'd start with the power amp to speaker-level input approach first, which (assuming it works as we suspect) avoids all of those issues, and has the additional benefit of providing the same signal to both the sub and the main speakers. REL, in the literature on their subwoofers, makes a point of emphasizing the benefits that can provide in terms of overall coherency, since the sonic effects of the main power amplifier will be reflected in the signals to both the sub and the main speakers.

Good luck!

-- Al
Richard, sorry for the late response. All I can say is that there is no problem asking the SLP-05 to output both XLR and RCA at the same time. If you want an even better solution, you should consider an active crossover to remove bass frequencies from your main speaker.
No problem at all, Amfibius. I have put up a pair of speaker cable to the sub from amp tonight, it seems working quite good now. I found the xover at 53hz quite fit to my speaker, still tweaking.... just wondering what it means by tweaking those SLOPE things...., there are LOW PASS XOVER SLOPE, SUBSONIC FREQ, SUBSONIC SLOPE, PHASE, CONTOUR FREQ, CONTOUR LEVEL. Nothing from the manual....
BTW, thanks for the help from Almarg! Thumbs up!Music is so much involving now.....