headphone speakers

[Au79finger]

I have realized its time to ask the experts.Although I am mechanically inclined I find electronics very challenging.I am trying to understand how to select the correct speaker or piezo element in order to make a pair of headphones.I water hunt with an Excalibur ll and have made several pair of headphones using piezo elements and mini speakers but none are satisfactory.Now I am trying to understand how to "match" the correct speaker/piezo to this machine.Minelab states the stock headphones are 8ohm.I find many 8ohm speakers online but they have different frequencies,power ratings, sound pressure levels and such so choosing is difficult.Do I need to know the frequency,audio output, watts and such of the detector first?What determines the "range"(wider the better for me) of sound?What determines sound quality?Will increasing the speaker ohms increase sound quality?So I am basically ignorant of how different speaker/piezos will perform with this detector and seeking any help in understanding how they work or in choosing the correct one. Thanks for any help.

[Kjamesgraham]

Hello...
Check out this link. A very thorough discussion.

http://www.arizonaoutback.com/azoroo....aspx?recid=75

Ken

[SVEN1]

That's a very interesting read!!
Thanks for the link

[mikebg]

Please don't DIY

Au79finger, you waste time. Please don't try to improve headphones designed by Koss Corporation.
They are leaders for more than half century. Simply contact with them and explain what you need.
http://www.koss.com/en/support/choosing_headphones#
You need 8 ohm Koss headphones for underwater search.

There are only two sentences for headphones in Excalibur manual:

"Ensure that the vent holes on each headphone diaphragm are rinsed and clear of
sediment. This is critical to allow for ear equalization when the Excalibur II
is used for underwater detection at depth."

[Au79finger]

Hello...
Check out this link. A very thorough discussion.

http://www.arizonaoutback.com/azoroo....aspx?recid=75

Ken

Ok I have almost recovered still a little shaky and dizzy but improving.It only took aspirin,excedrin,tylenol,a few headbutts to the wall and a couple of hair pulling episodes but I managed to read it all.Thankfully there were a few sentences on the bottom shelf and I was able to obtain the information I was seeking.That being match the speaker/headphone ohms to that of the detector,wide frequency range and the higher the sensitivity(db) the better.
Thank you all for the replies.The help is much appreciated.