Question about Alpine MRD-M1000 Car Audio Amplifier

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2 subs with different ohm loads

I have a 2 ohm sub and a 4 ohm sub and a 1 ohm amp how do i hook it up to get the lowest load with out dropping under 1 ohm right now i have them wired positive to negative and back to the amp its loud but i dont know the ohm load like this

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Are they single voice coil or double?

Posted on Feb 12, 2010

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Wiring subwoofers with different coil resistance is problematic. If they share the same airspace, plan on buying one or more subs in the near future. Because as they share the same power source, having more or less resistance changes the amount of power the subwoofer "sees" in the circuit.

As for your current installation:

if wired in series...
+ on sub (1) to amplifier +
- on same sub (1) to + on sub (2)
- on sub (2) to amplifier
Would result in a Net 6 ohm load

if wired Parallel....
+ on both subs to + on amplifier
- on both subs to - on amplifier
Would result in a net 3 ohm Load.
(The amplifier with higher resistance getting more power however)
Look into getting a matched pair of speakers. While it does not need to be the same manufacturer necessarily, the voicecoils should be identical for both to play at the same level.
No doubt you are experiencing sonic cancellation and musical muddiness when listneng to your current configuration.

Posted on Jan 05, 2009

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1 Answer

What's the best way to hook up 2 Hifonics hdl12d4 subwoofers to a mono amp


Ok, your post has two different models listed. Let's start with something you need to know about your amplifier. Is it one ohm or two ohm stable. This will make a difference. Also, whether your subs are single voicecoil (HFI12s4) or dual voice coil (HDI12d4).

Let's start with the easy scenario. Let's say your amp is two ohm stable and you have two single voice coil subs. It's simple. You go from the positive of the amp to the positive of both subs and the negative of the amp to the negative of both subs. This will provide a 2 ohm load to the amplifier, thus pulling all the power out of it.

Unfortunatley, if you have two dual voice coil subs, you won't be as efficient. You will only have the options of a 4 ohm load or a 1 ohm load.

This is where having a one ohm stable amp would come in handy. If the amp is one ohm stable, hook the positive of the amp to all 4 of the positives on the subs, and hook the negative of the amp to all 4 negatives of the subs. This produces a 1 ohm load.

WARNING!! If you have a 2 ohm stable amp DO NOT use the last wiring scenario. It will fry your amp.

Now, the last is a little trickier. This is for two dual 4 ohm subs. Follow closely. Hook the positive of the amp to one of the positives of each sub. (do the next step to both subs) Go from the negative of the voice coil that you hooked positive from the amp is hooked to, and hook that to the positive of the unused voice coil. Then go from the negative of that voice coil and hook to the negative of the amp. Make sure this is done on both subs. This will give you a 4 ohm load.

Hope this helps

Aug 31, 2011 | Hifonics HFI 12S4 12 DVC Subwoofer 600...

1 Answer

Jl1000/1 amp wiring to 4+4 ohm sub to 2ohm staple.


From your information I am assuming that you have a sub that is dual 4ohm voice coils. Also, I am assuming that you have a single channel amplifier. This is easy to get to a 2 ohm load.

First, go from the positive of the amp to the positive of both voice coils. Then go from the negative of the amp to the negative of both voice coils. You should have two sets of wires running to your sub. This is called a parallel set up and decreases the ohms load of the voice coils to a singe 2 ohms If you have a prefab box, just do the same thing, but instead of the amp, you will be wiring to the cup terminal inside. The amp will be wired regular to the cup terminal on the outside with just one wire.

This is all assuming that you are hooking up only one sub. If you attempt to hook up 2 subs like this to a mono amp, you will drop the load to 1 ohm.

hope this helps

Aug 25, 2011 | Jl Audio 13W7 Car Subwoofer

1 Answer

I have a jl 2 ohm stable amp but my speakers are 4 ohm dual how can I run my speakers to where they both are at full power


Unless you have a 2 channel amp, the best you can hope for is a 4 ohm load. If you hooked both subs up in parallel, you would get a 2 ohm load for each sub. You would then have to wire them in series to equal a 4 ohm load. Even if you wired each sub in series, or a 8 ohm load, then both subs in parallel, you get a 4 ohm load. The other outlandish option is to get 2 more dual 4 ohm subs. Then you can get to a 2 ohm load. Sorry, I'm sure that's not what you wanted to hear.

Aug 14, 2011 | Car Audio & Video

1 Answer

Have a 2000 gmc sierra ext cab pickup and two type R swr-1042d subs and would like to know the best enclosure for the subs to get maximum performance and the best ways to hook up a one channel mono alpine...


it depends on the amp what can it handle. will it do 2 4 or 8 ohm is it 1 ohm stable are the subs dual 2 ohms or dual 4 ohms. 1042s are dual 4 ohm subs so if you wire them both in paralel it will drop both subs into a 2 ohm load for each sub that is pos of one coil to pos of sec coil then pos to pos on amp and same with neg to neg to neg on amp. now if your amp is 1 ohm stable i would do both subs the same way you will get the most power out of the amp. but itll run a littl hot if you dont have adaquate power running to the amp. now i wanna think your alpine amp maybe only 4 ohm stable. i would run both subs like i had said pos to pos then neg to neg now both subs will be a 2 ohm load so what you do to bring it back up to 4 is you run the 2 bridged subs into a series which is pos from one sub to neg of the other sub the remaining pos and neg will run to the amps pos and neg. which will make it into a 4 ohm load. now the last scenereo is your amp is 4 ohm or 2 ohm stable. this is how to wire it to 2 ohms and not 1. take one sub go pos to neg then pos to pos on amp and neg to neg on amp this will make an 8 ohm load with one sub take other sub and do the same neg to pos on sub then pos to pos on amp and neg to neg on amp this will tell amp to run a 2 ohm load. 2 ohms is a good run for these subs if the amp can handle a 2 ohm load. now if you would have given the amp model number i could have looked it up to just give you what you needed but with this short info i gave all possibilities.

Apr 20, 2010 | Alpine Type-R SWR-1042D Car Subwoofer

1 Answer

Have 2 4+4ohm avi sl500 subs how do i wire it to this amp and what setings on this amp alpine mdr m1005 1000watt amp


using these subs will limit you to a 4 oh load to the amp witch will only let the amp produce half of it's power. the lowest ohm load that amp can handle is 2 ohm and the next lowest you can wire the subs is 1 ohm and that will over heat the amp and destroy it. so to answer your question first wire each sub like this diagram shows...
Wiring Option #1
1_4ohmdvc_2ohm.gif
then once both subs are wired this way you wire both positives from each sub to the positive side of the amps speakers terminals and wire each subs neg. to the amps neg speakers terminal. the wire is series parrelle and will present a 4 ohm load witch will be the safest to run with your amp.

Jan 19, 2010 | Alpine MRD-M1005 1000 Watt Mono Amplifier...

1 Answer

I have 1500 kicker amp and 2 15L7 4oh want to hook up


you can't get full power out of it because those subs can be wired series/parrallel to a 1 ohm load or just series to a 4 ohm load and you don't want to put a 1 ohm load on this amp... you need dual 2 ohm subs for this amp... I have the same setup but with dual 2 ohm subs and it is rediculous... you need to buy different subs that are dual 2 ohm or buy an amp that is stable at 1 ohm... you will only get 750 rms out of a kicker 1500.1 at 4 ohms so u will do more harm than good to your subs.

Dec 09, 2009 | Kicker ZX1500.1 Car Audio Amplifier

1 Answer

When i connect both subs(jbl gt 1041d) my amp goes to protection and when i ony hook one up it doesnt go to protection


Hello lilcylentsur,

It sounds like when you connect both subs, the impedance match is too low for the amp to handle. 2 4-ohm DVC subs with both the coils and subs wired in parallel will present a 1-ohm load which is too low for most amps.

The solution is to wire the voice coils in series, (connect a short jumper from one positive to the other negative on each sub). and then wire the remaining terminals to your amp. This will result in a 4-ohm load which most amps can handle.

Here's a "wiring wizard" which allows you to see the ohm loads of different wiring configurations.

Hope this helps.

May 07, 2009 | JBL GT1041D Car Speaker

1 Answer

Subwoofers pop then immediately produce no sound


Sounds like the two subs wired together might be too much of a load on the amp and it is shutting off. Try wiring the two subs in series. That will reduce the load on the amp but will conversely put out less power. Less is better than none though. In any case check your amp to see what the lowest ohm rating it can see, that ohm rating is where you want your subs and if faced with a choice of either going under (lower numerically) or over (higher numerically) GO OVER!-it is much safer.
Here's an article I wrote that can help explain how to wire the subs to the amp.

OHM LOADS, SUB WIRING, OHM RELATED POWER OUTPUT

SERIES SUBWOOFER WIRING
Wire the positive pole from one voice coil (using wire that is as thick or thicker than your wire from amp to sub) to the negative pole of the other voice coil (on the same sub). This will leave you with a positive pole from one voice coil and a negative pole from the other giving you the two leads that will be hooked up to the amplifier or other subs. When wiring in series, the ohms will go up numerically, and the load on the amp will go down. Almost all amplifiers power output will follow this rule, except some amps such as JL Audio's “Ohm matching” D Class amps.

PARALLEL SUBWOOFER WIRING
Wire the positive pole from one voice coil (using wire that is as thick or thicker than your wire from amp to sub) to the positive pole of the other voice coil (on the same sub). Then wire the negative to the negative in the same way. You can then wire to the amp or other subs. When wiring in parallel the ohms will go down numerically, and the load on the amp will go up. Almost all amplifiers power output will follow this rule, except some amps such as JL Audio's “Ohm matching” D Class amps.

MULTIPLE SUBS USING SERIES AND PARALLEL WIRING
In order to match your amplifiers ohm rating you can use parallel and series wiring together, just keep things even for power distribution and to avoid phase issues.
Example: I have two “Type X 12” subs” that have dual 2ohm voice coils and have to match my “Amplifier X” ohm rating of 2ohms mono. In this case, I would wire each subwoofer in series (giving me a 4ohm load), and then wire the two subs in parallel to get my 2ohm mono load. When wiring multiple subs just, treat each sub as a voice coil and wire accordingly.

POWER OUTPUT AND OHM LOADS
For example if “Amplifier X” can make 100watts@8ohms, it would make 200watts@4ohms and 400watts@2ohms. However with every drop in ohms the amplifier is put under more pressure. It starts to create a lot of heat, distortion figures begin to climb, damping rates drop, and some amps even throw power spikes when clipping. SO BE SURE TO CHECK YOUR AMPS RATING AND DO NOT EXCEED IT!

-Dynami

Apr 04, 2009 | Alpine Car Audio & Video

1 Answer

15 cvr 4ohm trying to drop to 1 ohm


Are these Dual Voicecoil Subwoofers? Are there 4 terminals on each sub for wires?

If they are Dual 4 ohm voicecoil subwoofers
- connect both + on subwoofer 1
- connect both - on subwoofer 2
- connect both + on subwoofer 2
- connect both - on subwoofer 1

This will give you a 2 ohm STEREO load.
To get a 1 ohm MONO load...
now connect only one of the + on EACH sub to the + on the amplifier.
and the - on EACH sub to the - on the amplifier.
You now have a 1 ohm mono load.


If your speakers are 4ohm single voicecoils (one pair of terminals) the lowest impedence possible is 2 ohms.

This is wired in the same fashion. Both + on the subwoofers to the + on the amp, and both - on the subwoofers to the - on the amp.

Thanks for using FixYa - a FixYa rating is appreciated for taking the time to answer your FREE question.

Mar 11, 2009 | Kicker CVR12 Car Subwoofer

2 Answers

Hooking up DVC subs


The amp is rated to run a 2 ohm load on each channel. To do this, connect the voice coils of one sub in parallel (tie both "+" on the sub to each other and both "-" on the sub to each other), then connect that sub to one channel of the amp. Repeat this process for the other sub and connect it to the other channel on the amp. The subs will be in stereo and the amp will be outputting it's maximum power.

Mar 09, 2008 | Legacy 2CH 1000W AMP Car Audio Amplifier

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