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i own the onkyo ht-230, hence ill give you my 2 cent abt onkyo's.
the speaker clarity is simply superb.. crisp and simply perfect. But the subs r a bit hollow.. Id suggest a jbl or infinity sub.. jamo and definitive r even better but that will cross ur budget buddy.. 8 inch woofer is a bit shy for me but then if ur room size is small, it should be just fine..
I read some comments above.. bro, u need to look at how ur speaker placement is gonna be for in a 5.1 setup, placement is very imp.. If u dont have it right, simply go with the 2.1 setup. I suggest you go check the bose 3*2*1. For me its the perfect 2.1 setup.. Im not saying buy that, i mean its a bit out of ur budget anyways but it sounds so bloody good, listen to it and after that when ur out to audition, get urself a system that sounds close to it.. My cousin has the 3.2.1 in his bedroom and it beats most small room 5.1 setups i know of...
so i suggest check ur speaker positioning first// if its not right, go 2.1// not heard A5's but fits good, y not///// Always get the best cause the shelf life of speakers is pretty long/////////////////////////////////////