DVC and double magnat?

[Fluffy]

hei guys,

mind helping me to clear my doubts?:_:
wats the purpose of the dual voice coil and a double magnat?wats the pros and cons compared?

thanx.:X-:

 

[lutrix]

normaly in forum they said DVC produce more bass than SVC.......
Double magnat or magnet?

 

[cacin]

Hi,
Last time i read, the DVC give you more wiring option.

If you're using SVC 4 ohm sub, and you want a 8ohm load, you'lll need to wire them in series. This will induce a back EMF or something to the other speaker.

With 4 ohm DVC, you can have a speaker impendence of 8 ohm or 2 ohm on the same speaker. Wiring a DVC in series, does not have back EMF.

This is what I understand only. I might be wrong though. wait for sifus to reply.

 

[Fluffy]

opps. typo error. i mean magnet.:_:

omg,im so lost.LOL!

 

[Kippo]

double magnet or triple or 10 rows og magnet is just design intent. It is related to the magnet flux strength & flux area. This will affect motor design.

on DVC or SVC is mainly wiring flexibility coz' if u have sub with high rated power, there will be few amps that can give high power at 4 ohm. So u need to have 2 or 1ohm rating flexibility to get that power from the amp. Also a design intent.

on DVC louder than SVC is due to most DVC subs can take more power, stronger motor & more excursion.

 

[Fluffy]

okay..so far im good..but im a lil blurry about the ohm part.aikz.sorry for da silly questions.a higher ohm means?a lower ohm means?:_:

hrmm.so a DVC sub will produce more bass if there's an amp to whack it?am i rite?:_:

?wats the purpose of a multiple magnet design?just a design intent?

 

[howiechoo]

not really a dvc must louder than svc..it depend on the wattage btw them

double magnet can make ur sub go more harder..erm, how should i say it, it means the sub will more responsive..but it also depend on the magnet...if using 2 lousy magnet then also useless...

 

[Kippo]

fluf,
re-read my post above on magnet flux.
in case u still dont understand, if u want to have a sub with higher excursion, u may need a long voice coil. So u need longer magnet flux to keep the voice coil in the flux area. Just design intent.

DVC more bass? nope. Just wiring option. eXample below:
1. SVC sub at 4ohm. Rated at 1000w rms. Not many amps are available to give this power at 4ohm.

2. DVC sub wired parallel will have 1ohm. So many amps are available to give this power at 1ohm.

Just design intent so that u can sell it easily.

Ohm is impedence in subs because the signal from amp is AC. It is like resistance (DC only).

so the higher the number of Ohm, the higher the resistance to current flow. So less current means your sub not getting more power. & vice versa

 

[Fluffy]

ahh..okaay okay..im getting it already.haha.

but y does a certain sub/speakers offer a higher ohm some a lower ohm?is there a reason to it?sorry...jz curious.:_:

thanx guys.great info!

 

[Kippo]

fluffy,
just design intent.
home speakers have been using 8ohm as standard for a long time. So 8ohm is maintained.

on many2 ohm, that is marketing point.
have u come across a sub with dvc2ohm, dvc4ohm ? just to cater the wide range of market where ppl have amps with 1ohm or 2ohm or just 4ohm rated handling.


howie,
the performance of a sub depends on its motor design. It does not mean more magnet is better but magnet flux strength & area are part of motor design. What is important is getting linear motor force i.e BL factor.

 

[oldskolboyz]

Also don't forget about Damping Factor.. the ability of an amplifier to control the movement of a speaker.. the higher the damping factor, the greater the accuracy. Daming factor is calculated by dividing the speaker impedance by the output impedance of the amplifier. An amplifier damping factor will decrease as the speaker's impedance decrease.. that's why an amp running at 4ohms will provide tighter bass than at 2 or 1ohms.

 

[Kippo]

oldskolboyz,
damping factor will affect sub response if its value it damn small. Valve amp has generally low damping factor. But above minimum damping factor where you cannot hear the difference between 100 & 150 damping factor, who gives a damn about running the amp at 1ohm or 2ohm or even 0.5ohm.

and its start getting funny when ppl say better run at 8ohm for better control due to damping factor not affected.

 

[oldskolboyz]

oldskolboyz,
damping factor will affect sub response if its value it damn small. Valve amp has generally low damping factor. But above minimum damping factor where you cannot hear the difference between 100 & 150 damping factor, who gives a damn about running the amp at 1ohm or 2ohm or even 0.5ohm.

and its start getting funny when ppl say better run at 8ohm for better control due to damping factor not affected.

Can you list down amp power rate at 8ohm.. coz I never seen before.. normal amp rate I can see in our market is 75wrms X 4 4ohm, 150wrms X 4 2ohm, 100wrms X 1 4ohm, 200wrms X 1 2ohm, 400wrms X 1 1ohm, 800wrms X 1 0.5ohm.. everything from 4ohm & down to 0.5ohm.. I'm refer to amp damping factor... every amp have damping factor & writing in manual.. some maybe 6.5 at 4ohm, 8 at 4ohm, 4 at 4ohm...

 

[Zenn]

same thing lah just multiply or divide, no need to get excited..
eg)
lower the ohm, higher the power, lower the dampening factor (2ohm, 400W, 200)
higher the ohm, lower the power, higher the dampening factor (4ohm, 200W, 400)

i also dont worry much about amp dampening factor except when selecting an amp for midbass drivers or for subs.

 

[oldskolboyz]

Due to some ppl not happy with my earlier statement about Damping Factor, 4ohm will provide tighter bass than at 2 or 1ohms.

Look the amp itself, manufacturer has been write in manual the max at 4ohm (either ayam or branded, all same) & min some maybe can go down to 1 or 0.5ohm... from here we already know... definitely at 8ohm not efficient at all... so why we need to think or run the amp at 8ohm... even you buy RMxxK also no meaning if you run it at 8ohm.. that why DVC sub available in our market come with 2 series.. DVC 4ohm + 4ohm & DVC 2ohm + 2ohm.. to suit our need..

 

[Kippo]

oldskool,
u never seen amp specs. in 8 ohm? are u sure? home amp? hi-fi amp? they all rated at 8ohm.

and damping factor or 6.5?!?! are u sure u r looking at the right figure. coz' damping factor usually in values of 50s and higher. Valve amp has lower values. But 6.5 or 8 are doubtful.


-------------------------------------------------------------------------------------------------
guys,
if u want sub with good control, dont bother with the amp. Just get any SQ sub with good motor i.e that exihibits flat BL curve.

i'm running my sub at 1ohm and it is 'tight'. Not sure how u all define tight, control etc.
tight/control for me is the ability of the sub playing varying frequencies but u hear them note by note and not just some blur response in between eg. a sub plays 40hz then go to 60hz and then back to 30hz. You should hear clear single note at that freq.

i would suppose u all are referring to good transient by the sub. If it is then looking for amp with higher damping factor is not the solution.


the are sub amps that is totally bad that i've seen. Those are non-brand amp (incl. pegasus). Have u seen a sub cone still moving very slowly even when the bass stop?

 

[oldskolboyz]

oldskool,
u never seen amp specs. in 8 ohm? are u sure? home amp? hi-fi amp? they all rated at 8ohm.

and damping factor or 6.5?!?! are u sure u r looking at the right figure. coz' damping factor usually in values of 50s and higher. Valve amp has lower values. But 6.5 or 8 are doubtful.

I should stop here... To be hornest & professional.. we not in same leage.. I'm talking about Proton Car... You talking about Modenas motor.. if Naza car or Perodua still can consider but to far away..

 

[Kippo]

oldskol,
gave up because u cant back up ur statement?
so me modenas motor and ur a car? is this personal attack?

dude, i'm discussing about technical but u seems do not want to. If u want to say about mobile amp, it has been answered by zenn.
8ohm u just halve'd the power coz' P=IV & V=IR i.e ohms law.

 

[cacin]

Since I don't like to see people in the forum argue, try reading this and if still don't understand, ask the sifu :)

Hope this helps

http://mobile.jlaudio.com/support_pages.php?page_id=163

 

[oldskolboyz]

www.crutchfieldadvisor.com/ISEO-rgbtcspd/learningcenter/car/amplifiers_glossary.html