You can do much better than Monster Cable. Blue Jeans Cable offers Belden 5000 which is highly regarded and inexpensive; about $1.00/ft. Also it's for in-wall use.
from the website..."UL-listed and NEC-rated for in-wall use."
http://www.bluejeanscable.com/store/speaker/index.htm
Also I have found their ICs to be very neutral sounding and a "great bang for the buck." The Blue Jeans LC-1 interconnect with RCAs only costs about $30 for 3 ft.
(And speaker cable-runs should be of equal length, even though yours is a short run.)
from the website..."UL-listed and NEC-rated for in-wall use."
http://www.bluejeanscable.com/store/speaker/index.htm
Also I have found their ICs to be very neutral sounding and a "great bang for the buck." The Blue Jeans LC-1 interconnect with RCAs only costs about $30 for 3 ft.
(And speaker cable-runs should be of equal length, even though yours is a short run.)