a couple of questions?:ausflag:

[blowfly1967]

what is the ohms output for ,both the compadre and vaquero in relation to matching earphones to the detector in use?


are the compadre and the vaquero both wired at the earphone jack in stereo or mono?


hh blowfly

p.s.for the hearing impaired try this koss eq 50.it's worth a look!

 

[trueblue]

g'day blowfly , I reckon they'd be in mono ..... if ya after a pair of phones ....I got a bran spankin new pair Sunray Pro Golds if ya interested drop me a pm .

 

[MatthewS]

what is the ohms output for

Amplifiers do not produce 'ohms' so we can clear that up right away. They produce voltage, or current depending on the amplifier used, both with a relationship to wattage. When presented with a 'reactive load' such as a speaker the impeadance (ohms) of the load generally plugs in the last number for the power equation.

,both the compadre and vaquero in relation to matching earphones to the detector in use?

Impeadance matching is not important here. It would matter if you were feeding the output into another amplifier, but not a reactive load. At least not in this instance as no typical set of headphone drivers will dip down into an impeadance that these amplifiers cannot handle. Speaker efficiency plays a great part in volume produced but the relationsip must be shared with a lower impeadance as well. Generally the lower the impeadance you place across the amplifiers outputs the greater the yield. But the extra yield is useless if the speakers efficiency sucks. To make matters more complicated in chosing, most manufacturers won't even publish these specifications for you to compare. Ideally if you want to get louder, lower impeadance and greater efficiency are two goals to strive for when chosing. The amplifier will produce greater yield and the speakers will use it more efficiently.

are the compadre and the vaquero both wired at the earphone jack in stereo or mono?

All detectors that I am aware of are mono by design. But generally they use a stereo jack to support the usage of the more current and popular stereo headphones because the plugs themselves require this support. But the same sound phase is being pumped down each pathway so no matter what you expect, know your getting mono sound.

hh blowfly

p.s.for the hearing impaired try this koss eq 50.it's worth a look!

The Koss unity gain EQ is nothing more than a powered EQ. However 'amplifier' and 'EQ' are quite loosely used here. The Koss uses a 'unity gain' apmplifier which is an amplifier with no gain at all. So it's not really amplifying anything at this stage, but rather acts as a buffer to isolate the effects of the EQ from the input signal. The 'EQ' is simply a three tone form of boost/cut control. Because it only uses three bands of adjustment and because they do not overlap by design it is impossible to use all three, even at maximum setting to gain a uniform boost over the entire frequency range. Only three select wide bands can be used. Now you may perceive this as amplification, but bear in mind the entire spectrum must be amplified to be considered amplification. So what your getting is three select bands to amplifiy, and not the whole shebang. Worse yet you need to supply it with power.

If you were to omit that device and simply chose a pair of headphones with HALF the impedance of your old pair, but similar efficiency of the drivers used you could concievably DOUBLE the volume output. Thats right I said DOUBLE. So it's more of a game of knowledge rather than marketing to make the right choice for you. Don't run out and buy things unless you know exactly what your getting. That koss model doesn't even provide specs that I can find on at what frequencies the adjustments are for. It claims 10db of boost ability which is a gain of roughly 3, but again we have no idea what ranges this occours in. Furthermore it claims total output is 20mw but that is comparable to the output capability of the op-amps in your detectors. Bottom line is I won't be buying one anytime soon. I could fabricate a full bandwidth amplifier with over a watt of output with a handful of parts from radio shack, a small project box, and very little of my time; it would also include a gain control. For those who are not handy in electronics, there are other more reasonable solutions. But I would recomend more careful headphone selection and if that doesn't get you what you need, look into a small portable power booster, not an EQ.

Hopefully I was thorough enough and I tried to be as 'laymen' as possible, but I'm a techy..

- Matt

 

[tvr]

Headphone efficiency may play a very significant factor too. I went from 8 ohm Treasurewise to 60 ohm Koss and got a lot more volume with the Koss. Neither has efficiency specifications that I could find, but I suspect they are a lot different.
tvr

 

[blowfly1967]

well mathewS,i'm not a techy and my tail is now between my legs.thank you for the information though .apart from you and monte i have no one to lean on,so some of my questions tend to stir up those that know more than me but i get results.

i was reading on a site that you should match the ohms impedance of your earphones to that of your ohms output of your detector to get as near as perfect match.i thought that was the way to go.my hearing ain't what it used to be .blowfly

 

[MatthewS]

Headphone efficiency may play a very significant factor too. I went from 8 ohm Treasurewise to 60 ohm Koss and got a lot more volume with the Koss. Neither has efficiency specifications that I could find, but I suspect they are a lot different.
tvr

It does, and I probably wasn't thorough enough.

In short, 'loudness' can be increased by changing one of several factors.

a) Driver impeadance (ohms)
b) Driver efficiency
c) Driver size
d) Output power of amplifier into said impeadance.

I won't mention enclosures because it is presumed that the efficiency ratings were taken while the drivers were enclosed and thus the rating is a sum of the whole. Now I will touch base briefly on each one. Each letter represents the explanation of the above letter.

a) Every time you halve the load to the amplifier the output will attempt to double given the amplifier is capable. Going from a 16 ohm pair of drivers to an 8 ohm pair will attempt to double the yield of the amplifier.
b) A 3db increase in real world terms is achievced by doubling the power of the cone area. If a driver of 1" size has an efficienty rating of 90db and another of the same size a rating of 93db the 93db driver should be twice as loud given all other parameters of the drivers are exactly the same. a 3db increase is a lot more than more people initially think.
c) As stated in 'B' we can gain volume by increasing cone area as well. if your going from a 1" driver to a 2" driver, and of course again given all other parameters are the same, power, enclosure, etc; the 2" driver will be twice as loud as the 1" driver.
d) Does not really require much attention here.

In essence, in our situations in particular I would recomend chosing the following 'best of the best' combination when comparing. So try and get the best blend of the best match to the criteria.

1) Noise isolation. Get the pair with excellent noise isolation. When you put them on, what do you hear around you without anything coming out of the speakers? Thats criteria #1.
2) Driver size. While earbuds are particularly small, enter the ear canal and thus couple with your eardrums you would think this isn't an issue. That said a properly designed pair of muffs will couple quite well and contain much larger drivers. They are getting 1.5"-2" drivers into fairly small footprints these days. Should be no reason you cannot get a pair of these that are light weight, contain large drivers, and provide the outside noise canceling mentioned above.
3) Driver efficiency. Look for the best efficiency now after you narrowed down the above criteria. The higher the efficiency the better.
4) Impeadance. Taking into consideration all of the above, now find the lowest impeadance rating of your choices.

Once you have the best of the best isolated, you have your headphones. At least in theory. You should have a large driver in a tolerable footprint, good outside noise reduction, high efficiency, and low impeadance. I fyou can't get loud enough results fromt ha combination, you need a medical workup.

- Matt

 

[blowfly1967]

thanks again,mathewS. it's not the loudness i'm chasing,i think,it's the audio tone.to be able to hear the difference in the tone from one target to the next,so i have a rough idea what i've found in the ground before commiting myself .everyone talks about the suttle difference in the responce. mine are all flat ,dull.i still dig them. blowfly

 

[Furious T]

hi blowfly, I think I know what you mean when you say "to be able to hear the difference in tone from one target to the next". I mostly use for my Tesoros earphones which have a volume control. (beffore I go on I'll just say that my knowledge of electronics could be put on the back of a postage stamp and you'd still have lickin' space). I too have ears which dont work as well as they used to (or else everyone else just whispers and mumbles all the time). What I do is to adjust the volume control on each headphone so that the loudness to my ears is equal (as possible).. I then reduce the volume on each phone so that the overall volume is as low as possible, but still audible above outside noise..this way I can pick up differences in the sounds that the detector gives in response to targets. If you have the volume too loud, it's much harder (close to impossible) to pick up those subtle differences..experiment with a few different coins and things in your backyard and you'll see what I mean. You have to be careful in lowering the volume on the phones so that you dont miss deep or tiny targets altogether...I guess experience is the best teacher (who said that?) HH Sapper.

 

[blowfly1967]

hey sapper,nickname or old rank? i have killer bee's 11,with the volume turned down,they work well on my vaquero and silver sabre.however on my compadre the sound is dull and flat.there is no subtle difference in the tone.i think my hearing doesn't handle much above 500hz. blowfly

 

[Furious T]

G'day blowfly, nickname, from about 40 odd yrs. ago. The headphones I have are RPGs, PH - 100R (whatever that means). They're made in Taiwan, so I guess they're not the brightest & best, but they work pretty well on all of my Tesoros. I dont have the Compadre, so I cant be much help there. I got my headphones from David Bishop, when he was the Tesoro Distributor in Aus. and dealer at Wodonga. His business was taken over by Paul Knee, who now has the Tesoro distributorship called North East Metal Detectors, Ph (02) 6059 1666. Paul is a top bloke who will help you if he can, either with the headphones or the Compadre. You may have already made his acquaintance if you have three Tesoros. I also got a set of the same headphones from Jack Lange metal detectors, so they are not unique or rare, costs $35 to $40 last time I bought a pair.I know that good headphones can make a difference in the way you hear signals. I have a set of phones (stick in your ear type ones) that I cant use with the Tesoros because there is no volume control on the phones and none on the Tesoros. These little phones have made a difference (I'm sure) in finding gold rings with one of my non-Tesoro detectors. Talk to some of the dealers. A lot of them sell Tesoros as well as other brands (eg Minelab, Garrett) and there should be one who can make a suggestion. Give Paul a call if you want to talk about the Compadre. I'm pretty sure he's sold of few Compadres, so he might have some feedback on them, if not he could make an enquiry for you from Tesoro in US. All the best, Sapper.