Are characteristics of letters more apparent when the letter is saakin (not voweled)?

Assalaamu 'Alaikum wa Rahmatullahi wa Barakaatuhu

 I understand that the intrinsic characteristics are always present in the letter, but are there degrees to the presence of these? e.g. is the whisper more apparent when the letter is saakin than when it is vowelled? If so - would this be the case for all other characteristics?

Wassalaamu 'Alaikum wa Rahmatullaahi wa Barakaatuhu

Wa alaikum assalaam wa rahmatullahi wa barakatuh,

The intrinsic characteristics are always present, as indicated in the question, but the saakin letter gives more of a chance for the characteristics to show since there is no vowel.  In the case of letters that have and  the timing is longer with the saakin letter than other letters, which makes the sound of the characteristics clearer. 
The characteristics that are especially evident when saakin are: , , , , and , but other characteristics are also more evident when the letter is saakin, so this is not exclusive.

Wa assalaam alaikum wa rahmatullahi wa barakatuh