Hi all.

After listening to the latest system in my "inventory" the QA-25

http://techtalk.parts-express.com/album.php?u=6127

for some time and receiving notice that my Dynaco A-25 original tweeters (SEAS 86H) has arrived in the mail, I canīt help wondering what happens when you run old, 30-40 years, paper woofers full range? I suppose that a lot of strange phenomena occurs when the piston-range is exceeded and the cone behaves in a number of odd modes.

Is this system-layot that I have inherited both in Marantz Imperial and Dynaco A-25 (XO= 1 cap on the tweeter) a mature design-choise from the designers of that time or is this because one lacked in understanding and measuring capability?

I will replace the Dynaudio D260 with the "original" tweets and XO at 1500 Hz and listen. Then I will design an LR4 acoustic alignment and see what happens.

This will keep me busy and happy until easter.

Best regards//lasse