For a text book XO. People often use the falling response of a driver as part of the XO.
dave
Even from the plot you posted it appears that the TC9FD is flatter over 800Hz and 5.5kHz. Also, when using this as a mid, the responses below and above the XO points should be smooth for an octave below and above the XO point.
Hi X, I was basing (the comment) on this graph, not your original measurements. though if overlayed it may be different. I haven't downloaded those measurements.
Tony.
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People enjoy all sorts of things.
Doesn't really matter if this driver is used full range. A car without a motor is useless even if the suspension is good.
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I thought you would know what those specific 'Japanese needs' are. I doubt there are differences in how humans from different cultures hear. Olive did a study on that topic Audio Musings by Sean Olive: The Influence of Listeners' Experience, Age and Culture on Headphone Sound Quality Preferences
'On average, listeners preferred the reference headphone that was based on the in-room frequency response of an accurate loudspeaker calibrated in a reference listening room. This was generally true regardless of the listener’s experience, age, gender and culture.'
Thank you for your kind reply! Many interesting designs ill see! So interesting that it would be pity to leave 6ND430 un-used? 6ND430 could deliver some slam & power for rock that Vifa couldnt do(?) That is why i thinked if they could be combined. I have them already paid..
Thisfar my plan for both would be, total box of 8 liters: 5 liters vented (tuned 90hz) for 6nd430 and 3 liters sealed for Vifa, like you suggested.
I have minidsp 2x4.
Are some of your exotic designs usable to combine with 6ND430?
Those 6ND430 drivers are very nice. How many do you have? I think for sufficient bass, at least two per side wired in parallel for 4 ohms should get you about 93dB at 2,83v (they look like 87dB at 90Hz). That should be a good match for the Vifa to give good coverage to avoid baffle step losses. You can XO a bit higher - maybe 600Hz even... That will let the TC9FD be pretty free of large excursions and go louder to keep up with the 93dB bass.
Oceanw,
If you have the time investigate these TC9FD related stuff.
Try listening the first sound clip in #75 here http://www.diyaudio.com/forums/full-range/268037-fast-tl-8.html#post4192688, that is one of the best sounding sound clips i have listened with TC9 involved, but try yourself i could be wrong. More info for Hypercube boxes here http://www.diyaudio.com/forums/full-range/265053-hypercube-loudspeakers.html. xrk971 HyperFAST here http://www.diyaudio.com/forums/full-range/265915-hyperfast-hypercube-based-2-way.html.
If you have the time investigate these TC9FD related stuff.
Try listening the first sound clip in #75 here http://www.diyaudio.com/forums/full-range/268037-fast-tl-8.html#post4192688, that is one of the best sounding sound clips i have listened with TC9 involved, but try yourself i could be wrong. More info for Hypercube boxes here http://www.diyaudio.com/forums/full-range/265053-hypercube-loudspeakers.html. xrk971 HyperFAST here http://www.diyaudio.com/forums/full-range/265915-hyperfast-hypercube-based-2-way.html.
I have one pair available. They are 4 ohm versions. Maybe one per speaker is enough if i use them with good reinforcements at lows?
Planning to test/use these with my undergoing stereo-"multiple small reinforcement woofers" system. (Im not sure if i can call this subwoofer yet, its not ready, and at the limits of min box size, 50liters). Sorry if going of topic.
https://www.diyaudio.com/forums/<a href=http://postimg.org/image/rgitcm05r/ target=_blank>[IMGDEAD]http://s3.postimg.org/rgitcm05r/WP_20150216_18_30_43_Pro.jpg[/IMGDEAD][URL="http://postimage.org/"][IMGDEAD]http://s3.postimg.org/s61loz0pf/WP_20150216_18_30_43_Pro.jpg[/IMGDEAD][/URL]
[URL="http://postimage.org/"]picture uploading[/URL]
Especially last link of "hyperfast hypercube" made me think if 6nd430 and TC9FD could be used like that and attached to top of my woofer encosures & aimed littlebit downwards (enclosures are about 1,6m tall). However how to do right sized hypercube to 6nd430 need more studying and reading those posts.
Thanks for great suggestions & links!
Agree 6nd430 and TC9FD each having their own Hypercube then at top the sub will look good and probably perform very well because of the acoustic paths inside the advanced to create box will pay back. The math a problem for me too but probably some would help if asked, if remember right there some understandable math and examples over Hypercube thread if reading thru. Look forward if you share project no matter which design solution, you certainly have nice drivers.
The Hypercube volume is given by 11/6a^3 where a is the edge dimension of the one square face where driver mounts. For 6.5in driver probably need at least 7in edge which gives 10.3 liter volume. There is a broad resonance bump in the Hypercube that is easily EQ'd out with miniDSP but otherwise the enclosure sounds very open with no parallel walls. IIRC, the Hypercube for the TC9FD ended up at 3 to 3.5 liters depending on how close you make the square. A perfect volume actually.
The quick panel drawings I did are here (I can update those if it would help):Hypercube Loudspeakers #150
And the volume calculations I did are here: Hypercube Loudspeakers #262
And the web page Tesserax made to calculate volume is here: Calculate.html
Let me know if you need any more help with the box design.
OK, now this more doable. Thanks! When have time i think ill train with cardboard just to get idea how to assemble cube correctly and after that get some foam board from local advertising company. They call it "Kapa board" in here.
Has anyone tried to hot rod their TC9FD?
Coatings on cone, remove dustcap, add phase plug, putty on basket, felt on magnet back, etc...?
Certainly cheap enough to try new things. I have a dented dustcap (young little curious fingers are the demise of a many drivers
). I could de-dustcap and add plastic or clay phase plug.
Did you know that the new Play Dough formulation hardens to a nice smooth plastic like object? Very useful for phase plug demos.
Coatings on cone, remove dustcap, add phase plug, putty on basket, felt on magnet back, etc...?
Certainly cheap enough to try new things. I have a dented dustcap (young little curious fingers are the demise of a many drivers
). I could de-dustcap and add plastic or clay phase plug. Did you know that the new Play Dough formulation hardens to a nice smooth plastic like object? Very useful for phase plug demos.
xrk971,
Think good idea, and if fails one is not ruined.
I had though planned in a upcoming test to put a small PCB clone on the fortification placed opposite cable spades to see if this acoustic load balance brings something better to the IR/FR data, and last thought was try to cut off that fortification and measure again.
Think good idea, and if fails one is not ruined.
I had though planned in a upcoming test to put a small PCB clone on the fortification placed opposite cable spades to see if this acoustic load balance brings something better to the IR/FR data, and last thought was try to cut off that fortification and measure again.
I was just thinking it's been a while since there's been a tweaking thread.
Since the TC9FD drivers are already coated, there's probably not a lot to be gained in this instance from coating. The other stuff, it all adds up and it's worth a try. I've not experimented with these particular drivers, but have done those tweaks on plenty of similar drivers.
One tweak that can improve the detail retrieval of highly damped cone drivers like the Vifa is leafing. Get some aluminum faux 'silver' leaf at an art supply store, and do both sides. It's a little labor intensive but effective. Dragan from the old Melhuish forum was the big proponent of this, but I think his how-to pages are no longer up.
Fostex drivers OTOH I don't even take seriously until they've had a coat or two of thinned dammar and/or garnet shellac, depending on the goals. Some folks like puzzlecoat.
Since the TC9FD drivers are already coated, there's probably not a lot to be gained in this instance from coating. The other stuff, it all adds up and it's worth a try. I've not experimented with these particular drivers, but have done those tweaks on plenty of similar drivers.
One tweak that can improve the detail retrieval of highly damped cone drivers like the Vifa is leafing. Get some aluminum faux 'silver' leaf at an art supply store, and do both sides. It's a little labor intensive but effective. Dragan from the old Melhuish forum was the big proponent of this, but I think his how-to pages are no longer up.
Fostex drivers OTOH I don't even take seriously until they've had a coat or two of thinned dammar and/or garnet shellac, depending on the goals. Some folks like puzzlecoat.
I know koldby used Isopunkt on his vifa's used in the line arrays.
http://www.diyaudio.com/forums/full-range/203356-cloning-ids-25s-4.html#post3232317
Can't seem to trace that product anymore though. The first mention of Isopunkt for cone drivers I read on one of the papers from Mr. Steen Aa. Duelund:
http://duelundaudio.com/articles-by-mr-steen-aa-duelund/
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