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moray james 18th April 2013 10:07 AM

EV driver info help
 
am looking for an EV driver with a two inch diaphragm and a one inch exit. What is the difference between an EV DH2 with the cup removed and an EV DH2MT and an EV DH2AMT" I need a standard one inch screw on snout with a one inch exit ID. So which one do I get for smooth response? There is also the DH2A the DH2AS1 It is very confusing. Thanks for the EV for dummies cheat sheet. Best regards Moray James.

JMFahey 19th April 2013 01:31 PM

All DH2 variants seem to be the same basic magnet and diaphragm, with different "exit" (adapters/mounting) options.
Actual frequency response plots are quite similar, if not the same.
Remember they suggest their active equalization for flat response.

moray james 20th April 2013 12:31 AM

Thanks JMFahey. I am trying to find out if a DH2 with a nose cup (short or long) is the same driver as a DH2AMT? The DH2AMT has a standard threaded 1 3/8" threaded snout with a one inch exit. The DH2 has a nose cup (short or long) and it is a bolt on with a 1.94" throat. So is the DH2 simply an AMT with and additional expansion flange and a cup to cover the adapter up? Thanks for the help. Best regards Moray James.

airguitarchamp 27th April 2013 01:37 AM

Quote:

Originally Posted by moray james (Post 3461262)
Thanks JMFahey. I am trying to find out if a DH2 with a nose cup (short or long) is the same driver as a DH2AMT? The DH2AMT has a standard threaded 1 3/8" threaded snout with a one inch exit. The DH2 has a nose cup (short or long) and it is a bolt on with a 1.94" throat. So is the DH2 simply an AMT with and additional expansion flange and a cup to cover the adapter up? Thanks for the help. Best regards Moray James.

Not sure if any of this will help but two things;
-EV made the dh3 which was a 1" threaded driver... I believe 2" diaphragm. Was normally used as a supertweeter, had higher cutoff and lower power handling, etc, maybe that will be something that will fit your needs?
-The "MT" was denoting manifold technology, and the reason they used the 1" screw was to screw 4 of those drivers onto a manifold which went onto a 2" exit horn (see MTH-4?) The screw arrangement was needed to get the spacing closer for mounting the drivers on the manifold. But I cant concretely substantiate they are exactly the same as the longer snouted models...

moray james 1st May 2013 02:01 AM

Thanks Airguitarchamp: yes the DH3 is a smaller diaphragm (1.25" dia.). I am looking for at least a two inch driver as I would like as low a crossover as possible so the DH1A is actually even more attractive from that point of view. Thanks a lot for your input. These are old drivers now still very high performance but old never the less so I don't imagine there are a lot of people running them now. Best regards Moray James.

w_oswald 1st May 2013 03:59 AM

Moray:

Have you considered the EV DH1506? That seems to meet all your criteria: 2" diaphragm, 1" throat (with 1-3/8-18 male threaded end), and can be crossed quite low: 500 Hz. min., 800 Hz. recommended. Overall, it specs out quite similar to DH1A (which has a 1.94" throat dia. b.t.w.). DH1506 seems to be quite a bit scarcer than DH1A; same goes for replacement diaphragms. I can send you a data sheet if you need.

Wilf

moray james 2nd May 2013 06:17 PM

W_oswald: thank you for your reply. Yes the DH 1506 is on the list but as you mentioned more DH2 than 1506 are available. There is also a DH 1506 HP (high performance) more rare still. The 1506 that you do see are more expensive. and it looks like the 1506 is just a little smoother but not by a lot.
I ended up buying a pair of DH1A a few days ago for a very good price. These are 3 inc diaphragms and yes your are correct nominal 2" exit actually 2.94" exit. How ever if you remove the nose cup extender you revert back to a 1.4" bolt on so you get some versatility there and lots of 1.4" horns to play with. These are monsters weighing in at 23.5 lbs each, that's a big tweeter.
For the kind of money that DH1506 and even clean DH2 go for I think I will keep an eye open for some used or perhaps even new Beyma drivers. Beyma have some very fine looking drivers with flat smooth and extremely extended response (both directions). For now I think that the DH1A will make a fine reference and I expect that when properly set up will prove very hard to beat. Bonus is that the EV parts are NA sourced and all the revenue even of used sales stays at home and I like that.
Thank you to those who have responded to my post. Best regards Moray James.


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