Gutta Trash Posted March 3, 2017 Report Share Posted March 3, 2017 Alright guys, so my boy Chauncy did a full tune for me, meter,clamps, scope, the works. I am currently running a AB Phantom 4k 2 15's wired to 1ohm. After all the tuning and testing my heart was broken. I'm doing a 145, BUT after box rise the amp is seeing 5.1 Ohms, meaning my subs are only seeing about 280 Watts each and are rated for 1100 each. Full potential not even close to being recognized, I have to change this. So I am going to piss everyone off and go with a Brazilian amplifier, this is where I need help. I would like to get an 8k but from what I've researched a 5k will get me real close to giving the subs full RMS power. I'm looking at the Stetsom 5k's there is a model that is 1 Ohm stable and 1 that is 2 Ohm stable. At 4 Ohms the 2 Ohm model actually makes more power, but would I have an issue with it only being 2 Ohm stable given that my subs are wired to 1. Will the amplifier actually ever see below 2 say at low volume etc..? Thanks in advance gents. On 4/20/2010 at 10:06 PM, 'cc_audio' said: Guys are just like girls, once you've had 18 inches you don't go back. 2004 GMC Yukon XL Pioneer AVH-X4700BS 13 band EQ Sub Amp- (2) PPI 5000BD.1 (2) Re SXX 15's 8 cu. ft. box tuned to 32 Hz (4) 6.5 Bose Mids (2) 1" Bose Tweets (2) 1.5" Bose Tweets (1) JY 80 AH w/ new JY busses (1) Duracell 750 up front Apex Alternators 270 A.C. Delco 160 alternato Link to comment Share on other sites More sharing options...
Jessica Posted March 3, 2017 Report Share Posted March 3, 2017 All praise the one true God Term Lab. Good luck. I would try m9ving the box and stuff like that before buying gear. That's just me Rest in peace, walled 87 accord build log 03' Corolla build with AA Mayhem inside. My super random youtube channel and terrible camera work. Wiring comparison by CaptainzPlanetz Wire and fuse guide by Guest SyKo13 Link to comment Share on other sites More sharing options...
nkrell11 Posted March 3, 2017 Report Share Posted March 3, 2017 Wiring most brazilians below their minimum rated impedance is a bad idea. Some people will tell you with enough electrical you can cheat a little and wire a little below but I definitely wouldn't wire a 2 ohm brazilian to 1 ohm. No matter what you're always going to fight rise. I'd try a new box that's more efficient or do what strangeduck suggested before swapping amps. Current Build: 02 Jeep Grand Cherokee Build (AKA Project Silent Night) Mechman, Neo Slow Link to comment Share on other sites More sharing options...
ShadeTreeMechanic Posted March 3, 2017 Report Share Posted March 3, 2017 I would get a second amp like the one you have and run one on each sub. 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...
Jessica Posted March 3, 2017 Report Share Posted March 3, 2017 34 minutes ago, ShadeTreeMechanic said: I would get a second amp like the one you have and run one on each sub. can you show me math on how that would help? Rest in peace, walled 87 accord build log 03' Corolla build with AA Mayhem inside. My super random youtube channel and terrible camera work. Wiring comparison by CaptainzPlanetz Wire and fuse guide by Guest SyKo13 Link to comment Share on other sites More sharing options...
ShadeTreeMechanic Posted March 3, 2017 Report Share Posted March 3, 2017 I was thinking that two 4k amps at .5 ohm each would do something. Edit: I guess it depends on what the coils are. 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...
notorious97200 Posted March 6, 2017 Report Share Posted March 6, 2017 I would never wire a brazilian amp below its nominal/minimal impedance. Work on your box, move it, try to play inverted, build another box, play with it...Before buying any equipment. 145 dB on 500 watts is a good score ! Sometimes a different style of wiring can help. Good luck, you're on the right track ! black BMW X1 2.0 l 192 hp OEM head unit, Amplifiers : Audison AP 8.9 amp with integrated DSP and Ampere Audio 1200. Focal ES 100 K in front doors, and Dayton RS 180 for midbass under the front seats. 2 SSA DEMONS 10" subs, in a 2.6 ft3 ported box. SecondSkin Damplifier on front doors, and Luxury Liner Pro for the cargo area. Link to comment Share on other sites More sharing options...
Keith77 Posted March 6, 2017 Report Share Posted March 6, 2017 Use lag bolts to keep the box from rising Jk... Carry on Thats cool. Im way too old to be upset by shit like that. Your name is winston. Your own parents hated you even before you were born. My penis is bigger than your penis I'm far from loud and my roof/headliner flaps around like Adam's ass on a windy day. I think it depends more on the structure of the vehicle. Link to comment Share on other sites More sharing options...
Wicks Posted March 6, 2017 Report Share Posted March 6, 2017 Just because you measured an "impedance rise" of ~5ohms doesn't mean that you are under-powering your subs throughout the whole music spectrum. I assume your 145 score was just at one frequency? Which just happens to be your peak. Depending on your box, your impedance at other frequency's could be drastically different. Here is an impedance sweep of my box, for reference: My peak frequency is around 41-45Hz so you can see from the chart, my impedance there is similar to yours at about 5ohms or so. But down towards my tuning frequency (32-33Hz) my impedance is much lower at 1.5ohms. At other places its even more drastic. So it wouldn't hurt to sweep your whole impedance to truly get an idea of what it looks like, not just at one frequency. This post sent with 100% recycled electrons. 2004 BMW M3Mechman 280A 2 - XS Power XP30001 - XS Power D375 500F of Maxwell SuperCaps (soon to be 1000F) iPadMini2Dash mounted O-scopeAudison bitOne (Remote DRC MP) Highs Amp - PPI Art A404 Hertz HSK130 (HSK165 waiting...) DC Audio DC9.0K 2- DC Audio XL12m2LEGAL - 147.3dB @ 41Hz OUTLAW - 150.2dB @ 45Hz OUTLAW - 145.7dB @ 30Hz JUNE 2014 SOTM WINNER 2014 COLORADO PEOPLE'S CHOICE WINNER SOTM BUILD:http://www.stevemeadedesigns.com/board/topic/141656-wicks-e46-m3-build-bass-turbo-button-and-a-big-new-addition/page-68#entry2802026 Link to comment Share on other sites More sharing options...
Kyblack76 Posted March 6, 2017 Report Share Posted March 6, 2017 25 minutes ago, Wicks said: Just because you measured an "impedance rise" of ~5ohms doesn't mean that you are under-powering your subs throughout the whole music spectrum. I assume your 145 score was just at one frequency? Which just happens to be your peak. Depending on your box, your impedance at other frequency's could be drastically different. Here is an impedance sweep of my box, for reference: My peak frequency is around 41-45Hz so you can see from the chart, my impedance there is similar to yours at about 5ohms or so. But down towards my tuning frequency (32-33Hz) my impedance is much lower at 1.5ohms. At other places its even more drastic. So it wouldn't hurt to sweep your whole impedance to truly get an idea of what it looks like, not just at one frequency. ^^^^^^ This. I was gonna say the same. Your not rising to 5 and staying there when playing music. That is where you took the one measurement. SMD SUPER SELLER The Burban Build Blazer Build sold Acura trunk build sold Link to comment Share on other sites More sharing options...
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