Ok, I see. However, the purpose of my mod is to remove some mid-bass from the output spectrum, the bass boost would be outgrowth.
Actually, I trusted the result of simulation because it's consistent with the real listening test. These speakers if using without loudness function or tone controls will sound relatively flat. That means they have modest bass, prominent midrange and outstanding treble, which is according to the hearing curve of human, unlike many speakers in the market that will have prominent bass, reduced mid, and mild treble.
I am a very strong proponent of this > but SOMETIMES DCR of an inductor can actually provide a function.
No, I have barely scratched the surface of my installed Xsim program, BUT aren't those "measured driver parameters" those provided by manufactures
that don't necessarily cover all the aspects of a drivers sound? EG. a simple series R/C zobel across a woofer for FLAT impedance may not actually be best.
"In order for textbook passive crossover filters to work as expected you need to meet the conditions they were designed for, namely a zero output impedance source and a fixed impedance load. "
Being a "proponent of this" is totally missing the point. I'm stating the fact that most all of the filter design tools and formulas for calculating passive crossover filters are based on the assumption that the filter is connected to a zero impedance source. If it is not the filter cut off frequency and Q will simply be different..
Xsim does not use TS parameters, It uses measurements of the magnitude and phase frequency as .frd files and the impedance vs. frequency as .zma files. Those can sometimes be loaded from the manufacturer or they are best measured from the drivers once they are in the baffle. So it can be as accurate as you want it to be. It is very simple to use. Give it a try.
Being a "proponent of this" is totally missing the point. I'm stating the fact that most all of the filter design tools and formulas for calculating passive crossover filters are based on the assumption that the filter is connected to a zero impedance source. If it is not the filter cut off frequency and Q will simply be different..
Xsim does not use TS parameters, It uses measurements of the magnitude and phase frequency as .frd files and the impedance vs. frequency as .zma files. Those can sometimes be loaded from the manufacturer or they are best measured from the drivers once they are in the baffle. So it can be as accurate as you want it to be. It is very simple to use. Give it a try.
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Yes > but you do realize that "zero impedance source" is a 'Theoretical Ideal' and not a practical reality. But you are correct that F & Q are what stray.
My strong 'proponentsy' regards amplifiers with VERY LOW output impedance and hence VERY HIGH damping factor > just like my beloved M-1400.
And yes again, I should get my head into Xsim 🙂
PS.
All the speakers I have designed & built to date have used NO software with the exception of a Spectrum Analyzer > just calculus, measurement + ears.
[ this is another reason why I like an amplifier that is not a limiting factor > 2ohms > not a problem ]
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You might enjoy reading this book that talks about the advantages of high output impedance amplifiers. https://www.current-drive.info/
The dual of an ordinary loudspeaker crossover filter should work well with an infinite output impedance amplifier.
Sorry > not interested 😎
PS.
Are you interested in amp/speaker combinations that sound like the speakers impedance curve?
Now the logical next step would be that someone asks: 'Do you really want your loudspeaker to distort unnecessarily?' and then the whole thread can derail into a discussion about current drive. That's quite unnecessary, though, as there are several threads about the advantages (lower distortion, no compression due to voice coil temperature changes) and disadvantage (need to find another way to damp resonances, or to equalize them out) of current drive.
"Audiophiles" are a funny bunch. They shun equipment with bass and treble controls while many lean in the direction of higher output impedance amplifiers to get that bass bump or enhanced highs due to the rise in impedance of one driver. So amplifier output impedance is just another knob that can be adjusted to produce a good effect when done wisely.
That's a great book that clearly explains the physics, electronics and acoustics of how loudspeakers work. It dispels the audiophile magazine promoted myths with simple physics. To understand how things actually work it is instructive to explore the limits, near zero output impedance, high output impedance and the range in between the two. It's not too difficult to create an amplifier with a knob on the front that adjusts the output impedance anywhere on the spectrum.
Along the lines of "modeling as a resistor" I start each passive crossover design by adding networks across the driver to flatten the impedance curve for each driver so that it looks like a resistor. Then when the passive crossover filters are added they do what you expect.
That's what I always used to do, and indeed, that is the way to do textbook design. However, it is not ALWAYS the best approach for great sound.
But, you would be correct to suggest it is probably the best place to start 🙂
