I replaced a system like that at Microdyne while I worked there becasue you couldn't hear any of the speakers in the center of the room. I replaced them with a grid of ceileing speakers, all in phase. The sopund level was even all over the 200 foot by 200 foot building whin I finished.
BTW: I owned, and ran a commercial sound business for over 20 years.
It Most certainly matter. in MOST cases the striped one is negative Check carfully on your factory speakers sometimes they are marked iehter with a + sign or a dab of paint.. The guy that said it does not matter must be one of our customer that keeps sending in his radio with blown outputs
It only matters if one of the speaker leads is grounded at the speaker.
This is absolutely correct. There is no issue with " + " or " - ". The terminals could be arbitrarily called " OMO " and " DAZ ". Provided that there is no grounding at the speaker end, radio " + " could happily be connected to speaker " - " and vice versa. For stereo, they should both be connected the same way round because of phase cancellation in the bass, as already pointed out, but that is the only caveat. If someone is bringing in a radio with blown outputs, unless one terminal of his speakers is grounded, then reversed connections is most certainly not the reason. If, however, he is feeding the high level inputs of one of those nonsense 4 gigawatt amps, then there may just be an issue, but even those usually have floating inputs.
Arfa
... its stereo, right? Just check the other speaker in the vehicle, check where the solid or striped wire goes on that speaker, + or -. Connect new speaker accordingly. If the new speaker is not maked +, then connect a 1.5v cell to the speaker. If the cone pushes out then the terminal connected to the plus of the 1.5v cell is the positive (+) terminal of the speaker. Q.E.D.
So complete cancellation? Care to put a figure on it? I'd say for complete cancellation from a reasonable level you'd be talking about 40+dB. What about reflections?
Having the speakers as close and even as practical is always a good idea.
And I've installed hundreds of temporary PA rigs.
Reflections from what? We are talking about a production floor with over 100 workbenches at odd spacings, some with an enclosed back and top shelf, others that are open, with the test equipment stacked on heavy utility carts. It wasn't a studio or auditorium where you can do a quick and dirty layout. Even a 20 dB drop with hundreds of fans running, the sound is completely masked. The only way to get the sound where it was needed was from overhead, in a rough 20" * 20" grid. Some variations were required to place some speakers between rows of benches so two groups could hear and not be blasted out of their seats. It was a background music and paging system, not a rock concert.
You set up temporaries. If you install them they are permanent.
I've had days were I started at 4:00 AM and didn't get home till
10:00 PM running from town to town providing sound from portable systems. I've also spent weeks installing systems in very noisy factories while in a work basket 30 feet off the floor and over 110 degrees while someone drove a propane forklift for each step of the new wiring and each speaker. Try installing a system in a paper mill or corrugated box plant while it's running at full capacity. 40 years of it, starting at 13 years old.
I don't think that is standardized, so you would need to check BOTH speakers.
When you two are through trying to figure out whose is bigger, you might realize that you're talking about two different things -- car stereo vs high ambient noise system.
Anyone who has ever investigated a car setup - or installed their own - will know that speakers mounted in doors are wired in phase. Which tends to make other pronouncements from a source who says that's wrong equally as suspect.
_____________ Simple way to determine polarity for any speaks:
Grab a 9-volt battery(or even a bulky 6-V lantern deal). Place one speaker lead to the + and one to the - terminal. Watch - or have someone else watch if speaker is too far away - the movement of the cone driver as you remove and re-touch the + terminal. If the cone pushes up(or out as the case may be) the polarity, or "direction of motion" is positive.
You want all your speakers to move in the positive direction - that is, into the passenger cabin.
regards,
-CC
Do you always come to a gun fight with nothing more than an empty cap pistol? I could forward all those Viagra ads to you, if it would help you grow one.
Yes stereo car radios and tape players. I also installed a handful of Quad 8 track tape players in cars, back in the '70s. Car radios and home stereos were part of the commercial sound division for the shop I worked for. I probably installed over 250 car radios and stereos while I managed that division. it was fill work, between the big commercial jobs.
Right. And just who are you? A couple hundred posts from 1999?
Come on guys, chill.
Civility in debate is a desirable attribute. I know that is perhaps heresy on a usenet group but most readers do beleive it.
No one at this point can even sort out what your points were. All that it has become is a pissing match. Drop it it you don't have some points to make. Speaker phasing is just not that hard to figure out, and certainly not worth all the fuss.
Le>>
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I'd suggest you check maker's installations before sounding off. And then refund all the money you ripped off from your customers.
It's quite easy to test your theory at home by turning your Hi-Fi speakers so they face one another. And place your head between them to see if the sound disappears (with a mono signal).
So far so good, allow me to restate the situation:
1996 Dodge Caravan, replacing front speakers only at this time.Original speakers are unmarked, new ones are marked + and - .
So far so good.
Am now about to attach wires. Do the solid color wires go to the pos terminals and the striped wires go to the neg terminals?
Just wondering .........
So far so good, allow me to restate the situation:
1996 Dodge Caravan, replacing front speakers only at this time.Original speakers are unmarked, new ones are marked + and - .
So far so good.
Am now about to attach wires. Do the solid color wires go to the pos terminals and the striped wires go to the neg terminals?
Just wondering .........
Let's just say " yes ". It ain't gonna go bang, as you were worried about, as long as one of the terminals is not connected to the frame of the speaker, and the speaker is not also screwed direct to the metal of the door - just to be clear, that's BOTH conditions together. It's probably gonna sound fine. All of the car radios I've ever seen, with speakers in the doors, have been factory wired in phase, but if you feel that you are getting echo-y, thin sound, just reverse one of them. Again, no bangs to be had. Just as an aside. If the sound cancels in the middle of the vehicle, how would you know ?? All of the standard road vehicles that I've seen have seats offset to the sides ...
Arfa
>
It's most unusual for speakers not to be marked in some way. Are the terminals the same size? Car speakers in this neck of the woods have usually got one 1/8th and one 3/16th spade terminals. But if not other posts here give the method of checking using a AA cell, etc.
There are conventions for speaker wiring colours in cars but it's a question of knowing which one your maker followed - if any.;-)
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