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What is the impedence/signal level at headphone jack?

Trying to use signal at headphone jack as an input to another device. Concerned that headphone signal may be too high.

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A headphone jack is normally 16-32 ohms. If you are concerned that overdriving is taking place then turn down the volume level on the device. The connections should be ok. Just take some caution and keep you volume at around 50%-75%. You should be just fine.

B.S. Audio Engineering, Nick

Posted on Jan 23, 2009

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Can I connect my I phone to play music?


If your phone has a stereo headphone jack, you could use a headphone-to-RCA plug adapter cord to plug your phone into the auxilliary input port on your stereo receiver. I'm not sure what kind of sound quality you'd get - it depends on the impedances of the jack and the port, among other things - but it should provide at least a basic service. Of course, there are also stereo devices specifically built to boost phone output as well.

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Where is the line in jack for my Gateway MC7321u Notebook? Is it one of the headphone jacks?


Some computers have a special jack labeled line in. If your computer does not have a line in jack, you can use the microphone jack. You can then adjust the volume of the device in control panel under sound options. The headphone jack is only for output. I have seen some computers where you plug in a cable to the microphone jack and you will be asked what kind of device it is.

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I have a Tascam 424 mkIII that I just got in the mail today. Keep a long story short, the playback levels are really low in all outputs. I get a loud signal sound, though. What could it be? Keep in mind...


You may have a bad impedance matching situation. Check the level at the headphone jack for starters. If that seems low, there is a problem with the playback amp, which may be the same as the record amp in that model, I'm not sure. The switching mechanism that flips the amp from record to play may be hanging up. Start with the headphones. If that's good, your impedance match is way off, or you simply are using a bad cable, as it feeds from the same amp as the outputs in most cases.

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How do i connect my headphones? when i use a red/white tulip - jack out cable and then connect the headphones jackplug there is no sound, using the 'variable sound out'. should i use an amplifier like a...


If your TV does not have headphone jack outlet, then there is not much you can do, the Audio line level out RED and WHTIE RCA jaks are not made to drive headphone directly, it does not have enough power to drive low impedance load such as headphone which has about 8~32 Ohms impedance, the line out RCA is made to drive high impedance load 20,000 Ohms and higher.
If you want to use headphone, what you can do is to get cheap powered PC speaker system that has headphone out jack, then just connect the powered PC speaker to the audio line out of the TV, but the TV must have an option on the audio setup to turn off the built-in speakers.

http://s807.photobucket.com/home/budm/allalbums

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I have a white female rca and a red female rca which means right and left speakers hanging out of the back of my car audio cassette player. i can't anything out of them, nor can i get anything to go...


Hello joebobstgeor,

I wasn't able to lookup a manual for the Sharp GB960. In fact, manuals for any Sharp car audio product was woefully absent.

Try connecting the cables to the input of an amplifier. Female RCA jacks are used for low-level (preamplifier) outputs for subwoofers, sound processors, and additional amps. The impedance of the output is typically in the 20-25Kohm range and would not produce any sound in speakers or even low impedance headphones.

It's also possible that the RCA cables are an "AUX" input to the receiver and not an output. Although many of the mobile audio manufacturers are now using front-mounted phone mini-jacks as "AUX" inputs, some still have rear mounted RCA's.

Hope this helps.

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WHAT TYPE OF AMP?


Probably the easiest way would be to use a stereo receiver. You can run the headphone output of your ipod into a tape or cd input. The only thing to deal with will be adapting a stereo 1/8" (3.5mm) headphone type jack to 2 RCA type input jacks. You should be able to get this cord at radio shack. You might also be able to purchase a receiver that has a 1/8" input jack specifically for connecting things like an ipod. A receiver, by definition, has a tuner built into it. The alternative would be a tuner and an 'integrated amplifier' which has power amps to drive speakers as well as a pre-amp and input selection switching.


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Headphone out jack is really quiet.


Hi,

If you're trying to plug the speakers into the headphone connector that will happen.
Headphones are having a high impedance and those loudspeakers a low impedance.
That's why your volume is down. It stresses your audio-amplifier and even blow your finals.

Cheers,
Gerard

Jan 30, 2009 | Televison & Video

1 Answer

I have a P-85 piano that I wish to connect to my HS-80Mmonitor. The only output for the piano is the headphone jacks which I expect is about 80 ohms impedance. The input impedence to the monitor is not...


Generally speaking of course, you would never direct the signal from an amplified output into a line level input, however with headphones the level of amplification required is so small that the signal will typically be even less what a line level input is expecting. So do you want to headphone output signal further?

Basically, if you connect a headphone output signal to a several thousand ohm line level input it will behave pretty much like a line level signal.

Therefore, I would try it as is first to see if your results are acceptable. The output level should range somewhere within what a line level range should be although you might have to turn the volume up more than you would have to if it were a line level out.

Just start with the volumes all the way down, then turn your monitor levels somewhere in the middle and then turn up the keyboard level and see how good the sound is.

You may be perfectly happy with the results, otherwise you could try a headphone amp, but be careful with the volumes

Here's a good article on this topic which should address any concerns:

http://www.sweetwater.com/insync/techtip.php?find=2000-10-26

Cheers,

bd.

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You'll need an Audio Out connection on the tv for surround to work properly. The signal level and the impedence mismatch of a headphones jack would not work or work poorly.

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