Cheap tweaks...What would YOU reccomend?

The "cheaper" the unit, the better the tweak "sounds". (Mine are cheap)
These are some of the tweaks that I recommend so far to my friends:
vibration damping: place bike's pneumatic bladders(I think this is the name), softly inflated, under the component, and books or other similar on the top of them. It looks horrible but: no "congestion", better dynamics, more integration.

Put ERS sheets (cryotweaks.com) over the power section of your components. Internally works better. Takes away lots of noise. It can take away dynamics if used on amp section.

Instal IEC receptor and try some power cords if your component has "captive" PC. Very effective.

I'm waiting for Bybee's purifiers to arrive. That is supposed to be the supreme tweak!

Tweaks can cool down your fever to upgrade.

The supreme tweak: Bybees purifiers!
I put one on each positive speake cable lead and totally
transformed de sound! read the reviews. They are absolutelly wright! It sounds like if the speakers became more sensitive and represented a smaller load to the amp. But more: integration of transducers as if the crossovers were upgraded; easyness to the sound; attacks are fast and decays are "real"; top to bottom coherence; detail, detail; it's easy to follow the musical lines...etc.

If you want to upgrade speakers you'll have to spend twice as much as you paid for yours to hear an improuvement. It's much cheaper to install Bybees! And you still can keep them when you finally upgrade.

I don't know if they can be called "tweak" o "cheap". They are expensive in absolute terms but when you hear the effect they produce you will soon forget the price paid (but if you know of a sale, call me). And they are said to be additive(and addictive) in effect.