kenratboy Posted December 16, 2004 Share Posted December 16, 2004 Totally getto. I bought 20 of the 90 cent 4" full range drivers Parts Express had about a month ago. Yesterday and today, I built v.1.0 Got a 12" wide, 5' long piece of particle board shelf from Home Depot and had them cut in in half (so 2, 12X30" pieces). I then took my 4" hole saw and cut a array of 4 holes on each piece in a: o o o o Pattern at the top (only takes up the top half of each board. They are 8 ohm drivers, 2 sets of 2 wired as so I get 8 ohms (2, 16 ohm pairs bridged to 8 ohms) Because I don't have the tools, they are open baffels - just a board. This is good because I am using a little 8" Jamo sub (the speakers are probably good down to 120 Hz. or so, not bad, this is a lot of cone area, 8, 4" drivers total) I propped them up against my stands, aiming up at about 15-degrees. WOW!!! Seriously, they sound a lot better than they should be. $8 worth of drivers, $2.50 piece of wood, $1 worth os screws and $.25 worth of wire. About $15 for everything! They have some mid-bass (not a TON, but they are fine) Mids and highs are very good. They seriously sound like they have a tweeter (speakers are rated to 15KHz.) They go LOUD, not Klipschorn with a 1000 watt McIntosh amp loud, but well above what most people listen to music at. Bad things: No bass, but a proper box might fix this (I have a dirty, dirty idea for 6 front facing, 3 rear facing drivers in a sealed box) Not at all sensetive (but my POS Sony receiver has plenty of power, so it is fine) Lacks the last bit of detail real speakers have, but danm, they are REALLY good, and remember the price!!! I'll post some pics later. Quote Link to comment Share on other sites More sharing options...
skonopa Posted December 16, 2004 Share Posted December 16, 2004 ---------------- On 12/16/2004 4:06:32 PM kenratboy wrote: Seriously, they sound a lot better than they should be. $8 worth of drivers, $2.50 piece of wood, $1 worth os screws and $.25 worth of wire. About $15 for everything! ---------------- And how much does Bose want for those 901s? Quote Link to comment Share on other sites More sharing options...
m00n Posted December 16, 2004 Share Posted December 16, 2004 Quote Link to comment Share on other sites More sharing options...
Jay481985 Posted December 16, 2004 Share Posted December 16, 2004 ---------------- On 12/16/2004 4:15:21 PM m00n wrote: ---------------- oh my god, laughing my ****ing *** off!!! Quote Link to comment Share on other sites More sharing options...
kenratboy Posted December 16, 2004 Author Share Posted December 16, 2004 Fine... Give me just a minuite. Quote Link to comment Share on other sites More sharing options...
kenratboy Posted December 16, 2004 Author Share Posted December 16, 2004 Sorry about the picture quality. I shot, processed, and uploaded them in under 5 minuites: SPK1, SPK2, SPK3, sure you can figure it out http://www.pbase.com/canonken/home_theater Quote Link to comment Share on other sites More sharing options...
kenratboy Posted December 16, 2004 Author Share Posted December 16, 2004 ---------------- On 12/16/2004 4:12:19 PM skonopa wrote: ---------------- On 12/16/2004 4:06:32 PM kenratboy wrote: Seriously, they sound a lot better than they should be. $8 worth of drivers, $2.50 piece of wood, $1 worth os screws and $.25 worth of wire. About $15 for everything! ---------------- And how much does Bose want for those 901s? ---------------- Certainly not as much as Bose - but good ol' Dr. Amar is a BILLIONAIRE. Thats with a B. Quote Link to comment Share on other sites More sharing options...
m00n Posted December 16, 2004 Share Posted December 16, 2004 U gonna close them into a cabinent? Quote Link to comment Share on other sites More sharing options...
kenratboy Posted December 16, 2004 Author Share Posted December 16, 2004 ---------------- On 12/16/2004 5:03:29 PM m00n wrote: U gonna close them into a cabinent? ---------------- Not this. The purpose of this was to see if they even sounded good! They do. I don't have any interest in making a normal speaker with a woofer and tweeter, I want to play with this sort of stuff. I am also thinking about making a large line array of some sort. Something fun and different. Also, having the open back throws some sound to the wall and opens up the soundstage. Not good audio math/physics, but it works I have 20 of these drivers and I plan on making something with 9 drivers per box (3 sets of 3 drivers gives me 8 ohms and a TON of cone area) Quote Link to comment Share on other sites More sharing options...
mike stehr Posted December 16, 2004 Share Posted December 16, 2004 A larger baffle will net you more bass. There is equation formulas for open baffles but I can't recall them at the moment. Try them if you want on a 4'X 8' baffle. Quote Link to comment Share on other sites More sharing options...
kenratboy Posted December 16, 2004 Author Share Posted December 16, 2004 Does the baffle act as a driver? My brain physics engine says yes. Quote Link to comment Share on other sites More sharing options...
DrWho Posted December 16, 2004 Share Posted December 16, 2004 no The baffle acts as a pressure boundary between the sound in front of and behind the driver. Without a baffle, the out of phase sound coming from the back cancels all output from the front of the driver. Note that this doesn't happen at higher frequencies because the driver itself is large enough to act as the barrier. Right now, I've got me a 15" JBL pro driver sitting on the floor plugged into my amp. I've got an 80Hz tone blasting away, but I can barely hear it. My amp is probably putting out 150watts and the driver has a sensitivity of 97dB. I am confident that the driver is playing the tone accurately because I can see the driver moving and I can hear it when I put my ear down close to it. I'm sure that once I get it into a cabinet (another type of pressure boundary) then I will be hearing tons of bass. Quote Link to comment Share on other sites More sharing options...
3dzapper Posted December 16, 2004 Share Posted December 16, 2004 Ken. If you want to have fun with one of those 4" drivers, build a transmission line cabinet for it. You might be amazed. This one from Ronnie Thakery at Carolina Audio uses a 4" Jordan driver Rick Quote Link to comment Share on other sites More sharing options...
m00n Posted December 16, 2004 Share Posted December 16, 2004 zapper, while that is a prurdy looking speaker, I have a hard time believing it would have much bottom end... Have you heard them? How do they shound? Quote Link to comment Share on other sites More sharing options...
3dzapper Posted December 16, 2004 Share Posted December 16, 2004 No m00n they definately need a subwoofer. But it is amazing the sound that can come from a single 4" driver! With a well built transmission line they should get down to 80Hz. Me, I like Klipschorns! Real man's speakers that a woman can live with. Rick Quote Link to comment Share on other sites More sharing options...
Scp53 Posted December 16, 2004 Share Posted December 16, 2004 And how much does Bose want for those 901s? ------------------------------------------------------ i think the bLo$E 901's are great speakers for the money Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted December 16, 2004 Share Posted December 16, 2004 3DZapper, I don't think I'm tracking on the transmission line terminology. Could you say more about that? Quote Link to comment Share on other sites More sharing options...
Tomski Posted December 16, 2004 Share Posted December 16, 2004 Daddy Dee-Do a google search for "Transmission Line Speakers" Its very interesting! Tomski Quote Link to comment Share on other sites More sharing options...
Joe Shmoe Posted December 16, 2004 Share Posted December 16, 2004 HA... mOOn, you crack me up! Too Funny. Quote Link to comment Share on other sites More sharing options...
m00n Posted December 16, 2004 Share Posted December 16, 2004 What? Hey check this out.... Quote Link to comment Share on other sites More sharing options...
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