osamio Posted January 14, 2011 Report Share Posted January 14, 2011 I have a 1700 watt amp all the way up on 1 ohm, that would be sq rt(1700)/1 which is 41 amps right? so that means the maximum the amp will draw from the batt/alt is 41 amps right? also is there a way to measure the current being drawn by the car without the aftermarket accessories on, to see how much room i have to work with before i exceed the 140 amp alternator i have? Quote 2009 Cobalt LT Pioneer Headunit 2x Pioneer 6 1/2 (stock amp) 2x Pioneer 1" tweeters (stock amp) 2x Pioneer 6x9 (stock amp 4x Pioneer 6 1/2 Pioneer GM-6400F Soundstream DTR 1700 R.I.P 2x Champion series PRO 12" subs 0 AWG Big 3, Stinger SP1700 battery To come: New or repaired DTR!! Link to comment Share on other sites More sharing options...
EclipseChris Posted January 14, 2011 Report Share Posted January 14, 2011 1700w= (14.4v x amperage) x 0.7 So you need 153amps to get 1700wrms at 14.4v with an amplifier at 70% efficiency. It takes about 40% of cars original alternator output to run. Quote i resolve to be a nicer moderator. Tercel build R.I.P. Eclipse build Old New V-Dub My feedback. Link to comment Share on other sites More sharing options...
osamio Posted January 14, 2011 Author Report Share Posted January 14, 2011 1700w= (14.4v x amperage) x 0.7 So you need 153amps to get 1700wrms at 14.4v with an amplifier at 70% efficiency. It takes about 40% of cars original alternator output to run. Maybe mathematically that's right, but it doesn't seem right because this amp's recommended fuse is 150amp. says so in the manual. so it can't pull 153 amps. if i work out your equation, 1700 = (14.4 x amps) x 0.7 or 2428/14.4 = 169 amps... that's WAY over what i would expect an amp of this size to draw, and it's more than the fuse it uses... so what am i missing.. Quote 2009 Cobalt LT Pioneer Headunit 2x Pioneer 6 1/2 (stock amp) 2x Pioneer 1" tweeters (stock amp) 2x Pioneer 6x9 (stock amp 4x Pioneer 6 1/2 Pioneer GM-6400F Soundstream DTR 1700 R.I.P 2x Champion series PRO 12" subs 0 AWG Big 3, Stinger SP1700 battery To come: New or repaired DTR!! Link to comment Share on other sites More sharing options...
skittlesRgood Posted January 14, 2011 Report Share Posted January 14, 2011 (edited) eclipse is correct. its ohms law. remember that music is dynamic and fuses dont pop as soon as they see over their rating. a 150amp fuse could take 200amps for about 5-10 min. there is also the posibility that the amp is over rated and doesnt really do that much power. as an example, my amps could be drawing 205amps but i have 160amps of fusing on each amp. Edited January 14, 2011 by skittlesRgood Quote If I answered you in a well mannered, informative way, you asked a good question or had a good attitude. If I was an asshole, you asked a stupid question or you had a fucktard attitude... or I was in a bad mood. Team BassickHU: Pioneer AVIC Z110Front: Peerless SLS 6.5", Peerless HDS 4", Rainbow tweeter - running activeAmp: JL HD600/4 and DC 4 channel (bridged to midbass)Processor: JBL MS-8Subs: 2x 12" AA MayhemsAmp: DC 3kElectrical: DC power 270xp alt. 1/0 big 4. XSpower D3400 and six D680s. http://www.stevemeadedesigns.com/board/topic/121795-29-update-the-buick-is-getting-a-rebuild/ Top career scores: DBdrag 151.7 MECA SQ 82.25My SOTM build Yeah. im pretty sure they dont warranty retarded people. Link to comment Share on other sites More sharing options...
EclipseChris Posted January 14, 2011 Report Share Posted January 14, 2011 Maybe mathematically that's right, but it doesn't seem right because this amp's recommended fuse is 150amp. says so in the manual. so it can't pull 153 amps. if i work out your equation, 1700 = (14.4 x amps) x 0.7 or 2428/14.4 = 169 amps... that's WAY over what i would expect an amp of this size to draw, and it's more than the fuse it uses... so what am i missing.. First a quick lesson on fuses, a fuse will NOT blow when it gets rated amperage unless it gets it constant for about 20-30 seconds. Now, the way i did the equation it came out to 153 and some change. 14.4 times 153 times .7 equals 1500 and change which is as close as you'll get with all the rounding. Bottom line is IF your actually getting 1700rms then you are over drawing your alternator at full tilt. Quote i resolve to be a nicer moderator. Tercel build R.I.P. Eclipse build Old New V-Dub My feedback. Link to comment Share on other sites More sharing options...
osamio Posted January 14, 2011 Author Report Share Posted January 14, 2011 Didn't know MAXI fuses were slow blow. And Soundstream amps are CEA compliant. Sooo my next question would be what are my options? alternator upgrade? i have 0 AWG big three. would adding a battery help? or is the only option upgrading the alt? Quote 2009 Cobalt LT Pioneer Headunit 2x Pioneer 6 1/2 (stock amp) 2x Pioneer 1" tweeters (stock amp) 2x Pioneer 6x9 (stock amp 4x Pioneer 6 1/2 Pioneer GM-6400F Soundstream DTR 1700 R.I.P 2x Champion series PRO 12" subs 0 AWG Big 3, Stinger SP1700 battery To come: New or repaired DTR!! Link to comment Share on other sites More sharing options...
EclipseChris Posted January 15, 2011 Report Share Posted January 15, 2011 Didn't know MAXI fuses were slow blow. And Soundstream amps are CEA compliant. Sooo my next question would be what are my options? alternator upgrade? i have 0 AWG big three. would adding a battery help? or is the only option upgrading the alt? ALL fuses act the same. None are "slow blow" they are just metal at a certain thickness designed to allow so much current flow. You can add batteries or you can up the alt status. Get a bigger one or get another one. I recommend get another battery or two and get a volt meter and just don't let it dip past 12v. Quote i resolve to be a nicer moderator. Tercel build R.I.P. Eclipse build Old New V-Dub My feedback. Link to comment Share on other sites More sharing options...
osamio Posted January 15, 2011 Author Report Share Posted January 15, 2011 Didn't know MAXI fuses were slow blow. And Soundstream amps are CEA compliant. Sooo my next question would be what are my options? alternator upgrade? i have 0 AWG big three. would adding a battery help? or is the only option upgrading the alt? ALL fuses act the same. None are "slow blow" they are just metal at a certain thickness designed to allow so much current flow. You can add batteries or you can up the alt status. Get a bigger one or get another one. I recommend get another battery or two and get a volt meter and just don't let it dip past 12v. There are slow blow fuses as well as quick blow fuses. Apparently not for use in cars. But if you look around there are instant blow maxi fuses as well as slow blow. it's dependent on the length, thickness, and type of metal used in the filament. It makes sense that the ones included for amplifiers are slow blow however. that's beside the point. So adding another battery should be enough to cover it without an alt upgrade? Quote 2009 Cobalt LT Pioneer Headunit 2x Pioneer 6 1/2 (stock amp) 2x Pioneer 1" tweeters (stock amp) 2x Pioneer 6x9 (stock amp 4x Pioneer 6 1/2 Pioneer GM-6400F Soundstream DTR 1700 R.I.P 2x Champion series PRO 12" subs 0 AWG Big 3, Stinger SP1700 battery To come: New or repaired DTR!! Link to comment Share on other sites More sharing options...
chewie Posted January 15, 2011 Report Share Posted January 15, 2011 Do the big three upgrade and get yourself one GOOD main battery.. youll be set. Quote 91 dodge colt gt.. 4 custom t600 15s audioque 3500d.1 tuned to 25 hz... stay tuned. blazer stroker 15 brutus bxi2006d terrible voltage drop 145.4@38HZ... SEALED LEGAL Aim: chewieft09 www.t3audio.com carpe diez nuts !! my house is louder than your car... Link to comment Share on other sites More sharing options...
fritosaregood Posted January 15, 2011 Report Share Posted January 15, 2011 Do the big three upgrade and get yourself one GOOD main battery.. youll be set. This Big 3 will do wonders, Then a good battery under the hood. Quote seller feedback: http://www.stevemeadedesigns.com/board/ind...showtopic=61719 http://www.stevemeadedesigns.com/board/ind...showtopic=68281 build log: http://www.stevemeadedesigns.com/board/index.php?showtopic=44800 Gf's build: http://www.stevemeadedesigns.com/board/topic/54346-kickergirls-camaro-new-box-pg-5/#entry753970 Link to comment Share on other sites More sharing options...
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