EV 8HD Horn Lens- What Driver To Use?

dc270

dc270

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I have stumbbled into a nice pair of EV DL12W woofers. The have a decent low end of 45hz, spl of 96db, 300 watts etc.

http://archives.telex.com/archives/EV/Drivers/EDS/DL12W EDS.pdf

What I THINK I would like to try building next is a 3 way high efficienty system using the EV 8HD horn lens with the EV T350 tweeter and this woofer in a compact 2. cu ft net box. My question is what mid driver, 1.75" , 18 tpi (prefere 8 ohm) would you reccomend? It does not need to be an EV type, like an 1824 or 1823M, but smooth sounding would be nice. The xover would be in the 800+ hz area on the low end and some where around 5~6k on the high end. Probably 12db'oct slopes as well.
I chose the 8HD, woofer & tweeters because those are the items I have on the shelf now- if you have an alternate suggestions I would be open to that as well.
Thanks All!
DC
 
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Any of the EV drivers with phenolic diaphragms would be my first thought. You don't need high-end extension (as long as it gets to 6KHz, you're fine)... and you need rugged, clean bottom end (down to 800 Hz). IME, the phenolic drivers do this very well...

Regards,
Gordon.
 
So would this be the 1823/24 series you are refering to Gordon? I am not sure what other 1" drivers EV offered other than these that I have used and know about.
DC
 
That's the drivers (1824's) I used about 20 years or so ago when my uncle and I built some home made La Scala's. We used the T35 tweeters but I can't recall which woofers ended up going in them.
 
Hi MRH, I am using the T25 with the 8hd. The driver is fine but I am not satisfied with the 8hd. After owning a pair of Edgarhorn 350hz tractrix horns,, the 8hd sounds way to honky for my taste. I am now trying to find a tractrix horn that will fit my systems physical space. Cheers.
 
I have heard the "honkiness" with some drivers on these, namely Solenium brand- but the 1823M was actuall pretty good sounding at xover of 1K/ 12db/oct! The horn should be placed verticle for correct dispersion. See where this goes.
DC
 
My 1972 E-V catalog states that the 8HD is specifically made to work with the T25A. Cutoff is 600 HZ, but I would go 800 or maybe higher. The DL12W should work just fine up to 1KHz.
 
tarior said:
My 1972 E-V catalog states that the 8HD is specifically made to work with the T25A. Cutoff is 600 HZ, but I would go 800 or maybe higher. The DL12W should work just fine up to 1KHz.
Click to expand...

Sooooooo . . . . does this mean the EV 8HD's I've found in old MAgnaovoxes are T25's ? the driver is glued on as opposed to screwed. . . .

I'll have to post some pix . . .
 
markus said:
Sooooooo . . . . does this mean the EV 8HD's I've found in old MAgnaovoxes are T25's ? the driver is glued on as opposed to screwed. . . .

I'll have to post some pix . . .
Click to expand...

Glued?:scratch2::headscrat
 
tarior said:
Glued?:scratch2::headscrat
Click to expand...

yup .. . I was baffled the first time I saw it too .. .

From what I can tell, from 1954 to 1957 the Magnavox consoles that used the 150XX Bi-Amp monoblock would use either two 12's and a 15, and either a jensen RP103 or the EV 8HD horn with a driver glued, or epoxied onto the throat . . . the earliest stereo (pre-Concert Grand) Console I have actually uses one EV, and on the other channel uses a Jensen RP109 (WEIRD!)

I gotta get into the basement tonight to unearth a pair of Large Advents for a friend - I'll snag a couple of these Magnavox EV 8HD's . .. .
 
dc270 said:
So would this be the 1823/24 series you are refering to Gordon? I am not sure what other 1" drivers EV offered other than these that I have used and know about.
DC
Click to expand...

The 1823 preferably, but the 1824 should also work (smaller magnet than the 1823, but for this application, probably will be fine).

Other than that, you might be able to score some of the JBL phenolic drivers (2460/2461) relatively cheaply... most people shy away from them because of their lack of HF response (they drop like a brick around 10KHz). In your case, that's darn-near ideal... since you have the ST350 to take care of that. You'd need to use a bolt-on/screw on adapter with the JBLs... but that should still be just fine...

Regards,
Gordon.
 
DH3 is good for highs. But for mids you would need some thing bigger maybe DH2 dont think it would fit 8hd horn you can try HPT64 for highs and HP64 horns. Ihave HP940 and DH1A drivers

Darren
 
Why not try an econowaveguide on top of there? Cheap as hell, well under 200.00 for both sides and really nice sound. Read the thread, you will find it interesting.

Russellc
 
dc270 said:
I have stumbbled into a nice pair of EV DL12W woofers. The have a decent low end of 45hz, spl of 96db, 300 watts etc.

DC
Click to expand...

Here is an EXCELLENT driver that will fill the bill. Even though it is rated 93 db/wt SPL, it is really a few db hotter than that. It starts about 600 hz, and goes up to 20 khz. Power protection circuit up to 400 watts. I've used it in a number of 2-way systems mated with 96-97 db SPL woofers with good results.

This is the CTS KSN1188a piezo driver. There are some cheap clones that are not anywhere near close to the real 1188, so don't fall for the bait and switch. Here is the real McCoy.

http://www.martinsoundpro.com/item.asp?id=340

To use it with your crossover simply wire an 8 ohm 20 wt resistor across the terminals so that it acts like an 8 ohm load to the crossover.
 
Hey Paul-

That driver looks quite interesting!! Do you know where there is a freq plot on it? I have heard that the good Piezos actually are not bad= this may be certainly one of those as you have suggested! I am wondering if the higher freq will still propigate well in this 8HD lens. I know this is a difficult lens to match to but I am on a budget and really want to see if this lens can't be made to work adequately.
Thanks for the idea here- it certainly is unique and out of the box, I like that! A plot would really help me though-
DC
 
Here is a plot on a plastic horn quite similar to the EV horn.


attachment.php


Over the years I've seen the KSN1188a used successfully on the EV horn (and the EV copy) on a number of speakers. The high end does surprisingly well.
 

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Thanks Paul- this looks like a real contender!! Above 10k it gets a bit wild but I could still incorperate the T350 above 5k and have what looks to be a real solid system. The power handling looks very good as well.
If I used this 1188 as a mid driver (as suggested above)- what xover scheme would you suggest? A natural roll of on the 1188 driver with no low end cap (except for the roll off on the woofer) and only a cap for the 5k high end and a -12db/pct for the T350?
Thanks again
DC
 
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