Need help picking subwoofer cables interconnects

i just switched from some old monster cable sub ics to morrow audio for my dual velodynes and i,m very satisfied with them. good build quality and i think mike will make them to custom lengths for you.

Smart move. Don't waste your money. I have used blue jean cables on my velodyne dd18.

Try Blue Jeans for sub interconects- I used to use them. In fact I still have a set. Email me if you like. If you can go speaker level and use speaker cable, in my experience, this will outperform going line level with interconnects.

+2 for BJC cables. I use them for both of my subs with great success.

Is the equipment list in your system description up to date? If so, there is a larger issue that is present, which makes Foster_9's suggestion of using speaker level connections particularly appropriate.

Preamps that have two sets of outputs usually (although not always) have the two rca jacks for each channel simply wired together just inside the rear panel. This photo appears to confirm that is what is done in your particular preamp.

According to the S300 manual and according to this thread, both the sub inputs and the power amp inputs have input impedances of 10K (10,000 ohms). Therefore if you connect one set of preamp output jacks to the sub and the other to the power amp, the preamp's output stage will see a combined load impedance of 5K (two 10K's in parallel). That is too low to be optimal with respect to the preamp's nominal output impedance of 600 ohms, which probably rises significantly at low frequencies. The result will most likely be bass rolloff and other frequency response irregularities in BOTH the main speakers and the subs. It's not possible to say quantitatively how serious a problem that would be without having an output impedance vs. frequency curve for the preamp, but it figures to be significant.

The sub manual indicates that it is supplied with speaker-level to rca adapters, and the Audiocircle thread I linked to above indicates that the impedance of the adapter is 22K (I suspect that it is just a series resistor). That in combination with the 10K input impedance of the sub will present a completely negligible load to the power amp.

According to the manual the adapters can either be connected at the power amp output terminals, with an rca cable between adapter and sub (connected to the adapter via a female-to-female rca adapter), or at the sub input terminals, with speaker wire running to the amp. Since the amount of current that will be drawn by the 22K + 10K is insignificant, you wouldn't have to use typical heavy gauge speaker wire with that approach. Plain two-conductor 18 or 20 or even 22 gauge wire obtained at Home Depot would most likely do fine, IMO.

Regards,
-- Al