Ohms affect sound? Yes or no?
This is a tangent (for big reds amusement):
From Wikipedia-Inductance (L) (measured in henries) is an effect resulting from the magnetic field that forms around a current-carrying conductor that tends to resist changes in the current. Electric current through the conductor creates a magnetic flux proportional to the current. A change in this current creates a change in magnetic flux that, in turn, by Faraday's law generates an electromotive force (EMF) that acts to oppose this change in current. Inductance is a measure of the amount of EMF generated for a unit change in current. For example, an inductor with an inductance of 1 Henry produces an EMF of 1 volt when the current through the inductor changes at the rate of 1 ampere per second. The number of loops, the size of each loop, and the material it is wrapped around all affect the inductance. For example, the magnetic flux linking these turns can be increased by coiling the conductor around a material with a high permeability such as iron. This can increase the inductance by 2000 times, although less so at high frequencies.
Thus: Inductance is a factor of the MAGNETIC field, the stronger the magnetic field the more energy is stored in the form of EMF that will oppose a change in I flow. Thus the more I the stronger the field, the more turns in an inductor the larger the field.
Back to topic: By going from serial (8ohm) to parallel (2 ohm) coils you altered R (thus increasing I flow) and also by adding parallel inductors (voice coils) lowered the system L and nominally increased system capacitance. So we have fewer inductor turns and more I. So if there were to be a change in sound quality it is due to the change in the load (subwoofer) not the source (amplifier) and given the limited freq band would tend to mask any differences, also the amplifier would also mask differences due to its high speed voltage and current regulation.
v=2 (Pi) FL x I x cos (2(Pi)x Ft)
I think this works with Lenz, ampere, Kirchhoff
And the complexity of the CEMF is why damping factor decreases with current
From Wikipedia-Inductance (L) (measured in henries) is an effect resulting from the magnetic field that forms around a current-carrying conductor that tends to resist changes in the current. Electric current through the conductor creates a magnetic flux proportional to the current. A change in this current creates a change in magnetic flux that, in turn, by Faraday's law generates an electromotive force (EMF) that acts to oppose this change in current. Inductance is a measure of the amount of EMF generated for a unit change in current. For example, an inductor with an inductance of 1 Henry produces an EMF of 1 volt when the current through the inductor changes at the rate of 1 ampere per second. The number of loops, the size of each loop, and the material it is wrapped around all affect the inductance. For example, the magnetic flux linking these turns can be increased by coiling the conductor around a material with a high permeability such as iron. This can increase the inductance by 2000 times, although less so at high frequencies.
Thus: Inductance is a factor of the MAGNETIC field, the stronger the magnetic field the more energy is stored in the form of EMF that will oppose a change in I flow. Thus the more I the stronger the field, the more turns in an inductor the larger the field.
Back to topic: By going from serial (8ohm) to parallel (2 ohm) coils you altered R (thus increasing I flow) and also by adding parallel inductors (voice coils) lowered the system L and nominally increased system capacitance. So we have fewer inductor turns and more I. So if there were to be a change in sound quality it is due to the change in the load (subwoofer) not the source (amplifier) and given the limited freq band would tend to mask any differences, also the amplifier would also mask differences due to its high speed voltage and current regulation.
v=2 (Pi) FL x I x cos (2(Pi)x Ft)
I think this works with Lenz, ampere, Kirchhoff
And the complexity of the CEMF is why damping factor decreases with current
Like I said, discussions like this used to happen when a few guys got together at a show or at the local Timmy's to yack about audio....now they happen online and the info is available to a larger audience.....which is a good thing......
I have never pretended to know everything about this stuff, my Dad is an electrical engineer and I had tons of theory taught to me as a kid......having forgotten a fair bit of it over the years I still like to see that there are people out there who know how it applies to car audio and will share that info when the subject comes up. I learn something new every install I do and I still love doing it, if places like this do nothing but help every person who wants to know learn as much as they want to know, they have served their purpose....
IMHO, enclosure design plays at least as much of a role in cone control as amplifier design.....balancing all those different factors into designing the system is what makes it frustrating as hell and exhilarating when you get it right.....
50 Watt CAFz'r
Joined: May 2007
Posts: 384
I would say yes for that sub on that amp and here's why. If you run the sub in a 2 ohm configuration you will have more power and all the other good stuff that we like when a sub is driven with it's RECOMMENDED power. If you run it in a 8ohm configuation most people will crank the gain just that little bit more to get a little more output. As we crank the gain and/or the bass boost we introduce more and more distortion which will decrease the sound quality for sure. However you can't really compare 8ohms to 4 ohms in this respect because that is precisly what determines how much power the sub will get. The more power up to and even a little bit beyond it's recommend power handling(with no clipping of course)will give you a better controlled sub which will have better sound quality. With that amount of power difference you should be able to hear the differance even with our pot hole riddin roads in the GTA.LOL!
500 Watt CAFz'r
Joined: Jan 2008
Posts: 537
- That the field strength is proportional to the current and the number of windings? The coil dimensions come into play of course but in this case it's fixed.
- That energy is stored in the field only.
- Inductance is the resistance to change in the field, and therefore the current. It is not proportional to the current, but rather fixed by the coil parameters. (Without saturation of course)
- That low reactance loads are easier to drive, not that it matters since modern amps generally have a high damping factor.
- That we are splitting hairs here and it's damn fun.
500 Watt CAFz'r
Joined: Jan 2008
Posts: 537
I would say yes for that sub on that amp and here's why. If you run the sub in a 2 ohm configuration you will have more power and all the other good stuff that we like when a sub is driven with it's RECOMMENDED power. If you run it in a 8ohm configuation most people will crank the gain just that little bit more to get a little more output. As we crank the gain and/or the bass boost we introduce more and more distortion which will decrease the sound quality for sure. However you can't really compare 8ohms to 4 ohms in this respect because that is precisly what determines how much power the sub will get. The more power up to and even a little bit beyond it's recommend power handling(with no clipping of course)will give you a better controlled sub which will have better sound quality. With that amount of power difference you should be able to hear the differance even with our pot hole riddin roads in the GTA.LOL!
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