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EV DH1A compression drivers
EV DH1A compression drivers
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Old 29th November 2005, 09:45 PM   #1
steve hawkins is offline steve hawkins  United Kingdom
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Default EV DH1A compression drivers

I am currently 'up-grading' my PA system, which is based on older style cabinets. I am happy with my Martin WSX subs, JBL4560 bass and Martin Philishave mids, but would like some advice on my choice of Horns. I have been offered some EV DH1A drivers on HP940 flares. I would be most interested to hear from anyone who has used the DH1As and their opinion on their preformance and limitations. My intention is to run them from 1700-6000Hz with Bullets above this.

Many thanks

Steve Hawkins
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Old 30th November 2005, 02:26 AM   #2
Magnetar is offline Magnetar  United States
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Default Re: EV DH1A compression drivers

Quote:
Originally posted by steve hawkins
I am currently 'up-grading' my PA system, which is based on older style cabinets. I am happy with my Martin WSX subs, JBL4560 bass and Martin Philishave mids, but would like some advice on my choice of Horns. I have been offered some EV DH1A drivers on HP940 flares. I would be most interested to hear from anyone who has used the DH1As and their opinion on their preformance and limitations. My intention is to run them from 1700-6000Hz with Bullets above this.

Many thanks

Steve Hawkins
I had the same drivers in the 640 horns and they were OK - Then I used them in heavy 350 hz cutoff round tractrix horns and they were excellent to 6k. On the low-end they didn't sound strained until used below 1.2K or 800 with a 24db electronic filter - I've been told the 940's are smoother than the 640's ... I actually have a pair of 940's too just never tried them -

- What are Martin Philishave's? I suppose you will still use them seeing the 4560's won't do much past 800 cycles?
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Old 30th November 2005, 05:46 PM   #3
thylantyr is offline thylantyr  United States
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Join Date: Feb 2001
Location: Mars
I have DH1 with HP640 horns and I really like the sound.
Typically on Halloween I install both horns on the outside
of the garage near the driveway covered with grill cloth
driven by 200w/ch amp. When the kiddies get close,
I crank the scarry halloween tunes and everyone jumps
out of their skin. It's strong enough to hear a few blocks away.
Sound quality is very nice. I would never sell these.

15 years ago, I used DH2 with HP640 horns in my van for a
concert type of car audio system. It was sweet. I miss those
days of punishment.



To add; I installed ferrofluid in the DH1 compression driver too!

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Old 30th November 2005, 07:07 PM   #4
steve hawkins is offline steve hawkins  United Kingdom
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Smile DH1A

Thanks for your help, it sounds my DH1As are pretty good. I have no idea what age they are but diaphragms are still readily available here in the UK. Interesting that you have ferrofluid cooled the voice coils, is this normal and does it affect the performance?
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Old 30th November 2005, 07:19 PM   #5
steve hawkins is offline steve hawkins  United Kingdom
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Join Date: Sep 2005
Default Message to Magnetar re DH1A

Thanks for your help and it's interesting to hear that the sound quality improved using the 350Hz cut-off horns. I am stuck with the original HP940 horns because they are already built into EV cabinets.
Martin Philishaves are a properly known as MH212s or M600s. They are horn loaded 2 x 12" cabinets fitted with phase bungs and a unique Y branch which combines the output of both drivers into a single large horn. They use RCF and ATC drivers and are very efficient over the range 200-1700Hz. The JBL 4560s only get used over the range 80-200Hz using BSS crossovers. Some may say that it is a waste to use the 4560s over such a narrow band, but they sound good and project well. The original JBL2220s have been replaced with PD154s which have the same QTS figures and Fs.

Again,

Thanks,

Steve
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Old 1st December 2005, 04:15 AM   #6
thylantyr is offline thylantyr  United States
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Join Date: Feb 2001
Location: Mars
I installed the fluid to boost power handling, it probably affects
frequency response one way or another but it doesn't mean the
effects are bad, could be better -- hehe

I torture my drivers so the fluid is a good thing.
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