what would you choose?

Home / the12volt's Install Bay / Car Audio / what would you choose? (

Topic Closed)

Welcome Guest :)

Members

< Prev Page Next Page > < Prev Topic Next Topic >

bradinar

Member - Posts: 33

Joined: April 26, 2009

Location: Arkansas, United States

Posted: May 28, 2009 at 3:43 PM / IP Logged

Out of all the amps you've mentioned I would take a used alpine over the rest anyday. I have owned several alpine amps over the years and they have all been great. One look on ebay will give you evidence to my claim. There are lots of 10+ year old alpine V12 series amps on there that are still 100% functional. Boss, Ultimate, MTX, not so much. Also you can bet that the ratings on that alpine are pretty close to accurate for the given voltage those other brands are almost certianly overrated. The first amp I ever owned was an old solid black alpine and never had an issue with it.

skateit_12

Member - Posts: 34

Joined: April 22, 2009

Location: Ontario, Canada

Posted: May 28, 2009 at 6:20 PM / IP Logged

So finding out that my sub is dual 2 ohm voice coils has really screwed my calculations up. Should I run it at 1 ohm or 4 ohms? The amp is 1000w @ 2 ohm and 600w @ 4 ohm but there is no mention of 1 ohm. Im not sure whether to wire it for 1 ohm or 4?

soundnsecurity

Gold - Posts: 2,711

This member has made a donation to the12volt.com. Click here for more info.

Joined: November 10, 2008

Location: Louisiana, United States

Posted: May 28, 2009 at 7:45 PM / IP Logged

if they dont give you a 1 ohm rating then i wouldn't feel safe running it at 1 ohm. i would series it for a 4 ohm load to get the 600 watts.

Search for other posts by soundnsecurity

skateit_12

Member - Posts: 34

Joined: April 22, 2009

Location: Ontario, Canada

Posted: May 28, 2009 at 7:51 PM / IP Logged

There is absolutely no way to run a 2 ohm dvc on a mono amp at 2 ohms?

soundnsecurity

Gold - Posts: 2,711

Joined: November 10, 2008

Location: Louisiana, United States

Posted: May 28, 2009 at 8:10 PM / IP Logged

you can just run one coil of the sub woofer, but it will decrease the rms rating of your sub by 20% (i think) and you would probably blow that sub by running 1000W to 1 coil

joch1314

Copper - Posts: 301

Joined: March 25, 2008

Location: Texas, United States

Posted: May 28, 2009 at 8:28 PM / IP Logged

Not with wiring both voice coils. you'd either get one ohm (parallel) or 4 ohms (series). just wire it for four ohms and hook it up to your amp. the db drop from 2 ohms to 4 ohms is not really too noticeable for the human ear....If you're not competing you should be good!

...half of the truth can be worse than a lie. <----Roger Russell said that..

soundcontrol

Member - Posts: 37

Joined: May 18, 2009

Location: Arkansas, United States

Posted: May 28, 2009 at 8:37 PM / IP Logged

If you have a meter you may want to double check the sub wired in parallel and in series and see what it actually meters out at.

The reason is, most subs will be rated at dual 4 or dual 2ohm subs and when you read the RE: for the sub it shows to be really close to its actual ratingbut not exact.

For example JL audio 13w6v2 dual 4ohm from the JL website

Its dual 4ohms but when you read the specs

RE: 6.50 Ohms *** with an additional note.......

Re (DC resistance) is measured with the voice coils in series, for parallel-wired specification divide Re by 4. All other specifications remain the same.

So this dual 4ohm sub in series is 6.5 ohms and not 8ohms and in parallel is 6.5/4= 1.625ohms and not 2ohms. Very very close but not exact.

Try putting a meter on your sub in parallel first and see what happens. If it is closer to 2ohms then say 1 or 1.5 ohms you may be able to run it parallel.

Just do something

soundnsecurity

Gold - Posts: 2,711

Joined: November 10, 2008

Location: Louisiana, United States

Posted: May 28, 2009 at 8:47 PM / IP Logged

soundcontrol wrote:

If you have a meter you may want to double check the sub wired in parallel and in series and see what it actually meters out at.

The reason is, most subs will be rated at dual 4 or dual 2ohm subs and when you read the RE: for the sub it shows to be really close to its actual ratingbut not exact.

For example JL audio 13w6v2 dual 4ohm from the JL website

Its dual 4ohms but when you read the specs

RE: 6.50 Ohms *** with an additional note.......

Re (DC resistance) is measured with the voice coils in series, for parallel-wired specification divide Re by 4. All other specifications remain the same.

So this dual 4ohm sub in series is 6.5 ohms and not 8ohms and in parallel is 6.5/4= 1.625ohms and not 2ohms. Very very close but not exact.

Try putting a meter on your sub in parallel first and see what happens. If it is closer to 2ohms then say 1 or 1.5 ohms you may be able to run it parallel.

it doesn't matter that much because the resistance changes anyway once the sub is moving to music. the ohm ratings are a base line and like you already know are not exact.

skateit_12

Member - Posts: 34

Joined: April 22, 2009

Location: Ontario, Canada

Posted: May 28, 2009 at 8:56 PM / IP Logged

soundnsecurity wrote:

soundcontrol wrote:

If you have a meter you may want to double check the sub wired in parallel and in series and see what it actually meters out at.

Its dual 4ohms but when you read the specs

RE: 6.50 Ohms *** with an additional note.......

Re (DC resistance) is measured with the voice coils in series, for parallel-wired specification divide Re by 4. All other specifications remain the same.

it doesn't matter that much because the resistance changes anyway once the sub is moving to music. the ohm ratings are a base line and like you already know are not exact.

So are you saying it is safe to run parallel or in a series?

soundnsecurity

Gold - Posts: 2,711

Joined: November 10, 2008

Location: Louisiana, United States

Posted: May 28, 2009 at 9:09 PM / IP Logged

no, it isn't safe to just do one or the other without considering the amp's limits. there is a big difference in resistance between series and parallel . what i WAS saying is that you should go by what is written on the spec sheet because that is the base line. a speaker will never be exactly what the manufacturer rating says, the resistance changes all of the time when the sub is in motion. a 4 ohm sub will peak and dip while it is in motion. amps are made handle these short peaks but constantly running an amp with a lower resistance load on it than it is made to handle constantly with lead to the destruction of your amp or sub (in this case your sub will probably go first)

in short, dont run your sub on your amp at 1 ohm. use single coil 2 ohm or series both coils into 4 ohms. that is what will be safe for your specific setup. i dont have enough faith in your sub to take 1000 watts from your amp regardless if the amp can handle a 1 ohm load which you cant be sure of either. go with what is safest

< Prev Page Next Page >

Printable version

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

Search the12volt.com

Follow the12volt.com

Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.