tweaks that impress the unsuspecting

None - the most impressive thing in recent years was Planet Earth on HD 1080p. This bowled over unsuspecting others. No minor audio tweak has ever impressed unsuspecting others. Our unsuspecting dogs go ballistic on test CD's with just talking - they think an intruder is in the house - TV or radio never does this.

Amen..

One of the best tweeks bar none was the addition of an Auralex "SubDude" isolation platform for my sub. Best $50 ever spent on audio. Unbelieveable, kills any unwanted vibrations and resonances that muddy the sound.

I second Oddiofyl's observation re SubDude. With my Velodyne HGS-15 and HGS-10 the SubDudes removed the boom and extended the bass.

db

Question: Anyone ever compare SubDude sub isolator with  IsoAcoustics Iso-200Sub Subwoofer Isolation Stand? They both are about the same price and with my wooden floor I need help with my SVS PC-2000! OR maybe just some cork blocks under a solid paving stone?

Again: Nobsound. 

Question: Anyone ever compare SubDude sub isolator with IsoAcoustics Iso-200Sub Subwoofer Isolation Stand? They both are about the same price and with my wooden floor I need help with my SVS PC-2000! OR maybe just some cork blocks under a solid paving stone?

I use subdude under subs and other iso stands like those under smaller monitor speakers (ls 50s and Vanatoo Transparent 1 Encores currently) but not subs.

Take your pick. Both are affordable and effective and should work well just be sure to get the right size. I can vouch for the subdude under subs.