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Reviews Categories | Headphones & Boom-mic Headsets | David Clark H7051 Headphones Help


Reviews Summary for David Clark H7051 Headphones
David Clark H7051 Headphones Reviews: 3 Average rating: 5.0/5 MSRP: $150
Description: Noise attenuating, listen-only headphones
Product is in production.
More info: http://www.davidclark.com
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NOTICKETYET Rating: 5/5 Jan 7, 2002 14:11 Send this review to a friend
H7050 has std conn  Time owned: more than 12 months
The H7051 and the H7050 are designed for communications in noisey surroundings.The Davidclark Headset H7050 is similar to the H7051 but has a standard 1/4 phone mono connector similar to Switchcraft M642/4-1. The problem mentioned by the intial reviewer is due to the connector on an H7051 which is made for most Helicopter connections. The connector on H7051 is a U174/U . I suggest most hams would want the H7050 headset with a standard 1/4 phone connector M642/4-1. The MSRP for the H7051 is $155 and the MSRP for the H7050 is $152.
An additional alternative would be the DC-100 headset which is a HI-FI stereo headset with a 1/4 phone stereo connector (also called a TSR- Tip Ring Sleve) connector. The DC-100 Stereo headset has an MSRP of $225. David Clark headsets are designed to be used in noisey applications from Helicopters to the the deck of an Aircraft carrier.
Many other application specific Headsets are available at David Clark Co Inc at www.DavidClark.com ranging from headsets used on the SR-71 Blackbird to Fire and Rescue communication headsets.
Most David Clark products are listed on the web site along with parts lists, schematics and performance data. see www.DavidClark.com
 
W0FM Rating: 5/5 Jan 7, 2002 11:49 Send this review to a friend
Top of the Line  Time owned: more than 12 months
These are great commercial grade heasets. Many of my commercial two-way radio customers (EMS, Fire, Heavy Construction, Indy Racers, etc) specify only David Clark headsets. I have used these headsets for over 15 years. They are of excellent quality and can really withstand a beating. David Clark backs their products to the hilt. Excellent design, but not cheap in construction OR price. Many hams won't justify the cost.

Just FYI, John, the short (3') cords you mentioned are that way because the short cable on the headsets is designed to plug into a "Radio Interface Cable" which is a much longer cable that has a plug on the far end that is compatible with the specific radio or apparatus intercom box that is being used. These two cables combined make up what you or I would call a "normal" length headset cable. 73, Terry, WFM
 
N5DF Rating: 5/5 Jan 7, 2002 10:54 Send this review to a friend
Great Noise Attenuating Headphones  Time owned: 0 to 3 months
Some men, when they reach middle age, buy a fast, red sports car and chase after young women.
Always different, I bought a large (it rolls around the floor on casters!), high-power amplifier to soothe my mid-life idiosyncrasies. In addition to lots of RF power and heat, the amplifier puts out a copious amount of blower noise, unfortunately. When added to the racket generated by my computer, the blower noise made operating difficult. What is a poor ham to do?

Noise attenuating headphones are the obvious solution. However, a quick search of the available ham catalogs produced disappointing results. With their emphasis on low cost and wearing comfort, headphones marketed to hams do not "cut the mustard", at least when it comes to the attenuation of external noise. I knew it was time to "move upscale" and investigate headset gear in the general, commercial and military aviation markets.

Hollywood provided me with some basic guidance. On TV and in the movies, many pilots wear similar-looking, light-green headsets. Military pilots wear them too (on CNN, the next time you see the President exit/board Marine One, you may see the pilot wearing a light-green headset). Also, check out shuttle astronaut Susan Helms, KC7NHZ, on page 102 of the Dec. 2001 QST. A quick web search yielded the answer. The light-green, large headsets come from the David Clark Company (not to be confused with the similar-named, 60's era rock group!) of Worcester, MA. You can check them out at http://davidclark.com.

A search of David Clark Company's web site produced a profusion of different models to choose from. I wanted a listen-only (no boom mike - I am a CW OP), low-impedance (many of the David Clark headsets are high impedance) headset that offered good passive attenuation of external noise. The model H7051 seemed to fit these requirements. A further web search yielded a number of pilot/airplane shops that carry the David Clark line. I placed my order.

The H7051 works as advertised!! They use a novel, twin noise-barrier technology that produces an NRR of around 24dB. Their high-frequency attenuation is around 30dB. They block out all of the high-frequency blower noise (the blower runs at approximately 3000 rpm, and there is a lot of high-frequency noise generated by air passing through my 3CX1200A7). They eliminate almost all of the low frequency noise (sub-harmonics from the blower motor???). With the H7051 on my big head, all I can hear of the external noise is a faint, low-frequency rumble (the amount of external noise attenuation is dependent somewhat on the fit/position of the
headphones; position them to find the "sweet spot".). Finally, the quality of material and
workmanship is first class; the H7051 is well worth its price! I am a satisfied David Clark
Company headphone user!

Besides a price that some hams might not want to pay, the only disadvantage of the H7051 is a
tight fit. If, like me, you have a big head, then you might find the H7051 to be a little
uncomfortable after long periods of operating. But, this is a trade-off that I can live with.

My H7051 came with a short cord (around 3 feet long - in their cockpits, pilots do not move
around much, I guess) and a non-standard (in the amateur-radio market place) phone plug. From Allied Electronics, I ordered a miniature Olympia coiled cord (same color and diameter as the H7051's cord) and a standard 1/4 inch, mono phone plug. With black heat shrink tubing and a little work, I made a professional-looking splice to extend the headphone cord length. This time, perfection was achieved easily!

In summary, the David Clark Company H7051 costs a little more, but it is well worth the money.
If your shack noise level is troublesome, then you might consider this pair of headphones.

John, n5df
 


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