Compatibility between speakers and sub.

Get a high pass crossover and use what ever sun you want. Matching is mostly about the crossover. I mean most speakers have totally different tweeters, mids and woofers…. The crossovers make them play nice. 

Does your integrated amplifier have R/L RCA sockets labeled Out or Output?

ATC offers the C1 which can be connected to their active speakers. ATC's Pro 12 Also connects to their speakers. They suggests using Dolby DARDT for best performance.

I bought SVS SB 3000 subs and I’m quite happy. I use the preamp out of my musical fidelity amp. Thanks everyone for your help.

REL are about as simple as it gets. Use the high level input (which draws the voltage directly from your amps output stage) and dial in cross over point and gain

Congratulations.

The SVS positioning suggestions appear generic. Their Sound Path Remote would make trial room positioning a breeze. This is a link explaining the subwoofer crawl. You don’t actually need to crawl unless you want to check it out for yourself.

https://www.youtube.com/watch?v=AV3oLLMgS-M

You should be able to find a low frequency test cadence on a test CD or a download. Draw a map of your room. While the cadence is playing through the speakers and sub note the loudest bass mode areas.

Decide on a convenient subwoofer location in or near a mode. Begin adjusting the frequency and Q to more closely match the presentation of your speakers lowest output using the cadence then actual music to your liking. These settings should be saved to memory in one of the application presets.

This may seem daunting at first, its not. There’s no rush, take your time and enjoy the flexibility of your subwoofers processing.