#1
Ok I am interested in a guitar online but it had a cracked top the owner said it has been repaired but my question is how will that effect the sound? it has a gloss finish and am not sure if the crack went all of the way through. Thanks for your help!!
#2
Chances are, if the top cracked, it went all the way through - they usually do. The reason a top cracks is usually do to a lack of humidity. The humidity drops in the Winter, then rises in the Spring and Summer. After a couple of these cycles, the top splits.

If the repair job was professionally done, you won't be able to hear the difference. If you decide to buy it, invest in a small room humidifier and keep the relative humidity somewhere between 40% and 50%. Unless you live in a place where the humidity is good all year round.
#3
My guitar has a crack in the top (from playing very percussive music), and I really can't hear the difference. The soundboard of a guitar is usually pretty thin, and under a lot of tension which is how the sound is produced, but I honestly can't see it affecting the tone that much, if its a small crack, and the top still vibrates as one.
#4
I think most cracks on the top of guitars don't effect the sound. If it's cheap and the cracks not bad, I would definitely consider the guitar. I had some issues with humidity earlier, but I put my guitar in it's case with a couple sponges and it "healed". I don't think you would need a humidifier if you use a case and use the "sponge method".
#5
I'd never buy a guitar that had a crack in the soundboard. The back or sides ... well, maybe if it was a vintage instrument I really wanted, but not otherwise.

It would have to be a really, really, really good deal for me to even consider something like that.
Sincerely, Chad.
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