Excal Phones Question

[cjc]

Anyone know what this gizmo is that used to be built into the end cap of the Excal? Did it change the impedence? Also anyone know what range the Excal phones operate at? 150 ohms seems to be the standard. I don't like how most of what's available grabs the low (ground interference) range in all-metal and am thinking of having something custom put together.
clive

 

["MR. GOLD MASTER"]

Its a High pass low stop audio filter, Its a capacitor and a resister , It lets the high frequency audio pass into the headphons with no reduction in volume while it attenuates(reduces the volume) of the lower frequency audio
What headphones were you using?

 

[cjc]

Thanks a lot GM. It's interesting that when you try to use GG's in all-metal (as a search mode), a lot of low-range stuff comes in from the ground making the signal to noise problem just too much. They are great phones but have this low tuning. This also brackets the tone into a narrow range with less distinction. Mind you a lot of disc hunters talk about how this helps on gold. Wish I could splice this baby in and try them again, because where you are in shallow water a/m gives a nice boost in depth--great for sidewalls. I appreciate your knowledge for sure--do you know if the newer Excals run at 150 ohms? Might try something custom. ( My bench guy hates me for even suggesting it but a good solid bribe goes a long way). Also, why don't the newer Koss's need the high / low?
Clive

 

["MR. GOLD MASTER"]

Clive I tried out a Pair of GG's for the first time today,They sounded crisp but to me the Low frequency audio signals like from gold or bottle caps seem to sound very treble and lacked that deep robust bass sound that I've been accustom too.i wasn't to happy at first with them but after a few hours i started getting use to them, I don't think using the minelab audio filter wouldn't help them.
minelab specs just say that the yellow headphones are high impedance but i think i read some were that they are 60 ohms
its the first i heard about the yellow headphones not needing the high/low it could be that the audio transducers they use have a narrower frequency response
my next project will be to make a pair of custom headphones using the yellow headphone koss audio transducers mounted in a more acoustically
friendly, comfortable pair of quality hearing protectors like a peltor H7a ,I think that will give me the right sound quality and comfort i'm after

 

[JoeinMemphis]

"Also, why don't the newer Koss's need the high / low?"
If you are referring to the blue " dingus" my new Excal2 has it, and it is marked "1 ( u with a tail - the micro symbol ) K 63" no spaces, and mine has the factory Koss headphones installed.

 

[Gulf Hunter]

MGM, you are right about the GGs not having the robust low tones, like the OEM phones did. I was somewhat dissappointed about THAT aspect at 1st too. I ASSURE you that in every other way, they are superior. Wind noise is gone, they stay on your head MUCH better, more comfortable and the signals are MUCH clearer/sharper and easier to hear, imo. I'm sure they have helped me to hear targets, that would not have been discernable, with the stockers. The more you use them, the better you will like them. I got 3 sets now, LOL!

Clive, as for the all metal gig, I'm not real sure they would help too much, but maybe you can figure something out with them. I have totally abandoned all metal on the Excal, as I feel like I'm gettng good penetration using the Disc mode in the Gulf. Not PI depth mind you, but good enough for the gold, LOL!

 

[cjc]

Thanks for your response Gold Master. It's looking like custom is the way to go as aside from your good old Bilsoms, nothing out there even stays on that well when a decent wave hits. I used to get great results from an old X2 Pro / WOT with Fisherphones in a/m --dimes down 20" or more and just a nice clean threshold that I have not been able to duplicate with my Elite or Excal. Just seemed like the right detector / impedence combination. Let me know how your project works out.
Clive

 

["MR. GOLD MASTER"]

Did a test run with the GGs again ,came to the decision that their definitely not for me. I,m looking for gold so i need headphones with a good low end bass response to hear all the gold Low tones, the GGs are way to trebled with a very weak low end response, not looking to miss gold so back they go.
next step was to make the new set of headphones , used a pair of peltor H7a, high comfort liquid gel filled ear pads, nice 27dbs noise reduction. took apart the yellow koss"s and used the audio transducers and in 3 hours made these superior sounding, fitting headphones
bench tested great, will give them a field test tomorrow.

 

[cjc]

GM--the Koss's do have an okay response. I found that the GG's don't give you that low tonal range ID capabilty that is the soul of the Excal although the response is very sharp and clear. Way too many targets sound good as well as you say, not enough distinction. For some reason they also feed back from the ground in all-metal. Mine went on the 'Cuda and are excellent there. Think I will be making something custom too once I find out the ranges and specs. Those Peltor shells look pretty good--how do they grip?
Clive

 

[MikeDahms]

Did a test run with the GGs again ,came to the decision that their definitely not for me. I,m looking for gold so i need headphones with a good low end bass response to hear all the gold Low tones, the GGs are way to trebled with a very weak low end response, not looking to miss gold so back they go.
next step was to make the new set of headphones , used a pair of peltor H7a, high comfort liquid gel filled ear pads, nice 27dbs noise reduction. took apart the yellow koss"s and used the audio transducers and in 3 hours made these superior sounding, fitting headphones
bench tested great, will give them a field test tomorrow.

I don't yet own a Excal so this is not direct knowledge. I do have a lot of experience using head phones and one thing that comes to my mind is each of us have hearing loss. Depending on our occupations and life experiences certain parts of our hearing range is affected and we are weaker in those ranges. This can certainly cause a difference in preference in head phones from one individual to another. This is an interesting thread and let me say thank you all for your contributions. Mike

 

[Sand Scoop]

Hearing loss is my main problem since I worked around heavy equiptment with out hearing protection.My stupidy as I learned. The one problem I have with my Excal II is to get them to fit snugly on my ears . Gold Master mentioned liquid gel filled ear pads. Can I buy these to fit the Koss Headphones?? Since the Ol hearing isn't great anymore these ear pads would help I think when water hunting and the waves are pounding. A snugger fit would keep the outside noise from interfering with me hearing tones.

 

["MR. GOLD MASTER"]

SS if your looking for a tighter fit on the koss headphone you can do a simple mod like i did on the koss phones for my explorer in this photo ,it will make a major difference in the tightness of the fit, nice and snug, i got hit by lots of big waves and they never came off.
I removed the koss head band and replaced it with a peltor headband, i mounted the band with 4 small stainless steel screws,and also did some sound proofing to the inside of the yellow ear cups. i didn't use the peltor ear gel pads they are slightly smaller then the koss but when push comes to shove they could be used if you silicon them on.

 

[Tippy]

Just finishing on CNC'ing a few end caps for myself. I would be most appreciative to know what the capacitor value is for the stock blue headphones.