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Sub wolfer advice

Hey guys I need some advise on a power sub. Here is my set up. Krell FPB 400CX & Krell KCT pre-amp with BMW speakers. I have never run a power sub before. I will be running my transparent cables from the amp to the power sub. Then another set of cables out of the sub into my BMW's. The sub will be 2ft away from my right speaker. Do I need to keep both lengths of speaker wire coming out of the sub into my BMW's the same length or can I run a short speaker lead from the sub to my BMW speaker that is sitting next to the sub or am I splitting hairs?

Next question should the speaker wirer coming out of my amp going into the powered sub need to be the same quality of wire going into the speakers?

Thanks guys for all your help in advance. Hope this makes sense. Any help you can give will be greatly appreciated.

Thanks
Chip
dancer

Showing 2 responses by davehrab

davehrab's avatar
davehrab
380 posts
 
Here’s a different approach you can try ... your Krell KCT has a number of premium low level MAIN outputs you can put to good use

You can run a XLR balanced cable from KCT MAIN OUT (#22 in the manual) to the INPUT of 400CX amp ... then run speaker wires from the 400CX to B&W’s ... this keeps the Sub out of Premium Krell/B&W loop

As your powered Sub most likely has a low level RCA IN ... run a normal single ended RCA (#22 in the manual) from KCT MAIN OUT to the SUB INPUT RCA input on powered SUB

Now the 400CX and B&W don’t see the Subs lower quality electronics and the 400CX isn’t trying to drive the B&W’s and the SUB at the same time

Each is running exclusively of each other ... but when you turn the volume up or down on the KCT Pre amp it will turn the volume up or down equally on both the SUB and 400CX amp

You can also use the special CAST Output (#23 in the manual) to drive the CAST Inputs on the 400CX also and still use the RCA MAIN OUT to drive the SUB’s input

CAST connection requires special Krell CAST Cabling ...

Possibly you can tell us what brand and model the Sub is and how you connect the KCT to the 400CX
davehrab's avatar
davehrab
380 posts
 
Right next to the XLR outs to the left is the RCA outs you can use to feed Sub ...

Unfortunately that Forcefield-4 Sub you are interested in only accepts speaker level ins and outs and has single channel LFE RCA IN

You are basically limited to using the speaker level connection ... so my suggestions for RCA/XLR hook up are mute

I guess you are back to your original query
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