Coral 4A-70 drivers

[richfoub]

Hi, picked up a pair of small AWA speakers each with a single Coral 4A-70 driver, wondering what else they might be better in? maybe a pair of folded horns? I have a plan from a German website I found years ago, think from memory I made a pair using some Realistic drivers and they sounded pretty good.

Richard

 

[planet10]

Pictures?

Dave

 

[gazzagazza]

Hi, picked up a pair of small AWA speakers each with a single Coral 4A-70 driver, wondering what else they might be better in? maybe a pair of folded horns? I have a plan from a German website I found years ago, think from memory I made a pair using some Realistic drivers and they sounded pretty good.

Richard

By chance do they have a piezo tweeter as well?

 

[richfoub]

No piezo tweeters, just the Coral drivers by themselves, one to each box.

 

[richfoub]

Hi Dave, how would these go in one of those Cornu spiral horns? I saw a post about someone building them with some kind of foam inside. Posted some pics of the drivers.

 

[planet10]

I have no real idea. They seem to be competing in the same niche as the Foster/Fostex F120a/FX120. If specs are similar one could likely find a Cornucopy design/size that would work. FE127 and FF125wk would also broadly fit that same category.

dave

 

[richfoub]

Looks like a pretty straightforward project. What is the foam stuff they use to make the folded horn? I'm in New Zealand so not sure what the equivalent material is called here.

 

[planet10]

Standard craft quality plastic corrugated cardboard.

Dave

 

[Cal Weldon]

If you are referring to the cornucopya as built here, it's called foam core board . It's paper faced polystyrene and comes in 20"x30" x 3/16" thick sheets and is found at dollar stores and elsewhere. There is an expensive version used as poster display boards but the cheap stuff is usually used to back a picture inside a frame. It costs only a dollar or two per sheet. Here's the thread if that's the way you decide to go. Dave also has good ideas about little drivers like that.

Ever think of building a Cornu Spiral horn? Now you can!

 

[gazzagazza]

No piezo tweeters, just the Coral drivers by themselves, one to each box.

Must have been after my time. I designed a speaker using a 4A70 and a piezo tweeter as a lunchtime project while I was there. The marketing guy liked it and they put it into production. I also did a PA speaker with angled front faces using 4 of the drivers on each of the two front faces. One set of those was used for PA duties by the Roger Fox Big Band for a few years.