thanks "maSh"shown interest to my audio system.my room is 10'x18', with 4 windows with glass. speakers kept R -AMPLIFIRE- L within 2 meter of 10'side of the wall. listing!@12' now a days my source is only one,i.e.via mobile u tube only. with 3.5 jack alexa's pin (through wi fi ) via bluetooth. i have Marantz super cd/dvd but in transport most of classical cds damaged. and @200 casettets are laying, as philips player not getting service& spares.i have GRUNDIG T-5000/ TUNER. and another technic tuner also. but not utilising . i have been retired ,can you suggest ''pure-source''?which is easy . thanks sir.