Most of the speakers available in market today will go well with your receiver. Speakers selection is one of the most challenging task in building a good system and requires lots of information, auditions and time. A good quality speakers can last with you for many years and rearly need upgradation. Before selection of speakers some homework in this regards play a key role which ease your work.
1. Budget ...
The most important part is budget. There is no point in audition of speakers which you can't afford to own. Instead of that you can invest this time in your budget speakers.
2. Space...
Space is another important factor need to be consider because speakers eats lots of space. They need extra space to breath. Placement of speakers plays key role in overall performance of system. Instead of going for bigger speakers it's better to have speakers which can be easily accommodate in available space and can perform to optimum level. People do crave for floor standing speakers but bookshelf/subwoofer is also one of the great option to consider.
3. Usage....
Usage of system in stereo mode or multichannel mode decide the type of speakers. For HT use, a powerful or dual sub can give more dynamic and impactful movie experience. For Stereo, a good pair of floor standing speakers may be sufficient to have wider sound stage and strong image.
4. Sound signature...
Some speakers are warm some are bright and some are natural. Warm speaker with warm amplifier may sound dull or bright speakers with bright amplifier may cause ear fatigue. So synergy and careful matching of speaker and amplifier is important for overall sound signature of the system.
Following are some of the speakers may be suitable for Marantz SR 6012
1. KEF Q Series
2. Monitor audio Bronze series
3. Paradigm Monitor series
4. Elac F Series
5. Tannoy DC series
Dali,Polk, Mission, Boston Acoustics, Emotiva are some of the other options available in the market.
Exploring and auditioning more number of speakers will give you exact idea, what kind of sound signature suit you and selection become easy.