Sub connection to CARY SLP-05 preamp

Almarg,

Just being notice of this!

My Sim audio Titan (5ch) power amp has an input impedance of 25K, according to what you said, is that causing my speaker rolling off the bass significantly? If yes, does it mean a high input impedance good quality amp will have a great improvement? Any suggestion?

Besides, do I need to biwire it back to from sub to poweramp according to some threads?

SLP-05 is running XLR to AMP.

Almarg,

Sorry I am a bit confused with the ohm thing.

You said
1. SLP-05 3.4k ohm at 20Hz, if sub input impedance < 30k ohm = bass possibly roll off. (10 times rule)

2. When Titan amp input impedance 25k < 30k ohm, you then compare to 25kohm to 3.4k directly saying its high enough (direct 1:1 compare?)

Did I miss anything? Or amp vs sub is different story when matching the impedance 10times rule?

I hope I made myself clear with these questions, otherwise, please feel free to ask me to elaborate again. Thanks very much for your help.

I will try your Sub connection method when I get back a pair of speaker cable loan to a friend.

So say if an amp with 100k input impedance, is it always better to produce the bass response than one with only 25k? Or it is just a matter of enough, excess is useless?

Or its better to ask in a broad manner, how is an amp with 100k better than one with only 25k, of course there are other factors for overall quality, but when speaking of input impedance level how it affects people's choice? Because at least you wont need to bother too much of insufficiency, other than that, whatelse?

Edorr,

Don't you agree what Almarg suggested about feeding a pair of speaker cables from Amp to Sub speaker level input? And also why he does not suggest to do what just say. Can you explain in case you think your way is better?

I would second what Almarg thinks in terms of how the velodyne works on both input. It comes in more handy for me to go for connecting the subs from Poweramp since I dont have the XLR splitter while RCA route also uncertain if a good to go. If there is no risk on trying, I will test Almarg way soon. Please confirm. I will also find out if DD-15 (actually its 15") EQ works on speaker input, which I suppose it would to make sense - I mean how would velodyne think people would like to use their sub as a full range speaker on earth....

Amfibius,

I am glad a Cary SLP-05 user shown up, driving the Sub with RCA means the SLP05 has to drive both the XLR and RCA simultaneously, will it cause uneven load on the output transformer and all the impedance issue as others suspecting above? Some advise to use Y-adapter for XLR, what do you think?

Richard

I just sent to Cary and Vel, thanks Al, will post it when I got answers.

Almarg,

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

Richard

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.....

Here you go Cary's reply.....Any thoughts?

Richard.



The best thing to do would be to run a pair of cables from the second pair on main outputs to you subwoofer. Do not use a Y-adapter to a mono sub input. The connections should be stereo (R/L) connections.



The outputs are capacitor coupled but the positive phase from the XLR is shared with the RCA positive signal. They are not isolated from each other. This type of subwoofer setup is done a lot with our equipment and unless there is a very low input impedance at the amplifier inputs, like 10K or below you shouldn’t have any issues doing this. The SLP-05 has plenty of gain to drive this.



Hope this helps!



Dan Wemmer

Technician

CARY AUDIO DESIGN