Subwoofer connectivity question

Should I run leads from my amp to the sub, at the same time as running speaker cables from my amp to my speakers?

Yes. The input impedance of the speaker-level inputs of the sub will be very high. Therefore it will present a negligible load to the amp, and the wiring between the amp's output terminals and the sub doesn't have to be heavy gauge speaker wire; much narrower gauges will work fine for the sub connection too, as long as the main speakers are connected directly to the amp with heavy gauge cable.

REL subs, for example, come with a narrow gauge 3-wire cable which can be used for that purpose, one wire going to the left channel + output of the amp, one wire going to the right channel + output of the amp, and one wire going to the - output of either channel. (Connecting to the - output of the other channel isn't necessary, as the two - outputs of an amp that does not have balanced outputs are presumably connected together within the amp).

Regards,
-- Al

If you are going to run your speakers full range why bother with a sub?

I use a pair of Gallo TR1D subs, and run my bi-wired main speakers full range. The subs are connected speaker level with a short piece of speaker cable from the low frequency terminals of the speakers to the subwoofer inputs.

The subs are positioned next to the main speakers so this arrangement is tidy. The crossover and level controls are utilized on the subwoofer for a perfect blend.

The REL "high level" input system is brilliant as it stays out of the way of existing hookups, the amp likely doesn't know it's there (puts a very high impedance load on the amp) and lets your mains remain unmolested...I spade my REL at the amp and banana the main speakers so everything fits neatly, and the REL blends beautifully and sounds great.

Hi B Limo, your dac is fine with a low output impedance your Prima Luna is fine with a nice high input impedance.
To see if the sub will match ok I need to know what it is and if you have a link to the specs.

Cheers George