Designer:
Ron Erickson
Category Division:
Open Unlimited
Describe your Speaker Design:
TMWW fully active 3-way.
Design Goals:
SOTA active system with the best drivers I could afford.
Driver Selection:
Vifa NE225W-08
BG Neo8-S
Raal 10-70D
Enclosure Design:
1.5 cu.ft. sealed woofer enclosure with separate enclosure for mid and tweeter mounted on standoffs.
Enclosure Assembly:
Baltic birch plywood panels veneered with quarter sawn cherry with cherry hardwood edges. Woofer cabinet is internally braced, lined with cotton insulation and stuffed with Acousta Stuf polyfill. The Mid-Tweeter cabinet is the same except it needed no bracing.
Crossover Design:
Active crossover is created with Ultimate Equalizer software running on a DIY computer using a Delta 1010LT multi-channel sound card. Crossover points are at 400Hz and 4000Hz with 48db/oct LR slopes. UE software also does EQ based on measured driver response. It has the capability to compensate for room response but that feature will not be used for the contest as there will be no opportunity to take in room measurements.
Conclusion:
I couldn’t be happier with the capability and sound quality of this system. When I demonstrated them at DIY Iowa 2013 one attendee told me it was the best speaker demo he had ever heard anywhere.
Build thread. http://techtalk.parts-express.com/forum/tech-talk-forum/58628-grinnell-or-bust?239377-Grinnell-or-Bust=