There have been a number of threads here about the question of equal vs. unequal length speaker cables, with the expectable lack of consensus. My opinions on the subject are stated in my two posts in this thread.
In this specific case what I would be concerned about as being undesirable is utilizing a 28 foot speaker cable in conjunction with a speaker having a very low impedance in the mid and upper bass regions, regardless of whether it is on both channels or just one channel.
Also, my impression (not based on personal experience) is that vertically biamping B&W speakers with identical amplifiers can often be beneficial.
So my feeling is that if the cost is acceptable the best course of action is likely to be option 1.
Also, given John Atkinson’s measurement of "close to 600 ohms across the audioband" for the CP-800’s balanced output impedance, I would suggest that the XLR cables you would use under option 1 be chosen to have low capacitance per unit length. Meaning something like 20 pf per foot or less.
Good luck. Regards,
-- Al
In this specific case what I would be concerned about as being undesirable is utilizing a 28 foot speaker cable in conjunction with a speaker having a very low impedance in the mid and upper bass regions, regardless of whether it is on both channels or just one channel.
Also, my impression (not based on personal experience) is that vertically biamping B&W speakers with identical amplifiers can often be beneficial.
So my feeling is that if the cost is acceptable the best course of action is likely to be option 1.
Also, given John Atkinson’s measurement of "close to 600 ohms across the audioband" for the CP-800’s balanced output impedance, I would suggest that the XLR cables you would use under option 1 be chosen to have low capacitance per unit length. Meaning something like 20 pf per foot or less.
Good luck. Regards,
-- Al