Thanks for all the help. I would like to take my speakers to the audio store ( as they previously adviced me) but they are too large and heavy ( MTX 10 ) . I did notice that the salesman gave me a catalog in wich the budget receiver has " all discrete amplifier stages" and the more upscale or professional marantz receivers have "all discrete CURRENT FEEDBACK amplifier stages".
There is certainly a difference here. Can someone explain what is the difference ? Does it mean that these budget receivers aren´t really "high current " ?
Responding to the return policy.... There is no return policy and the warranty is only one year
( I live in Costa Rica where this kind of equipment is expensive due to high tax ) . It applies to both ONKYO and MARANTZ products.