[quote author="Kid Squid"]Wavebourn,
fancy showing some pics ?, got a house build coming up soon, and I'm gathering ideas for different things - speakers is one of them....
[/quote]
Woofers on the floor made of solid concrete (really, a composite material since ordinary concrete shrinks and cracks); Alpine SWR1242D drivers are used. I take 40-200 Hz frequency range from them (36 Hz Fs, sealed boxes -- no mechanical resonances used for equalization). Volume inside is damped by memory foam glued to linoleum glued to concrete.
Stereo speakers made as line arrays. As the result, no "sweet spot" because line arrays fire cylindrical wave, i.e. horizontal dispersion is wide, vertical directivity is narrow. Also, reflections from floor and ceiling are minimal. Excursion is small, and 50W drive gives 120 dB SPL that is more than enough and nearly equal on any distance in my room. Each side uses 8 cannibalized Infinity Reference 4" speakers (with tweeters removed and dust caps added). For tweeters each side contains 16 Fostex speakers made for notebooks.
Center channel contains 2 Infinity Reference 6.5" speakers, also cannibalized (tweeters removed). For tweeters I used array of 64 speakers made for cellphones (narrow pole in the middle, in front of
sitting listeners).
Since left side is close to the wall I put there a pillow made of memory foam and covered it by a flag with my family coat of arms.
2 rear speakers are again Infinity Reference 6.5", wall between them is covered as well by a memory foam.
For effect channels I use an ordinary Marantz 7200 amp (it has the best surround processor I ever heard), for stereo I use a tube amp I built with 4x6L6 per channel (I take 50W from each channel only). The amp has stabilized screen grid voltage (lowered for better linearity) and works in class A. I build my SE-PP Alligator to replace it.
Subwoofer: it is a concrete horn under the floor, with 2 12" Pioneer drivers.
I take from it frequencies below 40 Hz. It is made horizontally, curved up and opens to the room through a big went hole.
A wall above contains a fake door, made of 2" plywood, coveded by linoleum, memory foam, and vinyl. The sub is driven by my SS amp that works in class A+C. Nice (it is 3-channel, drives woofers as well).
As the result, I got very good and clear sound image, using few properly designed and placed speakers. Though, my wife don't like linoleum on the wall in a bedroom (line arrays are mounted in the wall), so I plan to cover it by concrete sheets.