I have owned spectral for since the mid 90’s. I don’t know much about your quad but if they are anything like Maggie’s you need at least 250 wpc to Get the panels moving.
Spectral had or has a universal amplifier that can be driven by any solid state device, so you can use a dac or any other preamp. The resolution is going to be limited by a tube preamp so I don’t suggest this.
as to spectral. I love their products but they are down to perhaps 3 dealers. I sold my products through sky fi and at 20 years all passed. I have seen threads concerning waning repair and customer support. That is why I chose a different brand when revamping my two channel
Spectral had or has a universal amplifier that can be driven by any solid state device, so you can use a dac or any other preamp. The resolution is going to be limited by a tube preamp so I don’t suggest this.
as to spectral. I love their products but they are down to perhaps 3 dealers. I sold my products through sky fi and at 20 years all passed. I have seen threads concerning waning repair and customer support. That is why I chose a different brand when revamping my two channel