My latest idea.

[jackfish]

I have numerous pairs of New Large Advent loudspeakers. My next idea for a DIY project is to make a pair of massive speakers based on the EPI 1000 adapting New Large Advent components to the design concept of the EPI 1000. Haven't figured out all the proportions yet.

www.theprojectasylum.com/electronicsprojects/adventspkrepair/adventspeakerrepair.html

www.humanspeakers.com/e/epi1000.htm

www.humanspeakers.com/diy/1000.htm

[garbulky]

A big speaker!

[jackfish]

The EPI 100 has an internal volume of .75 cubic feet, while the EPI 150 is 1.6 cubic feet. The New Large Advent (NLA) has an internal volume of 1.79 cubic feet. The EPI 1000 internal volume is a little over 10 cubic feet, or about 2.66 cubic feet per each tweeter/woofer combination. The low frequency extension of these speakers are rated at 45 Hz for the EPI 100, 35 Hz for the EPI 150, 33 Hz for the New Large Advent, and 22 Hz for the EPI 1000. Increasing the internal volume of acoustic suspension loudspeakers generally lowers bottom end frequency extension accordingly with driver characteristics. Since the EPI 150 is more similar in size to the NLA, it might be best to use it to determine a potential internal volume of this experimental loudspeaker. Using a simple proportion, arrives at 11.933 cubic feet for the new cabinet. The internal dimensions of the EPI 1000 are 72"x16"x16" or 10 2/3 cubic feet. The internal bracing eats up a little of the 2/3. More wanderings to follow.