Subwoofer for classical music listener

RV, are the 25 foot cables connecting the preamp to the sub AND the sub to the power amps, or are they just being used for one of those two interconnections?  And if the latter, which one?  And how short would it be feasible for the cables to be for each of those two connections?

Best regards,
-- Al
 

I'm running 25' cables from preamp to sub and from sub to amp, four 25' cables in all.  I could probably get away with 15' cables. I understand from SVS that's the next size down, but I'd feel comfortable with a foot or more longer than 15.
I have Dalquist DQ 20 speakers.
In just about  all other parameters but brightness I'm very happy with the sound.  I dont want to fool anymore with settings. I suspect cables will improve things.

Btw, I mistakenly said I paid $100 for the four cables.  It was $100 for one pair: total $200.  Still pretty inexpensive.

Thanks to Stfoth for providing the data on the SoundPath RCAs. Their price is indicated at the SVS website as $89.98 for a stereo pair of 8 meter cables, and those are the only interconnects listed, so I assume those are what RV was provided with.

RV, given the lengths that are involved (even if you were to change to 16 feet), and given the somewhat highish output impedance of your preamp, and the unknown but very possibly highish output impedance of the sub’s high passed line-level outputs, it is particularly important for the cable to have low capacitance per unit length. The SoundPaths provide that, at 39 pf/meter. But of course a shorter length, such as 16 feet, would reduce the total capacitance correspondingly, and very possibly be beneficial in other ways.

I could probably get away with 15’ cables. I understand from SVS that’s the next size down, but I’d feel comfortable with a foot or more longer than 15.

The SVS website lists the SoundPath offerings only in metric lengths, including 5 meters, which is 16.4 feet.

Another possibility for a modestly price cable having very low capacitance (12.2 pf/foot), which can be ordered in any desired length, would be Blue Jeans LC-1.

Cable differences are generally system dependent and hard to predict, of course, but I wouldn’t be surprised if changing to a 5 meter length of the SoundPath cable, or a 16 foot length of the Blue Jeans cable, would provide a worthwhile benefit.

Best regards,
-- Al

Al:  Again, thank you for your detailed post!

I'm going to trade in the 8 meter cables for the 5 meter to see if that improves things.  
Also, I suspect an intermittently misbehaving preamplifier tube might be  the culprit since the anomaly varies from time to time.
I just ordered a new set of tubes, just in case.