Dan,
I pretty much agree with Lonman but I have to put my 2 cents in.
First, how much power does your receiver put out?
How many watts at what impeadence?
Most pro amps go down to 4 ohms, and a few go down to 2 ohms.
Most home receivers go down to 6 ohms and a few go down to 4 ohms.
I agree with Lonmans recomendation to get a single drawer player, but I don't care for Peavey. I think that Peavey is over priced for what you get, and overated. I like Carvin. Carvin's 10" speakers run about $140. Thier 12"ers run $200, and the 15"ers run $250.
There are many things to consider when buying speakers, like size, weight, power handling, etc. I would recommend that you stay away from 3-way speakers, and stick with 2-way speakers.
Lonman will not stear you wrong.
Knowing how much power your amp puts out is rather important.
I must mention that the mic inputs on karaoke players are a joke and you should think about getting a small mixer. Cheap ones start at about $50, but I wouldn't go there.
The biggest problem with a players mic input is that you cannot turn the mics up louder than the music. Getting enough mic will be a problem if play your music softly, or if you have a cheap or long mic cord.
You need a mixer to give you tone control on the vocals.
The first thing that you will notice when using the average mixer is that you won't have any "echo", (true echo is a bummer, what you really want is reverb). An effects, (efx), mixer will give you this.
Musiciansfriend has a very nice Alesis 6 channel efx mixer for $150.
Go to
www.musiciansfriend.com and search for product #630157.
This mixer has a 3 band, (HI, Mid, Low), parametric EQ for each channel and a LED level set indicator.
The level set indicator will allow you to set the mic and music level to match one another without needing to listen to the mix.
The mixer works like this:
1. Turn up the music on the mixer to where it should be according to the mixer's LEDs.
2. Adjust the mics the same way.
3. Turn the mixer's main output up 1/2 way.
4. Turn the amp up to the point where the sound is about as loud as you will ever use it. If this is more than 3/4 of the amp's max volume, turn the amp down and turn up the mixers main output instead.
Running the amp at 2/3 of its max volume is ideal.
Ya gotta mic?