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The Reference are a whole lot better than the Synergy.
The Reference aren't very good IMHO.
There are a bazillion speaker brands out there, and unless you are a biker, a frat boy, or would like to act like either, shop on. Energy, Mirage, Paradigm, Athena, ...etc would be a far better choice for most people. Listen before you buy. At Best Buy, for example, Klipsch is the 4th best speaker line in the store. But I must admit, Klipsch is a taste that I have never acquired. Strange midrange, poor imaging, and the Synergy line has no bottom end, and based on performance, pretty expensive for what you get. The Reference line is even more expensive, but if you put a gun to my head, I would rather have them of the two. Larger drivers in a larger box means more sensitivity and more bass (some bass?)
buy what sounds the best to your ears not anyone elses!
as a Klipsch reference series owner i have been very pleased with the Klipsch brand. I own a pair of RF-5 fronts, an RC-7 center (all cherry finish). and RS-7 surrounds and RB-75 back surrounds. I listened to quite a few other brands and these speakers just grabbed me. IMHO i think they sound impressive especially with adcom 200x3 amp driving the front 3 speakers. The speakers have a very dynamic and real sound to them. especially with guitars and pianos it sounds like the piano is in my living room. If your looking for speakers with wall shaking bass these arent for you. they do have accurate tight bass that is not boomy. I started with an onkyo tx-sr900 reciever and they sounded great but the volume level needed to be cranked to make them sound good. not so after buying the adcom amp. i can listen to them at a lower volume level and they sound good as well.
efficiency levels are great with a sensitivy of 99 db on the fronts and 98 on the center. the only weak point i would complain about is the way the grills attach to the speakers it can be easy to break the pegs off them. Klipsch are you listening??? Ok im done speaking about how i feel about klipsch. my recomendation would be to find a dealer (if possible) that handles the higher end speakers. make sure you bring music you are familiar with and also make sure to listen to them in stereo mode rather than multi-channel, if they sound good with only 2 speakers they will only sound better in surround. I auditioned the klipsch at Jamiesons stereo inToledo Ohio. the salesman let me bring my own music in and allowed me to stay for hours auditioning the different brands of speakers they sell.
REMEMBER NOT EVERYONE HEARS THE SAME, what sounds good to one person can sound bad to another.