what possible backdraft from this setup?
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=40764
Printed Date: May 19, 2024 at 1:27 AM
Topic: what possible backdraft from this setup?
Posted By: 94legend
Subject: what possible backdraft from this setup?
Date Posted: October 12, 2004 at 8:27 PM
We never came across this , and just thought about it. We already know that when you're running a system, Everything should be matched up such as ohm load, amps and etc.
We have this 1000 / 1 Mono Class D amp.
Running on two "x" 12's DVC's at @ 4 ohmz. Now, we have another set of "B" 12 SVC's and would like to run them all together off that one amp. Now how would we do this? Would we just attach the SVC's in parellel with the 12 DVC's?
Replies:
Posted By: stevdart
Date Posted: October 12, 2004 at 11:50 PM
Your final impedance of a DVC will have to equal the impedance of an SVC. For example, a DVC 2 ohm woofer can be wired with a SVC 4 ohm woofer...as long as the DVC is wired in series to make 4 ohms. I can't tell from your post exactly what you have to work with. But whether one woofer is wired in parallel to another woofer, or in series...all depends on what the final outcome in ohms will be, and what the particular amp can handle. Post all the particulars.
-------------
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: October 12, 2004 at 11:53 PM
This is an interesting one, It would depend totally on how the dvc's are wired and this only. If the dvc's are wired in a series/parallel circuit, they are infact a 4 ohm load, then with that load wired in parallel with the svc 4 ohm drivers, a final load of approx 1.33 ohms will be presented to the amp. Now if the sub are dvc subs are parallel or series wired, then wired in any type of series or parallel circuit with the svc 4 ohm drivers, this will place either a highly unstable load on the amp or a real wacky load of say for arguements sake 11.657 ohms. While the latter may be safe, it is a combined unstable load of subs that may be 8 ohms, 2 ohms and 4 ohms. This is entirely dependent on how the dvc 4 ohms would be wired. <Edit> Stevdart, go to bed, it's late for you. I just finished cramming a volleyball down someone's throat and had to come back to work on a box. ------------- Top Secret, I can tell you but then my wife will kill me.
Posted By: 94legend
Date Posted: October 13, 2004 at 9:00 PM
Thanks alot. I'll get back to you guys on this.
Posted By: 94legend
Date Posted: October 25, 2004 at 12:36 PM
Ok on this, We ran on a different amp now,
its a 1600 watt / 2 channel amp
still with the same speakers, two ten's(SVC), two twelves (DVC)
The DVC's are capable of running 2, 4, 8 ohm load, But with this we ran the DVC's on OPTION 2
And as for the SVC's (10's)
We just ran them parellel to the DVC's as shown
The sound of this is not pretty at all.
The 12's loose alot of bass, and they all sound like distortion, the kind were as if it was out of phase.! anyone got any ideas or suggestions. We already know that this is a retarded setup, but its fun experiment for us!!! hahah good thing nothing caught on fire yet! 
Posted By: Ravendarat
Date Posted: October 25, 2004 at 12:41 PM
Are they outta phase? Bump each coil and make sure they are marked properly
-------------
double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer
Posted By: jeffchilcott
Date Posted: October 25, 2004 at 6:02 PM
I am betting on crossphase running 10' and 12's in the same space (trunk) can come close to canceling each other out
-------------
2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place
Posted By: stevdart
Date Posted: October 25, 2004 at 7:51 PM
94legend wrote:
The DVC's are capable of running 2, 4, 8 ohm load,
They're not quite that versatile. Either 1 ohm or 4 ohms using two of them. ------------- 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: jeffchilcott
Date Posted: October 25, 2004 at 8:06 PM
i still say pick one size sub and sitck with it, get 4 10's or 4 12's I would run 2 of each
-------------
2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place
Posted By: 94legend
Date Posted: October 25, 2004 at 8:34 PM
jeffchilcott wrote:
I am betting on crossphase running 10' and 12's in the same space (trunk) can come close to canceling each other out
We placed the 12's (DVC) in the trunk, and ran the 12 guage speaker wire underneath the seats and out to the back seats into the 10's. (4 door vehicle) So the box is sitting on the rear seats. ( the rear seats were removed). But we will go ahead and test each coil tonight. Hopefully they were out phase!
What also made us to conclude that it is out phase because of the fact that once we removed the 10's from this retarded pitcure, the 12's were pushing normally. So we'll definitely review this setup. We are not giving up on this until it XPLODS! lol get it XPLOD!!! hahahah .....................
Posted By: 94legend
Date Posted: November 01, 2004 at 7:38 PM
Anyone got any ideas, it sounds like its out of phase i have no possible clue what is going on here, there has to be a way!
Posted By: stevdart
Date Posted: November 01, 2004 at 8:24 PM
Like everyone said before, it's cancellation. Try this to test...play just the 12s with the 10s unhooked. Then vise versa. If each way sounds good and loud without the other pair hooked up, you know it's cancellation. If so, scratch the project. ------------- 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: ravenndude
Date Posted: November 01, 2004 at 9:42 PM
If that is the case (THe one that stevdart said) try putting the sub on a crossover so that the 12s see the lowe bass notes (say 18hz to 50hz) the so the 10s see the rest of the bass notes (overlap a little so 45hz to 120hz)
See how that works 
|