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#240561 - 01/15/09 10:04 PM Re: M80 v2's Arrived. Happy but slight issue. [Re: BoB/335]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6720
Loc: The Peoples Republic of Il.

From Alan


" The 4-ohm specification is simply a result of running six drivers in parallel. With all those six voice coils in parallel in a multi-driver speaker, it's electrically impossible to get the impedance any higher than 4 ohms without imposing power-wasting resistors in the crossover circuits or making other design compromises."
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#240566 - 01/15/09 10:09 PM Re: M80 v2's Arrived. Happy but slight issue. [Re: Wid]
BoB/335 Offline
aficionado

Registered: 12/26/08
Posts: 505
From my very limited knowledge on this subject I do believe that each individual component sould have been made with a different impedance to be able to come up with an 8ohm cab.

A guitar speaker can be made in 4ohm, 8ohm, an even 16ohm with what I believe is no difference in performance when each is driven by its appropriate power source.

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#240567 - 01/15/09 10:09 PM Re: M80 v2's Arrived. Happy but slight issue. [Re: Wid]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13318
Loc: Iowa
Yupper, also Bob if you run two 8ohm speakers in parrallel, you get 4 ohm. People that run 2 vp150's in parrallel get 3 ohms.
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#240572 - 01/15/09 10:18 PM Re: M80 v2's Arrived. Happy but slight issue. [Re: SirQuack]
RickF Offline
axiomite

Registered: 02/26/05
Posts: 5210
Loc: Vero Beach, Florida
And if you run and VP100 and a VP150 in parallel you get 3.43 ohms. \:\)
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#240573 - 01/15/09 10:20 PM Re: M80 v2's Arrived. Happy but slight issue. [Re: BoB/335]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6720
Loc: The Peoples Republic of Il.
 Originally Posted By: BoB/335
From my very limited knowledge on this subject I do believe that each individual component sould have been made with a different impedance to be able to come up with an 8ohm cab.

A guitar speaker can be made in 4ohm, 8ohm, an even 16ohm with what I believe is no difference in performance when each is driven by its appropriate power source.


What not the answer you wanted?
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"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud


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#240578 - 01/15/09 11:09 PM Re: M80 v2's Arrived. Happy but slight issue. [Re: Wid]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13318
Loc: Iowa
you pretty much hit it on the head Rick.
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#240728 - 01/16/09 01:42 PM Re: M80 v2's Arrived. Happy but slight issue. [Re: BoB/335]
lhulls Offline
veteran

Registered: 10/13/06
Posts: 139
Loc: Niagara Region, Canada
Hello Bob

What’s important to remember is that the 4 ohm impedance rating is nominal.
Music is dynamic, as is the impedance of any speaker; a loudspeaker’s impedance will fluctuate at different frequencies, high at some and lower at others.
Use the impedance rating as a simple guide to amplifier requirements. By the way, impedance has no influence over the sound of a loudspeaker.
There are a few manufactures of loudspeakers, (KEF comes to mind), which have built a purely resistive loudspeaker. “X” ohms at all frequencies.

Regards



Edited by lhulls (01/16/09 01:49 PM)
Edit Reason: didn't like the wording
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#240755 - 01/16/09 03:47 PM Re: M80 v2's Arrived. Happy but slight issue. [Re: BoB/335]
BrenR Offline
connoisseur

Registered: 12/10/03
Posts: 3602
Loc: Winnipeg MB Canada
 Originally Posted By: BoB/335
A guitar speaker can be made in 4ohm, 8ohm, an even 16ohm with what I believe is no difference in performance when each is driven by its appropriate power source.
And every change has a pro and con. A higher impedance speaker is easier to drive, but results in less volume at a given power level.

If you mean guitar cabinets, they're wired internally in both series and parallel to obtain the desired impedance, but wiring speakers in series opens a whole other set of sound quality issues, not something that's necessarily a big issue with lo-fi stage gear, but not something desireable in home audio reproduction.

Bren R.

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#240781 - 01/16/09 05:12 PM Re: M80 v2's Arrived. Happy but slight issue. [Re: BrenR]
BoB/335 Offline
aficionado

Registered: 12/26/08
Posts: 505
Yes I mean guitar cabinets and often the SAME speaker is made in 4ohm, 8ohm, or 16ohm speaker to use in differnt quantities of speakers in different applications.

http://www.usspeaker.com/jensen%20index-1.htm

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#240816 - 01/16/09 06:51 PM Re: M80 v2's Arrived. Happy but slight issue. [Re: BoB/335]
BrenR Offline
connoisseur

Registered: 12/10/03
Posts: 3602
Loc: Winnipeg MB Canada
 Originally Posted By: BoB/335
Yes I mean guitar cabinets and often the SAME speaker is made in 4ohm, 8ohm, or 16ohm speaker to use in differnt quantities of speakers in different applications.
From your link, I see that the Jensens max out at 16 ohm. Hooking up 6 drivers (like the M80) in parallel assuming all the speakers are 16 ohm gives 2 2/3 ohms. You'd need nominal 48 ohm speakers throughout the cabinet to get an 8-ohm speaker. OR you can add in some resistors and waste some power from the amp as heat. OR you can start hooking up in both parallel and series, but wiring speakers in series does some bad things acoustically.

Bren R.

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