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Re: Standard practice for installation speaker wiring? [message #319727 is a reply to message #319697 ]

Mon, 05 May 2008 16:03

Loren Aguey
Messages: 324
Registered: April 2007
Location: Vancouver, BC

Has No Life

Charlie Zureki wrote on Mon, 05 May 2008 13:00

Loren,
there's more to this than you're telling us...
How did you measure the 30.2 ohms? Did you disconnect the speaker wires at the Amp? Because if they were wired in series I'd think it would be more than 30.2 ohms., with adding in speaker wire resistance.
What gauge is the wiring?
Hammer

Yes I pulled out the banana plug from the amp and measured that. The wire appeared to be about 16 gauge. The total length of of the run from the amp to the first speaker is about 25 ft, with about 7-9 feet in between each additional speaker. Not factoring any resistance from the wire, shouldn't four 8 ohm speakers be right around 32 ohms?

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Re: Standard practice for installation speaker wiring? [message #319732 is a reply to message #319727 ]

Mon, 05 May 2008 16:17

Ivan Beaver
Messages: 4189
Registered: January 2005
Location: Atlanta Ga area

Has No Life

Are you measuring impedance or resistance?

What type of meter did you use?

Can I have some more talent in the monitors--PLEASE?

Ivan Beaver
dB Audio & Video Inc.

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Re: Standard practice for installation speaker wiring? [message #319758 is a reply to message #319732 ]

Mon, 05 May 2008 17:47

Loren Aguey
Messages: 324
Registered: April 2007
Location: Vancouver, BC

Has No Life

Ivan Beaver wrote on Mon, 05 May 2008 14:17

Are you measuring impedance or resistance?

What type of meter did you use?

Impedance. A Cen-Tech digi multimeter. Just to make sure it was in the ballpark I measured one speaker by itself and it was 9.something and when I put it back and measured the whole load was 30.2

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Re: Standard practice for installation speaker wiring? [message #319788 is a reply to message #319758 ]

Mon, 05 May 2008 19:05

Hal Bissinger/COMSYSTEC is currently offline

Hal Bissinger/COMSYSTEC
Messages: 217
Registered: April 2004

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Hmmm, I don't think I see an impedance function on that.

-Hal

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Re: Standard practice for installation speaker wiring? [message #319794 is a reply to message #319788 ]

Mon, 05 May 2008 19:29

Loren Aguey
Messages: 324
Registered: April 2007
Location: Vancouver, BC

Has No Life

Hal Bissinger/COMSYSTEC wrote on Mon, 05 May 2008 17:05

Hmmm, I don't think I see an impedance function on that.

-Hal

Looks like I need to bone up on my impedance vs resistance terminology. I saw the symbol for ohms, and I thought that was only for impedance. But, it appears thats not the case. Learn something new every day...as they say. So how does that affect my measurements and what they mean exactly?

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Re: Standard practice for installation speaker wiring? [message #319797 is a reply to message #319794 ]

Mon, 05 May 2008 19:38

Hal Bissinger/COMSYSTEC
Messages: 217
Registered: April 2004

Has No Life

Impedance is basically AC resistance. An impedance meter applies an AC voltage to the device under test rather than a DC voltage like a VOM does. If the DUT is purely resistive both meters will read the same but if the DUT is inductive, capacitive or a combination of both the reading will depend on the frequency of the AC applied and will be indicated as the impedance at that frequency.

-Hal

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Re: Standard practice for installation speaker wiring? [message #320600 is a reply to message #319794 ]

Wed, 07 May 2008 16:24

Ivan Beaver
Messages: 4189
Registered: January 2005
Location: Atlanta Ga area

Has No Life

Loren Aguey wrote on Mon, 05 May 2008 20:29

Hal Bissinger/COMSYSTEC wrote on Mon, 05 May 2008 17:05

Hmmm, I don't think I see an impedance function on that.

-Hal

In loudspeakers (in most cases-not all) the DC RESISTANCE will be less than the impedance (AC) seen by the amplifier. Sometimes by a little, and sometimes by a lot. You REALLY need an impedance meter to see what the amp is seeing.

All you are measuring is the DC resistance of the wire hooking htem up and the wire inside the loudspeaker.

Can I have some more talent in the monitors--PLEASE?

Ivan Beaver
dB Audio & Video Inc.

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