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Post subject: First multimeter /first parallel cabinet
Posted: Mon Apr 01, 2013 7:48 pm
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I want to wire a 2x12 cabinet to use with my champ 600. I have 2 speakers from 2 different fender amps that no longer work. One is a fender frontman speaker and one is a fender princeton 65 speaker. Both speakers say 8ohms. One speaker is a higher wattage than the other. 65 and I believe 70. I want to hook them up in parallel and use with the champ and a few other 4ohm small tube amps.
Is there a problem because the speakers are different wattages? Also I used a multimeter for the first time. The princeton dsp 65 speaker measures about 9.1 and the frontman measures about 8.4. Any special concerns or can I just go for wiring these in parallel to try and match 4ohms of the champ600 and bugera v5 also 4ohms. Thank you


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Post subject: Re: First multimeter /first parallel cabinet
Posted: Mon Apr 01, 2013 8:36 pm
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Differing speaker wattages are no particular problem when they are that close in power-handling capability. It'd be an issue if one speaker were say, 30 watts and the other 100 watts, and you intended to use them with a 70-watt amp.

As for the variance in DC resistance, that's quite common when measuring speaker coils -- what you're actually looking at is inductive impedance, which is a bit different than true resistance. You'll seldom see precisely 8 ohms on a speaker marked as such.

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Post subject: Re: First multimeter /first parallel cabinet
Posted: Mon Apr 01, 2013 8:58 pm
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Retroverbial wrote:
Differing speaker wattages are no particular problem when they are that close in power-handling capability. It'd be an issue if one speaker were say, 30 watts and the other 100 watts, and you intended to use them with a 70-watt amp.

As for the variance in DC resistance, that's quite common when measuring speaker coils -- what you're actually looking at is inductive impedance, which is a bit different than true resistance. You'll seldom see precisely 8 ohms on a speaker marked as such.

HTH

Arjay

Very good thank you!!! First multimeter I've owned. After I wire the speaker in parallel (unplugged from actual amp) can I measure ohms again with touching one terminal positive on one speaker + and - of the other speaker? Would I see a reduction of ohms at that point after they are wired in parallel? Thank you


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Post subject: Re: First multimeter /first parallel cabinet
Posted: Mon Apr 01, 2013 8:59 pm
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NoPro wrote:
Also I used a multimeter for the first time. The princeton dsp 65 speaker measures about 9.1 and the frontman measures about 8.4.


Don't know what you did, but you didn't use your multimeter correctly. The DC resistance of a speaker will always measure less than the rated impedance of a speaker, not more.

Either way, Arjay is correct. Wire the speakers in parallel and they will work fine.

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Post subject: Re: First multimeter /first parallel cabinet
Posted: Mon Apr 01, 2013 9:01 pm
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NoPro wrote:
Retroverbial wrote:
Differing speaker wattages are no particular problem when they are that close in power-handling capability. It'd be an issue if one speaker were say, 30 watts and the other 100 watts, and you intended to use them with a 70-watt amp.

As for the variance in DC resistance, that's quite common when measuring speaker coils -- what you're actually looking at is inductive impedance, which is a bit different than true resistance. You'll seldom see precisely 8 ohms on a speaker marked as such.

HTH

Arjay

Very good thank you!!! First multimeter I've owned. After I wire the speaker in parallel (unplugged from actual amp) can I measure ohms again with touching one terminal positive on one speaker + and - of the other speaker? Would I see a reduction of ohms at that point after they are wired in parallel? Thank you


Yes, you can but the number will have no real value except to prove connectivity. Measure at the output jack.

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Post subject: Re: First multimeter /first parallel cabinet
Posted: Mon Apr 01, 2013 9:26 pm
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bluesky636 wrote:
NoPro wrote:
Retroverbial wrote:
Differing speaker wattages are no particular problem when they are that close in power-handling capability. It'd be an issue if one speaker were say, 30 watts and the other 100 watts, and you intended to use them with a 70-watt amp.

As for the variance in DC resistance, that's quite common when measuring speaker coils -- what you're actually looking at is inductive impedance, which is a bit different than true resistance. You'll seldom see precisely 8 ohms on a speaker marked as such.

HTH

Arjay

Very good thank you!!! First multimeter I've owned. After I wire the speaker in parallel (unplugged from actual amp) can I measure ohms again with touching one terminal positive on one speaker + and - of the other speaker? Would I see a reduction of ohms at that point after they are wired in parallel? Thank you


Yes, you can but the number will have no real value except to prove connectivity. Measure at the output jack.


Not sure I'm using the multimeter correct ...I am measuring with the correct + - but the multimeter goes from 200,2000, 20k, 200k and then 2000k. I had mine set on 200.


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Post subject: Re: First multimeter /first parallel cabinet
Posted: Mon Apr 01, 2013 9:34 pm
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NoPro wrote:
Not sure I'm using the multimeter correct ...I am measuring with the correct + - but the multimeter goes from 200,2000, 20k, 200k and then 2000k. I had mine set on 200.


That is the correct range to use. I'm just saying that a typical 8 ohm rated speaker will measure somewhere around 6 to 7 ohms with a DMM because all you are reading is the voice coil resistance. All the DMM reading is telling you is that the voice coil is good and provides a clue, but not an actual value for the speakers nominal impedance. Impedance is a complex number that varies with frequency and has resistinve, capacitive, and inductive components.

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Post subject: Re: First multimeter /first parallel cabinet
Posted: Mon Apr 01, 2013 10:00 pm
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bluesky636 wrote:
NoPro wrote:
Not sure I'm using the multimeter correct ...I am measuring with the correct + - but the multimeter goes from 200,2000, 20k, 200k and then 2000k. I had mine set on 200.


That is the correct range to use. I'm just saying that a typical 8 ohm rated speaker will measure somewhere around 6 to 7 ohms with a DMM because all you are reading is the voice coil resistance. All the DMM reading is telling you is that the voice coil is good and provides a clue, but not an actual value for the speakers nominal impedance. Impedance is a complex number that varies with frequency and has resistinve, capacitive, and inductive components.

Woah ok. Thanks, I remember reading the values on the multimeter vary and this is not a very accurate multimeter ...but it was 2.99 and its prob better than no multimeter ...
Just so I'm clear on parallel wiring

1 positive(red wire in my case)wire from 1 speaker to positive on jack
1 positive wire from 2nd speaker to positive on jack
1 neg(black wire in my case) from speaker to neg on jack
1 neg wire from second speaker to neg on jack

I could swear some parallel diagrams I looked at seemed different than others so I wanna be sure I'm doing this as simple as possible for 2x12 parallel


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Post subject: Re: First multimeter /first parallel cabinet
Posted: Mon Apr 01, 2013 10:18 pm
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Post subject: Re: First multimeter /first parallel cabinet
Posted: Mon Apr 01, 2013 10:30 pm
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bluesky636 wrote:
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Ok that's alot different than what I thought...I'm glad I asked. Thanks Bill- Jon

Re:The speaker that's closest to the jack in your diagram...
The red wire is joined at the terminal with a 2nd red wire at the terminal? Yes..not after the terminal? Just being extra cautious becuase I can't use clips etc and can't make a mistake


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Post subject: Re: First multimeter /first parallel cabinet
Posted: Mon Apr 01, 2013 10:36 pm
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What I'm tring to say is the speaker closest to the jack has 2 red wires on it etc..yes


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Post subject: Re: First multimeter /first parallel cabinet
Posted: Mon Apr 01, 2013 11:55 pm
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Actually I see a second area to solder on same positive terminal. Same on neg.
There's 3 areas to solder per terminal. One has the voice coil so I'm staying away from that one but I'm thinking the T in the diagram might be referring to the where the second wire going to the jack from the terminal/s ? Not sure of the proper name of each area that can be soldered per terminal.


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Post subject: Re: First multimeter /first parallel cabinet
Posted: Tue Apr 02, 2013 3:37 am
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Yes, each speaker has two terminals for + and two terminals for -. Both + terminals are electrically the same connection point, and both - terminals are electrically the same connection point. It doesn't matter which speaker that you use for two wires, just be sure that the + of both speakers are connected together with one wire, and the - of both speakers are connected together with one wire, using one terminal for each wire connection on each end of the wire, and that one + from one speaker connects to the jack (tip), and one - from one speaker connects to the jack (sleeve).

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Post subject: Re: First multimeter /first parallel cabinet
Posted: Tue Apr 02, 2013 6:58 am
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NoPro wrote:
bluesky636 wrote:
Image

Ok that's alot different than what I thought...I'm glad I asked. Thanks Bill- Jon

Re:The speaker that's closest to the jack in your diagram...
The red wire is joined at the terminal with a 2nd red wire at the terminal? Yes..not after the terminal? Just being extra cautious becuase I can't use clips etc and can't make a mistake


The picture shows exactly what you wrote. This is not rocket science. Plus to plus, negative to negative. Connect to the tip (plus) and ring (negative) of the jack. Whether you connect all of the wires to the jack or to one of the speakers is irrelevant. It is all the same electrically.

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Post subject: Re: First multimeter /first parallel cabinet
Posted: Tue Apr 02, 2013 6:59 am
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NoPro wrote:
What I'm tring to say is the speaker closest to the jack has 2 red wires on it etc..yes


It doesn't matter which speaker has the two wires on each lug. Connect everything to the jack if you want. Its all the same.

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