voice coil damage

[94tegRS]

I have a older pioneer amp that is 2 channel, and it is bridgable. I have had it for a while and just want a little bit of bump in my car til I have the moeny for the system i really want. I was just gonna buy a audiobahn AW1251T sub for 30 bucks off ebay but it is 4 ohm DVC. now I know I could do it series for 8 ohms and put it to the amp bridged but then I only have about 35 watts goign to the sub. the amp wont handle 2 ohms bridgd so the option I got left is each 4 ohm V.C. to one channel, but will this damage the sub at all having different signals to each coil or are bass signals monaural(I think that'd be the word)?

[unusualcivic]

don't EVER wire a DVC sub in stereo like that, its just asking for disaster.

[94tegRS]

ok, thats what I was thinking. but for some reason all the cheap subs i found just to have something were DVC, I found for a lil more some sony SVC's but i had the cheap sony subs from a few product lines ago and wasnt too impressed, so i was just gonna try something different, Ive had some mid-line audiobahns and was VERY impressed with them, especially for the price. I guess Ill just put the 35 watts to it, I know it wont be nothing much, but I think it will enhance the lows enough, right now i got NONE, my speakers just cant handle anything below like 200Hz, they suck and a sub to this amp is cheaper than all new speakers.

I am soon going to buy 3 alum10Q's and power them with a JBL BP1200.1 but might sell current car so dont want to do it just yet.

[tibby01]

god i hope that 35 watts is rms, cause most subs need more than 35w to make sound at all. if i were you, i would just save the money. even if the sub does make noise, it will sound like shit. work on getting your speakers replaced. try these places for cheap prices.

www.ikesound.com
www.thezeb.com

[94tegRS]

it is RMS, and I had a friend with a 12" soundstream in a ported box powered by only 50 watts RMS and it bumped, of course this was inside of a bug, but it was loud. I actually bought a JBL BP1200.1 and a couple 1 farad caps and for now I only bought one audiobahn ALUM12Q. I am gonna have another one later on but for now I cant afford another one.

[tran_nsx]

why don't u just get one of those 8 inch bazooka tubes temperarily until u have ur system. i know those are bazooka aren't impressive or anything but hey its bass. they are not that expensive i believe, especially on ebay, u don't have to worry about speaker boxes, and u can always sell them later on.

[GSteg]

for now, just wire each coil to each channel

[94tegRS]

well, I was todl to not EVER wire a dvc sub like that, and thats what I thought so im sticking to that oppinion, but my 1200.1 and alum is on its way and I got no problem there.

[GSteg]

there are no consequences in doing so unless your channel 1 is sending completely different signal than channel 2. If thats the case, then the amp is broken, but i doubt that's the case.

Its just like wiring a sub in parallel. (in a way)

[tibby01]

hes right....

it will create a 2ohm load on the amp, as opposed tto wiring it in series(8ohm).

just make sure your amp can take a 2ohm load, and that your subs can take the extra power being pumped to them.

[94tegRS]

ok, I know all about series and parallel diffring loads and that stuff. 1 6 ohm DVC is 3 or 12 ohm. it would take 3 if you wanted the 1 ohm load, 2 4 ohm dvcs are 1 ohm or 4 ohms or 16 or whatever. I used to know the formula and everything. but if my amp is a 2 channel stereo amp... stereo means laft and right channels, and I know that music has different signals on different channels. I can hear it, I was wondering if this was true with the bass frequencies. I doubt it would be though because you cant really pinpoint where lows are coming from like you can the highs so I dont see why they would record lows differently, but wanted to be sure.

[94tegRS]

also a 4 ohm coil to each channel doesnt give the amp a 2 ohm load. the amp being bridged to one 4 ohm coil gives each channel 2 ohms. or a 4 ohm dvc paralleled top each channel now it has 2 ohm loads on each channel.

[unusualcivic]

lets think about this for a second. DVC means 2 voice coils on one subwoofer. These voice coils are mechanically coupled to each other. If they are trying to move different directions, it will either tear the sub up, burn out a channel on the amp, or both. do not wire a DVC sub in stereo, unless you are willing to accept that risk.

[GSteg]

Worst case scenario is if they are wired completely (180 degrees) out of phase. When this happens, the two magnetic fields cancel each other out, causing the voice coil not to move. That is the worst that will happen. In stereo mode, there will only be a slight alternation between the two signal. The differences in amplitude of the signal will be greatest if they are each 180 degrees apart from each other. But that should never happen with muic because if it were to happen, then we can assume that the recording company did a bad job of recording. If they have done that, they would waste their (and our amp's) energy on trying to reproduce signals that would cancel each other out.

The worst thing that could happen is if you send so much power to a sub (rated at say 300w per coil) and wire it completely out of phase. Since 300w per coil is it's Pmax when the driver is moving, standing still because of the phase will burn the coil up, because there are no movement, causing the voil to now draw air in from the pole piece. But music isn't like that. Music will be dynamic and will have very little alternation. Never will it be completely 180 degrees out of phase so there is nothing to worry about.

The magnetic field is not strong enough to literally rip the subwoofer apart, even in bad situation. If you ever tried to pull each end of the voice coil, you'll see that it's going to be hard to tear it up. That is with bare hands, pulling it outwards (no bending).

[94tegRS]

ok, and we actually dont need to argue over this anymore, I got all new comoponents coming in the mail and its gonna be DVC parallel to a mono amp.