but there is no winter in the place i live =[
The 15.32 uses two wolfen dacs one for each channel while having the option of Digital Filters thru the switches on the front of the unit, While the 11.32 uses one Ess Sabre Dac and do not have the use of the Digital filters. Other then that they are similar but suppose to sound different then each other but I do not have the 11.32 as I went for the 15.32 instead.
From my understanding, the ESS9018, for the most part is considered to be a higher end chip than the wolfsons. Many top end DACs such as the Burson Conductor uses the ESS9018. However, it ultimately goes down to your taste in signature. The Wolfsons are indeed warmer sounding while the Sabre chip is a lot more neutral and detailed. Depending on which headphones you plan to use, you may prefer one dac over the other. The Sabre chips will work better with warmer headphones such as the HD650 and HD600 and help remove the so called "veil", while the Wolfson chips will add more warmth to leaner sounding headphones such as the Q701 and maybe the DT880s.
From what I have read it seems the ES9018K2M is a lower grade of chip than the ES9018.
I have seen it advertised for $20 each!