I'm with Bigby on this one - TREAT YOUR ROOM! Build very thick DIY Fiberglass filled bass traps with a generous air space (e.g. 6"-8") behind them. I'm sure your $350 will go along way of buying some lumber and OC701 fiberglass or equivalent and some cloth to cover them.
Room treatments will put to shame (I'm exagerating on purpose to make a point) any kind of 'tweaks' associated with cables or amps or tubes etc in proving you with sonic dividends that far exceed your $350 investment. You will notive that the more elaborate systems here on A'gon usually have acoustically treated rooms. Coincidence? I doubt it!
Room treatments will put to shame (I'm exagerating on purpose to make a point) any kind of 'tweaks' associated with cables or amps or tubes etc in proving you with sonic dividends that far exceed your $350 investment. You will notive that the more elaborate systems here on A'gon usually have acoustically treated rooms. Coincidence? I doubt it!