Needed more headroom for my Arendal 1723 monitor s speakers. Tried Fosi ZA3 300 watts per channel using monoblocs and sound improved significantly. Decided to jump to 600 watts per channel and landed on your website. Now I’m where I need to be. I was concerned about ordering from USA but pleasantly surprised when my order arrived within 3 days! Shipping was even faster than ordering in US. Build quality is fantastic and sound keeps improving with break in. This is the last amp you will need if you’re looking for more power to drive speakers with lower sensitivity. All the nuances in the recording can now be heard at volume levels that are not ear splitting. Thanks for a great product and great buying experience..