opinions on vifa pl18 tl

[nebelk]

after quite a few different design ideas (firstly a ported bookshelf w/ help from madisound) i think i have finally arrived at a design i want to build.

i wanted to use a single sheet of 3/4" mdf so that limited the size and shape, but i think (hope) i arrived at pretty good compromise

also, how much tweeking must be done to use the crossovers originally designed for the ported box in the new set-up?

please let me know what you think.

drivers......
pl18wo-04
d27tg35

[nebelk]

i have tried to model this using mjk's worksheets, but i dont know how to save the graphs to post them,
and i am not quite convinced i modeled them correctly anyway.

so if anyone could model it or tell me how to post them it'd be appreciated.

and i am working on drawing up the crossover so hopefully someone can take a look and see if it is ok.

thanks

[vinylkid58]

You can copy/paste your plots in Mathcad into another program, even MS Paint will work. Then you can save the graphs as .JPEG etc.

Jeff

[Curmudgeon]

I would expect the original xo frequency to be high enough that the cabinet design would not affect it. Most of the effect of the cabinet design would be in the low bass, although there might be a secondary effect depending on whether the original xo was designed with a baffle step, and if you've changed the cabinet width or tweeter position on the faceplate.

[nebelk]

the origional crossover is below, i think bsc was taken into consideration, but i dont know for sure. if it was designed in, is it appropriate for an 8" baffle?

also, could someone tell me the approx crossover point and slopes.

i am working on the mjk sims so hopefully i can get them up shortly.

thanks

[nebelk]

here is the mjk simulation done using the old(free) offset version

[elfranche]

I've used the D27 for some years. very nice..

[nebelk]

ok, can someone tell me if the first crossover i posted looks correct, or if the one below looks better............

[Willitwork]

Originally posted by elfranche
I've used the D27 for some years. very nice..

I used to like it as well until I started running into so many bad ones that I don't dare buy D27's anymore, and this applies to all of them (15's, 35's and 45's). The risk of having problems is simply too high. By "problems" I mean units that measure way outside their published specs and don't even come close to matching with one another. It's not a question of tolerances, they're just plain bad. I know Vifa supposedly fixed problems with the D27 but I've had problems with the "fixed" ones as well so I have my doubts. I'm very close to thinking that the D27 line was poorly designed, plain and simple. This being said I have no complaints about other Vifa tweeter models, I especially appreciate the D25 and D26 but unfortunately these are hard to come by these days. But on the bright side of things, is there are better quality tweeters that sell for less (at least in North America) available to DIY'ers now, such as Hi-Vi units.

As for the PL18, in my personal experience it's an excellent driver. Pricey for a Vifa but it's in a different league than other Vifas and considering its quality it's a good value. Chinese made drivers of similar quality don't sell for much less, when they aren't more expensive. This is just my personal opinion, based on my own listening. The PL line is quite new and I haven't seen any thorough reviews of those drivers yet. I sure would like to.

[nebelk]

please disregard the second crossover i posted,

I beleive the first one is correct and is a second order 12db slope with an L-pad on the tweeter and a Zobel circuit on the woofer.

Is this correct?

any help would be greatly appreciated