DLHgn Posted July 31, 2017 Report Share Posted July 31, 2017 Tuned in. Always love seeing your testing posts. Very informative. Link to comment Share on other sites More sharing options...
Karkov Posted July 31, 2017 Report Share Posted July 31, 2017 Hell yea, glad I found this thread 2007 Chevy Tahoe (SOLD) 12 ~ FI Audio X series 10" w/BP option 2 ~ DC Audio 5.0K @0.67 3 ~ DC Audio 5.0K @1.0 2 ~ PPI 3 way sets (not installed yet) 1 ~ RF T400-4, 1 ~ RF T600-2, 1 ~ RF T600-4 4 ~ CT Sounds 5.25" Strato comps (rear fill only) 1 ~ XS Power D4800 1 ~ XS Power D3400 8 ~ XS Power XP3000 160 stock alt, Mechman 370 Elite, 185 DC Power 320+ Sq. Ft. Sound Deadener Pioneer AVH-X5500BHS Youtube: https://www.youtube.com/user/knfjdkghjudfhsgkjdhf/videos?sort=dd&view=0&shelf_id=0 Link to comment Share on other sites More sharing options...
Raptorman Posted August 1, 2017 Report Share Posted August 1, 2017 After you test the 32hz rear port then bring it down to the mid to high 20's where people realistically tune rear ports for 6th's. Smaller rear port is better. Tested it in many different cases myself multiple times. Any data is good data though. 1996 GMC Sonoma Four Fi BTL Neo 18's In 2:1 6th Order Bandpass 2 Ampere 5k's @ .5 TEAM FI TEAM #LITHIUMCANTDEMO On 10/20/2013 at 0:37 AM, KillaCam said: Fucking with a Prius driver is like making fun of a disabled kid. Pussies. Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted August 1, 2017 Author Report Share Posted August 1, 2017 28 minutes ago, Raptorman said: After you test the 32hz rear port then bring it down to the mid to high 20's where people realistically tune rear ports for 6th's. Smaller rear port is better. Tested it in many different cases myself multiple times. Any data is good data though. I can do that. I'm glad you commented on what I going to do, I was hoping you would give your input. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
ShadeTreeMechanic Posted August 1, 2017 Report Share Posted August 1, 2017 Tuned in. 91 C350 Centurion conversion ( Four Door One Ton Bronco) 250A Alternator (Second Alternator Coming Soon) G65 AGM Up Front / Two G31 AGM in Back Pioneer 80PRS CT Sounds AT125.2 / CT Sounds 6.5 Strato Pro component Front Stage CT Sounds AT125.2 / Lanzar Pro 8" coax w/compression horn tweeter Rear Fill FSD 5000D 1/2 ohm (SoundQubed 7k Coming Soon) Two HDS315 Four Qubes Each 34hz (Two HDC3.118 and New Box Coming Soon) Link to comment Share on other sites More sharing options...
77-AUDIO Posted August 1, 2017 Report Share Posted August 1, 2017 waiting, lol. tuned in. PPI dbl dinDC Level 31.77cubes net tuned to 33htz.DC audio 2.0kCT Pro Audio 8" in front, 6.5 in rear Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted August 6, 2017 Author Report Share Posted August 6, 2017 I've been chipping away at this project a little bit each day. I've started my harvest season so I don't have much spare time, but I want to keep working on this experiment as I'm able to. I finished construction of the enclosure and two of the port configurations. I still need to do the lower-tuned port configurations. I was able to take some impedance measurements of the 6 sq in and 25 sq in port configurations. Here is the test setup: I took impedance measurements between 20-100 Hz at three different input power levels (2, 21, & 38 volts). Here is the results of the large rear port (25 sq in) configuration: Here is the small rear port (6 sq in) configuration: And here it with the rear port plugged to make it into a 4th order bandpass: I have a theory as to whats going on with the different port sizes, but I'm going to wait until I get all the testing done before I give my interpretation of the results. I'm curious to hear what you folks think is going on based on the impedance measurements. After I get the final two port configurations built and impedance tested I will be doing SPL testing. To do it right I need to do the SPL testing outdoors. By the time I set everything up, do the testing, and then put everything away it turns into a several hour project. I probably won't have time to do that for several weeks, but I'll get it done eventually. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
8ten8 Posted August 6, 2017 Report Share Posted August 6, 2017 Too much port area.. lol Link to comment Share on other sites More sharing options...
WalledSonic Posted August 6, 2017 Report Share Posted August 6, 2017 Im with 8, sort of. haha Im guessing too much port area to play below tuning frequency effectively? Maybe the impedance rise caused by a speaker unloading below tuning is more influential to the circuit than impedance rise caused by choking a small port (high velocity=high drag). They both cause rise, but maybe one is more effective at making rise than the other. ? But it seems that near the tuning frequency, the large port prevents impedance rise. Looking forward to more data! Cool stuff man Chevy Sonic Wall (4) 15's on 10k Build Log https://www.stevemeadedesigns.com/board/topic/209412-2015-chevy-sonicwall4-15s10klithiumlarge-case-hairpin-us-alts/ (4) Fi SP4 15's | (2) Ampere 5Ks | Active! | Arc KS600.2 & KS125.2mini | CDT Silk Domes | Silver Flute 8s | 240Ah JY | US Alts Jeep Wrangler JK (4) 8's in a 4th Order Build Log https://www.stevemeadedesigns.com/board/topic/209841-shadow-2016-jeep-wrangler-jk4th-order4-8sdc-35klarge-case-hairpin-us-alts/ IG @walledsonic Link to comment Share on other sites More sharing options...
Smoove Posted August 7, 2017 Report Share Posted August 7, 2017 thanks for the update. Since I am currently building a 6th. I'm really curious to see how this comes out 2 Team Fi 15's v1 2 DD M5's 970amps of Alt 6th order blowthroughThe truck Blowthrough build : http://www.stevemeadedesigns.com/board/topic/155555-smooves-1996-chevy-ext-cab-c1500-slow-build/The 350z build : http://www.stevemeadedesigns.com/board/topic/170694-smooves-2003-nissan-350z/ My FB page https://www.facebook.com/pages/Smooves-Car-Audio-and-performance/719746144805343 Team Fi Audio http://www.ficaraudio.com/ Link to comment Share on other sites More sharing options...
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