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#244856 - 02/04/09 12:55 PM Center Speaker wiring
Worfzara Offline
aficionado

Registered: 07/25/05
Posts: 709
Loc: London area, Ont, Canada
What happens to the sound of a center speaker if the positive and negitive connections are switched? I know it has something to do with phase, but since it is a center, by listening how do you know it is wired correctly. And does it even matter?

pn
_________________________
paul

Axiom M80, VP180, Qs8, EP500
Panasonic PT-AU900
AudioTrak AT-6100
Denon AVR-990

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#244857 - 02/04/09 01:02 PM Re: Center Speaker wiring [Re: Worfzara]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13337
Loc: Iowa
not sure, but I know the DVD's Avia and DVE Essentials has test to make sure all your speakers are in phase. I'm sure it would sound different in some way.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
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#244864 - 02/04/09 01:10 PM Re: Center Speaker wiring [Re: Worfzara]
BrenR Offline
connoisseur

Registered: 12/10/03
Posts: 3602
Loc: Winnipeg MB Canada
It will still be 180 degrees out of phase with the mains... and since it shares some program material with them, that would be bad.

Bren R.

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#244883 - 02/04/09 02:28 PM Re: Center Speaker wiring [Re: BrenR]
jakewash Offline
shareholder in the making

Registered: 12/26/03
Posts: 10398
Loc: Calgary, Alberta
Generally, the out of phase speaker lacks bass and sounds funny.
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Jason
-----------------
TTTHHHPPPPPTTTT!

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#244885 - 02/04/09 02:40 PM Re: Center Speaker wiring [Re: jakewash]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13337
Loc: Iowa
it sounds out of phase. \:\)
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#244887 - 02/04/09 02:53 PM Re: Center Speaker wiring [Re: Worfzara]
MarkSJohnson Offline
shareholder in the making

Registered: 09/27/04
Posts: 10911
Loc: Central NH
Worf:
It does matter.

If you can't check the polarity (wire in-wall, for instance), here's how it's traditionally done:

1- Disconnect one of your mains, and move the other as close to the center as you can.

2- Set both for "Large in your receiver.

3- Play a mono signal through both speakers with a decent amount of bass.

4- Try switching the polarity of the center speakers' wires back and forth to see if one way has more bass. That orientation is the correct polarity.
_________________________
::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::

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#244902 - 02/04/09 03:45 PM Re: Center Speaker wiring [Re: MarkSJohnson]
tomtuttle Offline
axiomite

Registered: 06/20/03
Posts: 8292
Loc: Tacoma
Well, aren't YOU just Mr. Helpful today.
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bibere usque ad hilaritatem

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#244905 - 02/04/09 04:04 PM Re: Center Speaker wiring [Re: tomtuttle]
RickF Offline
axiomite

Registered: 02/26/05
Posts: 5210
Loc: Vero Beach, Florida
I'm impressed!
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Our Room

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#244908 - 02/04/09 04:16 PM Re: Center Speaker wiring [Re: RickF]
Worfzara Offline
aficionado

Registered: 07/25/05
Posts: 709
Loc: London area, Ont, Canada
Thanks Mark,

I was wondering if I could unplug the positive or negitive from the amp and put a volt meter to each wire at the other end. The one that registers juice would be the one plugged in. Would that work too?

paul
_________________________
paul

Axiom M80, VP180, Qs8, EP500
Panasonic PT-AU900
AudioTrak AT-6100
Denon AVR-990

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#244909 - 02/04/09 04:17 PM Re: Center Speaker wiring [Re: RickF]
MarkSJohnson Offline
shareholder in the making

Registered: 09/27/04
Posts: 10911
Loc: Central NH
::While Running Away, Makes Fart Noises with Armpit so as to Not Ruin Reputation::
_________________________
::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::

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#244912 - 02/04/09 04:33 PM Re: Center Speaker wiring [Re: MarkSJohnson]
pmbuko Offline
shareholder in the making

Registered: 04/02/03
Posts: 16282
Loc: Leesburg, Virginia
Not the flying half-chicken fart move!
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"I wish I had documented more…" said nobody on their death bed, ever.

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#244913 - 02/04/09 04:38 PM Re: Center Speaker wiring [Re: Worfzara]
jakewash Offline
shareholder in the making

Registered: 12/26/03
Posts: 10398
Loc: Calgary, Alberta
 Originally Posted By: Worfzara
Thanks Mark,

I was wondering if I could unplug the positive or negitive from the amp and put a volt meter to each wire at the other end. The one that registers juice would be the one plugged in. Would that work too?

paul
Actually if you unplug from the amp you would be getting no voltage/reading ;\)

Yes, you could check for the voltage at the speaker end with the wires off the speaker and a volt meter, this would give you the correct polarity, if a negative voltage shows up on the meter you know you are connecting the meter backwards.
_________________________
Jason
-----------------
TTTHHHPPPPPTTTT!

My HT

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#244915 - 02/04/09 04:44 PM Re: Center Speaker wiring [Re: jakewash]
MarkSJohnson Offline
shareholder in the making

Registered: 09/27/04
Posts: 10911
Loc: Central NH
Though your idea would still allow you to check for continuity with a multimeter....

Use all safety precautions! Unplug, discharge static, wear hearing and eye protection, don't operate heavy machinery, beware of erections lasting longer than four hours...yadda, yadda, yadda...
_________________________
::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::

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#244916 - 02/04/09 04:50 PM Re: Center Speaker wiring [Re: MarkSJohnson]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17783
Loc: NoVA
ain't no juice without no circuit...
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I am the Doctor, and THIS... is my SPOON!

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#244921 - 02/04/09 05:20 PM Re: Center Speaker wiring [Re: Ken.C]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13337
Loc: Iowa
I love Google Search also....
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#246229 - 02/10/09 09:12 PM Re: Center Speaker wiring [Re: SirQuack]
mrbiggyworth Offline
hobbyist

Registered: 11/07/07
Posts: 22
Loc: Toronto
You could disconnect amp & speaker. Then connect a 9 Volt battery at one end and check the other with a DC voltmeter to identify each wire.

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#246243 - 02/11/09 12:28 AM Re: Center Speaker wiring [Re: tomtuttle]
Ray3 Offline
connoisseur

Registered: 02/02/04
Posts: 2842
Loc: Rochester, NY
 Originally Posted By: tomtuttle
Well, aren't YOU just Mr. Helpful today.


I think it's just a phase he's going through.

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#246664 - 02/13/09 10:26 AM Re: Center Speaker wiring [Re: Worfzara]
el_giovato Offline
old hand

Registered: 01/05/04
Posts: 96
Loc: Northern Ontario
Another simple method to check for polarity is to use a AA battery. Disconnect the speaker wires from the amp, and connect the 1.5V AA battery to the 2 leads. If the woofer on the center speaker moves outward, the lead that was on the positive of the battery is the positive. If the woofer moves inward, the lead that was on the positive of the battery is the negative. Using a AA battery ensure the voltage going to the speaker is low enough to not cause any damage.

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