To improve your system immediately start with power cords. I’ve tried many brands, The most significant and noticeable was Verastarr Grand Illusion. I first changed the power cable on my Oppo Blu-ray player. It improved the bass performance and sound stage. It started my journey to change , power cables, interconnects and speaker cable all to Verastarr. They improve the performance on even moderately priced components. I loaned my friend a Verastarr Grand Illusion Power Cable for his Sony receiver he was amazed at the upgrade in sound. As previously stated you should contact Mike Powell from Verastarr
