Eldam,
Let me have a disclaimer upfront so you know who you are exchanging with. I'm new to building speakers, very new. I'm an engineer, though, been reading a lot about the subject and have a long history of DIY at multiple stuff, and a good history with hi-fi. So I have a grasp on a number of things, but I'm no speaker expert. Internet fora facilitate anyone portray him/herself as experts...many aren't.
Having said that:
Hi Lewinski,
Do you know if the Winsd simulations is with baflestep compensation or not ?
I don't know for fact as I don't usually use that software, but I believe it doesn't. Look for Jeff Bagby's Diffraction Simulator for baffle step response.
What can be the usefull F3 frequencies in the low end without EQ in a sealed enclosure according to you ? I don't find what Angelo found with Edge soft...
Angelo is indeed experienced. Yet I believe his design is following a belief that less crossovers are better. Some experts agree, some don't. In my calculations the 12P80Nd has an F3 of 258Hz in a sealed box with Qtc=0.707. Too high an F3, in my view, for a woofer. Then the 12P80Nd performs great as a midrange, but has the directivity issues all large drivers display as frequency goes up. So I decided not to use it in my design.
A question worth asking is how important to sound is dispersion smoothness? Honestly, I don't know. Again, some experts say it's critical, others say it's overrated. I'm trying to keep it smooth.
What is your plan to avoid a resistor to lower the efficienty of the TPL150 ?
I won't have one. Don't need it. Mine will be an active 4-way, so sensitivity mismatches are not as critical as with passive xo.
the horizontal expansion of the horn in the H model seems shy for an home environment (80° is a little short ?) ?
Again, experts disagree on this one. Directivity seems to be critical to some, and I'm choosing to follow that credo. 80degree is not bad in a small room: if you place them near a corner and towards the inside then dispersion stays within the 90degrees of the walls, minimizing reflections on side walls. Not bad. It is also easier to match dispersion with larger drivers, like 6.5" at 2200Hz. Without the waveguide you would need a small midrange to match dispersion.
I try to find a 3 ways solution only..., but the 18sounds drivers in 8 or 12... I don't find any solution on the paper ! Although I don't sketch as Linsource does !
Any good link for sketching a driver in an enclosure ? (free soft I mean)
I'm afraid I'm not of much help there. I find almost all 3-ways a compromise of some sort. If I were to do a 3-way, though, Angelo's would be in my short list, the compromise being on dispersion mismatch and using the TPL down lower than where it seems to work most comfortably.
Not sure what you mean by sketching software. Drawing? Autocad. I use Excel for most of my things.
The more I think to the TPL with my poor understanding and without a diy horn, the more I believe than 2000 hZ is a risky bet, Under it is worse ! And I ask myself if there is any interrest to use it upon 5K hZ with a 5" Full range (two in fact to cop the sensivity) between it and a 12" at 800 Hz to around 1000 hz (12P80 ndv2 or FEv2) ?
I've come to the conclusion I should cross over the TPL-150H ideally at 2500Hz, and maybe down to 2000Hz. Angelo goes down to 1600 and he's happy, though. Many others do the same.
The more I look into this, the more I realize a 6.5" midrange has ideal dispersion for the match at 2500Hz. Smaller midranges have smaller impact, so I'm also considering 8". See my question above regarding TD10M in an attempt to find a good 10", but it's not looking promising right now.
Below that I plan to use two Beyma 10G40 per side, working from 80 to 350/400Hz. These are woofers, not midranges, and will be used as midbass woofers in sealed boxes. I go for two because calculations suggest two drivers allow to better compensate for baffle step.
Finally a subwoofer per side, in a sealed box, to do up to 80Hz.
Sorry for the long answer. I hope it helps,