Thanks @Marveloudio ! 😎
The article doesn't mention if the chamber is closed or open (as a TL can be closed or open), but the picture below lets me think that it is possibly a closed chamber, that can be used directly in the main volume of the enclosure :
Plus it stays at an affordable price here in France at 170-180 Euros.
T
Not sure it has been mentioned yet but I think Dynaudio did an OEM 3” dome that was used in Volvo car systems in the early 2000, often available at reasonable prices on a well known auction site. Quick google threw up a number for the Volvo C70 with a part number 3533792.
Dynaudio also has car audio 3" midrange dome MD142. (same as volvo unit?)
You can actually buy this still from some shops. This is also tested by hificompass and it looks quite nice. Very good frequency response, no resonances. THD is ok.
You can actually buy this still from some shops. This is also tested by hificompass and it looks quite nice. Very good frequency response, no resonances. THD is ok.
Yes. Here's the response of the Dynaudio MD142 :
The sensivity is not mentioned, but looking to thr FR curve, I'd note an average at 88dB/w/m.
T
Woah......that MD42 has a REALLY nice curve for a simply xo........1st order electrics just might give you the 2nd order acoustics needed since there's no breakup anywhere to speak of.....NICE!
Of baffle widths, and mid-dome positions along with tweeters, seems most commercial speakers use center spacing, nothing fancy. Only ATC do a mild offset to the inner edge. Are there other considerations or is it not a big deal?
I have modded the D76AF a few times , very similar built with a few exceptions , no ferrofluid . The MD142 is for car audio and somewhat lower suited for Hifi . Those Volvo derivates at Ebay look like crap and all are damaged in the photos ....
ESOTEC Line , I love the 200mm unit :
https://14515867.fs1.hubspotusercon.../Downloads/dyn_automotive_brochure_int_dp.pdf
https://14515867.fs1.hubspotusercon.../Downloads/dyn_automotive_brochure_int_dp.pdf
BTW, the "AF" in the Dynaudio dome model numbers stand for "Aluminium Faceplate", not indicating the use of ferrofluid.
None of the older Dynaudio mid domes I've come across use ferrofluid.
None of the older Dynaudio mid domes I've come across use ferrofluid.
Some of my Dynaudios in germany were different : D52AF and D5406 both had FF !! (tweeters also)
An update on the Hivi DMB-A dome mids - I've measured TSPs on the four pieces I have here. They are very close in Fs, but thats where the good news ends.
These things all over the place with all the other specs. The overall Qts is over 1.5 on all four, which is too high for use without an LCR crossinh anywhere lower than 800 - 900 hz 3rd order. Qms ranges from 2.7 to 4.8 with no close grouping in between units. DCR also varies by +/- 10 percent, which is a pretty good indicator of overall consistency - not good, but expected at this $30 price point.
You could get Qts down under 1.0 with extra dampening in the pole vent, but then you'll sacrifice output down low around cutoff. The 90+ dB sensitivity will turn into 88 dB. Add to that the extra parts for an LCR (at least $15 worth including the larger size coil), its not looking that much of a good value when comparing other decent quality budget cone mids in the $50 - $75 range.
These things all over the place with all the other specs. The overall Qts is over 1.5 on all four, which is too high for use without an LCR crossinh anywhere lower than 800 - 900 hz 3rd order. Qms ranges from 2.7 to 4.8 with no close grouping in between units. DCR also varies by +/- 10 percent, which is a pretty good indicator of overall consistency - not good, but expected at this $30 price point.
You could get Qts down under 1.0 with extra dampening in the pole vent, but then you'll sacrifice output down low around cutoff. The 90+ dB sensitivity will turn into 88 dB. Add to that the extra parts for an LCR (at least $15 worth including the larger size coil), its not looking that much of a good value when comparing other decent quality budget cone mids in the $50 - $75 range.
Going back to post #84...I have two Dayton RS52F's on hand. Do I sell them and get the $30 HiVis? I haven't actually seen the RS52F's used much, and definitely haven't heard them myself, so I kind of want to see if I can make them work.
I'd try to use the RS52s if they have the lower mid extension you need. The DMB-As will need an LCR regardless of HP you chose.
I recently modeled baffle diffraction for a mid I had intended to place centrally along the horizontal axis. This position gave the worst response. The smoothest response was with the mid close to the edge. I have seen speakers using the ATC mid that had a similar placement. However, I find the look to be not aesthetically pleasing, as the mid and tweet frames overlap the frame of the woofer. I would prefer these drivers to be within the width of the woofer frame. The positions I finally chose for the mid and tweeter are a compromise between the optimal placement acoustically and visual appeal. I suppose this is a good example of the engineering compromises one does during design. Nevertheless, it is still a significant improvement on the central placement.
Modeling was done using VituixCAD.
I use these, they have excellent transients with the aluminum dome but also can get a bite bright depending on the music and SPL you like.