speakerplans 1850 horn?

[osse]

Anybody heard it? Specs are good for the size(29,5x25x37,5 inch).. I think its a bit on the heavy side due to 18 cm thick ply

[Dan30]

24" T48. (The 1850 chart is estimated, not measured.)

[osse]

Won't the pd1850 be able to take higher voltage due to 1296 vd? This I quite don't understand, are the sensitivity charts+vd telling the whole story about a design or are the sensitivity alone enought to compare designs?

Offcourse you should listen to them to get the real picture

[Dan30]

Won't the pd1850 be able to take higher voltage due to 1296 vd? This I quite don't understand, are the sensitivity charts+vd telling the whole story about a design or are the sensitivity alone enought to compare designs?

Offcourse you should listen to them to get the real picture

I'm no expert by any means so someone correct me if i'm wrong. Up to 60v (the limit of the 3015LF) the T48 will be more efficient except from roughly 43-62hz. The 1850 with a higher vd will have a higher maximum output with more power pumped into it.

[Bill Fitzmaurice]

Won't the pd1850 be able to take higher voltage due to 1296 vd?

Not necessarily. Driver excursion for a given SPL is reduced by horn length. And excursion rises precipitously below the horn corner frequency, so if you need to go below 50Hz the 1850 is the wrong tool for the job. For that matter it's not all that great above 50Hz either, where T39s of equal size and much lower cost would work better.