How old are your speakers

 I have a pair of altec 604 E. that are from the early 1960s. I have a pair of Fostex T 900 super tweeters to add to the top and a pair of 12 inch subs augmenting the bottom. This is my primary system and the only system. I used to have a pair of Tannoy Yorkminster's that were from around 2007 then moved to Tannoy golds and then moved to these Altecs. 
They are in custom boxes that are 3 inches thick all the way around and coated with anti-vibration coating. The empty box of one side is over 200 pounds. 

Main 2 Channel - Infinity Intermezzo 4.1Ts, circa early 2000s

HT - Infinity Interlude IL40s, IL36C, Modulus MS-1s, and MSW-1 also early 2000s

Computer - Elac Uni-Fi UB5s, a couple of years old

My previous speakers (Quad 21L) were 12.5 years old when I sold them. Current speakers are 3 months old.

i've heard the phrase 'bose, no highs, no lows' but i have 4 901's series 2 speakers which i bought back in i think 1972.

Current speakers purchased new in late 2005.