kryptonitewhite

fuck it lets just do it already

I forgot about sealed up. I have 2 16.5" cutouts for the 2nd subs, I'll stick a 2x4" though each port after we sweep with .75" port lengths, turn them float against the wall over the port from the inside, and bolt the 16.5" circles over the 12" holes to seal the towers up and run sweeps sealed. Also I will try to get the sliding door track so I can shut the vault for the sweeps. All sweeps lately have been with the vaulted door open as I dont ave the track yet.

I tought brandy how to run REW today so that she can run the sweeps on the PC while I adjust the volume on the receiver so we dont bottom with the ports cut out then with the new ports in. Tomorrow we're getting 2 sonotubes 12"x48" for 6.5Hz tunes. We will run compression sweeps in 5dB increments from 40dB to 15dB then 1Hz to 14dB, 13dB, and 12dB... I have gotten to 10dB without hard bottoming but I dont push the new subs like I did the reconed subs. Then I will cut the ports out, run more sweeps, put the new ports in and run more...overlay them all. REALLY FUN VIDEO of us running sweeps with REW and sine waves with NCH Tone Generator to see how bad flex is, where it is, what we need to do to fix it, and getting an idea if we can fix all the room flex and noises. 4 ported 18s in a tiny room gets very annoying tuned so low. I am at a breaking point of just getting rid of it, or attempting to fix the towers (theyre actually not that bad, all of the noise is the room, not the enclosures) as they lose a lot of output from 25Hz-40Hz from flex. So we have an idea what to expect if the 12" x .75" port actually works fr spl x if I like the 6.5Hz tuning, we will most likely enjoy the towers for a while longer, get more wood, build the manifolds and ports onto the door, then swap the subs...leaving the towers up just in case. KW

Well running REW in my van certainly did a lot for me. I recognized visually what i was hearing, something was wrong with the subs: BLOWN AMP therefore a sub acting as something like a PR with a bit of power to it, making my port a 20" leak in the box. I saw that at my crossover points I had huge dips, phase issues. I also saw that despite having 2000 RMS available up front, 8 very good drivers in sealed enclosures, and a bitchin crossover system... my front stage was weak. Matched up with what my ears were telling me. I sent the amp in for repair and it should be back any day now. I wanted to test my front stage and get it where I want it, that way when i get the subs, I run 2 sweeps...regular and subs 180 degrees, pick the better of the two and be done...well, run sweeps with EQ too. The front stage situation, I hate mids. In my case the 710Hz-14kHz my FR125S's cover. If I could quadrouple my subs, Extremis, tweets, and power on them all...and leave the FR125S's as are... I'd be a happy camper. My tweets, I had a new build house issue. I started off with 2 2005 Vifas on a KX200.2 thinking the KX amps were 4ohm stable, not 2 ohm. I was getting half the power, and with my wanting tons of 14kHz and up and no 14kHz down, I was getting clipping and break up: bad. I ordered a 2nd pair of Vifas, but since 05' they changed significantly. My 200.2 was running parallel 2ohms now.that helped... but the new tweets were MUCH louder and sounded quiet different. I worked with Madisound extensively after I blew both new tweets. I upgraded to the SX500.2, used it's 36dB/oct slope in conjunction with the PXA-H701's 30dB slope... now I am golden. But after blowing the first 2 I was scared. Well I stepped up to the plate and turned the FR125Ss back up and the tweets back up, reversed phase on the Extremis, now I am golden! First some pics of the new mustard! I havent spray painted them yellow yet, but here's the re-rejob: redid the mic rig: Set the PC up a little more friendly: Initial sweep after working volume up slowly for safety 2nd sweep windows up to compare. 2nd sweep windows up to compare. PHASE play!

I'm not abandoning this build, I am just slowing down and being more cautious. After making those vids today it reminded me just how much output I already have, just dont use it much. I want more in the single digits which means a huge sacrifice in the double digits and IDK if I am willing to make that trade. I'm going to brace and tune to 6.5Hz for a while and see if I like it. If I can deal, then I make continue this build to shift the FR to get more down low with more airspace.

TCSounds has an upcoming price jump esp on the 5100 PRO since it has neo... 40%, $899 to $1200

Well I never planned on using the mic in the house anymore cuz I swept, reswept, tried it with heater and all lights on, kitty sitting in the LP to see if his fur soaked up deebeez... I got mic'ed out so i tore the rig apart and rebuilt it for the van. Well I wanted to lay to rest the large port diameter short port length problem, planned on doing a sweep before I tore the ports out, then a sweep after I ripped the ports out...then tear the towers down. I haven't dropped the hammer on the volume knob in a while..WOW I forgot how powerful there are. I can't do it. I'm sorry, but i jsut can't. Since I have the rig all set up, I may as well do a sweep anyway. So it is in my head now notnyt and Bosso, I got it... I am good to 9Hz then I am DEAD. This sweep clearly shows it. I am going to get 2 more 12" x 48" sonotubes, rip these ones out, add bracing to fix the buzzes and rattles and that terrible suck out from 25Hz-37Hz.... and retune to 6.5Hz again. This time I will take my time now that I know better instead of listening for a few minutes then cutting the ports shorter. If I like it, if I can deal, I will stay tuned to 6.5Hz.... but i suspect I will raise it to 9Hz or so. I'm gonna tear the rig down and go run REW in my van some more, see if flipping the phase on the 6.5's helped and I raised the level on the 4.5s and tweets. Hopefuly I can get the front stage tweaked, my sub amp should be back any day, then I can phase shift the subs and get it all flattened out

I can't tear them down now. I'm getting more 12" tube, more caulk, and more 2x4s.... plus I gotta do something to my room but i don't even know where to begin. I'm gonna go back to 48" port lengths 6.5Hz tune and slowly chop them shorter if I can't handle the reduced output traded for single digit extention. Graham made a great suggestion to make a vid of this track, Ive done it before. I haven't pushed the Towers much for quite a while now, sold all my DVDs and Blurays cuz they all just got old, my PC sucks... I dropped $$$ on a Radeon HD 4550 7.1 surround sound HD card to watch Netflix and HULU in surround, but I only get 2 channel output from the card so I have to turn my mains and surrounds all the way sown and my subs all the way up to get anyoutput and it's weak. I was gonna tear them down today, was testing out the track to find my limits, and the fan blades started spinning again..Ive never been able to catch that on camera...not just bouncing but spinning. Now I remember how much output I get and I am afraid to tear them down now IDK what to do!

is that you holding up a motor in your avatar?

I hope it's fun to watch Ideas are constantly filling my pea brain, I'll try to update as much as possible. Under the door needs sealed up so I will have a larger piece of 1/2" MDF in the doorway bottom with a 2x4 glued and screwed to it to complete a full rectangle door jamb with weather stripping to make an airtight seal and prevent buzz and rattle. The closet in the spare room is well over 10 cubic feet so this will actually be over 1000 cubic feet. When i build the double layer manifold, the outter layers will be extra long to add strength to the entire door... the manifold itself and 4 18's will be quite heavy... but more so to help prevent cancellation. I have an idea and a little experience that larger fatter ports that i use since I love huge airspace creates unloading and cancellation much more than smaller longer ports. There are SPL setups in vehicle "walls" where there is actually not a wall. About 1/3rd of the "wall" is subs mounted in several layers of mounting rings, but in between each sub it is cut out... more port area..each subs mounting rings are only as wide as the mounting flange itself. The other 2/3rds of the "wall" is port as well. Basically they have 10-20 subwoofers all on a horazontal plane but nothing in between them, acting as port, and to the side all open. This creates an ultra high tuning in the 70Hz - 80Hz range with an enclosure volume from 20-50 cubic feet. When they go below 70Hz I believe they unload quite a bit more than a guy with one sub in 3 cubic feet with a 4"x4" port 30" long when he plays below his tuning. So anyway, I believe my bringing the sides of the manifolds all the way down to the bottom of the door and extending the bottom of the manifold out a ways will somewhat act as a port itself, cupping the actual ports. I believe I will end up tuned below 8Hz when this is all done. Today I will set my REW mic stand back up, reinstall REW, then make my final Twin Towers video, a request from Graham. I'll make the vid, run a few sweeps as it is, then I will cut the ports out...leaving the ports 12" diameter x 3/4" length and run a few more sweeps. Ive had threads discussing whether extremely short port lengths with very large diameters fully function, and if yes or no, does this change with output levels...maybe at low volume it works but at moderate and high levels it does not. I am afraid that over 1000 cubic feet, with 2 2" long ports with a lot of area, will not really act like ports. I am also worried that with them being so large in area but so short with all 4 subs mounted right next to them, cancellation and unloading will be a big problem. FINAL PICS OF THE TOWERS: hopefully those pics last a little while before bandwidth runs out. With the new project drawing more attention, as views and hits get high I get emails that they will be disabled for 30 days. Happens a lot on weekends and holidays.

Also I'll also be putting a big wheel or a pair of big wheels with constant pressure, either spring loaded or air filled tires. I'll mount them partially deflated then air them up and squeeze them back on.

I have decided to take Thomas-W's advice and build a manifold on my door to house (4) Fi IB3 18's on the top and make 2 slot ports on the bottom out of the rectangles already there. The door is 1.25" thick, I will make a template/face of the entire door adding .75" to the thickness. I'll make a 25"x25" panel to plug the ports so I can run true IB as well. Here is a pic he suggested for me. I will begin tearing the Twin Towers down tomorrow and use the wood to build the manifolds and ports. It will be nice to get the EP4000s out of the HT room cuz I haven't done the fan mods. The IB3s are custom dual 4 ohm, 4 layer IIRC, series/parallel 4 ohm bridged per EP4000 (2 EP4000s, 2 subs per amp bridged). I am wasting and tearing apart a very wonderful performing pair of enclosures. Under 10% THD these things hit 124dB @ 10Hz and 130dB @ 23Hz. If I would have braced them better that 25Hz-40Hz would have been fixed. They were 125 cubic feet each with a 12" port 12" long for a 13.4Hz tuning, 2 IB3s per tower. Here is the Twin Towers build log: http://www.avsforum.com/avs-vb/showthread.php?t=1231247 Here is the new one:

I have decided to take Thomas-W's advice and build a manifold on my door to house (4) Fi IB3 18's on the top and make 2 slot ports on the bottom out of the rectangles already there. The door is 1.25" thick, I will make a template/face of the entire door adding .75" to the thickness. I'll make a 25"x25" panel to plug the ports so I can run true IB as well. Here is a pic he suggested for me. I will begin tearing the Twin Towers down tomorrow and use the wood to build the manifolds and ports. It will be nice to get the EP4000s out of the HT room cuz I haven't done the fan mods. The IB3s are custom dual 4 ohm, 4 layer IIRC, series/parallel 4 ohm bridged per EP4000 (2 EP4000s, 2 subs per amp bridged). I am wasting and tearing apart a very wonderful performing pair of enclosures. Under 10% THD these things hit 124dB @ 10Hz and 130dB @ 23Hz. If I would have braced them better that 25Hz-40Hz would have been fixed. They were 125 cubic feet each with a 12" port 12" long for a 13.4Hz tuning, 2 IB3s per tower. Here is the Twin Towers build log: http://www.avsforum.com/avs-vb/showthread.php?t=1231247

I know I brain storm fast and take quick turns out of nowhere, now I am really liking Thomas-W's idea. I just went out to my garage and pulled an old door down, it's too short and wide... was hoping to spare the door I have now... but after all the other things I have done to it, what the heck. The current door, the top rectangle dims are 21" wide 49" tall... if thats not perfect... I can cut 49"x21" panels for the manifold back layers and 49x21" panels for the sides... 2 or more layers thick. So 21"x21"x49" manifold like pictured above. The bottom is 21" x 18", I can either cut it ou as a square and make a slot port thats easily pluggable with a panel cover, or I can hack it to a 21" diameter circle and use the 20" sonotube up to 48" length so it clears the wall when opened...but not so easily pluggable.

How much do you know about tapped horns and 6th order BP? My current roadblock is, will 1/2 of the front wave go backwards through the port/hallway/manifold?

before I go completely screwing things up I'm going to get more 2x4s to do side to side bracing and get 2 more 12" pipes, 48" for 6.5Hz. doesnt look near as bad until 10Hz HP is added for electronics roll off. fr lotta watts spl

got to thinking the front wave will go backwards through the manifold as much as forward without a back on it, IDK how this works in a tapped horn or 6th order, more thinking. Maybe manifold on top of the port.

its very challenging, keeping things from flexing to avoid dips and nulls as well as buzzing and ratling, gotta go so much lower, much less cabin/room gain... keeps ya busy though!

When I only had 1 sub per tower you couldnt hear anything outside, the FR was flat to 20Hz then spiked 4dB at 15Hz, now with 2 per tower its flat to 30Hz then dips 5dB to 10Hz and its loud as hell outside and shakes my neighbors windows. I boarded up my window on his side of my house, didn't help any but he's cool about it.

I am pretty sure this is what I am going to do. My MDF is actually 97 x 49..sheesh. I'll have to butt up part of a 2nd sheet to the end of each side and top (bottom too?) for a total length of 70". I want to mount the subs side by side, at the top, and run 2x4s between them... 4 in each "corner" of the subs so 4 of the mounting screws will go through the subs and into 2x4 studs like in the towers. So I will need 21" wide off each sheet, leaving 28" pieces. I'll take those 28" pieces and make the end caps for the rear waves, that leaves over 10" clearance from the closest wall to prevent the air getting trapped/loaded into a corner. 830 cubic feet 41" x 95" x 70" port 10Hz tuning

or I can slide woofers 29.5" back so I can leave door in, leaving 19.5" for the subs to mount at the end of board 1. 4x8 is actually 49 wide. I still couldn't use it with the door shut, but I'd still have a door. What would all this accomplish by tearing the towers down? You guys would think getting space back. I suppose yes, but thats not the driving force... exactly. One, I need easier access to the spare room. Right now we have to walk up the bleechers, step up the side shelf, open the door standing on the shelf, climb down to the floor, back up, reverse process. It's a pain going in and out of the spare room several times a day. Two. Most of you know I am a post you-know-what. I crave attention, even if it has to be bad it's better than none. The towers have died, there's nothing left but to listen...well, it needs more bracing, then left alone. Three... The towers are dead! Now what do I do? The fun of it is building, posting, testing, modding...its finito! Morte! Four.. I love thinking, plotting, planning, building, realizing, modifying... the process itself. Its just what i do. I need to keep on doing it. Five: I need more low end FR! MORE! The "low" bass, "mid" bass, "high" bass all overpowers my ULF. ULF is very hard to create and easy to get burried under lesser SPLs of higher frequencies. I LOVE the ULF, like the rest, but I get way more of the rest. SIX: cuz I am KW :-P I still want desperately to try IB, so you all know full well i will design another door for the other end so I can seal it up with the BR door open and go tru IB

alright, I may skip the option of plugging for IB and build a hallway walk through port/manifold off the outter edge of the door frame and remove the door. The outter dimensions of the frame are 41" wide and 95" tall... perfect. I can either go 1 sheet of 4'x8' long and put ends going outward at a 90 degree to further prevent cancellation of the rear wave, or 2 sheets long doubling port length and reducing cancellation of the rear wave while tuning lower. I haven't slept yet, I had to retype all that and edit my pics. At first I thought I was leaving the door in so i could plug the port and keep a door on the spare room... then i realized if I shut the door, um, hmm... I am sealing the subs off altogether...and with it open it would obstruct the 2 subs on that side unless I move them down past the door, defeating the purpose of the long hallway in the first place to prevent rear wave cancellation I need to go to bed. this is using 2 wide for longer port length, lower tuning this is only 1 wide and blocks at the ends to reduce port length but kill more rear wave cancellation this is 2 wide, long port, door in (DOH) would have been able to open and close the door inside the halway/manifold/port this is 1 wide short port door in (DOH) 2 wide long port door gone 1 wide short port end caps for rear wave door gone sleepy time

until I sell the IB3s to get these Ill run them in this current towers red, room box yellow fr 2400 watts keeps both under Xmech... I surpass Xmax all the time doesnt bother me other than headroom...

heres some playing around I have done, nothing concrete