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Delta 15LFA ??? [message #61682] Thu, 07 January 2010 14:21 Go to next message
Wayne-o is currently offline  Wayne-o
Messages: 225
Registered: May 2009
Master
Would the Delta15lfa work with the 3-pi in a larger box ? If not at what freq. range is the d15lfa not right or different from the Delta 12lfa ? Thanks.
Re: Delta 15LFA ??? [message #61683 is a reply to message #61682] Thu, 07 January 2010 15:39 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18789
Registered: January 2001
Illuminati (33rd Degree)

I never really worked much with that woofer. As I recall, you could drop it in what used to be a Theater four π cabinet, bascially 8ft3 tuned to 30Hz. But it could stand a larger box too.

Re: Delta 15LFA ??? [message #61689 is a reply to message #61682] Fri, 08 January 2010 10:11 Go to previous messageGo to next message
Wayne-o is currently offline  Wayne-o
Messages: 225
Registered: May 2009
Master
What horn did you use on the earlier Theater-4's ??? Thanks !!!
Re: Delta 15LFA ??? [message #61690 is a reply to message #61689] Fri, 08 January 2010 11:39 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18789
Registered: January 2001
Illuminati (33rd Degree)

I've used both the H290 and the Peavey CH-3.

Both are good horns, both provide a good pattern and smooth response. However, the Peavey horn has a peculiar seam and throat shape that I initially thought would be a problem - it proved not to be, and instead, the CH-3 was an extremely good horn both by measurements and by ear. The H290 is a good horn too, but its smaller size requires it to be limited to use above 1.2kHz or so - not a problem since all my designs cross it at this point or higher. It is a one piece design with nice flare profile and smooth transition from throat to mouth.

The H290 has always been used in my speakers smaller than 3ft3 but I thought larger speakers looked better with the CH-3, so that's what I used to put in the big boxes like the Theater fours. It's a mute point now, since these cabinets have been discontinued for years, and all current models use the H290 or my own wood horn.

After living with both the CH-3 and H290 horns, I think the H290 is a smidge smoother but that may be just because I think it should be by looking at it. It's definitely not night and day, maybe not even different shades of grey. Could be six one way and half dozen the other, they're that close in sound. But I do tend to prefer the H290, for whatever that's worth.

Re: Delta 15LFA ??? [message #61699 is a reply to message #61682] Fri, 08 January 2010 19:09 Go to previous messageGo to next message
Wayne-o is currently offline  Wayne-o
Messages: 225
Registered: May 2009
Master
It seems that a lot of people are very happy with their Theater- four speakers and like the tone of them. When I first visited your site the theater -fours were listed. There was so many speakers that I didnt know which one to try to make. Going back thru the forums the Theater-Fours stood out. I know the size is large, but is it that they have a better low end then the three-Pis ???
Re: Delta 15LFA ??? [message #61700 is a reply to message #61699] Fri, 08 January 2010 19:41 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18789
Registered: January 2001
Illuminati (33rd Degree)

They were a very good sounding speaker, that's for sure. Bass went deep with gradual smooth rolloff, much like most of my speakers. I think the biggest reason they were so popular is the kits were very inexpensive. You got a lot of speaker for the money if you built them yourself.

Re: Delta 15LFA ??? [message #61701 is a reply to message #61682] Fri, 08 January 2010 20:09 Go to previous message
Wayne-o is currently offline  Wayne-o
Messages: 225
Registered: May 2009
Master
Ok, That is what I Thought! The money makes a difference, Plus some may think of it as a classic. Thanks for the reply.
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