If you really want to improve the sound of your system, what you need to do is buy a felt-tip pen and draw some arrows on the cable pointing to the amp. Then disconect the cables turn them around so that the arrows are pointing in the right direction. The difference is like night and day. Seriously, if you can't hear it you shouldn't be in this business. Honestly.
Also I have some tea-bags that I've pre-used to extact the bitter tanins and increase by some tenfold the energy vibrations inherent in the Camellia Sinensis micro-pores and so now will produce the finest, smoothest most deliciousest tea on the planet. And because this is a limited-number offer ( five per day, max) I can let you have them for, er, £25.00 each. Deal?