Help wiring for 4ohms
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70003 Unregistered guest | Hello I have 2 15" Diamond audio subs that are 8 ohm DVC. I need to know how to wire them up to get 4 ohms. I will be hooking it up to my amp 350 watts RMS x 1 bridged output at 4 ohms and is 4-ohm stable in bridged mode. Thanks for any help. |
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Silver Member Username: RovinTrinidad & T... Post Number: 356 Registered: Jul-05 | Same idea as this except your are 8 ohms  |
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70003 Unregistered guest | Thanks,Is that giving me a 4 ohm load or a 2 ohm? |
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Silver Member Username: RovinTrinidad & T... Post Number: 365 Registered: Jul-05 | Yours will = 4ohms http://www.the12volt.com/caraudio/boxcalcs.asp#par |
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70003 Unregistered guest | Thanks for your help I will wire them just like the diagram. |
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70003 Unregistered guest | Ok I had a friend come over and look at my wiring to make sure it was right. He told me that with it wired the way you showed me he thought it would be 2ohm load not 4ohm. So I'm messed up I don't want to put a 2ohm load and mess up my amp up. Looks like if the 4ohm dvc's in the diagram shows 1ohm the 8ohm dvc are going to show 2ohms. Please help. |
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Silver Member Username: RovinTrinidad & T... Post Number: 395 Registered: Jul-05 | Hmmm - Your friend is right ,it works out to be 2ohms ... I was probably seeing DVC 8 ohm & thinking dual SVC 8ohm will = 4ohms, sorry bout that . Been searching the net trying to find a calculator for an 8ohm DVC sub & i can't find any . Never heard of a 8ohm DVC come to think of it & i can't find some evidence to show it can go 4ohms ... Whats the sub & amp model number u have ? Your amp cannot push a 2ohm load ? |
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70003 Unregistered guest | The 2 subs are Diamond audio MC151.8 15" 8 ohm DVC and the amp is a Rockford Fosgate 351s. Thanks for you help. |
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Silver Member Username: JaackdethUnited States Post Number: 592 Registered: Sep-04 | Are you saying those subs are dual 8 ohm or dual 4 ohm? |
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70003 Unregistered guest | They are 8ohm dvc. |
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Silver Member Username: RovinTrinidad & T... Post Number: 401 Registered: Jul-05 | Not even google.com can find those subs but i did find the amp http://www.google.tt/url?sa=t&ct=res&cd=3&url=http%3A//www.eslake.com/item/351S. html&ei=0sMhQ-2CB5z64AGkiNjyAg # 90 watts RMS x 2 at 4 ohms # 175 watts RMS x 2 at 2 ohms # 350 watts RMS x 1 bridged output at 4 ohms . so i now see that u trying to run the amp @ 350x1 @ 40hms , but currently your subs only are getting 90wrms .... Best that u ebay for a good 2 channel amp that can do 2chans x @ 4ohms or get (2) mono amps that give u the power @ 4ohms each . But a single 2 channel amp should be the cheaper alternative . U have any what rms each sub actually needs ??? |
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70003 Unregistered guest | Also if you bridge 8ohm in to the amp will the amp see 8ohms or 4ohms? I thought I read this somewhere. |
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Silver Member Username: JaackdethUnited States Post Number: 593 Registered: Sep-04 | I never heard of dual 8 ohm coils before, single yes, but not dual. |
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70003 Unregistered guest | You can go here and see the manual for the subs http://www.diamondaudio.com/products/pdfs/M3submanual2a5.pdf Here are some more specs TEXTURED CO-POLYMER CONE EXTENDED AIR GAP HI TEMP KAPTON LONG THROW SUSPENSION INTERIOR CHAMBER VENTING INTEGRATED TRIM GASKET RUBBER MAGNET BOOT RMS: 250W IMPEDANCE: 4 OHM PARALLEL SENSITIVITY (dB SPL): 90 REVC: 6 OHM SERIES, 1.5 OHM PARALLEL Qes: 0.37-0.38 Qms: 8.27-8.6 Qts: 0.35-0.36 Vas(L): 187 BL(T.M): 23.9 SERIES, 11.8 PARALLEL Sd(M2): .083 Fs (Hz): 23.6 XMAX (mm): 8 DIAMETER: 15.24" DEPTH: 6.41" |
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Silver Member Username: RovinTrinidad & T... Post Number: 402 Registered: Jul-05 | Thats what i said - but i just thought of something ,that sub MUST be a home audio sub !!! Generally car subs are either 4ohm,2ohm & even 1ohm designed with a lower resistance to be more efficient to work with a car's 12V DC power . My bro's car does have a pair of old 10" Hifonics subs & they are 8ohm SVC & is powered by a 2 channel amp & works fine 6yrs runnning now ...  |
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Silver Member Username: JaackdethUnited States Post Number: 594 Registered: Sep-04 | Ok, do you just have a model number? |
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70003 Unregistered guest | I got them from a guy that was running 4 in his truck and was running them 1ohm together I think. |
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70003 Unregistered guest | Sorry I gave the wrong model number earlier heres the right one M3151 |
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70003 Unregistered guest | Sorry I gave the wrong model number earlier heres the right one M3151 |
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Silver Member Username: RovinTrinidad & T... Post Number: 403 Registered: Jul-05 | 70003 - dude ,forget all that wiring headache trying it to work with that RF amp & just get this - only $210 & may be alot cheaper if u google it ..... http://sonicelectronix.com/item_5192.html & use that RF for some door speakers instead .. |
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Silver Member Username: JaackdethUnited States Post Number: 595 Registered: Sep-04 | Ok, those are single voice coils at 4 ohms, so you won't be able with 2 of them to get to 4 ohms, the best you can do is 8 or 2 ohms. I will include pics. |
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Silver Member Username: JaackdethUnited States Post Number: 596 Registered: Sep-04 |  |
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Silver Member Username: JaackdethUnited States Post Number: 597 Registered: Sep-04 |  |
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70003 Unregistered guest | Will this amp be big enough http://sonicelectronix.com/item_5192.html or do I need bigger? |
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Silver Member Username: RovinTrinidad & T... Post Number: 404 Registered: Jul-05 | So it has been officially determined that each sub is a single voice coils at 4 ohms ??? If so, then that sends us in a different direction ... |
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Silver Member Username: RovinTrinidad & T... Post Number: 407 Registered: Jul-05 | Ok those subs together will = 500wrms @ 2ohms so u pick 1 of these ,a mono amp @ 2ohms http://www.onlinecarstereo.com/CarAudio/ProductDetail.aspx?ProductID=14926 http://www.onlinecarstereo.com/CarAudio/ProductDetail.aspx?ProductID=15169 http://www.onlinecarstereo.com/CarAudio/ProductDetail.aspx?ProductID=13700 http://sonicelectronix.com/item_1491.html http://www.onlinecarstereo.com/CarAudio/ProductDetail.aspx?ProductID=14327 http://www.onlinecarstereo.com/CarAudio/ProductDetail.aspx?ProductID=13901 NOTE - i picked each amp 600wrms @ 2ohms so your amp has plenty headroom & will run cool ..... |
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70003 Unregistered guest | I got another question since my amp is 350 wrms at 4 ohms can I run one sub (which would be 4ohms) with it and buy another amp just like the one it got and run the other sub? I know where I can get another amp just like the one I got cheap. |
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Silver Member Username: RovinTrinidad & T... Post Number: 411 Registered: Jul-05 | Well sure that too . Do consider 2 amps do take more space ,wiring & will draw a lil more current than just 1 - but if u getting it @ a really good deal , do it . |
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