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Running One VC on a DVC Sub


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soultinter 
Copper - Posts: 170
Copper spacespace
Joined: January 16, 2004
Location: United States
Posted: June 16, 2006 at 12:42 PM / IP Logged  
so how do you "short" the other coil ???????
wishboneattack 
Member - Posts: 32
Member spacespace
Joined: June 23, 2004
Location: United States
Posted: June 17, 2006 at 9:57 PM / IP Logged  
With a screw driver.... Running One VC on a DVC Sub - Page 4 -- posted image. LOL
I just read all the posts on here and laughed intensly. So did anyone get a DVC sub and test the idea? If you buy a DVC sub from any manufacturer there is a pamplet that comes with it and tells you to not hook up one coil in the manner you would both because you will damage the sub and void your warranty... Man it is almost worth buying one from Best Buy and trying it out on a Fosgate. Buy the service plan of course, for when it cooks... I've beenn in the business for 18 years now and can honestly say yes it will damage it. Seen it many times from people hooking them up not knowing the other VC needed to be hooked up too. I like to hear that scraping crunch noise when you push down on the sub. I get a good chuckle everytime.....
Please proceed...
I may be lost but I am making good time.
bmwpwner 
Copper - Posts: 174
Copper spacespace
Joined: January 28, 2006
Location: United States
Posted: June 17, 2006 at 11:32 PM / IP Logged  
yep come to my Best Buy and have me install a DVC woofer up for you and i will guarantee it will NOT void your warranty and i can optimize your woofer and your amplifier. i can't believe that anyone (after reading all the above posts) would post an reply claiming that running one voice coil will damage a woofer. also, anyone that knows how to tune an amplifier on a woofer should understand how impedance loads work and what will work and won't work. at our shop we not only install the equipment we educate the customer on how to listen to music and distortion. btw, instead of the crunching sound i like hearing "i know i hooked it up right but the amp keeps shutting off" and that is when we show them why we are paid professionals that understand impedance manipulation and optimization of their stereo (ie amp and woofer(s)). i will say it again, anyone that honestly believes that using one voice coil on a DVC is the best way to ruin the woofer you need to save up a big wad of cash and then take me to the casino because i've been running them that way for 10 years and never seen any evidence of this causing any damage to a woofer or an amplifier. customer's that are not educated on their equipment (and the equipment's limitations) can and will damage equipment until they are taught the correct way to use their stereos -- any really isn't that what we are all here to do? good luck and hope this helps!
"I cannot teach anybody anything, I can only make them think."
-Socrates-
speedstep1 
Member - Posts: 5
Member spacespace
Joined: April 12, 2006
Location: Singapore
Posted: June 18, 2006 at 4:50 AM / IP Logged  

hi, need some clarification here.... so can i say if i have a 2ch amp & a DVC, its either -

- bridged e 2ch amp, parallel e DVC & connect, makin it into 4ohm

or

- 2 seperate channel goes to 2 seperate coils, end up each coil is 8ohm??

which is e better option?? thks for e advice in advance.... :)

bmwpwner 
Copper - Posts: 174
Copper spacespace
Joined: January 28, 2006
Location: United States
Posted: June 18, 2006 at 7:27 PM / IP Logged  

if you are running a DVC woofer then it can be wired to act as the following impedances:

4 ohm (using only one coil)

8 ohm (requires running the coils in series ie run a jumper from + on one coil to the - on the other and using the left over inputs to go to the amp outputs)

2 ohm (parallel both coils)

if you are doing an AB Class amplifier (ie a standard 2 channel that is 2 ohm stable at bridged) then running the woofer as a 4 ohm woofer is the best way in my opinion. remember that when you wire the woofer to the impedance you desire then you must take into account that a 2 channel amp will half that ohm load on the bridged setting.

if you are using a D Class Mono block amp then whatever impedance you put in will be what the amp actually sees. these amplifiers do not half the impedance like AB class amps. in this case then you could wire the woofer in a 2 ohm load (given that the amp is 2 ohm stable) and that will maximize the woofer and the amp.

if you are running 2 woofers on a 2 channel then i would wire both woofers in 8 ohms EACH and then mono into the amplifier for the most bass. if you are looking to have more quality sound then run them in 4 ohms EACH and go stereo (left + and - going straight to left woofer and right + and - going straight to the right woofer) into the amplifier.

i usually try to wire the amp in bridged setting because if i don't then the customer will eventually come back behind me and do it and eventually kill the amp. good luck and hope this helps.

"I cannot teach anybody anything, I can only make them think."
-Socrates-
speedstep1 
Member - Posts: 5
Member spacespace
Joined: April 12, 2006
Location: Singapore
Posted: June 19, 2006 at 5:41 AM / IP Logged  

oh my..... i m totally lost now.... hahaha....... Running One VC on a DVC Sub - Page 4 -- posted image.

correct me if i am wrong -

1) with a class AB 2ch amp, if i bridge the 2ch into 1 (ie usin '+' of ch1, & '-' of ch2), it becomes 2ohm output, therefore i need to connect the DVC in parallel (2ohm) ???

or

2) if i only use 1 ch of the 2ch AB amp, & connect to only 1 coil, that means its 4ohm rite? what do i do with the 2nd ch & 2nd coil?

or

3) i bridge the 2ch amp, & connect to only 1coil, whats the effect?

4) i connect ch1 to coil1, & ch2 to coil2, whats the effect?

sorry for askin too much qns... noob here heehee

bmwpwner 
Copper - Posts: 174
Copper spacespace
Joined: January 28, 2006
Location: United States
Posted: June 19, 2006 at 10:25 AM / IP Logged  

it might be easier if you just post what equipment you have lol. if you have a 2 channel amp and are only using 1 DVC woofer then you want to wire the woofer as a 4 ohm (only one coil) because the 2 channel amp will half that impedance when you put that load on the bridged channel. so if you wire the woofer into 2 ohms and then mono that into the amp it will actually be running at 1 ohm rather than 2. that usually lets the magic smoke out of the amplifier and that is not good.

now hooking channel 1 to one coil and channel 2 to the other coil will work but will not be the most efficient way to do it. technically there isn't anything wrong with doing it that way but you aren't really maximizing anything at that point.

again, the halfing of the impedance only happens on the BRIDGED setting. you don't want to use channel 1 or channel 2 alone. either stereo or bridged is the best way to do it.

if you have anymore questions you can PM me with what equipment you have and i'll try to help ya.

btw, asking questions shows an eagerness to learn so, in my opinion, don't ever be embarrassed by asking questions. good luck and hope this helps.

"I cannot teach anybody anything, I can only make them think."
-Socrates-
speedstep1 
Member - Posts: 5
Member spacespace
Joined: April 12, 2006
Location: Singapore
Posted: June 19, 2006 at 10:16 PM / IP Logged  

hi bro,

thks for all e advice earlier!

currently, i have a 2ch rodek amp, stated 'competition series 500W' on e cover, but i still cant find e catalogue or exact model number on the net... & a JBL GT1000 10" bass tube. i am lookin into upgradin to 1x DVC due to the limited space in my boot.

so base on the advice earlier, can i conclude tat for max. efficiency, juz bridge e 2ch into 1, & connect to 1 coil???

thks!

Steven Kephart 
Platinum - Posts: 1,737
Platinum spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member consistently provides reliable informationspace
Joined: November 06, 2003
Location: Oregon, United States
Posted: July 05, 2006 at 11:57 PM / IP Logged  

nouseforaname wrote:
 their sub power will be decreased almost in half(30-40%).

Actually it's not quite that bad.  Read my previous post to see why.

Steven Kephart 
Platinum - Posts: 1,737
Platinum spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member consistently provides reliable informationspace
Joined: November 06, 2003
Location: Oregon, United States
Posted: July 06, 2006 at 2:14 PM / IP Logged  
I personally don't know.  The above came from my old bosses EE degree and a great deal of experience designing speakers.  Honestly the best way I have found to learn was to search all the car audio forums for Dan Wiggins' technical posts as they are ALWAYS very informative.  Here's some white papers he has written: http://www.adireaudio.com/TechInfo.htm  Also search in this online magazine: http://www.adireaudio.com/TechInfo.htm   He did the "chalkboard" section where people would ask him technical questions and he would answer.
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