Commentary on comparing power between rackets:

[ferrari_827]

I think it's unwise to draw quick conclusions about the power levels when comparing rackets just from demos. Reasons ?

The rackets are strung at different tensions from each other, have different strings, and varying amounts of string wear. For a more accurate test, the rackets would have to be strung at the same tension, using the same string, at the same time.

Just a 7lb drop in tension can mean the difference between a racket which has almost no power to one with decent power. I had one experience with the RDTi70 long (18x20) which felt it had no power at first (57lbs), but felt like at rifle at 48lbs.

[ollinger]

You have a knack for starting with false assumptions to generate absurd conclusions. NO, the racquets are not strung with different string -- my proshop strings all his demos with the same kind of string, as I suspect do many proshops. And yes, they are strung at different tensions because they are engineered to wear different tensions. Would you test a Corvette and a Civic with the same size tires?? So, if anything, one gets a MORE valid assessment with demos,, particularly if they are all from the same source.
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[@wright]

48 lbs is pretty low. With such a dense string pattern, I'd wonder what kind of control and feel you would get out of stringing that loose. Lately I have been wanting a little more power out of my PBP's, so I am trying to decide whether to drop the tension (I normally string at 58) or add some lead at 3 & 9. I think I'll try dropping the tension 2 or 3 lbs first.

[ferrari_827]

It depends on the tennis shop. Some tennis shops string the demos with different strings, at least from my experience.