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RE: Need help deciding on new Klipsch (RF-35 vs RP-280R)

There is not going to be a lot of difference between these two loudspeakers so I don't see replacement as a very good option so far as benefit for cost goes. You can experiment with lowering the tuning frequency of your RF35 at a cost of next to nothing. You should be able to lower the tuning of your RF35 to match that of the RP280F simply by installing some longer vent tubes. All you need is some light poster board tape and scissors. You don't need any special equipment to do this or to test your results.
Measure the length of your existing RF35 reflex vent. Make a paper rube which is twice as long as the stock vent roll it up and fit it so it snugly fits inside your existing vent. Do this by back rolling the tube and then secure the tube with tape once you have a good fit and the the roll wont unravel. Some tape will allow you to easily work with the roll of cardboard while you experiment with various lengths. You can mark the tube with inch gradients. You can make a testtone disk by downloading some test tones off line or use a test commercial disk. I would suggest that you choose a test tone of 33Hz as your target system frequency, this will probably result in a slightly lower response than the RP280 which has a minus 3db point of 32Hz. While playing a test tone of 33 Hz adjust the length of your vent tube from stock to stock plus and observe the woofer motion. When the length of the tube is correct for 33Hz then the motion of the woofer will stop and all of the motion will be in the air within the vent. You don't need to worry about being exact you are looking for the length of vent which results in stopping or minimizing cone motion when you play the 33Hz test tone. It is that simple. This is a lot less expensive than buying new speakers to achieve the same result.
moray james



Edits: 02/11/17

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