I've been doing some 2-way speaker designs over the past couple of days. I had some questions about speaker nominal impedance and compatibility with my AV receiver.
In my first design with these speakers, I wired 2-ohm woofers in parallel and wired those in parallel with a 4-ohm tweeter. Here are the resulting Frequency Response, Crossover Design, and Impedance graphs:
I currently own an ONKYO TX-NR609 receiver which is rated down to 6 ohms and can go lower, but the protection circuit may be activated. This impedance graph gets down to 1.8 ohms at around 600hz which to me seems ridiculous, and it would definitely not work for my receiver.
I really wanted to use these drivers, so I decided to just play around to see what happened to the impedance graph in different wiring configurations. I wired the woofers in series (16 ohm) in parallel with the tweeter. Here are the resulting Frequency Response, Crossover Design, and Impedance graphs:
Heres the real questions I have:
In the first graph what would the nominal impedance be considered? 4 ohms? I'm just surprised at how low it goes.
In the second graph, what would the nominal impedance be considered there? I've tried searching to see what people say online, and I've watched a couple of youtube videos. One YouTuber says the nominal impedance should be the impedance of the woofers which should be 16 ohms. It looks to me more like 6 ohms? Is it the crossover that is lowering impedance that much?
Is there anything that makes a certain impedance graph better than others?
When it comes to powering a speaker with a lower impedance than an amp is rated for, what happens? I've looked all over the internet and everything I see is that it will damage the amp. Would this not allow the amp to overpower the speakers more easily if the rated power of the speakers was less than the amp was capable of? To me, it seems that the speakers would be at a higher risk of being damaged.
In my first design with these speakers, I wired 2-ohm woofers in parallel and wired those in parallel with a 4-ohm tweeter. Here are the resulting Frequency Response, Crossover Design, and Impedance graphs:
I currently own an ONKYO TX-NR609 receiver which is rated down to 6 ohms and can go lower, but the protection circuit may be activated. This impedance graph gets down to 1.8 ohms at around 600hz which to me seems ridiculous, and it would definitely not work for my receiver.
I really wanted to use these drivers, so I decided to just play around to see what happened to the impedance graph in different wiring configurations. I wired the woofers in series (16 ohm) in parallel with the tweeter. Here are the resulting Frequency Response, Crossover Design, and Impedance graphs:
Heres the real questions I have:
In the first graph what would the nominal impedance be considered? 4 ohms? I'm just surprised at how low it goes.
In the second graph, what would the nominal impedance be considered there? I've tried searching to see what people say online, and I've watched a couple of youtube videos. One YouTuber says the nominal impedance should be the impedance of the woofers which should be 16 ohms. It looks to me more like 6 ohms? Is it the crossover that is lowering impedance that much?
Is there anything that makes a certain impedance graph better than others?
When it comes to powering a speaker with a lower impedance than an amp is rated for, what happens? I've looked all over the internet and everything I see is that it will damage the amp. Would this not allow the amp to overpower the speakers more easily if the rated power of the speakers was less than the amp was capable of? To me, it seems that the speakers would be at a higher risk of being damaged.
Have you calculated the sensitivity of those 2 woofers when hooked in parallel and the sensitivity when hooked in series ?
Speaker sensitivity spec is 87.7db. For series there is a 3db increase, and in parallel there is a 6db increase. You can see it in the spl graphs for each crossover design.
Deffinitly use them in series. Overpowering won't happen. And using 4ohm drivers is not really a good id when the amp can't do 4ohm nominal as the impendance will always be to low or to close to too low.
nominal impedance is the minimum value in the range above the low resonance usually between 100 and 300Hz in your case 500Hz.
2 ohm for the woofers and 3 for the tweeter. not good for a 4 ohm specified amp
low 4 ohm woofer, 3.5 tweeter good for a 4 ohm specified amp
Why that? because the amp has to deliver more current to low impedance
eventually it can burn out or hopefully shuts down before.
2 ohm for the woofers and 3 for the tweeter. not good for a 4 ohm specified amp
low 4 ohm woofer, 3.5 tweeter good for a 4 ohm specified amp
Why that? because the amp has to deliver more current to low impedance
eventually it can burn out or hopefully shuts down before.
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What is causing the second impedance graph to dip all the way down to 4 ohms? The woofers are 2 8 ohm speakers in series. Shouldn't the impedance graph below the crossover frequency be somewhere around 16 ohms?