All would-be audiophiles, audio system integrators, technicians, professionals etc., are required to possess the knowledge to answer the basic questions asked in the drawing below.
Give it a try - record your answers, and in a few day's I'll post the correct answers and you can compare your answers to mine... After which, if some of you desire to understand the Laws and formulas I used to determine my answers, I'll be glad to walk you through them...
All would-be audiophiles, audio system integrators, technicians, professionals etc., are required to possess the knowledge to answer the basic questions asked in the drawing below.
Give it a try - record your answers, and in a few day's I'll post the correct answers and you can compare your answers to mine... After which, if some of you desire to understand the Laws and formulas I used to determine my answers, I'll be glad to walk you through them...
Hmmm....I'd say all would-be audiophiles, audio system integrators, technicians, professionals etc., are required to possess the knowledge know that it ain't just about the resistive component of a load.
A more interesting discussion would stem from the question, what source impedance does a speaker in a series branch see?
You should probably explain, for the class, what you mean by 8-ohm stable. Then go on to explain why that would be a useless amp out in the wild.
Hmmm....I'd say all would-be audiophiles, audio system integrators, technicians, professionals etc., are required to possess the knowledge know that it ain't just about the resistive component of a load.
A more interesting discussion would stem from the question, what source impedance does a speaker in a series branch see?
You should probably explain, for the class, what you mean by 8-ohm stable. Then go on to explain why that would be a useless amp out in the wild.
Well this discussion is clearly about the primary application Ohms-Watt's & Kirchhoff Laws, within Series & Parallel Networks. The exercise has been created to evidence many relationships and to set ones eyes upon the most common applications for such, out in the field; along with the common pitfalls...
So hold off on the irrelevant essay and just make an attempt at answering the questions, and post them for us all to review; then I'll grade your effort. If you pass, I'll know you have a clue, then I'll gladly enter into a discussion about what you deem to be more interesting:source impedance, and the other hay, you stacked up; in a new thread of your own creation of course; as this thread is mine!
If you fail, I will kindly show you the location of your errors, and offer correction; either way, you win!
You're implying that speakers are simple resistors, which is never the case. You want to do something that really helps people out? Stick to realistic real-world examples (a 2 ohm resistive speaker, an "8 ohm stable" amplifier...really?).
I don't know what makes you think it's up to you to condescend to everyone and "teach" them, but if you insist, please teach them properly with accurate and realistic examples and questions. "What's the total wattage the amplifier is outputting?" Aside from marks off for grammar, how the heck would anyone know? You've provided no information on the Brand X amp besides what appears to be the capability of driving 30 volts into 8 ohms. What possible bearing would that have on your "circuit"? How would anyone know what the amp would do into a 1.03 ohm purely resistive speaker...if such a thing did actually exist? Is the amp stable at that load? How should anyone know? It's stable at 8, is it at 1.03? Is an amp that is stable at 8 instantly unstable at 7.9? When it becomes unstable, what happens? Does it oscillate, shut down, burn up, accelerate to 88 miles per hour, vibrate then explode? What's the amp's source impedance? Zero? And if so, where can I get me one of them...a pure voltage source with infinite current capability? If the amp is unstable below 8 ohms, and breaks into oscillation because of the instability, what kind of power will it provide the load? With a zero source impedance, will it just do the theoretical 873 watts or go nuts and oscillate at 2MHz and deliver a couple of kilowatts? Or does that Brand X Super Amp actually have a current limit to it, or a maximum output power, or a non-zero source Z? Or will it blow an output device and morph from an amplifier to a block of scrap metal?
What any audiophile or custom installer really needs to know here is "don't ever attempt this in the real world". And if you do, don't expect your results to match your calculations because they will be miles off.
Your examples are ridiculous, misleading, and absurd. It won't educate anyone, it will confuse and mislead them. Of course, a few who look very carefully at your "schematic" will notice that not a single speaker is actually connected to the amp. So no power is delivered, the load is infinite, and the amp is probably stable. The resistive load of each speaker is infinite, the voltage at each speaker is zero, the current is zero and power ("wattage" is an incorrect colloquialism for "power") is zero. Was it a trick test or just badly drawn?
Your "test" receives an F for poor construction.
I respectfully request a 20dB arrogance filter with a break point slightly before your first post in this thread.
The Title of the Thread is Series Parallel Calculations - not sure how you keep missing this fact!
So this discussion is clearly about the primary application Ohms-Watt's & Kirchhoff Laws, within Series & Parallel Networks. The exercise has been created to evidence many relationships and to set ones eyes upon the most common applications for such, out in the field; along with the common pitfalls...
Therefore it's my intention "After which, if some of you desire to understand the Laws and formulas I used to determine my answers, I'll be glad to walk you through them..." In other words teach Ohms-Watts & Kirchhoff's Laws, as well as how to calculate circuit impedance in Series, Parallel and Series-Parallel networks, using nominal load depictions. It's a requisite 101 entry point to the fundamentals of electronic circuit design. - A first of many building blocks... One must walk before they can run!
So hold off on the continuous development of straw man protests and just make an attempt at answering the questions, and post them for us all to review; then I'll grade your effort. If you pass, I'll know you have a clue, then I'll gladly enter into a discussion about what you deem to be more interesting and appropriate:source impedance, and the other hay, you stacked up; in a new thread of your own creation of course; as this thread is mine!
If you fail, I will kindly show you the location of your errors, and offer correction; either way, you win! :kiss:
Sigh, ok, one more just to take you by the hand, since you clearly don't get it.
In your "test" there can be no correct answers for these questions:
1. What is the Load the amplifier sees? - because we don't know for sure if the speakers are connected. Even if you calculate the actual load, that could be wrong because they may not be connected. Otherwise, assuming they are connected, my answer was already posted.
2. Is the amplifier stable at this load? - Sorry, not enough information about the amp. You can answer yes, or no, and be wrong when more info is provided.
3. What is the Total "Wattage" the Amplifier is Outputting? - Again, no correct answer is possible. Is it a theoretical voltage source? What is meant by "8-ohms stable"? Sorry, there cannot be a correct answer, so any answer will be wrong. The term "wattage" should be replaced by "power", unless you want to also use "amperage" and "resistage". Good technical teaching involves the avoidance of colloquial terminology.
4. Each of the Parallel Branch questions has issues related to the above. We cannot know any of it unless we also know what happens to the amp below 8 ohms, and if any speakers, in fact, actually connected at all.
5. Each of the Series Branch questions has issues related to the above. We cannot know any of it unless we also know what happens to the amp below 8 ohms, and if any speakers, in fact, actually connected at all.
In short, the entire thing is either a rookie attempt at teaching, an effort at self aggrandizement or a trap/trick designed to make others feel stupid. This is no way to share knowledge or "teach" someone. You could just fix it and try again, which might actually gain you respect rather than continue to be condescending.
I promise, I will unsubscribe, but since I haven't seen a good tap-dance in a long while, I'll wait one more round.
Sigh, ok, one more just to take you by the hand, since you clearly don't get it.
In your "test" there can be no correct answers for these questions: WRONG - Utterly false statement!
1. What is the Load the amplifier sees? - because we don't know for sure if the speakers are connected. Even if you calculate the actual load, that could be wrong because they may not be connected. Otherwise, assuming they are connected, my answer was already posted. - WRONG - perversion of context! LOL... Of course their connected... I posted approximately 40-questions/calculations. Your limited attempts at answering have been ultra incomplete and largely incorrect; gaining you an 'F'!
2. Is the amplifier stable at this load? - Sorry, not enough information about the amp. You can answer yes, or no, and be wrong when more info is provided. - WRONG - assumptive prediction of context, enough data will be present, as the calculations unfold!
3. What is the Total "Wattage" ('that' - you keep misquoting me, then accuse me of poor grammar, based on your misquote - you keep missing the word 'that') the Amplifier is Outputting? - Again, no correct answer is possible. Is it a theoretical voltage source? What is meant by "8-ohms stable"? Sorry, there cannot be a correct answer, so any answer will be wrong. The term "wattage" should be replaced by "power", unless you want to also use "amperage" and "resistage". Good technical teaching involves the avoidance of colloquial terminology (LOL - like the word: "resistage"?). - WRONG - your reaching as to form speculative contexts. Also, the total output Wattage capabilities of the amplifier, can be estimated using the results from preforming all of the calculations, as will be proved shortly.
4. Each of the Parallel Branch questions has issues related to the above. We cannot know any of it unless we also know what happens to the amp below 8 ohms, and if any speakers, in fact, actually connected at all.- WRONG - you are missing the point of the exercise - or just simply perverting it for sport! You keep challenging me before I present the answers, and the full framework of their context. You should have stayed your comments until after I presented the answers. All of the questions can and will be answered, within the context that they have been presented.
5. Each of the Series Branch questions has issues related to the above. We cannot know any of it unless we also know what happens to the amp below 8 ohms, and if any speakers, in fact, actually connected at all. - WRONG - you are missing the point of the exercise - or just simply perverting it for sport!You keep challenging me before I present the answers, and the full framework of their context. You should have stayed your comments until after I presented the answers. All of the questions can and will be answered, within the context that they have been presented.
In short, the entire thing is either a rookie attempt at teaching, an effort at self aggrandizement or a trap/trick designed to make others feel stupid. This is no way to share knowledge or "teach" someone. You could just fix it and try again, which might actually gain you respect rather than continue to be condescending. - WRONGagain, there's nothing to fix and you're simply describing your efforts in here, not mine... My goodness, I just posted some questions and you're all over me, before I presented my answers, if that's not 'self aggrandizement', then what is?
I promise, I will unsubscribe, but since I haven't seen a good tap-dance in a long while, I'll wait one more round. - Ah the truth - you're looking for a fight!
Now the answers to the questions that I presented!
As the tile of this thread suggests, the answers to these questions are rooted in the understanding of Series Parallel Calculations; however, one must also have a complete understanding of Ohms-Watt & Kirchhoff’s Law’s, to answer them all!
The mechanics, if you will; required in answering the questions that I have posted, are identical to those used in every circuit, of every electronic device, ever produced. If you can answer these questions, you have a requisite understanding of 101 electronic principles.
The ‘Exercise’ that I have posted was taken out a 12-week college level program, which typically took 3-weeks to acclimate students, to a level of understanding, to correctly answer these questions. The ‘Exercise’ was presented on the backside of a lecture, as such; the context was framed more concretely then these standalone pictures afford, on their own. However, after I provide the answers, I will reverse engineer the mathematics at play, as to solidify the framework. It is my honest desire to provide a clear path to the understanding of these Law's, because without such understandings, one cannot possess a legitimate footing, in this forum of debate and general discussion, and absolutely not as a would-be professional within any of the AV technical verticals of specialization.
For those of whom that already 'know' this stuff, a review/exercise of such knowledge never hurts, it sharpens the pencil, if you will.
If you don’t know the formulas for Series, Parallel or Series Parallel calculations, you will not be able to answer any of these questions, if you don’t know Ohms-Watts & Kirchhoff’s Laws, you will not be able to answer much if any of these questions, if you cannot properly interpret the drawing, you will also have minimal to no success. By ‘know’ I mean to suggest a complete level of understanding…
These questions are based purely on mathematics, therefore there is no disputing their answers, within the context that I have presented them.
This is merely a 101 ‘Exercise’ to illustrate and therefore teach useful formulations and relationships, which all modern electronics are founded upon. - It further pushes one to consider the power supply / amplifiers abilities, before developing a network, teaching one how to calculate theoretical loads and such, before their connection to an amplifier. - As this exercise will demonstrate, failing to do so will have all kinds of undesirable outcomes.
1. - Amplifier Shut-down, or Complete Failure
2. - Driver or Passive Crossover Component Failures
3. - Unwarranted Imbalances in Acoustic Output Levels 4. And a host of other lesser Sins..!
Below, you will note a completed worksheet, full of numbers based on the science that I noted above. From these numbers, all of the questions that I presented can be answered.
I have placed the completed worksheet in a ’spoiler’ for those of you whom that are making a legitimate effort at answering the questions.
After a few days, perhaps more, as time affords, I will begin explaining/teaching Ohms-Watts & Kirchhoff’s Laws, alongside of Series, Parallel Series Parallel calculations and how to recognize them within a schematic/drawing.
I will share this one simple fact at this time – as a clue, for those of whom requiring it: from two electrical knowns (P/E/I/R/), all other factors can be calculated within this electronic circuit. I have directly provided those two knowns: Ohms-Watts & Kirchhoff's Laws will provide the rest.
Answers have been wrapped in spoilers, for those still working on the questions:
In viewing the calculations above, we can now move forward in answering the questions presented. We can also see patterns at work, which evidence Ohm-Watt’s & Kirchhoff’s Laws!
Parallel Branch Question:
What is the Resistive Load of the Parallel Branch?
Answers & Hint:
1st Reduction: 1.0666-Ohms
What is the Voltage at Each Speaker?
Answers & Hints:
Parallel:
R1:
30 Volts – Kirchhoff’s law tells us that the Voltage within Parallel Branches is equal to the Voltage of the Power Supply. I have depicted the power supply to maximally supply 30-Volts.
R2:
30 Volts – Kirchhoff’s law tells us that the Voltage within Parallel Branches is equal to the Voltage of the Power Supply. I have depicted the power supply to maximally supply 30-Volts.
R3:
30 Volts – Kirchhoff’s law tells us that the Voltage within Parallel Branches is equal to the Voltage of the Power Supply. I have depicted the power supply to maximally supply 30-Volts.
R4:
30 Volts – Kirchhoff’s law tells us that the Voltage within Parallel Branches is equal to the Voltage of the Power Supply. I have depicted the power supply to maximally supply 30-Volts.
What is the Current at Each Speaker?
Answers & Hints:
Parallel:
R1:
15 Amps – Ohms/Watts Law tells us that the current at each resistor is based on the Voltage divided by the Resistance. Since these values are known to us, we can solve all other unknowns.
R2:
7.5 Amps – Ohms/Watts Law tells us that the current at each resistor is based on the Voltage divided by the Resistance. Since these values are known to us, we can solve all other unknowns.
R3:
3.75 Amps – Ohms/Watts Law tells us that the current at each resistor is based on the Voltage divided by the Resistance. Since these values are known to us, we can solve all other unknowns.
R4:
1.875 Amps – Ohms/Watts Law tells us that the current at each resistor is based on the Voltage divided by the Resistance. Since these values are known to us, we can solve all other unknowns.
What is the Wattage at Each Speaker?
Answers & Hints:
Parallel:
R1:
450 Watts – Ohms/Watts Laws tell us that with as little as two knowns, that all other knowns can be solved. I have supplied two knowns, and Kirchhoff’s Laws, provide us with some additional efficiencies in making such calculations.
R2:
225 Watts – Ohms/Watts Laws tell us that with as little as two knowns, that all other knowns can be solved. I have supplied two knowns, and Kirchhoff’s Laws, provide us with some additional efficiencies in making such calculations.
R3:
112.5 Watts – Ohms/Watts Laws tell us that with as little as two knowns, that all other knowns can be solved. I have supplied two knowns, and Kirchhoff’s Laws, provide us with some additional efficiencies in making such calculations.
R4:
56.25 Watts – Ohms/Watts Laws tell us that with as little as two knowns, that all other knowns can be solved. I have supplied two knowns, and Kirchhoff’s Laws, provide us with some additional efficiencies in making such calculations.
Series Branch Questions:
What is the Resistive Load of the Series Branch?
Answer & Hint:
Second Reduction: R= 30-Ohms
What is the Voltage at Each Speaker?
Answers & Hints:
Series:
R1:
2 Volts - Ohms/Watts/Kirchhoff's Laws guide us to this answer.
R2:
4 Volts – Ohms/Watts/Kirchhoff’s Laws guide us to this answer.
R3:
8 Volts – Ohms/Watts/Kirchhoff’s Laws guide us to this answer.
R4:
16 Volts – Ohms/Watts/Kirchhoff’s Laws guide us to this answer.
What is the Current at Each Speaker?
Answers & Hints:
Series:
R1:
1 Amp – rounded for clarity in illustrating relationships; Ohms/Watts/Kirchhoff’s Laws guide us to this answer.
R2:
1 Amp – rounded for clarity in illustrating relationships; Ohms/Watts/Kirchhoff’s Laws guide us to this answer.
R3:
1 Amp – rounded for clarity in illustrating relationships; Ohms/Watts/Kirchhoff’s Laws guide us to this answer.
R4:
1 Amp – rounded for clarity in illustrating relationships; Ohms/Watts/Kirchhoff’s Laws guide us to this answer.
What is the Wattage at Each Speaker?
Answers & Hints:
Series:
R1:
2 Watts - Ohms/Watts/Kirchhoff’s Laws guide us to this answer.
R2:
4 Watts - Ohms/Watts/Kirchhoff’s Laws guide us to this answer.
R3:
8 Watts - Ohms/Watts/Kirchhoff’s Laws guide us to this answer.
R4:
16 Watts - Ohms/Watts/Kirchhoff’s Laws guide us to this answer.
Amplifier Questions:
What is the Load that the Amplifiers sees?
Answers & Hints:
Final Reduction: Ohms/Watts/Kirchhoff’s Laws guide us to this answer.
R = 1.03004 – within .1% of accurate based on provided values, an occurrences of ‘rounding’
Is the Amplifier Stable at this load?
Answers & Hints:
Ohms Law Calculation: Ohms/Watts/Kirchhoff’s Laws guide us to this answer.
In the drawing, the amplifier/power supply is depicted as being 8-ohm stable, meaning that when experiencing a nominal 8-Ohm load, that it will remain functional, as intended by design. Applying nominal loads below 8-Ohms however, no guarantee of stability is presented.
***Note: Nominal Load is a term used to describe/depict a likely average load that an amplifier will see during operation, it isn't meant to suggest a constant load, as such; at varying frequencies the load will in fact rise above and fail below 8-Ohms. Nominal Amplifier & Speaker Ratings fall into linear progressions of classification: 8; 6; 4; 2; 1, as an example... Therefore, an Amplifier rated by the manufacturer @ 8-Ohm stability, means to suggest stability at levels as high as max output; at lower output levels, they may in fact remain stable into lower loads, but no guarantee is provided and ones warranty is voided! One should assume instability when an amplifier is interconnect to a network with a nominal load estimate below the manufacturers rating***
Ohms/Watts Laws tell us that each time the load is halved that the current present doubles. Our power supply is rated to support 30-Volts at 8-Ohms. With these two knowns we can calculate the remaining factors: P & I. I = E/R, in this case = 3.75 Amps; P = E x I, in this case = 112.5 Watts.
P= 112.5 - Watts
E = 30 - Volts
I = 3.75 - Amps
R = 8 - Ohms
In order for this 30-Volt power supply to meet the current demands of this 1-Ohm nominal circuit @ 873.75- Watts, it would have to produce a sustainable, useable flow of 29.125 Amps. This sum is 7.7666 time greater than the 3.75 Amp rating of the amplifier. No amplifier ever produced has been capable of exceeding its stable current production by such a magnitude.
So obviously, when viewing the load resistance, noted within the Final Reductions, it is made clear that this circuit will present approximately a 1-Ohm nominal load to this amplifier, a load that is 1/8th of what has been depicted as being stable, a load that demands 7.7666 times more amps than the depicted supply capability, and a factor of headroom that simply doesn't exist, in any product with such energy credentials. Requisite data to possess!
However, would-be DIY types, integrators and the alike, wire networks with such demands everyday, somewhere in the world and when things don't work or start to burn, they scratch there heads and ultimately, blame the someone else, usually the manufacturer... ***When it should have been obvious that the network wasn't designed appropriately for the amplifier, or that the amplifier was the wrong choice for implementation and interconnection within the speaker network.***
Therefore the answer can ONLY be NO!
(For fun, take your AVR's Wattage rating and calculate the SQRT of the (Wattage rating divided it by the rated stability - usually 8-Ohms), and you will gain a current score (I), take the current score and multiply it by the rated stability (R) and you will also have the Voltage score. In this way you will know all four factors: P/E/I/R.)
What is the Total Wattage that Amplifier is Outputting?
Answers:
Final Reduction:
As proven above, this amplifier / power supply cannot support the nominal impedance that this circuit would present (as calculated in the Final Reduction), as such, the amplifier would reel back it’s Voltage output or shut down and produce no Wattage, or perhaps even start a fire!
Zero is the ONLY probable answer, at the estimated nominal load of 1-Ohm!
This is a prime reason why all would-be DIY’ers, Installers, etc., etc., etc., must come to a complete understanding of Ohm’s-Watts & Kirchhoff’s Laws. Circuit failures due to the lack of appropriate design considerations are simply inexcusable, IMO. It’s simply a requisite, baseline knowledge that in its absence: misapplications and related mishaps will and do occur!
One cannot legitimately label themselves a professional if they don't 'know' this science, and correctly implement without fail!
Additional Question:
Can each respective speaker handle the Wattage being demanded by the load, if the amplifier was capable of delivering it!
Answers:
Parallel:
I have set the Wattage rating for the speaker’s at 50-Watts, respectively.
R1:
450-Watts – Answer: No
R2:
225-Watts– Answer: No
R3:
112.5 Watts– Answer: No
R4:
56.25 Watts– Answer: No
Series:
I have set the Wattage rating for the speaker’s at 50-Watts, respectively.
R1:
2 Watts – Answer: Yes
R2:
4 Watts – Answer: Yes
R3:
8 Watts – Answer: Yes
R4:
16 Watts– Answer: Yes
All of the answers were derived from no more than two knowns, and a complete understanding of Ohms-Watts & Kirchhoff’s Laws!
If you require and desire such understandings, I will gladly assist you in attaining them. I ask but the following in return; that your questions have relevant merit and be presented politely. Any attempts to pervert the context of my postings, regardless of how politely they're presented, will be ignored, moving forward...
I will be proceeding as follows:
1. - Overview of Basic Circuit Topology 101 2. - Introduction to the basic Factors of Energy 3. - A Review of the Basic factors of Energy as they relate to:
a)Ohms Laws
b) Watts Laws
c) Kirchhoff’s Laws 4. - Introduction to Identifying and Calculating Loads in Series Circuits 5. - Introduction to Identifying and Calculating Loads in Parallel Circuits 6. - Introduction to Identifying and Calculating Loads in Series Parallel Circuits
I will take my time and offer solid explanations and drawings, as time affords.
This is all from the first few weeks of basic electronics. I haven't the desire to work it out to prove I've been there, boring. OTOH, if you want to teach, post some instruction. I don't see the point of posting a test to see if you can trick people who don't have the skill into posting wrong answers. Those that know, know and this is pretty basic stuff. If people don't know, they don't know and volunteering to be embarrassed on public forum doesn't sound like much fun.
BTW, I have read enough magazines and been on enough fora to know that audiophiles don't need to know this stuff. Professional reviewers usually don't.
What happens when an "audiophile" decides to build their own speakers, install their own home theater and buy all of their own components without knowing this? You would be amazed by the bad work done by electrical engineers and other people who should either know what they're doing or should realize their limitations.
This info SHOULD be known by anyone who wants to dig deeper into this area and it doesn't matter if they're a hobbyist or trying to get into the business. The sad fact is, far too many people who ARE in the audio business don't know this stuff. I worked with someone who strutted around, saying "They (sales) sell the dream, I make it happen", but he didn't know how to calculate a resistive load. We went to CEDIA and were to attend one of the Installer training sessions. He had installed for a while, but didn't have the electrical training to KNOW what he was wiring or why it would/wouldn't work. We were given 2 hours for the 200 question test- I got up to leave after 40 minutes, having checked my answers twice. He looked at me and asked, "Give up already?". I was confident that I had done well. He, OTOH, walked into the restaurant after the full two hours and looked like he had been rode hard & put away wet. I looked over and asked "Give up already?". He was NOT happy.
He never did tell me how he scored, just said "Yeah, that's about what I got" when I told him I had scored an average of 93 on the four sections. Then, he had the gall to blame me for wiring the butkickers in the owner's theater wrong, when he was lead installer for that day and I had asked specifically about the load. He just barked "Just do it the way I did the other ones!".
So, @audio2xs gets the same net result (1.03 ohms) as you, and he's still wrong? But, only because he didn't assume that the "30V 8ohm stable" text was the bit of information he should have used to attain the current capabilities of the amplifier.... You two need to kiss and make up, lol.
Anyway, unless installing a large multi-speaker setup (whole-home audio, maybe), or maybe a DIY sub guy wiring many drivers in series-parallel to optimize the load, I'm not sure the typical audiophile needs to know this stuff. The latter probably already does, as it's pretty easy to remember the computations for series and parallel circuits. Anyone setting up a normal system would never be dealing with this.
Moreover, unless I'm reading your graphic wrong, wouldn't this be a very sub-optimal setup? I mean, for starters, that's a lot mismatched speakers. But, it also doesn't seem like they are wired together very well.... A better use of series-parallel by groups of similar impedance speakers would work better, no? I suppose I'm saying that this example seems pretty contrived; would anyone actually wire things like that?
So, @audio2xs gets the same net result (1.03 ohms) as you, and he's still wrong? But, only because he didn't assume that the "30V 8ohm stable" text was the bit of information he should have used to attain the current capabilities of the amplifier.... You two need to kiss and make up, lol.
Anyway, unless installing a large multi-speaker setup (whole-home audio, maybe), or maybe a DIY sub guy wiring many drivers in series-parallel to optimize the load, I'm not sure the typical audiophile needs to know this stuff. The latter probably already does, as it's pretty easy to remember the computations for series and parallel circuits. Anyone setting up a normal system would never be dealing with this.
Moreover, unless I'm reading your graphic wrong, wouldn't this be a very sub-optimal setup? I mean, for starters, that's a lot mismatched speakers. But, it also doesn't seem like they are wired together very well.... A better use of series-parallel by groups of similar impedance speakers would work better, no? I suppose I'm saying that this example seems pretty contrived; would anyone actually wire things like that?
All would be sentient beings are required to make all significant knowledge freely available to all, least they suffer the wrath of the galactic overlord.
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