You can't use the RX675 as a preamp, but you could sure try it as a receiver. The amp in it, isn't that beefy, but it won't harm anything to try it with the .7s.
You won't get the full sound quality benefit with the .7s using the RX675, but it's a place to start. Might as well try it since you already own it.
You won't get the full sound quality benefit with the .7s using the RX675, but it's a place to start. Might as well try it since you already own it.