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Car Forum / Driving, Maintenance, Tuning / Car Audio / May 2004Sub Impedance - HELP ME =(
OK, I was just about to buy my subs and an amp. 2 Infinity Kappa 10" DVCs and a Rockford Fosgate Punch P5002 amp I was reading JL's wiring tutorial at http://jlaudio.com/tutorials/wiring/index.html and just got myself all confused... Infinity's webpage says that these subs are dual-4 ohm speakers and that they will be either 2 or 8 ohm's depending on how they are connected. Looking at JL's wiring diagrams, The one for a single DVC driver with voice coils in series says Dual 4 ohm subwoofer = 8 ohms. OK that makes sense =) The one for a single DVC driver with voice coils in parallel says Dual 4 ohm subwoofer = 2 ohms. OK that makes sense too =) Here's the problem: JL says 2 DVC drivers with the voice coils on each driver in series and the drivers themselves wired in parallel for two dual 4 ohm subwoofers = 4 ohms. ????? How is this? Infinity's page says they will be either 2 or 8 ohms when connected. Does JL mean that if you wired them this series/paralled way into just one channel that the amp would see 4 ohms? Or would the amp see 4 ohms at each channel. If you'll take a look at their series/paralled diagram for two DVC drivers it appears that they are both wired into the same channel as if they are bridging the amp I think. I really need help! I don't want to buy the wrong amp for these speakers. Anyone know how to wire up these two 10" Infinity DVC subs to an amp so that each sub gets 250w RMS. Is the RF P5002 the wrong amp? Which should I get. Grrrrr I have a headache now lol Thanks again! > OK, I was just about to buy my subs and an amp. > 2 Infinity Kappa 10" DVCs [quoted text clipped - 31 lines] > > Thanks again! Sub 1 Sub 2 4 4 4 4 ^^^^^ ^^^^^ ^^^^^ ^^^^^ | | | | | | | | | +--+ | | +--+ | | | | | | +------------(----------+ | | | +-----------------------+ | | | | | | <------ 4 Ohms -----> | In other words you hook two DVC 4 ohm coils together and they eac become a 2 ohm driver .. If you hook (2) 2ohm drivers together i parallel they become a 4 ohm mono load .. get it ? If you hooked bot of um together in series ; the same as the voice coils ; you would ge a 1 ohm mono load . -- Mister_ > In other words you hook two DVC 4 ohm coils together and they each > become a 2 ohm driver .. If you hook (2) 2ohm drivers together in > parallel they become a 4 ohm mono load .. get it ? If you hooked both > of um together in series ; the same as the voice coils ; you would get > a 1 ohm mono load .. 2-2ohm drivers in parallel is a total of 1ohm. 2-2ohm drivers in series is a total of 4ohm.  Signaturecyrus *coughcasaucedoprodigynetcough* > > In other words you hook two DVC 4 ohm coils together and they each > > become a 2 ohm driver .. If you hook (2) 2ohm drivers together in [quoted text clipped - 5 lines] > > 2-2ohm drivers in series is a total of 4ohm. So you are saying that the 4 ohms that JL shows IS for a mono load right? That RF amp is a 2 channel amp. I dont want to run it in mono mode. I want both of the subs to be on there own channel. So can I wire these subs to this amp and have the amp see 2 ohms from each speaker or not since each DVC sub becomes a 2 ohm driver? i woudl do this by NOT connecting the 2 sub together? Daniel OK, been reading all the threads I can on this subject. Can someone tell me for sure that I got this right so I can go buy the darned things? ;p RF P5002 puts out: 250w x 2 RMS @ 2 ohm 500w x 1 RMS @ 4 ohm If I wire two dual 4-ohm DVC subs in series/parallel this results in a 4 ohm load. I then bridge the 2 channel amp down to mono and connect the 2 subs. The amp sees a 4 ohm mono load so each speaker will be getting 250w RMS??? Whew... Thanks again! Daniel Dan , you ought to look and see if you can find a 1 ohm Class D mono am . It will be more efficient for bass and use less power . -- Mister_ Yep, you've got it. You can either make each sub into a 2-ohm load and leave the amp in stereo mode, and each sub will get 250 Watts. Or, you can series/parallel the subs together to make a single 4-ohm load, and bridge the amp to a single 500W channel. This would give each sub 250W as well. It's six of one or a half-dozen of the other, but I'd bridge the amp to mono and wire the subs as a single 4-ohm load if it were my system. Scott Gardner >OK, been reading all the threads I can on this subject. Can someone >tell me for sure that I got this right so I can go buy the darned [quoted text clipped - 11 lines] >Thanks again! >Daniel > Yep, you've got it. You can either make each sub into a 2-ohm load > and leave the amp in stereo mode, and each sub will get 250 Watts. [quoted text clipped - 6 lines] > > Scott Gardner Now why do you say that Scott? I read (and I think it was one of your posts) that bridging the amp causes it to work harder and run hotter. I'm confused as to why you wouldn't go with the stero configuration. WOW I can't believe I understand this stuff after looking at it all day. You guys rock. Thanks >> Yep, you've got it. You can either make each sub into a 2-ohm load >> and leave the amp in stereo mode, and each sub will get 250 Watts. [quoted text clipped - 13 lines] >WOW I can't believe I understand this stuff after looking at it all >day. You guys rock. Thanks How "hard" the amp works is a function of the power delivered by the amp. If you get 500W from bridging it to a single 4-ohm load, or you get 250W each from two 2-ohm loads, the strain on the amp is the same. The reason is that if you leave it in stereo mode, you're giving each channel of the amp a 2-ohm load. When you bridge it to mono, you're giving the single channel a 4-ohm load. The higher voltage when you bridge the amp is offset by the fact that a 4-ohm load is less strenuous for the amp than a 2-ohm load. The increase in voltage is offset by the decrease in current, so the net power (and strain on the amp) is the same. When I said that bridging puts stress on an amp, I was comparing stereo mode using two 4-ohm loads to a mono bridge using a single 4-ohm load. Since you're talking about two 2-ohm load versus a single 4-ohm load, the overall stress on the amp (and power produced by the amp) will be the same either way. Scott Gardner What I mean is, this amp is rated at 250 watts x 2 @ 2 ohms RMS Is there a way to hook up these two dual 4-ohm DVC drivers so each of them gets 250 watts? Thanks guys > What I mean is, this amp is rated at 250 watts x 2 @ 2 ohms RMS > Is there a way to hook up these two dual 4-ohm DVC drivers so each of > them gets 250 watts? > > Thanks guys I think you got it down now, 2 4 ohm voicecoils in parallel, each sub = 2 ohms 2 channel amp, 2 ohms each channel, 250 watts x 2 This setup will draw your 250 watts in each channel. |
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