Hi guys, have a question, I am using PrimaLuna Integrated Tube Amp where it comes with 4Ohm and 8Ohm output. I am paring the Amp with my ProAc Tablette 10 Signature Speakers which published to have 10 ohm nominal impedance. I have tried both output and 4 ohm seems to gives better high end output but lack on bass. and 8ohm is more for overall. My question is which output should I choose 4ohm or 8ohm and is it safe connecting for 4ohm? thanks.