DrWho Posted April 3, 2006 Share Posted April 3, 2006 No, don't fill the dog house. In fact, don't put stuffing on any of the vertical portions (I just noticed that's pretty much what it comes down to). Stuffing at the bottom of the bass bin is probably not needed either. You don't want stuffing inside the dog-house because the shape and acoustical space acts as an acoustic spring which affects the behavior of the driver through the horn. The reason the ported mod works so well is because it does not affect the behavior of the spring. The end purpose of damping in the cabinet is to reduce the magnitude of standing waves (so that they don't inadvertantly get amplified and then make their way out of the ports). And standing waves are only going to happen between parallel surfaces. Quote Link to comment Share on other sites More sharing options...
BS Button Posted April 3, 2006 Share Posted April 3, 2006 Nice to have stiff competition with a Mississippi boy. I know all about STIFF competition....right Todd. Looks like your cabinets and mine will have a bunch of BEC stuff. jc Isn't it interesting that a couple of Mississippi boys are taking on the most DIY projects, flanked and supported by a dude from Arkansas. Where's Terry? JC, wendja add teeth to your Mac avatar? BS Quote Link to comment Share on other sites More sharing options...
Marvel Posted April 3, 2006 Share Posted April 3, 2006 Santa, I hope you fire these up soon. I want to know what you think. They look so good. Are you going to put a finish on them at some point? Bruce Quote Link to comment Share on other sites More sharing options...
jwc Posted April 3, 2006 Author Share Posted April 3, 2006 Ahh, the big Mac just gets happier and happier hooked to the dbb's. Still haven't build anything to top those mammoth speakers. Yes the Southern folks doing lots of tinkering. Bob's shipping items are at my doorsteps in two days from the order. Unlike ordering from Solen. Hell, that takes weeks and the packing job is always terrible. Packing materials are hanging out of the box when I get them. Terry is still floatin me emails. I'm just waitin for him to build his own dbb's and for you to build the Bass Cannon![] jc Quote Link to comment Share on other sites More sharing options...
BS Button Posted April 3, 2006 Share Posted April 3, 2006 That would be a very tall (and wide) order, JC. Quote Link to comment Share on other sites More sharing options...
jwc Posted April 3, 2006 Author Share Posted April 3, 2006 Actually. Same size as my Cornscala. Just needs more cowbell. With this post, I have just one more post than you....haha. Quote Link to comment Share on other sites More sharing options...
Rotorhead09 Posted April 4, 2006 Share Posted April 4, 2006 Well, Guys I fired these puppys up last night and I am less than satisfied. I ran them without any port tubes to see what they sound like. (crap) I notice that the mids and highs are not as prevelant, I hooked up the factory one and one of the project ones together and switch back and forth between the two to listen to the difference.The bass on mine did not have a solid punch like the factory so I decide to seal off the top in mine to mimic the factory to try and achive a factory sound to start with. The factory LS had a more solid punch. As someone once said the snare had a kick to it. Standing in front of each one of them, the factory LS diffanatly had a more solid punch then the project speaker this is even after I sealed the top of the project speaker to mimic the factory one. The next thing I was going to do tonight is try to complete one of the project speakers with the ports (7") and isulate (per Dr Who) and leave the other one like the stock set up with top sealed off. What bothers me is that when I sealed the top off the project speaker I was expecting it to sound like the factory one. But still no kick! So another experiment I was going to try was take the factory crossover and put it on the project speaker to see if I get factory results. I have no fancy meters just my ears and my chest to feel. The bass lows seem to be the same but no soild kick from the project one. I do have the woofer wire between the board that seals the top on the project one passing through. Could that little bit of air leak cause the bass to be flat and not soild (punchy)? I guess I am trying to achive a starting point. Get it to sound like factory and modify from there... Any feed back would be great. Quote Link to comment Share on other sites More sharing options...
DizRotus Posted April 4, 2006 Share Posted April 4, 2006 "I guess I am trying to achive a starting point. Get it to sound like factory and modify from there..." That's the approach I would take. How about inverting the factory unit on top of the project? Then use only the bass bin (sealed at the top of the doghouse and connected to the factory network) of the project to see if the bass sounds like the factory units. If it doesn't, then figure out how and why the project bass bin differs from the factory. If the project bass sounds the same, then change variables, e.g., ports, networks, Crites tweeters, etc., one at a time to evaluate each change. Quote Link to comment Share on other sites More sharing options...
Rotorhead09 Posted April 4, 2006 Share Posted April 4, 2006 Neil, You know, it's not just the bass sound on the project speaker that differers. The mid and highs are not as prevalent ether... Just has a flatter sound in comparason. I guess it would have been ok if I had not set them side by side and did a sound check. That is why I was going to switch the crossovers to see if the sound changes. That will help me narrow down the possible couse of the problem whether it be crossovers or drivers that differers. I thought the Crites tweeter puts out more highs? Not hearing the cymbals as well in the project ones. The mids and the highs I can live with but that dull bass is not going to cut it. Quote Link to comment Share on other sites More sharing options...
DrWho Posted April 4, 2006 Share Posted April 4, 2006 What woofer are you using in your project speaker? Try inverting its polarity. Btw, you are doing the listening comparisons between one speaker playing at a time, right? And you are are doing so with the exact same source material? (one of them isn't L and the other R). Another thing you might try would be to swap the drivers between the factory and your custom cabinets...and see if the problem follows the driver or the cabinet. Quote Link to comment Share on other sites More sharing options...
Marvel Posted April 4, 2006 Share Posted April 4, 2006 What bothers me is that when I sealed the top off the project speaker I was expecting it to sound like the factory one. But still no kick! So another experiment I was going to try was take the factory crossover and put it on the project speaker to see if I get factory results. I have no fancy meters just my ears and my chest to feel. The bass lows seem to be the same but no soild kick from the project one. I do have the woofer wire between the board that seals the top on the project one passing through. Could that little bit of air leak cause the bass to be flat and not soild (punchy)? I guess I am trying to achive a starting point. Get it to sound like factory and modify from there... Any feed back would be great. Positively! That back chamber (doghouse) must be sealed well. Quote Link to comment Share on other sites More sharing options...
Rotorhead09 Posted April 4, 2006 Share Posted April 4, 2006 Hey Doc, I got all my parts from Bob C. I am using the left channel and switching between a & b using same music. I will keep the driver swap in mind. I am going to do the crossover swap first since it will be the fastest. Santa Quote Link to comment Share on other sites More sharing options...
Rotorhead09 Posted April 4, 2006 Share Posted April 4, 2006 Bruce, I was wondering if that little bit of leak might change things. By just putting that top cover on last night was a quick patch mode. I will try to pass the wire through better before I start my runs tonight. The rest of the dog house is sealed with glue & silicone. Santa Quote Link to comment Share on other sites More sharing options...
BEC Posted April 4, 2006 Share Posted April 4, 2006 Santa, If you just cover the hole to the bass bin, you will still have a volume difference between the back chamber volumes. Don't know how significant that would be. Also, you can power the woofers directly from an amp to more easily compare bass output. Bob Quote Link to comment Share on other sites More sharing options...
jwc Posted April 4, 2006 Author Share Posted April 4, 2006 Roto. Not that this will make a difference but your driver from bob is the CW1526. The one in your La Scala is a K33....what year is the scala. I too would be scared of the right and left comparison. I would keep everything the same and switch the each speaker to the "other" listening position....and do the same comparison again. I got burned with this once recently. jc Quote Link to comment Share on other sites More sharing options...
DrWho Posted April 4, 2006 Share Posted April 4, 2006 Are the TS parameters for Bob's products available? I would love to run some numbers... Quote Link to comment Share on other sites More sharing options...
BEC Posted April 4, 2006 Share Posted April 4, 2006 Who, Lots of data in this thread. http://forums.klipsch.com/forums/thread/705763.aspx Bob Crites Quote Link to comment Share on other sites More sharing options...
DrWho Posted April 4, 2006 Share Posted April 4, 2006 oops, apparently I missed the specs the first time round...thanks Quote Link to comment Share on other sites More sharing options...
Rotorhead09 Posted April 4, 2006 Share Posted April 4, 2006 JW, The year the LS was purchase early 80's I am doing the comparason on the left channel on both speakers. just switching a to b. I understand that the CW1526 is eqivalent to the K33? I think I will try to reduce the dog house close as i can back to stock and make a better seal. The dog house volume increase when I raised the top section. Also make a better air tight seal on the make shift top. Hope for a better report tomorrow. Quote Link to comment Share on other sites More sharing options...
Rotorhead09 Posted April 7, 2006 Share Posted April 7, 2006 After many nights of playing with the ports, this is what I have settled with. Ports cut to about 7 1/2". That is where it seems to sound the best. I got the punch back. But the bass seems to roll out a little longer. I have to give up for a while because my hearing is demishing! Quote Link to comment Share on other sites More sharing options...
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