dkahns51 Posted April 21, 2012 Report Share Posted April 21, 2012 What are my options for the final OHM with 3 D4 subs on a MONO amplifier? Quote **Clicky>>My 2009 Subaru Impreza Outback Sport Buildlog<<Clicky** I'm messing up 98% of the time Link to comment Share on other sites More sharing options...
Cashdollar2009 Posted April 21, 2012 Report Share Posted April 21, 2012 Each sub parallel down to 2, then all three paralleled down to 0.67 ohms. Each sub parallel down to 2, then all three series up to 6 ohms. Each sub series up to 4, then all three parallel down to 2.67 ohms. Quote On 6/30/2011 at 1:11 AM, 'Ray' said: Acoustical energy is free. Electrical energy is not. Link to comment Share on other sites More sharing options...
Cashdollar2009 Posted April 21, 2012 Report Share Posted April 21, 2012 I wouldn't reccomend 0.67 ohms for a daily application. With your configuration, 2.67 would be the lowest impedance possible that wouldn't void any warranty or risk general equipment failure. Quote On 6/30/2011 at 1:11 AM, 'Ray' said: Acoustical energy is free. Electrical energy is not. Link to comment Share on other sites More sharing options...
Cashdollar2009 Posted April 21, 2012 Report Share Posted April 21, 2012 I don't know how to edit on mobile, so I'll make one more post. Although three 12"s has more cone area, you will see more than twice the power on only two subwoofers because you would be able to obtain a final load of 1-ohm. Depending on the subwoofers, you may be better selling the third and investing in wire to upgrade your big three or look into a secondary battery to maintain a higher operating voltage as you would be wired down to 1-ohm. So you're really looking at theoretically 33% more cone area vs. 150% more power. I vote power. Just my $0.02. Quote On 6/30/2011 at 1:11 AM, 'Ray' said: Acoustical energy is free. Electrical energy is not. Link to comment Share on other sites More sharing options...
dkahns51 Posted April 21, 2012 Author Report Share Posted April 21, 2012 I already got the big 3 done with o gauge, upgraded battery up front and 2nd battery in back as well as a 250 amp alternator. With a Rockford t2500 bd-cp would I be able to go with the .67 ohm or should I stay at 3.67? Quote **Clicky>>My 2009 Subaru Impreza Outback Sport Buildlog<<Clicky** I'm messing up 98% of the time Link to comment Share on other sites More sharing options...
Cashdollar2009 Posted April 21, 2012 Report Share Posted April 21, 2012 Those constant power series amplifiers are nice. I'm planning to run a pair here soon on some DC XL's. As far as your options, if you insist on running all three, I'd definitely say to stick with the 2.67-ohm load. Luckily in your case you have the "constant power" series amplifier, therefore you'll still probably see a ballpark rated 2400-2700wrms at that load. If it were basically any other monoblock, you'd see your power cut substantially going from 1-ohm to 2.67-ohms. What kind of subwoofers are you looking to run? Quote On 6/30/2011 at 1:11 AM, 'Ray' said: Acoustical energy is free. Electrical energy is not. Link to comment Share on other sites More sharing options...
Toby Ratcliffe Posted April 21, 2012 Report Share Posted April 21, 2012 (edited) That amp is 1 ohm stable. You might be able to get away with .67 ohms, but I would base that decision based on the power requirements of the subs as well. You are going to get about 1500 watts at 2.67 ohms, and somewhere around 2500 watts at .67. If your subs are looking for 500 watts RMS, stay safe with 2.67. If they can do 1000 Watts RMS, then I would try .67. NVM, just saw that it was the CP version. Edited April 21, 2012 by Toby Ratcliffe Quote Link to comment Share on other sites More sharing options...
dkahns51 Posted April 21, 2012 Author Report Share Posted April 21, 2012 I was thinking of adding a 3rd SXX 15" d4 Re audio sub... but being that i can only go 42" wide and 29" tall i dont think i can fit 3 now. Im going to look into it more cus im going out of town and i will have alot of spare time on my hands :/ Quote **Clicky>>My 2009 Subaru Impreza Outback Sport Buildlog<<Clicky** I'm messing up 98% of the time Link to comment Share on other sites More sharing options...
BEEMDUB Posted April 21, 2012 Report Share Posted April 21, 2012 use this as a good reference also Quote Link to comment Share on other sites More sharing options...
bkolfo4 Posted April 22, 2012 Report Share Posted April 22, 2012 (edited) Each sub series up to 4, then all three parallel down to 2.67 ohms. This is wrong. (3) 4 ohm drivers in parallel is 1.33 ohms Edit - but now I see they are dual 4, so that would be: "Each sub series up to 8, then all three parallel down to 2.67 ohms" Edited April 22, 2012 by bkolfo4 Quote Current system: 1997 Blazer - (4) Customer Fi NEO subs with (8) American Bass Elite 2800.1s Previous systems: 2000 Suburban - (4) BTL 15's and (4) IA 40.1's = 157.7 dB at 37 Hz. 1992 Astro Van - (6) BTL 15's and (6) IA 40.1's = 159.7 dB at 43 Hz. Link to comment Share on other sites More sharing options...
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