What To Do With 416-8Z Woofers

**dc270** · August 30th, 2009, 06:47 PM

Anybody have box plans drawn up for these woofers. I know they came from Valencias, would be curious to know how high you can cross them over at. I got them for $200 hope I was not skunked!

I do have plans for an updated Model 19 design. Once I know the high end then I can better plan on what to do with them. I do not have any 511 horns to match them- hope I can use them higher than 500 hz if not them I'll just have to get creative......

Thanks for your thought here.
DC

**Old Guy** · August 30th, 2009, 07:10 PM

800 is fine...I have seen 1200 but I would prefer 800 personally..your mileage may vary...

GM · August 30th, 2009, 11:35 PM

1200 Hz/2nd order is about it, so the M19's XO is a good choice if its horn system and basic box dims are used, which is a good choice for near wall locations and tune the vents in-room for best blend.

By 'updated', so you mean Marty's single box version of it or.........?

GM

**dc270** · August 31st, 2009, 04:35 PM

Originally Posted by GM

1200 Hz/2nd order is about it, so the M19's XO is a good choice if its horn system and basic box dims are used, which is a good choice for near wall locations and tune the vents in-room for best blend.

By 'updated', so you mean Marty's single box version of it or.........?

GM

Thanks for the reply so far- I have not found any specs on this driver to best guess the roll off characteristics so I was asking here. I knew what the specs were as Altec used them in their designs and was hoping I could stretch them out to 1.4~1.6k and use them in an "ecomowave" design. I have built the econowave design in 10" & 12" types with good success and now am wanting to push it into a 15" IF possible! Dinding that speacial driver horn combination in a waveguide design is my challenge.

I really like the sonics from the Altec woofer, as my Model 19's 416-B's really excell there. If this is possible in a wave guide I would like to possibly attempt it. The JBL LE 14 is a very good driver for a waveguide project, but I wanted something more mainstream in a near typical 15". If it is mot reasonable to wave guide a 15" them I am happy with a typical 811 horn & B&C DE250 config. Perhaps if I slope the driver with a 18 db/oct @ 1.4 it would fall into place.....

Thanks again for the suggestion/ reply
DC

GM · August 31st, 2009, 06:02 PM

You're welcome!

Well, it has more BW, but it's all break-up modes scattered around the diaphragm/dust cap, so no way to match it except in average SPL on axis. It's fine for adding a bit of 'fill' through the XO BW, but it wouldn't be something I'd want to listen to with an XO this close to our most acute hearing BW centered around 2 kHz plus WGs typically need to be toe'd in and off axis response of a 15" this high up leaves a lot to be desired.

You can of course mate a WG to a 15", it just needs to be a lot larger than the 'Econowave' to go lower to match up off axis, so a good rule-of-thumb is its acoustic mouth area should match the driver's acoustic piston area and be at least 1 WL long at the XO point or ~ the physical mouth area and length of a 511 (imagine that

).

GM

**dc270** · August 31st, 2009, 06:25 PM

I think I understand your acoustic physics explanation regarding the area and not so much the bandwidth. I have bever used the 511 lens, only the 811 briefly, but I am game for most anything. I honestly love the sound of these Alnico Altecs and would like to use/ compliment them in the best ways possible.

Thanks again GM
DC