longdrive03 Posted January 8, 2012 Share Posted January 8, 2012 Built this for a friend who is doing research on the effectsof subsonic bass on the human body. He needed something that would do 13HZ. It' s not small (25.5" cube with 1.5" riser and removable roller dolly). 1.5" thick walls all around (3/4" mdf inner and 3/4" baltic birch outer). Glued, clamped and screwed. Uses one CSS 12" sub and two CSS 12" PR's. Pushing it with a Behringer EP2000 amp. My friend has a signal generator program on his laptop that allows him to switch between various frequencies (17hz to 19Hz). I could hear 19hz but not 3Hz (cone was moving). The pr's have 900 grams of washers attached to a built in bolt with wing nut. Woofer has 350w handling with max of 500. Computer shows it will do 99 db at 13Hz with 100watt input with woofer moving 6mm and both pr's moving 19mm (out of 38mm xmax). First time I'm built with these and they are impressive. Need to get them inside (when my wife isn't home) to see how they do. 40HZ was loud and clear off my cheapo Sony garage receiver (65 wpc). He wanted them finished in truck bed liner to protect the cabinets. I added plastic corner protectors and elevated removable metal grills to prevent damage during transport to his seminars. Quote Link to comment Share on other sites More sharing options...
Guest " " Posted January 8, 2012 Share Posted January 8, 2012 technical details would make an interesting read. It looks well made. There are certainly countless design options for a sub. I'm thinking of a direct radiating sub as well using some isobaric principals only becuase space is tight, drivers are available and power is not shortage. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted January 8, 2012 Share Posted January 8, 2012 Cool project. Is he searching for the elusive "brown note"? Quote Link to comment Share on other sites More sharing options...
moray james Posted January 8, 2012 Share Posted January 8, 2012 He mignt just be. I think this thing works because I found proof in the form of multiple DOG particles in my park this morning. Nice bos got pics of the inside? Best regards Moray James. Quote Link to comment Share on other sites More sharing options...
longdrive03 Posted January 8, 2012 Author Share Posted January 8, 2012 He is researching the brains comprehension of subsonic frequencies. I now know that the fluid in my eye vibrates at 19HZ! He has a book out "The Resonance Key". Seems like a normal guy. Here are some photos of the interior shell and cutouts. Quote Link to comment Share on other sites More sharing options...
Boxx Posted January 9, 2012 Share Posted January 9, 2012 Excellent project.... Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted January 9, 2012 Share Posted January 9, 2012 I've been in my son's van when this sub hit 150dB @ 34Hz. It makes your voice sound like you're talking through a fan. Quote Link to comment Share on other sites More sharing options...
longdrive03 Posted January 10, 2012 Author Share Posted January 10, 2012 I hope you weren't hanging out of the sub when it hit 150db!!!! Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted January 11, 2012 Share Posted January 11, 2012 I hope you weren't hanging out of the sub when it hit 150db!!!! I think it would have spit me out. I was just tieing up the driver wiring harness LOL. Quote Link to comment Share on other sites More sharing options...
longdrive03 Posted January 12, 2012 Author Share Posted January 12, 2012 Update on sub. We hooked it up in my empty living room 13 x 13ft 12 ft ceiling last night. Couldn't get loud output and couldn't figure out what was wrong. My friend was using his laptop going through a Creative Labs DAC into the amp and we just weren't get much output. SPL meter showing around 70 db at full gain (32) on Behringer EP2000. Thought is was impedance match between dac and amp. Tonight ran my cd player with my cd test disc rather than the signal generator from the laptop. Ran it into a Carver HT preamp and ran out the sub output by rca cable into an rca to 1/4" phono plug connector into EP2000. Wowsers!!!!!!!!!! Hold on to your seat. At 20 hz (lowest test tone on cd) and a 14 gain (9 oclock) on amp this baby put out the bass. at 18 (10:30) it was rocking. Can't test the below 20 signal but per modeling at 100 w input 13 hz should be 99db (as well as 20 Hz output). My friend was a little disappointed last night and I was too. My wife kept saying she had to leave the house so her heart wouldn't stop!!! Will do some spl levels this weekend. So far I really like this combo. The video of the 20hz movement is really neat. Quote Link to comment Share on other sites More sharing options...
psg Posted January 13, 2012 Share Posted January 13, 2012 I use a cheap USB external sound card, Behringer U-ControlUCA-202. It has RCA and toslink output. I use REW (free) on a laptop to generate whatever frequencies needed. HUGE sub! Makes a Tuba HT look small! Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted January 13, 2012 Share Posted January 13, 2012 HUGE sub! Makes a Tuba HT look small! For size reference, the four drivers are 18"s. Quote Link to comment Share on other sites More sharing options...
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