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Hi!

I've bought a JVC player (XL-SV22BK), and connected it up to the TV and amp/speakers, but unless I boost the microphone signal by sticking it through a guitar amp before it goes into the player, the vocals are far far too quiet to be heard. Should this be necessary? Are there special microphone pre-amps that must always be used alongside the player?

Thanks!

What model mic?  Wireless mics don't work with that player.  It is also a high impedence input so something like the Shure SM58 won't work as good as it should as it's a low impedence mic.  Cheaper mics such as those found at Rat Shack are often high impedence & may work better.
Otherwise recommend getting a small mixer for your mics & player.

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Condenser mics are just as bad and are a common mic.

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Wow! Fantasticly quick response . One of the mikes is an AKG 3700, and the other is, err, some unknown 50's style one (which requires an even higher signal boost).. I'm not sure if a different microphone would make any difference though. Without the guitar amp in the circuit, you can not hear the microphone at all, and considering I'm using the headphone out of the amp, it's giving it one hell of a signal boost!

Shouldn't have to boost the signal that much at all.  The only thing you are going to end up doing is frying your input circuit (possibly more).  You may have a defective player.  The AKG is a low impedence mic, but still shouldn't need to turn the input up that high.   If you just bought the player, i'd exchange it for another to see if that's the problem.  But before you do that, check the mic cord for shorts, may need another.

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Hmm Mic Cord's wear short's?

Just a thought but try hooking the mic to the guitar amp and sing from that. or atleast test the mic from there.

Im no technician but thats worth a try.

I would get a mixer to go between the player and the amp, something like the VocoPro Da-1000 pro. Those mike inputs were not intended for anything but home use and even then are preferably not what you want to use.

You must have a mic pre amp before the amp to increase the mic output to "line level".

Any mixer will have several mic pre amps built in...one for each mic channel.

Go to Musician's Friend and get you a small mixer for 50 bucks with free shipping included.

Singing thru a guitar amp can't sound all the great. Guitar amps are designed to distort sound.

He;s hooking the mic up through the players' input, which isn't great but should work.  Doesn't need a pre-amp for this, it's built in the player.

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If he is using the built in player mic jacks then he needs to connect a properly matched  mic to the player's mic input and also to make sure he cranks up the player mic input knob. JVC site gives no info about correct mic(that really sux)

Best bet is to get a real mixer even if small and cheap, and a pro type low Z mic with XLR connections for the mixer.

This can work, cos I had tried it with an old  g'tar amp. You can get a nice analog efx on the vox tuning those knobes.

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Looking at the schematics the jvc has a single stage NJM4580dd IC for a mic preamp..For max gain it has to run at the higher end which tends to put it in the non-linear or distortion region...

The JBL eon g2 has a six stage preamp incuding 3 NJM4580dd's and 3 other IC's A multi stage amp operates in the linear portion at medium gain..  It is designed with the proper amount of negative feedback and thus is a very stable amp...

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I agree there, however, all I was getting at is I have the same player and the cheapy mics tend to work better in it over the more quality mics - oddly enough, but have never had to crank up the input more than 10-11 oclock, I am willing to bet he either has a bad cord or a bad player.
The RSQ model you can get a spec sheet from their site.  It's the same as the JVC since JVC makes it.

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Sorted it!

Needed to use a F XLR -> Mono jack, and I was using stereo jacks.

Thanks for your help .