Splitting Preamp Output--Affect Sound Quality?

The issue, in my opinion, has less to do with the Y-connector itself (as long as it's decent) than it does with the impedances of the amp and sub. With the Y-connector, their input impedances are paralleled and, if equal, the preamp sees half the load as with the amp alone. If the preamp can handle this (and most can), fine.

Another issue is the relative impedances of the two paralleled loads. If one is significantly less than the other, it will shunt signal current from the other. Again, this may or may not be a problem depending on the values and the preamp.

I, for one, use a preamp with multiple individually-driven outputs so such issues do not apply.

Thanks for the responses. I currently have an NAD C370 integrated amp with two preamp outputs. I was just wondering how I would handle my sub if I decided to upgrade to something like the Creek 5350SE.

Tony

I would check your IC (interconnect cable) very carefully, and specifically measure the IC capacitance, if possible. I recently checked a customer's homemade IC, 20 footer, and found the capacitance to be 15,500 pf; astronomically high.

Another consideration is the input impedance of the components. If the input Z of one, or both is low, and the preamp has capacitive output coupling, it may reduce the bass response.

Cheers,

Steve
SAS Audio Labs