Thoughts on the Dayton PT2C-8

[sprint_9]

Just wondering what some of you guys that know way more then I do think on the Dayton PT2C-8. Ive been kind of throwing around ideas of a project with it and want to see what experts on the subject think. A couple ideas I have are to use it as a line in my L&R but still carry it over into the rest of the surround sound too so as to have a matched speaker set. Any thoughts are welcome as this is just preliminary thinking that I would atleast like to go over before I build something already proven on here. Thanks.

link http://www.partsexpress.com/pe/showd...number=275-085

[JonMarsh]

Go look at the distortion test results for the Yago ribbon at Zaph Audio- it's basically the same part. Not recommended, unfortunately. You'd be much better of with a Fountek Neo2CD, which naturally, costs more.

It's totally outperformed as a tweeter by the Peerless D26CN55, which is about $30.

[Gir]

From what I've been told, they're not very good on their own, but stack 8-12 of them on top of each other and you'll have a great line array. As for surround duty, not so much. Personally, I wouldn't worry about matching the speakers that much since those tweets just aren't that good on their own.

[sprint_9]

Thanks for the replies guys. Looks like I stick with something more proven like the RS28 or Seas H1212, unless ofcoarse I go with a line but I doubt it, wishfull thinking lol.

[Landroval]

Check this out: http://www.sunfire.com/CR.htm

Sunfire is using them with 1,5kHz XO with two sidefiring long-throw midwoofers. High SPL, but distortion is probably bad. Although Mr. Carver wouldn't release something that's total c**p?

[JonMarsh]

Well, you know, there's crap, then there's total crap. And in between, there's just somewhat worse crap. :W


Competitor "Y"



Competitor "P"


The magenta and gray are high order harmonics- 4th and 5th. Which do you want to listen to?


Energy storage- Cumulative Spectral Decay Plots (CSD)

Competitor "Y"



Competitor "P"



Thanks to John Krutke

[Gir]

Sprint9, don't let this deter you from building a line array if you have the budget. This is pretty much why they're only used in line arrays; every time you add a new driver, all the drivers together work less to produce the same SPL. If I understand correctly it's pretty much a linear relationship, so 8 of the PT2C's will be 1/8 of the distortion. I guess this depends if distortion is a linear function, but either way having a bunch of these drivers together can really rock. Just ask Thylantyr! I'm sure he'll be chiming in soon - he knows his line arrays.

[JonMarsh]

Unfortunately, drivers don't necessarily have a linear relationship of SPL level to distortion. Generally there's a range within about 25% of Xmax where the driver will be most linear, especially if the BL curve isn't very flat. But driver motors and suspension can have considerable non-linearities even around the "rest" point. I have seen this in my tests of subwoofers, some even claiming to have XBL^2 motors, which didn't fare well at 2.83 VRMS or 4 VRMS, much less 10 VRMS. If you want to go ribbon, there are better choices, but they do cost more. It's a long term investment if you build a speaker like that- making the right choices early in the process make in more likely you'll be satisfied.

I also believe from Sprint's comments that he was considering something more like the Sunfire speakers, not like Jim Griffin's original line array design.

[Mazeroth]

Jon,

How would you feel about a line of 10 crossed to a 3" full-range at around 3khz?

Also, I just spoke with Mike V at Parts Express about the new "C" version that's coming out and it's supposed to be better damped and have a flatter frequency response. Emphasis on supposed to.

[Dennis H]

Just ask Thylantyr! I'm sure he'll be chiming in soon - he knows his line arrays.

People have been asking Thy for some measurements for years. No joy so far. Apparently he doesn't believe in measuring speakers although he seems to believe that measuring an amp's max continuous power is very important.

[JonMarsh]

Jon,

How would you feel about a line of 10 crossed to a 3" full-range at around 3khz?

Also, I just spoke with Mike V at Parts Express about the new "C" version that's coming out and it's supposed to be better damped and have a flatter frequency response. Emphasis on supposed to.

I'd feel better about a line of 8 or 10 NeoCD2.0, but then I have a pile of Fountek boxes, so I guess I've voted with my money... :W



Don't get me wrong, it's a free country, and I understand the money thing involved here... Thomas and I tried the progenitor of the PE part, and didn't like it at all at 3 kHz and up.

[sprint_9]

I was thinking about a line for LR and then something like the sunfire for the rest. But for the money and after reading Jim's reviews on his Statements I may just go with them down the road, unless something else catches my eye or is better suited for my wallet like the Mini Statements or Reference WWMT.