What commerical audio system tweaks provide sound quality improvement??

Thank you to all who have responded. You have provided a wealth of good advice about audio tweaks.  I often wondered how important speaker connectors are. Fortunately, the connectors of the several speaker cables I have owned, seemed more than adequate, but.....

The Harmonic Technology Pro11+  I purchased used on AG came with expandable banana plugs. Most work, but some seem difficult to use. easily However, with garden hose thick speaker cable and these types of banana plugs, there is always the risk of breaking the speaker connector, especially if the speaker connectors are made of plastic and  because the torgue of  the cable because of its thickness. It is worse if the cables are longer than you need, which is a problem I have with the HT cable. It is a 12 ft pair.  But the sound they provide is excellent  The speakers are the Golden Ear Technology 7's, a very good speaker, but the speaker connectors are cheaply made. 

The speakers came with a ceramic oval base with standard spikes. Occasionally, there is a bit of overhang in the low bass  which could be related to several factors. I have considered using a one inch "dense" wood platform of equal size to further decouple the speaker from the floor which is carpeted.  A couple of months ago, I called up The Cable Company, and they advised against added elevation of the speaker to insure the correct ear to eye line from the tweeter to the listener's position. I am very familiar with this standard rule of  thumb caveat, and saw nothing in the manual advising against a minimal elevation;  unfortunately, I have never felt confident with The CC's recommendations or advice. At times, they can be unfriendly and dismissive

BTW, do "Audio Additives" RCA  caps for unused sources reduced the noise floor as claimed. Music Direct sells them, and they are reasonably priced.    Thanks, SJ   

OK. let's make sure, based on the last 10 responses or so, that nobody fries themselves by becoming a human electrical conduit. 

Audiogon does not have an official " In Memoriam"  category

S.J.    

Thanks to all who have responded since I advocated for safety.

To toddverrone, Good point, that is what I thought that a few inches in height would not make that much difference. I could even try those 2"x 2" squares that have a cork center and hard rubber top and bottom which have rails running across them. I used them before on components and they seem to make some difference, especially with my CD player. I bought them on line from an industrial parts company that offered them in different sizes. They were inexpensive, like $1.50-$2.00 per square depending on size.  Unfortunately, I lost the company's web address when my computer crashed about 1 year ago.  Vendors like Elusive Discs sells them but they are about six bucks per item.

When I upgraded to separates recently, I used what I had for the pre-amp, instead of the CD which sounds a bit different without them  The player is an Ayre CX-7e mp and is fairly heavy at 35 lbs. Nevertheless, it still needs some vibration control under it.  I will have to check out the Stillpoints items (recommended by member, "Zorro")  but I know they are expensive.  Nordost's new "Kort"  metal vibration pucks are too expensive.   Audio Prism  makes  some vibration control items that  look good and are not too expensive.  Music Direct offers them.

Tweakdom is a very crowned field and results can be spotty     Thanks, SJ