[AMRadio] Headphones

Bill Guyger via AMRadio amradio at mailman.qth.net
Mon Aug 25 18:11:48 EDT 2014

I think the impedances a lot of newer headsets are driven (pardon the pun) by what chips are in the radios, amps, etc. The headsets you see sportscasters wearing on TV are generally Sennheiser HMD-25's at about $450.00 a pop......I own 4 of them for doing sports originations for NBA, NHL, and MLB radio broadcasts. Mine all have Sennheiser's standard 600 Ohm drivers since my headphone amps can deliver serious power to the higher Z phones. An acquaintance has to use the same headsets with 80 Ohm drivers since his amps are built around LM 386 chips operating barefoot where as mine have current booster transistors or IC Current Drivers driven by NE5534's. 

FWIW the reason the HMD-25's are the de facto standard is that they don't mess up the "talent's" hair since they're so light weight. Beyer 290's sound much better (at half the price) but they're built like Panzer tanks. I use the Beyer cans personally since they shut out the ambient noise and I can hear what I'm mixing better and I don't care about headphone hair. 

I'm pretty sure the ear buds you see the youngsters destroying their hearing with (or at least isolating themselves from having to interact with those around them) are pretty high Z too. 

Bill AD5OL 

On Monday, August 25, 2014 4:46 PM, Jim Wilhite <w5jo at brightok.net> wrote:

I haven’t dinked with headphones since about 1958 until today.  If you have the volume up too high when you plug them in, you can injure your hearing.  And a set of cans will, over time, do the same.  A good friend and fellow ham passed away and I am trying to help his widow sell what he had.  I bet there were 10 sets of headphones and this afternoon I tried to pair them with any equipment so as to enhance the sale a bit.

It was when I picked up a set made by (for) Telex that a label caught my eye.  They had 8 ohms on the label so I looked at another pair made by another company and it said 16.  What is the deal, are all manufacturers making headphones for audio and the audio builders making outputs the same as speakers?  What ever happened to high impedance phones?

Is this common?  He had a Heil headset with mic so that makes me wonder the impedance of them.

Can anyone explain.

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