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Post subject: Re: While we are on the subject of speaker cabs - Wattage
Posted: Thu Sep 06, 2012 5:23 am
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Arc-n-spark wrote:
Toppscore wrote:
aclempoppi wrote:
Yep, concurr with Shimmy. Two 8ohm speakers in parallel with that amp is the deal. A 50 and 30 watt are fine, unless you operate the amp at a very high volume most of the time. Yeah, I consider a parallel set-up safer for the amp. Some folks prefer a series set-up, for the sake of tone, and that's OK!!! Art
Art. Interested towards your statement:
Advantages/Disadvantages of Parallel vs Serial?
Safer for the amp? Why?
Tone? Why?
Other advantages or disadvantages?
Just interested. Thank you. Toppscore :)

Reread the posts in this thread to get most of your answers.


Good. Thanks. I will review this thread again to see what I missed.
Take care. Toppscore :)

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Post subject: Re: While we are on the subject of speaker cabs - Wattage
Posted: Thu Sep 06, 2012 8:47 am
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bluesky636 wrote:
My apologies to all concerned. I totally ignored the fact in a parallel connection, each speaker sees the same voltage but half the current.


It's all good 8) . It seems like such a fundamental thing that it's easy to forget because you just assume it. Even I thought, "Oh duh well of course" :wink:


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Post subject: Re: While we are on the subject of speaker cabs - Wattage
Posted: Thu Sep 06, 2012 9:26 am
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Serial Parallel
RMS Peak
wattage ohms
Ohms Law * Murphy's Law
Resistance - Freedom

Life is good :)

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Post subject: Re: While we are on the subject of speaker cabs - Wattage
Posted: Thu Sep 06, 2012 9:50 am
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Toppscore wrote:
Arc-n-spark wrote:
Toppscore wrote:
Art. Interested towards your statement:
Advantages/Disadvantages of Parallel vs Serial?
Safer for the amp? Why?
Tone? Why?
Other advantages or disadvantages?
Just interested. Thank you. Toppscore :)

Reread the posts in this thread to get most of your answers.


Good. Thanks. I will review this thread again to see what I missed.
Take care. Toppscore :)


If you remember that Series is like those cheap Christmas Tree lights, you will notice that if one goes out, they all go out. If they are speakers, then your amp will see an "open" or infinite ohms. This is a very bad thing.

Just edited this to "infinite." A shorted voice coil would produce the 0 ohm situation I quoted earlier.

Art


Last edited by Art1 on Thu Sep 06, 2012 2:28 pm, edited 1 time in total.

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Post subject: Re: While we are on the subject of speaker cabs - Wattage
Posted: Thu Sep 06, 2012 1:48 pm
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Art1 wrote:
Just edited this to "infinate." A shorted voice coil would produce the 0 ohm situation I quoted earlier.

Art


You need to re-edit your post to "infinite". :lol: :lol: :lol:

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Post subject: Re: While we are on the subject of speaker cabs - Wattage
Posted: Thu Sep 06, 2012 2:31 pm
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bluesky636 wrote:
Art1 wrote:
Just edited this to "infinate." A shorted voice coil would produce the 0 ohm situation I quoted earlier.

Art


You need to re-edit your post to "infinite". :lol: :lol: :lol:


Done...

Guess we don't need to mention that impedance changes with frequency and all that technical stuff. Throw in a crossover network and watch the hives break out. 8)

Art


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Post subject: Re: While we are on the subject of speaker cabs - Wattage
Posted: Thu Sep 06, 2012 2:45 pm
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Art1 wrote:
Guess we don't need to mention that impedance changes with frequency and all that technical stuff. Throw in a crossover network and watch the hives break out. 8)

Art


I'm sure you can find a lot about that in Wikipedia. :wink:

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Post subject: Re: While we are on the subject of speaker cabs - Wattage
Posted: Thu Sep 06, 2012 2:52 pm
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I actually tend to go to the ".edu" sites for physics and engineering formulas.

Art


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Post subject: Re: While we are on the subject of speaker cabs - Wattage
Posted: Thu Sep 06, 2012 3:12 pm
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Art1 wrote:
I actually tend to go to the ".edu" sites for physics and engineering formulas.

Art


PM sent.

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Post subject: Re: While we are on the subject of speaker cabs - Wattage
Posted: Thu Sep 06, 2012 10:42 pm
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If you remember that Series is like those cheap Christmas Tree lights, you will notice that if one goes out, they all go out. If they are speakers, then your amp will see an "open" or infinite ohms. This is a very bad thing. Just edited this to "infinite." A shorted voice coil would produce the 0 ohm situation I quoted earlier. Art
===============================


Thanks, Art.
So why serial, ever?
Regarding guitars amps & speakers.

Toppscore :)

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Post subject: Re: While we are on the subject of speaker cabs - Wattage
Posted: Fri Sep 07, 2012 7:10 am
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Art said that some people will put speakers in series for the sake of tone. I'd like to hear more about that but once again if you look at the schematic for this amp you will see the wiring for 6, 4, 2 and one speaker. All the multi speaker hook ups are series/parallel or parallel. Fender obviously did this to protect the amp in the case of a speaker failure.

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Post subject: Re: While we are on the subject of speaker cabs - Wattage
Posted: Fri Sep 07, 2012 7:15 am
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Arc-n-spark wrote:
Art said that some people will put speakers in series for the sake of tone. I'd like to hear more about that but once again if you look at the schematic for this amp you will see the wiring for 6, 4, 2 and one speaker. All the multi speaker hook ups are series/parallel or parallel. Fender obviously did this to protect the amp in the case of a speaker failure.



OK, Arc.
Safety is a major concern for serial at failure.

Potential tone/sound options are a possible plus.
Let's hear from Art about this.

Thanks again, Toppscore

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Post subject: Re: While we are on the subject of speaker cabs - Wattage
Posted: Fri Sep 07, 2012 8:30 am
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Arc-n-spark wrote:
Art said that some people will put speakers in series for the sake of tone. I'd like to hear more about that but once again if you look at the schematic for this amp you will see the wiring for 6, 4, 2 and one speaker. All the multi speaker hook ups are series/parallel or parallel. Fender obviously did this to protect the amp in the case of a speaker failure.


How a speaker/speakers are wired has very little to do with tone (other than the minor impact of possibly different damping factors). Cabinet design has a much greater impact. Two-speaker cabs will sound different depending on whether they are oriented vertically or horizontally due to different dispersion characteristics not because they are wired in series or parallel. Same thing with closed or open back speakers.

8 ohms is the most common speaker impedance. Check any manufacturer and you will find that 8 ohm speakers make up the great majority of speakers they make. Speakers are wired in series, parallel, or series/parallel for impedance matching and power handling concerns, not amp safety. I can have an output transformer that requires a 32 ohm load which is met by four 8 ohm speakers wired in series. Or I can have a output transformer that requires a 2 ohm load which is met by four 8 ohm speakes wired in parallel. Makes no difference.

If wiring speakers in series caused so much concern for amp safety if a speaker fails, no one would make single speaker cabs or combos. Think about it. :wink:

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Post subject: Re: While we are on the subject of speaker cabs - Wattage
Posted: Fri Sep 07, 2012 9:20 am
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Thanks Bill. What happens when a single speaker opens and the amp suddenly has no load?

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Post subject: Re: While we are on the subject of speaker cabs - Wattage
Posted: Fri Sep 07, 2012 9:27 am
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Arc-n-spark wrote:
Thanks Bill. What happens when a single speaker opens and the amp suddenly has no load?


Well, hopefully one is smart enough and quick enough to shut the amp down before any damage is done. :lol:

That's why the speaker should be rated higher than the amount of power the amp is capable of putting out. :wink:

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