4 channel amp and 1 dvc sub
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=31142
Printed Date: June 30, 2025 at 9:16 PM
Topic: 4 channel amp and 1 dvc sub
Posted By: bp_viper
Subject: 4 channel amp and 1 dvc sub
Date Posted: April 27, 2004 at 4:01 PM
i have a few misc. stuff laying around and want to make something of it. i have a lanzar vibe 438 4 channel amp and a 10 inch jvc cs-wg1000 dvc sub. i was wondering if i could bridge the 4 channel to 2 and hook it up to each vc? if so is that amp too much power for the sub? the sub is 800 watts max the amp 2x700 RMS. i think it might be overkill. otherwise should i hook up the 4 channel to two 12" lanzars? i had them on another post ( need specs on amps and subs) trying to figure out what they were rated. either way how should i wire them. up for any input or other options. thanks
Replies:
Posted By: bp_viper
Date Posted: April 27, 2004 at 4:08 PM
sub is 4+4 ohm amp is 2-4 ohm stable
Posted By: lensam69
Date Posted: April 27, 2004 at 4:20 PM
Hey! By all means, If the amp can take the bridged Ohm load go on... The only way you can blow the sub would be by playing at full power for a long time. On the other hand if the Sub is rated beyond the amps capabilities then your sub will be in danger because the amp will drive it into clippling. Whatever you do, Take pictures!!!
Posted By: forbidden
Date Posted: April 27, 2004 at 5:04 PM
Wrong advice young grasshopper, go back to square one and do not pass go. You can overpower a sub all day long, if the sub can dissipate the heat that is generated it will play all day long without fail. If you overpower a sub and the sub cannot dissipate the heat, then it will fail, as it will also by being fed a clipped signal. So in part you are correct. You can also underpower a sub all day long and never have a problem with the sub , provided the amp does not go into clipping. Post up some more suggestions for this person and let's see how close you guys are.
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Top Secret, I can tell you but then my wife will kill me.
Posted By: bp_viper
Date Posted: April 27, 2004 at 7:12 PM
i am most worried about what the ohm load would be on the amp and how to wire the sub up. i was not sure if the sub would be alright to have a 4 channel bridged and hooked to each side of the dvc. thanks for the responses
Posted By: stevdart
Date Posted: April 27, 2004 at 7:26 PM
and right you are to worry about that. Each voice coil must get the same voltage. it would be very difficult to adjust the amp so that both front and back gains are identical. and even more difficult to keep it that way. That doesn't seem like the best way to put those spare items to use. ------------- Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: bp_viper
Date Posted: April 27, 2004 at 8:09 PM
yeah, found this- https://www.jlaudio.com/tutorials/dvc/diffsignals.html so will probly not go that way with the one 10. now thinking the 4 ch to the 2 12's? 2 12" dvc subs one 4 ch amp 2 ohm or 4 ohm stable. just dont know how to wire it...
Posted By: stevdart
Date Posted: April 27, 2004 at 8:24 PM
If the Lanzar subs are DVC 4 ohm, wire the sub in series then bridge to 2 channels like this 
It would be better if the subs are dual 2 ohm. You would wire them the same way but you'd get more power, like this 
one sub on channels 1 and 2, the other sub on 3 and 4. Bridged. (The amp is labelled as bridgeable?) ------------- Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: forbidden
Date Posted: April 27, 2004 at 8:24 PM
Holy nightmare unfolding before my eyes.  . We can sort this out though. If you have a 4 channel amp, most of these amps or only stable in this fashion. Very few 4 channel amps are stable to 2 ohm bridged. (1) 4 channels @ 4ohms (2) 4 channels @ 2 ohms (3) 2 channels @ 4 ohms (4) 2 channels @ 4 ohms and 1 channel at 4 ohm (5) 2 channels @ 2 ohm and 1 channel at 4 ohm In any case if you are going to use this amp to power more than 1 sub, each sub must now be in it's own separate enclosure. This is due to small to us but large to subwwofer discrepancies in the crossovers, gain setting and tolerance levels of each channel. We don't want one sub interfering with the other. If I had two subs, I would probably run it in method# 4. With two dvc subs, here is how to wire it. Use the other 2 channels of the amp to run the front speakers. 
------------- Top Secret, I can tell you but then my wife will kill me.
Posted By: stevdart
Date Posted: April 27, 2004 at 8:29 PM
I defer to Rob...his is the voice of reason. ------------- Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: bp_viper
Date Posted: April 27, 2004 at 8:45 PM
right...i misread the specs. bridgeable at 4 ohm, 2 ohm stereo stable. i think this amp is too powerful to run my front speakers though...4x175 rms at 4 ohms. i have rockford 6.5" that are i believe 100watts max.
Posted By: lensam69
Date Posted: April 28, 2004 at 9:51 AM
forbidden wrote:
Wrong advice young grasshopper, go back to square one and do not pass go.
Well, not neccesarily wrong, but incomplete... If you give out too much information at once, you end up confusing instead of educating the person. Still a newbie in this forum though. Gotta earn my stripes...
Posted By: bp_viper
Date Posted: April 28, 2004 at 6:52 PM
i finally got those lanzar subs out of the box. (the guy that had them before me used like a silicone sealer or something when he put them in....) they are 4 ohm svc subs. hopefully the last question i have is....when a bridged amp is hooked to a 4 ohm sub, does the amp see a 4 ohm load? or a 2 ohm load? thanks guys
Posted By: forbidden
Date Posted: April 28, 2004 at 8:30 PM
If you are only using one 4 ohm sub then the amp will see a 4 ohm load on the bridged terminals. ------------- Top Secret, I can tell you but then my wife will kill me.
Posted By: bp_viper
Date Posted: April 28, 2004 at 8:52 PM
so bridging 2 channels to 1 svc sub and 2 ch. to the other isnt a good idea? what would the ohm load be....still 4ohm?
Posted By: forbidden
Date Posted: April 28, 2004 at 9:03 PM
Yes it is, see one page back and it is option # 3. Make 100% sure that each sub is in it's own enclosure. They cannot be in the same box anymore.
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Top Secret, I can tell you but then my wife will kill me.
Posted By: bp_viper
Date Posted: April 28, 2004 at 9:04 PM
ok, thanks a lot for your help and patience with my learning.
Posted By: forbidden
Date Posted: April 28, 2004 at 9:08 PM
No thank you for asking a question that I'm sure others have learned from.
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Top Secret, I can tell you but then my wife will kill me.
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