Neo_frog Posted April 17, 2009 Report Share Posted April 17, 2009 Last time I saw subs pulsing like you described, it was because gains were all the way up on the amps, line drivers, and head unit. The amps were perfectly fine, but moved the subs exactly how you were saying. Quote Need an install? Hit me up.[email protected]Got car audio questions? Check here first!Everything you need to know. =]http://www.stevemeadedesigns.com/board/topic/83029-everything-you-need-to-know/ Link to comment Share on other sites More sharing options...
uhoh_45 Posted April 17, 2009 Report Share Posted April 17, 2009 last time i had seen that the rcas were pinched and giving a bad feed Quote R.I.P! (Nov-29-2009) 92 explorer - 4 Atomic Apxx 15s duel .7s - 4rth order bandpass wall -4 powerbass XA-3000D's - 16 8volt batts wired to 16 volts - (9+/9-) runs 0gauge - 152.3 Db @ 29hz BUILD LOG current build 97 chevy lumina4 - 1 Atomic Apx 18 - 6 cube slot port trunk sealed off - 1 powerbass XA-3000D - 2 optima G31s in spare tire18 1 run 1/0 lumina build log Link to comment Share on other sites More sharing options...
no1singh123 Posted April 17, 2009 Report Share Posted April 17, 2009 had the same happen to me but on my T30001bd where the sub just moved up and down very slowly even with gains on low however i just flicked the Infrasonic Filter to the on postion and it stopped may be check the infrasonic filter on yours ?? Quote Link to comment Share on other sites More sharing options...
Boon Posted April 18, 2009 Report Share Posted April 18, 2009 As the others have said, switch out bits to find the faulty part. I'm betting on a bad amp.The older class D designs had a very simple output filter to get rid of the harmonics kicked out by the switching process. If the capacitance of the caps in the filter changes significantly (heat, age etc.), it's common for a resonance to build up in the filter, causing the problem you describe. It's a 2 channel Kenwood, hence I'd be willing to bet it's not Class D Quote 10.x volts fo' life! Link to comment Share on other sites More sharing options...
troy Posted April 18, 2009 Author Report Share Posted April 18, 2009 no most definaely not a class d. Quote retarded build on the way..... 2000 bagged s10 2 hdc3 15s aq2200 aq4x90 stinger/knu wire optima batteries 220 amp alt fosgate hu/mids and highs Link to comment Share on other sites More sharing options...
brewer_brewer Posted April 18, 2009 Report Share Posted April 18, 2009 As the others have said, switch out bits to find the faulty part. I'm betting on a bad amp.The older class D designs had a very simple output filter to get rid of the harmonics kicked out by the switching process. If the capacitance of the caps in the filter changes significantly (heat, age etc.), it's common for a resonance to build up in the filter, causing the problem you describe. no. Quote REFS http://www.caraudioclassifieds.org/forum/itrader.php?u=2026 http://www.stevemeadedesigns.com/board/topic/44535-official-brewer-brewer-feedback/page__p__625998__hl__brewer__fromsearch__1entry625998 "you're not allowing natural selection to work, you're like the guy that invented the seatbelt" Link to comment Share on other sites More sharing options...
brewer_brewer Posted April 18, 2009 Report Share Posted April 18, 2009 ^^^^^^its not a fn pipe man. you can't scrape the reson off and get high. lol. Quote REFS http://www.caraudioclassifieds.org/forum/itrader.php?u=2026 http://www.stevemeadedesigns.com/board/topic/44535-official-brewer-brewer-feedback/page__p__625998__hl__brewer__fromsearch__1entry625998 "you're not allowing natural selection to work, you're like the guy that invented the seatbelt" Link to comment Share on other sites More sharing options...
Boon Posted April 19, 2009 Report Share Posted April 19, 2009 ^^^^^^its not a fn pipe man. you can't scrape the reson off and get high. lol. Uh, he's actually correct. Class D amps use a low-pass filter (aka crossover) after the output section to remove the extremely high frequency PWM carrier signal. Most new ones just use an inductor but some old ones had a bipolar cap to increase the order of the crossover and if it goes faulty you can get oscillation in the filter. That's a form of RESONANCE. RESONance not RESIN. Gah. Quote 10.x volts fo' life! Link to comment Share on other sites More sharing options...
brewer_brewer Posted April 19, 2009 Report Share Posted April 19, 2009 Uh, he's actually correct. Class D amps use a low-pass filter (aka crossover) after the output section to remove the extremely high frequency PWM carrier signal.Most new ones just use an inductor but some old ones had a bipolar cap to increase the order of the crossover and if it goes faulty you can get oscillation in the filter. That's a form of RESONANCE. RESONance not RESIN. Gah. geez. somebody got no since of humor man. Quote REFS http://www.caraudioclassifieds.org/forum/itrader.php?u=2026 http://www.stevemeadedesigns.com/board/topic/44535-official-brewer-brewer-feedback/page__p__625998__hl__brewer__fromsearch__1entry625998 "you're not allowing natural selection to work, you're like the guy that invented the seatbelt" Link to comment Share on other sites More sharing options...
wL<3bass Posted April 19, 2009 Report Share Posted April 19, 2009 geez. somebody got no since of humor man. This guy is looking for answers not comedy.... Quote Vehicle: 1997 S10 Blazer 4dr 4X4 Exterior: Rear End Bagged, Black Grill, Lifted 2" Amplifiers: Rockford Fosgate T8004 & T10001bd Batteries: 2 Stinger SPV35, Kinetik HC2400 Electrical: Big 3, DC Power 290amp Alternator w/ MLA at 15.5v Enclosure: 4.2 ft³ @ 33Hz 84sq.in. of port (20sq.in. per cube) Headunit: Eclipse CD3200 w/ 80G iPod Mids/Highs: Rockford T152s (a-pillars), Rockford T162s (doors) Subwoofers: 1 15" Fi BL Fully Loaded Wire: All 1/0g Kicker Hyperflex My YouTube Videos My Fiberglass A-Pillar Build My "Seamless" Looking Box Build My DD1508 T-Line Bandpass Build "Seamless" w/ Acrylic Windows (for '05 TrailBlazer) My Stealth 8" Fiberglass Build (for '05 TrailBlazer) My Build For A Friend's '08 Cobalt 15" BL Sealed Off From The Trunk My feedback/references... Link to comment Share on other sites More sharing options...
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