3-way reference project??

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#443
Hi Speedie, no I completely missed it 😉 I only saw the kits bit, and didn't read the rest as I thought it was your sig... must be tired...

I just went and looked but can't find the thread you are referring to, maybe too many glasses of red, care to post a link? 🙂

Tony.

PS. and yes akabak is a bit like starwars (SDI??) I found the reason for the lump in the response around 500Hz, yet again something rabbitz has posted about, moving the woofer up the baffle a bit (not so close to the floor) smooths it out substantially, but I guess that is a good thing, it shows that the program actually works!!
 
#447
speedie said:
would these concepts be of any help in design? go to suggestions for mtm mains in this forum
they are still at the cutting stage of the project
cheers speedie
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I did not see any links. My current speakers (since the mid 90s) are MTM (8546-9900) with a sub (2 x DV12 per channel) before that (mid 80s) I used MTMs using Focal 8N515 and MDT33 (the subs were JBL 2245 in B460 bins - one per channel).

wintermute said:
BSC (from MJK's excell spreadsheet sans the zobel, as it dropped the mid too much) 1.8mH in parallel with 4.6ohm resistor. This is in front of ALL other filter elements...
low pass: 6.93mH in series, 41.65uf to ground.
Mid: --- 0.35mh in series 7uF to ground --- 27uF in series 6.53mH to ground.
Tweeter: 5.71uF in series 0.95 mH to ground

4db BSC is probably going to be too much though IMO if close to a wall...
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rabbitz said:
One advantage of 3-ways is your can get BSC easier than the others if you set the woofer crossover point in the right place and work on the levels of the mid and tweeter.
Generally I've found the actual baffle step correction frequency is a lot lower than the calculated one (115/Baffle Width). For example I had baffle step F3=360Hz but the 0.5 woofer was crossed over around 150Hz to give the required BSC. Full BSC with the 0.5 woofer can be too much due to other factors such as the room and speaker positioning.
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I tend to agree with Rabbitz. With the woofer crossing over at 300Hz or so the upper midrange output of the woofer can be used to compensate for BSC in the midrange (where most of the BSC effects are felt anyway). Unfortunately since the level and slope of upper mid output of the woofer will be managed by a LC network (Low Pass) we cant 'dial it in'. For those of us going active 'dialing in' might be possible though.

LR networks ae required when the BSC is in the range of the woofer (such as in a fullrange or traditional 2 way system whre the woofer manages all output till about 2khz).

speedie said:
did you guys take a look at what was posted?
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Were there any links ..because I did not see any? I suppose you are refering to this thread.
http://www.diyaudio.com/forums/multi-way/151530-suggestions-mtm-mains.html
 
#451
kits

when i finally get these long antisipated panels back i will post build progression
it has been a long prosess so far what with buying bassbox reading getting my mate to draw these in autocad so the macchine dude can cut them out and now its xmas!
hope to be listening to them in the new year
all of the drivers are still sitting in my spare room just waiting to make some noise
 
#453
Moon doggie
It has been some time in this build but to keep you updated i have finally got back the panels from cnc dude
And guess what there are still issues with fit and speaker relief sizes
So back they go again for more tweaking
I do hope that all of this extra moving around doesn’t mark scratch or chip any of the baffles
Here is another thought the drivers that I bought through WES are now out of warranty and have never fired a sound wave
Some thing of topic the company Emotiva where having a sale on so I couldn’t help myself and bought 1 XPA 2/ 1 XPA 5/ both kick **** amps 1 of there reference CD players and there flagship processor
Now more than ever the need to finish this project is more apparent
All the best for this coming year
Cheers speedie
 
#456
I think it is called the Global Financial Crisis.
We couldn't seem to agree on what the term :"Reference" actually meant; I meant it to be a 3-way in the same vein as Rabbitz little 2-way using the Vifa P-13/D-27
Also the world wide availability of reasonably priced and easy to work with drivers seemed to be a problem
 
#460
Well Rabbitz isn't really active anymore and as I no longer have an income I'm stymied
Also I've had a rethink after visiting Troels website again and I think that the best solution would be unpopular in todays world of subwoofers and mini speakers, but a decent 12 inch woofer and any high quality 4 or 5 inch low crossing mid-range coupled with a really good tweeter as per Troels studio monitor projects
 
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