Ok so im wondering this. My friend has his sub hooked up by both negatives off the amp and no positive to the sub at all. To me this makes no sense on how it works. But he says it sounds better than 1 pos 1 neg
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84 Fiero
that sounds like BS to me. Does your friend like to partake in the Peruvian Marching Powder? I mean crack for those of you who don't get jokes very well. I have the feeling that would come up if I didn't say something...
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sounds like he has it wired up parallel but just doesn't know it, lol. ( + to +..neg-neg.)
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Sounds like he doesn't know that its physically impossible to play off of two negs, right?
Dunno how many of you are old enough to remember when Orion needed a bridging adapter to bridge their amps. These adapters inverted the right channel (if I remember correctly) so that the amp could be bridged like many others. The only possible way (that I can think of) that this could work is if he's using an old-school Orion amp without the bridging adapter...and if this is his method, then I wouldn't give it too long before the amp goes up in a blaze of glory.
For some older amps, the neg of one channel is the same as the pos of the other so he would essentially be running it hooked up to a pos and a neg. This would only be true for one pos and one neg (NOT BOTH).
You have to look at the potential difference in the two channels
One channel the neg is the reference and the pos varies in proportion to the output. The other channel the pos is the ref and the neg varies inversely proportional to the output. Both sides would be putting out the exact same signal.
This allows the connection of a speaker to the pos of one side and the neg of the other to utilize both channels in a bridged configuration.
I'm not sure if any newer amps are using this setup or not.
F-ing liar!!!! At least, your freind is. lol.
It's a similar concept as a center tapped transformer. The center tap is the negative of one side and the positive of the other side at the same time. Electrically the same connection point.
Labotomi is correct. That's the basics of bridging an amp. The reason that the older Orions needed the bridging adapter is because one channel was "backwards" to what we have on today's amps. If your friend is using an older Orion, he could be fudging and using both negatives. That would be what would be necessary without the bridging adapter...and it isn't an optimum setup. It doesn't allow the amp to operate at it's full potential and may cause damage over the long haul.
Ok lemme clear this up. He has did this with three different amps. My RF 800 watt amp. A sony 760 watt amp and an MTX8100D amp. I have seen all three setups and he does use to negs from the amp and no positives. I looked at the amp and was wondering why it was like that and he said it sounded better that way. It sounded fine to me. I never heard it the regular way but it sounds good the way it is.
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I was wondering what equipment was being used. Sounds fishy, that's for sure. Are you able to follow the wiring all the way from the amps to the subs? I ask because this just isn't the way it's done. I tried to quickly research your MTX8100D amp and can't find anything. I find an MTX81000D, which I think is what you're referring to, but that's the closest I can get. That amp is mono, so you'd almost have to use both a positive and a negative to make it function at all, unless there's some odd wiring inside the amp itself, which I would doubt with MTX...they're pretty good equipment. Your RF would need to have the left positive and right negative connected to make the power it's supposed to (I went to RF to make sure...even though I run 5 very old RF variants, I wanted to make sure....it's been a while since I installed them). The left positive is the woofer positive and the right negative is the woofer negative. I looked at the manual for the Power 800 trans-ana, but it's the same info for my ancient amps (by ancient, I mean around 17 years old and still clear as a bell). I don't see why the Sony would have been any different...as long as it was bridgeable, you'd wire it the same way. It's just standard.
The only reason I can figure why this is what he was doing was because he didn't take into account the fact that the woofers may have been wired backwards (with respect to positive and negative) and have been out of phase, causing phase issues between them and the front stage. In layman's terms, this would make the midbass and some of the low end sound like trash, and might make the woofers sound delayed with respect to the rest of the music. This may have been the only method he might have known to correct it.
I've seen some odd things before in the systems I've taken apart for re-installation, and many of them have left me wondering why they worked. This most likely would have been one of them. It defies logic and the laws of amplification. I'd try to wire it properly and see how it sounds...just make sure that you've put the positive of the speaker to the left positive on the amp and the negative of the speaker to the right negative on the amp. I will guarantee that the gains and eq settings will be way off, though...you might find that your system is much more bass-heavy than you figured it could be. This is a good thing, since it will let you turn the gains down and save on the possibility of clipping the speakers. And if it doesn't sound any better, try swapping the positive and negative wires on the sub before going back to the way he had it. You might be surprised at the results....
Good luck!
on my audiobahn amp, if you connect both wires to + ( i can't remember now) it will automatically bridge for you. it says right on the amp - bridged and points to the two connectors. maybe thats what he is talking about.
But the RF and the MTX won't do that on their own. I've checked the manuals to be sure. That's why I suggested what I did....unfortunately, I'd already thought of that, just didn't mention it. Good thinking, though.
on my home stereo system, i remember back in the day my dad telling me to hook up either both pos's or neg's to one speaker. i asked why (he's an electonics technician) and sure enough, it worked. i dont know why it worked, but yes it worked. so yes i can believe this story. is it SMART to do, no, i think there's a good reason why you wire up one pos and one neg, but hypothetically, it does work.
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That's what I was getting at. I've seen things work that really shouldn't. I think this is one of them. Depending on how long ago this was, and what technology the amp was using, this may or may not have had any effect on the amp. Newer amps will more often go into protection when you try to do this, though. I agree with you completely, though....it's not what I'd do, but I didn't install the system in the first place.
I really couldnt tell you why it worked, The MTX was an 81000D amp i missed a zero. The RF amp is a p800.2 i believe. I guess the next time i go to his house me and him will try and play around with it and see what we can do. Oh btw the way he has his second sub going is its conneted to the terminals on the first sub. I dont know how he has it in the box.
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Ive had 2 amps in my car (A Rockford Fosgate and a Kenwood) they both worked like this...
If you use + from one channel and - from the other channel, it bridges it. Thats how most work I beleive. Thats probably what he did.
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Sandstorm-J wrote:Ive had 2 amps in my car (A Rockford Fosgate and a Kenwood) they both worked like this...
If you use + from one channel and - from the other channel, it bridges it. Thats how most work I beleive. Thats probably what he did.
i dunno if you've been following..but the discussion is about running two NEGATIVES....
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