What I'm interested in are tweaks that impressed friends or significant others WITHOUT being told beforehand that the tweak was done...If they were tipped off first, it doesn't count.
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.
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.
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