The onk, I believe, has 4 "s" and 3 "o" ins. The reason I gave you the
www.crutchfield.com site is because when you do a compare, you can get this info and even search by the criteria you want. Of course at that site the price will be high, unless a special or refurb, which is what you can find the Onk for if you shop around. The onk with 3/4 v/o ins can be found new for $229 or close to that. A great deal if you ask me.