jwc Posted August 14, 2008 Share Posted August 14, 2008 OK. So I've started noodlin with your Mach driver Please remember I'm not showing thse things for a contest of the Lab 12 vs 18" drivers. I'm just trying to understand a possible change of plans with 18" drivers. Also remember...I might have to XO up to 100Hz. my midbass horns aren't finished and I will need to run curves to see how well they perform down to 80Hz. Now....what I have is a comparison of 4 Lab 12 wired parallel in a 20 ft enclosure and 3 mach 18" drivers wired parallel in a 20 ft enclosure. I tuned them slightly different just to get similar curves and to flatten them. What these curves don't show me is the amount of "movement" from the drivers. jc Quote Link to comment Share on other sites More sharing options...
sienna Posted August 15, 2008 Share Posted August 15, 2008 Way too go awsome work.....looks real pretty... Quote Link to comment Share on other sites More sharing options...
Ricci Posted August 15, 2008 Author Share Posted August 15, 2008 JW, Maybe you should start your own thread for your project. Those graphs look fine. If you are going to use the 18's ported you should skip the MJ18M's. 20cu ft is not enough airspace to do justice to 3 or 4 ported 18's tuned that low. Use 2 18's and jump up the Mach5 line up to the IXL18. Try modeling 2 of them in 20 cu ft. I'd take these over the Lab 12's, soo much more extra headroom. Another option that looks good is the Dayton Audio Reference 15HO. 4 of those in 20 cu ft model almost exactly the same as the Lab 12, but once again you have much more cone area and displacement ability for extra headroom. Model these and the IXL's with 750 watts as compared to the Lab12's and look at the driver excursion graphs. The 15's and 18's are working much less hard and are capable of taking more power in this kind of enclosure. Quote Link to comment Share on other sites More sharing options...
Ricci Posted August 19, 2008 Author Share Posted August 19, 2008 Here is a new set of measurements using a shorter sweep. I think it's about 5secs. Much shorter than the grueling 21.8sec sweep used in the last set. The highest level sweep is IT. That's everything that this system can give when doing this sine sweep. The shorter sweep allowed a bit higher levels, but as you can see there is a lot of compression going on at 9-11hz and 30-50hz(???). This is at the ragged edge of things. The system is amp limited technically, but I don't think that any more power would get much more out of the driver. The amp actually tripped the breaker on the surge protected power strip that it's plugged into once and self protected twice when trying to determine the max sweep level. The amp is none the worse for wear and driver took all of that drama in stride. [<)] Quote Link to comment Share on other sites More sharing options...
michael hurd Posted August 19, 2008 Share Posted August 19, 2008 Ricci: at those ranges you noted compression, cone excursion is low for the amount of power you are dumping into the driver. ( around tuning ) and above 30 hz ( lower excursion range ) Beautiful though... awesome project! Quote Link to comment Share on other sites More sharing options...
Ricci Posted August 20, 2008 Author Share Posted August 20, 2008 Probably a whole host of issues going on there in that last sweep. Line sag, driver heating up, vent compressing, etc. Hey I'm happy with my reference level output from 9hz up though[]. I think with another one of these I could be content[6] Quote Link to comment Share on other sites More sharing options...
darkside Posted August 20, 2008 Share Posted August 20, 2008 Great GoogaMooga! Indeed. Great work and I am completely jealous [] Quote Link to comment Share on other sites More sharing options...
CAS Posted August 24, 2008 Share Posted August 24, 2008 And on the 8th day... God was enjoying a heavenly tasting brown ale, when he looked down from heaven... and saw the XXX subwoofer... and he decided it was good... Book Base, Chapter Subsonic, Verse 10Hz. 1 Quote Link to comment Share on other sites More sharing options...
Ricci Posted September 5, 2008 Author Share Posted September 5, 2008 I've got my 4th driver now.[]. I plan on doing at-least 2 of them sealed. Depending on how that goes I will decide whether to do the third one as a copy of this beast, or get a 5th driver and run 4 sealed and use this one for a different system. I still need to test the last driver that I recieved to make sure it is functional likethe rest. Quote Link to comment Share on other sites More sharing options...
jacksonbart Posted September 5, 2008 Share Posted September 5, 2008 . Quote Link to comment Share on other sites More sharing options...
TheEAR Posted September 5, 2008 Share Posted September 5, 2008 JacksonFive...dayum ,that is one great animation ! WOW is it CGI ? Oh Ricci purchased his RE XXX woofa with 99meters of Xmax ! Woohoo...Moves so much air it can be use in place of a fan,can extinguish a fire ! I have to get myself some RE XXXX driva then...mmm woofa. MMM Quote Link to comment Share on other sites More sharing options...
darkside Posted September 6, 2008 Share Posted September 6, 2008 Ear, you are very strange..... Ricci, saw the vids on YoOtoobe, very impressive. Quote Link to comment Share on other sites More sharing options...
michael hurd Posted September 7, 2008 Share Posted September 7, 2008 " I've got my 4th driver now. " They are like collector cups, you just have to have them all... Quote Link to comment Share on other sites More sharing options...
TheEAR Posted September 8, 2008 Share Posted September 8, 2008 DarkSide, I aint strage, holla at ya playa. [] http://www.youtube.com/watch?v=5_AUP0oA5e4 And... http://www.youtube.com/watch?v=WPIgs-90vuc&feature=related Hilarious Quote Link to comment Share on other sites More sharing options...
Ricci Posted September 8, 2008 Author Share Posted September 8, 2008 I'm trying to corner the market! You guys know how addictive this can be! I have a vision of an IB with 16 NO make that 32 of these[li] powered with 3 phase AETechron amplifiers! Then I will make youtube videos of my house imploding to the music of Barry Manilow![6] Quote Link to comment Share on other sites More sharing options...
darkside Posted September 9, 2008 Share Posted September 9, 2008 Three-phase? How much power would you be looking at getting? And I would love to see that video. Besides, I would glady take some of those woofers off you hands (for storage reasons of course) until you got your house rebuilt [] Quote Link to comment Share on other sites More sharing options...
TheEAR Posted September 9, 2008 Share Posted September 9, 2008 Having many large drivers must sound like a ton of fun. Once you have achieved gallons upon gallons of displacement...it gets boring. The ears give up well before any driver/amp related stress shows up. [|-)] Quote Link to comment Share on other sites More sharing options...
michael hurd Posted September 10, 2008 Share Posted September 10, 2008 Ear, I did a quick calculation and @ resonance, I will have about 15 gallons of displacement... [] Quote Link to comment Share on other sites More sharing options...
Ricci Posted September 10, 2008 Author Share Posted September 10, 2008 At what point do you start measuring cone area in square meters? A true bass system measures it's displacement in cubic feet![6] Arthur I think you may be nearing that point... Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted September 11, 2008 Share Posted September 11, 2008 My sub has abourt 25 liters of displacement, can I get in the party? Quote Link to comment Share on other sites More sharing options...
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