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04-03-2007, 08:26 PM
what kind of sub?
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04-03-2007, 08:33 PM
The one in slim's for sale ad I assume.
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04-04-2007, 03:00 PM
if it is a 4 ohm sub just bridge the amp and you will be running at two ohms.
if the sub is a duel voice coil then you have may have to run the coils in series then bridge the amp...all depends on what you got.... THE ANGRY PEAR IS BACK
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04-05-2007, 08:18 AM
Ok, thanks...I'll ask slim on saturday how many ohms the sub is.
I think I will google how to "bridge" amps or run "series" cause I don't think I'm comfortable in that area yet. 
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04-05-2007, 10:13 AM
it is a 4 ohmer.
technicly John is right, but thats not how they really do it. if your amp is 500w @ 4 ohm and 750 @ 2 ohm, you hook a 4 up to it, your gonna get 500. Even tho "internally" the amp is seeing 2 ohm. thats is why most amps have a problem running 2 ohms ( pair of 4 ohms ). altho they are getting better at making the amps play at 2 with out problems. im running 80 watts to it, and it does just fine for out put. not gonna make ears bleed, but enough to get a ticket i spoze lol.
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04-05-2007, 01:32 PM
I have a RF punch single channel amp, 100W RMS at 4ohms, 200W RMS at 2ohms....I was hoping to put 200W to that JL sub.
How do I bridge a single channel amp? that's NOT possible right? you need 2 channels to bridge them together?
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04-05-2007, 02:14 PM
yea no bridging on a mono amp.
this sub is real efficient... doubling you power is only gonna get you 3db louder... and at a loss of dampning factor.
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04-05-2007, 04:52 PM
well ive got my box built just need to seal,carpet and wire it up. ill get some pics up later pre carpeted
Racing from a roll is like beating off, it may be fun but its not the real thing. Quote:
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05-10-2007, 12:00 AM
Anyone have feedback on Kenwood 1200 watt 12 inch subs? Heard some today at best buy, and compared to the others they had, the sounded the best.
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05-10-2007, 12:19 AM
Quote:
thats theoretical you need double the power or double the area (cone size) to see a gain of 3bd's. it als takes 3db's for hte human ear to notice a difference and yes you can bridge ANY 2 channel amp. heres how to do it on an amp that does not support bridging, you can even do it with 2 amps if you want in order to unders tand how an amp works you need to know that it is a push pull AC current, all an amp does is take DC and convert it to AC. you wnat 1 amp to push and the other amp to pull (or channel) so to do it you need to run one of the maps out of phase. basically do this take 1 RCA and put it to one amp then take the other side of the RCA and run it to a crossover in FULL mode with it out of phase, this giving 1 amp a in phase signal and the other amop an out of phase signal then you take the + of the first amp and wire it to the + of the sub, then you take the - of the first amp and hook it up to the - of the other amp, then you take the positive of the other amp and put it to the - of the sub. the reason that you need to put the - of the first ampt ot he - of the second amp is because both amps need to share the same ground. FYI i have extensive knowledge in car audio, i used to compete heavily in MECA and was sponsored by a very well know company and have several trophoies to prove it. theres not much about car stereo that i dont know  Violator 9.5 Jammin CRT Kyosho Inferno GT HPI MT
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05-10-2007, 12:23 AM
Quote:
wht are you looking for SQ or SPL or SQL? there is s differnet types of subs, what are you looking for? FYI the kenwoods cant handle 1200 watts at .01 THD, they are most likely rated 1200 peak at .3 THD (THD= total hormonic distortion) the heat that 1200 watts produces cannot be disipitated by the pole vent that kenwood subs use, you will melt the coil to the pole vent. Violator 9.5 Jammin CRT Kyosho Inferno GT HPI MT
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05-10-2007, 12:33 AM
Quote:
you have to also remember are they running stereo or mono, it makes a huge difference. 4 ohm mono is not the same as 4 ohm stereo. internally the amp seeis what the final load is, and that is determined by the subs ohms. also to let you know a 4 ohm sub is not always 4 ohms, most likely it is DMM'd at about 3.4-3.7 and also when a sub moves from one excursion to the other excursion the impedence lowers so a 4 ohm sub in peak excursion will make the amp see about a 1.5ohm load, that is the real reason alot of amps have a hard time with 2 ohms, because during peak excursion it is oerating at less then 1 ohms. i have actually run 1/8 ohms load on MMATTS amps and for the love of god do not thing a capacitor will stop your lights from dimming, if your lights are dimming you have other electrical issues going on. Anyone who knows how a capaictor works will tell you that in car audio a capitor is best suited to filter out AC ripple form getting into the amps power supply. Violator 9.5 Jammin CRT Kyosho Inferno GT HPI MT
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