The price of the bond with the small coupon will be impacted more by a change in interest rates than the price of the large coupon bond. For a small coupon bond, the cash flows are weighted much more toward the maturity date because of the small interest payments.  The large coupon bond has high interest payments, many occur soon. These higher cash flows made earlier dampen the impact of interest rate changes because those changes in the discount rate impact the earlier cash flows to a lesser degree than the later cash flows.