A very annoying effect with full range drivers and also with several mid range drivers do not only represent the typical peaks and dips (which is a usual feature) but sometimes a pronounced peak immediately followed by a pronounced dip.
This is a big issue in my view as long it is only caused by internal effects and interactions between the cone, surround and spider (and not by effects through the wrong ratio of sizes of box resp. cabinet - which is avoided if ratio is chosen correctly).
The plots under
https://www.diyaudio.com/community/threads/what-causes-this-peak-dip-in-frequency-response.264502/show exact, what I mean.
Sometimes more pronounced, but also sometimes less pronounced is this unwanted effect in the plots for frequency responses to observe with this drivers:
https://www.fostexinternational.com/docs/speaker_components/pdf/FE108NS.pdf
https://www.fostexinternational.com/docs/speaker_components/pdf/FE103NV.pdf
https://en.toutlehautparleur.com/media/catalog/product/datasheet/phl/930ND-8.pdf
https://www.fane-international.com/downloads/FANE-STUDIO-5FRK-DS141117.pdf
https://www.eminence.com/pdf/Alpha_4_4.pdf
https://www.eminence.com/pdf/Alpha_3_32.pdf
https://www.precision-devices.com/products/all-products/pd-615c002/https://www.fane-acoustics.com/view-product/Ascension-A90
https://www.precision-devices.com/products/all-products/pd-615n002/
Not obviously present (at least not in this increased form) is this unwanted effect in the plots of the frequency response from this drivers:
http://www.eifl.co.jp/index/export/diatone/p610.htmhttps://aer-loudspeakers.com/wp-content/uploads/2018/12/AER-Breitbandtreiber-BD-3-BD-3B.pdfhttps://www.beyma.com/en/products/c/low-mid-frequency/106MI108/altavoz-6mi100-8-oh/https://www.falconacoustics.co.uk/a...sm-pr-17hr37-pr17hr60-pr17hr70-pr17hr100.htmlhttp://www.bmsspeakers.com/fileadmi...160_2011-04_neodymium_low_midrange_driver.pdfhttps://www.fostexinternational.com/docs/speaker_components/pdf/f120a.pdfhttps://monacor-webshop.de/ms-130.html
Follow questions rises up:
1) What is the cause of this peak closely followed by a dip (thin, light cones resp. diaphragms cannot be the real cause, as can be seen e. g. with the Diatone P610)
2) Is it possible to remove this anomaly in the frequency response by efforts e. g. like to see in follow threads ?
https://www.diyaudio.com/community/threads/painting-full range-driver-cone.329024/page-2
https://www.diyaudio.com/community/...ng-substances-for-speakers-cones.81814/page-3
3) If only there was the peak, an easy to realize passive equalizer network (serial LCR in parallel) was easy to add
for remove it.
But how I remove the additional dip without changing the cone conditions - also without an additional parametric equalizer ?
Thanks for any advice.
P.S.: These plots show such an extremely pronounced fissure in the frequency plot that a correction would be extremely time-consuming T
http://www.troelsgravesen.dk/Lowther.htm
This is a big issue in my view as long it is only caused by internal effects and interactions between the cone, surround and spider (and not by effects through the wrong ratio of sizes of box resp. cabinet - which is avoided if ratio is chosen correctly).
The plots under
https://www.diyaudio.com/community/threads/what-causes-this-peak-dip-in-frequency-response.264502/show exact, what I mean.
Sometimes more pronounced, but also sometimes less pronounced is this unwanted effect in the plots for frequency responses to observe with this drivers:
https://www.fostexinternational.com/docs/speaker_components/pdf/FE108NS.pdf
https://www.fostexinternational.com/docs/speaker_components/pdf/FE103NV.pdf
https://en.toutlehautparleur.com/media/catalog/product/datasheet/phl/930ND-8.pdf
https://www.fane-international.com/downloads/FANE-STUDIO-5FRK-DS141117.pdf
https://www.eminence.com/pdf/Alpha_4_4.pdf
https://www.eminence.com/pdf/Alpha_3_32.pdf
https://www.precision-devices.com/products/all-products/pd-615c002/https://www.fane-acoustics.com/view-product/Ascension-A90
https://www.precision-devices.com/products/all-products/pd-615n002/
Not obviously present (at least not in this increased form) is this unwanted effect in the plots of the frequency response from this drivers:
http://www.eifl.co.jp/index/export/diatone/p610.htmhttps://aer-loudspeakers.com/wp-content/uploads/2018/12/AER-Breitbandtreiber-BD-3-BD-3B.pdfhttps://www.beyma.com/en/products/c/low-mid-frequency/106MI108/altavoz-6mi100-8-oh/https://www.falconacoustics.co.uk/a...sm-pr-17hr37-pr17hr60-pr17hr70-pr17hr100.htmlhttp://www.bmsspeakers.com/fileadmi...160_2011-04_neodymium_low_midrange_driver.pdfhttps://www.fostexinternational.com/docs/speaker_components/pdf/f120a.pdfhttps://monacor-webshop.de/ms-130.html
Follow questions rises up:
1) What is the cause of this peak closely followed by a dip (thin, light cones resp. diaphragms cannot be the real cause, as can be seen e. g. with the Diatone P610)
2) Is it possible to remove this anomaly in the frequency response by efforts e. g. like to see in follow threads ?
https://www.diyaudio.com/community/threads/painting-full range-driver-cone.329024/page-2
https://www.diyaudio.com/community/...ng-substances-for-speakers-cones.81814/page-3
3) If only there was the peak, an easy to realize passive equalizer network (serial LCR in parallel) was easy to add
for remove it.
But how I remove the additional dip without changing the cone conditions - also without an additional parametric equalizer ?
Thanks for any advice.
P.S.: These plots show such an extremely pronounced fissure in the frequency plot that a correction would be extremely time-consuming T
http://www.troelsgravesen.dk/Lowther.htm
Well, the 5MR450-NDY-4's is likely an eigenmode across the diaphragm based on [95*4/pi]^0.5 = ~11 cm dia. = ~34400/2/11 = ~1564 Hz, a common problem with deep diaphragms and/or inverted surrounds, tall gaskets.
Sorry, don't have time to look at the others. 🙁
Sorry, don't have time to look at the others. 🙁
As GM said, cone and surround design will affect FR.
As you mentioned, peaks are more easily removed by notches, either done passively or actively.
Dips, if sharp enough will not be so noticeable.
Bigger dips will be very hard to take care of. Applying active EQ trying to correct a dip will only aggravate the performance, and introduce distortion exponentially, asking a driver to do something it can't.
The only way to solve a severe dip is to lower everything else to the level of the dip. Not something most are looking for.
So, in the end, dips are something you will have live with, or just choose a different driver... easy enough!
In the end, you have to choose between going with all the hype and living with a ragged FR (they will call it character!), or choosing a driver suited to your needs and taste.
As you mentioned, peaks are more easily removed by notches, either done passively or actively.
Dips, if sharp enough will not be so noticeable.
Bigger dips will be very hard to take care of. Applying active EQ trying to correct a dip will only aggravate the performance, and introduce distortion exponentially, asking a driver to do something it can't.
The only way to solve a severe dip is to lower everything else to the level of the dip. Not something most are looking for.
So, in the end, dips are something you will have live with, or just choose a different driver... easy enough!
In the end, you have to choose between going with all the hype and living with a ragged FR (they will call it character!), or choosing a driver suited to your needs and taste.
If such unwanted effects occurs by the kind of cabinet like described under
https://www.diyaudio.com/community/threads/diffraction.196668/and
http://usenclosure.com/Diffraction Graphs/diffraction-graphs.htmor by effects of speaker-boundary interference - go to
http://arqen.com/acoustics-101/speaker-placement-boundary-interference/one can such effects avoid by performing the appropriate steps
Even in cases, where the cones causes such effects some manufacturers take action under great efforts to remove this with use of special rubber versions of surround suspension and cone material - go to the URLs in follow:
https://audioxpress.com/article/new-high-performance-cone-and-diaphragm-technologyhttps://audioxpress.com/article/Plastic-Speaker-Cone-Historyhttps://www.soundimports.eu/de/puri...MIo7ygvJjh9AIVi6Z3Ch2RZgNKEAQYAyABEgL8-vD_BwEhttps://www.hifisound.de/de/Lautspr...oener/Scan-Speak-15-M-4531-K00-Revelator.html
For me most important question is, what can I make at the cones resp diaphragms afterwards to remove unwanted dips resp. notches in the frequency responses except equalizer using). Good known is this kind of modification:
https://www.simplyspeakers.com/speaker-repair-cone-edge-sealer-mi-1291fg.html (coating)
https://www.head-fi.org/threads/spe...mic-and-balanced-armature-type-try-it.490277/How I find the best URL's in this case ?
https://www.diyaudio.com/community/threads/diffraction.196668/and
http://usenclosure.com/Diffraction Graphs/diffraction-graphs.htmor by effects of speaker-boundary interference - go to
http://arqen.com/acoustics-101/speaker-placement-boundary-interference/one can such effects avoid by performing the appropriate steps
Even in cases, where the cones causes such effects some manufacturers take action under great efforts to remove this with use of special rubber versions of surround suspension and cone material - go to the URLs in follow:
https://audioxpress.com/article/new-high-performance-cone-and-diaphragm-technologyhttps://audioxpress.com/article/Plastic-Speaker-Cone-Historyhttps://www.soundimports.eu/de/puri...MIo7ygvJjh9AIVi6Z3Ch2RZgNKEAQYAyABEgL8-vD_BwEhttps://www.hifisound.de/de/Lautspr...oener/Scan-Speak-15-M-4531-K00-Revelator.html
For me most important question is, what can I make at the cones resp diaphragms afterwards to remove unwanted dips resp. notches in the frequency responses except equalizer using). Good known is this kind of modification:
https://www.simplyspeakers.com/speaker-repair-cone-edge-sealer-mi-1291fg.html (coating)
https://www.head-fi.org/threads/spe...mic-and-balanced-armature-type-try-it.490277/How I find the best URL's in this case ?