kramskoi Posted February 23, 2006 Share Posted February 23, 2006 Just thought i'd post some pics of my object of obsession since November of last year. What was then only envisioned, is now coming to fruition. I'm hoping it will be a nice match with my Synergy sb-2 system. I went straight from 8", all the way to what is arguably the best 15" driver available. The cabinet is a little over the top but i can rest assured that it is quite dead. The 2" front baffle will shortly become over 3" because the builder made the driver cut-out too wide for my taste. A 68 pound driver needs as much wood to adhere to as possible. The walls are 1-1/4" and there are 4 internal braces at 3/4". I've added some foam to the inside but that will be all. The only sound coming from this box is the cone, needless to say! I built an impedance analyzer and i've determined the exact Fb of the box. I will need this for the Marchand Bassis, which will be used to blend the sub into the room. I spurned the idea of an LT circuit...too much trouble and not enough options. The spring clip terminals will also get the axe shortly. I just needed to be able to test the impedance analyzer with the enclosure. I was'nt sure if i'd built it correctly. I'll probably get either the ep1500 or 2500 to bring the beast to life and safeguard against clipping. I'll see then, if i need a Behringer BFD. The box measures 21.5" cubed and 3.3 cu. feet (net) internal volume. Anyways, here are some pics: Quote Link to comment Share on other sites More sharing options...
DrWho Posted February 24, 2006 Share Posted February 24, 2006 You need to use the file attachment feature at the bottom in order for your pics to be visible to everyone else on the internet (gotta upload them to the internet - right now they're linking to the file on your harddrive). You can do one pic per post and it automatically gets attached to the bottom after you post your message. Quote Link to comment Share on other sites More sharing options...
sivadselim Posted February 24, 2006 Share Posted February 24, 2006 Yeah, we can't see what's on your hard drive; just the internet. [] Quote Link to comment Share on other sites More sharing options...
Jay481985 Posted February 24, 2006 Share Posted February 24, 2006 Yeah, we can't see what's on your hard drive; just the internet. [] unless you hack his harddrive like someone did to paris hilton's sidekick cellphone! [6] Quote Link to comment Share on other sites More sharing options...
billyjoe72 Posted February 24, 2006 Share Posted February 24, 2006 I see them. I see them. That's some big driver you have. Quote Link to comment Share on other sites More sharing options...
Jay481985 Posted February 24, 2006 Share Posted February 24, 2006 I see them. I see them. That's some big driver you have. I am going to get two of them !!! but he beat me to it but that is alright as long as were in different states! Quote Link to comment Share on other sites More sharing options...
TheEAR Posted February 24, 2006 Share Posted February 24, 2006 This is one heavy duty woofer in one heck of a inert,well braced and solid cabinet! Good work,now this is what I call a solid sub. [] You could probably place a few 1000 pounds on the box with no problems. Quote Link to comment Share on other sites More sharing options...
Chris Robinson Posted February 25, 2006 Share Posted February 25, 2006 Holy crumb buns!!!! [:S] Quote Link to comment Share on other sites More sharing options...
Jay481985 Posted February 25, 2006 Share Posted February 25, 2006 Oh if you don't mind, What was the cutout for the woofer? and what was the hole layout? I want to double check as I have the old hole layout. Thanks in advance. Quote Link to comment Share on other sites More sharing options...
kramskoi Posted February 25, 2006 Author Share Posted February 25, 2006 i'll tell you what it's NOT!...that's 14 5/8" like my builder did!...stick with 14 1/8" and if it's too small just hull it until it fits. I'm about to glue another 1 1/2" to the front baffle so i have yet to do the cut out but i'll probably go with 14 1/8", as noted above. I think adire calls for 14 1/4" for the tumult driver. Trust me, to see this driver is one thing, to actually lug it around is another. It's pretty massive. It will need as much wood to adhere to as possible. The consensus for a 68 pound driver is to use t-nuts. I'll let you know how it comes out after i cut the hole. I'm not sure about the hole layout. Quote Link to comment Share on other sites More sharing options...
Jay481985 Posted February 25, 2006 Share Posted February 25, 2006 I made one of two baffle cutouts but luckily it is 14.125 or14 1/8 whew! Quote Link to comment Share on other sites More sharing options...
kramskoi Posted February 26, 2006 Author Share Posted February 26, 2006 yeah, whew! is right...i did the cut out, today, at 14 1/8" and the driver still moves around (1/16" on each side)...14" would definitely work best. I'm not going to do another baffle, 14 1/8" will have to suffice. I don't understand why these drivers are'nt real world tested though. I hope that 1.5" will be enough to secure it properly. Quote Link to comment Share on other sites More sharing options...
Jay481985 Posted February 26, 2006 Share Posted February 26, 2006 1.5 should be fine.... Also yeah the cutout should have a bit of movement, did they give you a rubber gasket (washer) for the seal? Quote Link to comment Share on other sites More sharing options...
kramskoi Posted March 3, 2006 Author Share Posted March 3, 2006 Thanks Jay. The beast sealed up fine. This caused me the most worry over the past few days. I used black weatherstripping (wal-mart) and the included rubber gasket. No problem! I did'nt even bother screwing the new baffle...i think titebond will suffice...it's pretty darn strong! The enclosure was a b**** to lug around. I did'nt weigh it but i'm pretty sure it's over 100 lbs. I have a few bumps and scrapes from bossing it around. It's definitely a two-man lift now. With my enthusiasm (and patience) for sanding and painting on the wane, i put just three coats of black lacquer on the box. I may add more later once i clear my head. The 3.5" front baffle puts a "serious" muzzle on the driver...the cabinet is whisper quiet! I tested the sub yesterday, and i was seriously impressed. I'm running the sub-out from the yamaha to an older RCA rt2280 receiver via the "multi-channel-in" mode. The RCA sub channel is rated for 80 watts @ 8 ohms/.9% THD @ 1kHz (40-20,000 Hz). I'm not sure how much actual "clean" power i'm getting at 4 ohms but i was surprised by the level of output. I should have some real power by next weekend, then i'll secure the Bassis and BFD to finish the project. In my 1,800 cu. ft. space, i recorded a "clean" 90 dB @ 20 Hz...6 meters from the sub. This is near the back wall at one of two listening positions. I also scored 104 dB @ 28 Hz (~2 meters) and 81 dB @ 16 Hz (6m near rear wall) ,uncorrected, from a digital RS meter. All this from a substandard receiver. I can hardly imagine the output of the ep1500 at it's mono-rated 1400 watts. It's going to be an interesting weekend![] Quote Link to comment Share on other sites More sharing options...
Jay481985 Posted March 3, 2006 Share Posted March 3, 2006 holy crap uncorrect at 6 meters!!! I think it is about 6-10 db for every meter away!!! but on the other half that concerns me is the fact that you have not screw the sub in. I think that if you get up there in excursion that you may actually pop the sub out onto the floor which is NOT GOOD! BTW you used titebond???? Ummm that is going to be a permanant fix then ! You should never have used titebond to glue the woofer shut. Yes it is great for sealing but what about servicing the sub or so? Quote Link to comment Share on other sites More sharing options...
kramskoi Posted March 3, 2006 Author Share Posted March 3, 2006 Ooops, now i've done it...*giggle*...no,no, no Jay. I meant the front baffle. Had to add another 1.5" because of cut-out errors on the original baffle. I used eight (#6) 2" wood screws to secure and seal along with the weatherstripping. I'll tighten it a bit more until it settles. It's pretty airtight as is though. ZERO resonance from the cabinet so far! I was thinking about using 3" screws for additional support of the new front baffle but titebond is really all i need. After the first 30 minutes of bonding, i was unable to move it at all! No way would i seal the driver with titebond!...lol...sorry for the confusion. My room is on the small side and it has a unique shape. There is a cubby hole which is 6' wide X 10' deep. With the sub sitting corner-loaded in this hole, that part of the room acts as sort of a bass horn. I recorded the 104 dB (28Hz) as it opens into the larger part of the room. I also have the advantage of being able to totally seal the room if i need to. The 20 Hz and 16 Hz readings were taken at >6 meters. The sub is sitting behind the LCD and side-firing. The rear wall reinforces the bass wave so this probably influenced the readings. All of the readings are uncorrected. Not too bad for less than 100 watts of power. I was so impressed with the output of the sub (with the little RCA) that i've taken the klipsch ifi and the m&k out of service. I'll be sending both to ebay shortly. The tumult sounds as articulate as the 8 inchers it has replaced. It pounds at the appropriate moments and is silent otherwise. I expect even better with the marchand bassis on tap for on-the-fly Q adjustments. The only bummer is that i'm back at work so i can't play around with it. I think that positioning and the anti-resonating cabinet has subdued my 75 Hz room node to the point that i can run the crossover at 80 Hz instead of 60. I can already see rb35's in my future...probably next year. For a final tidbit...i was able to exceed, handily, the combined output and clarity of both the previous subs combined...it's not even close! And with less than 100 watts...incredible![] Quote Link to comment Share on other sites More sharing options...
Jay481985 Posted March 3, 2006 Share Posted March 3, 2006 thank god! I thought well you know. But the screws, I am going to buy the machine screws from mcmaster-carr and I already brought some hurrican nuts 10-32 for the baffle. The measurements are crazy! Also I am glad you like it and the tumult is one of the ultimate subwoofers hence 100 watts is all it is needed to kick the ifi and m&k *** btw woodglue like titebond and such is stronger than the wood itself surprisingly. Glue two pieces of mdf and then try to break it with a hammer, the wood will break but not the bond Quote Link to comment Share on other sites More sharing options...
DrWho Posted March 4, 2006 Share Posted March 4, 2006 holy crap uncorrect at 6 meters!!! I think it is about 6-10 db for every meter away!!! You lose 3dB for every doubling of distance. So at 2m you are 3dB down from the rated sensitivity at 1m. At 4m you are 6dB down and 8m is 9dB down, etc etc...losses in an enclosed room are actually less due to the pressure loading and reverb in the room. Quote Link to comment Share on other sites More sharing options...
Jay481985 Posted March 4, 2006 Share Posted March 4, 2006 http://basszone.stryke.com/deonspace/cabin.html it is a car so different beast but.... Quote Link to comment Share on other sites More sharing options...
OneTwoMany Posted March 4, 2006 Share Posted March 4, 2006 You actually lose closer to 6db with point source speakers, line array's will be more like 3dB. subwoofers are point source.. at least only the ones we can afford. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.