The sound sounds like it's high frecuency...

The interface is amplifying the internal hiss of the electronics within it. It's the electrical interference from within the unit. It's the hall-mark of a cheap preamp/da/ad unit.

If you don't amp the pre so much this hiss will be your noise floor which can be kept below the audible range.

At least this is what I hear when I pump the gain on my Edirol UA-25.

Unless you want to do some sort of nature recording where you need a boat load of gain, don't stress too much.

Check that you haven't got the 20dB pad engaged (gain knob pulled out).

The 610 doesn't have a lot of gain, but should be enough for close-miked vocals or instruments using your SM57.

Use a pop filter if you are using a 57 for vocals.

Hiss? I got over that a long time ago.

I can still hear it, but it doesn't haunt me.
I laugh in it's face, smile at the musicianship and shout from the hilltops, "SCREW YOU, 16KHZ!"

Buzzing is a little more annoying but I'm getting there.
I have a recording of a ceilidh band playing Highland Cathedral, and I could care less about some interference and buzzing, because the performance was fantastic.

I believe in a scale of quality - at one extreme, you have performances so good, you can still love them in spite of poor quality, terrible acoustics, interference, etc.
At the other extreme, songs so awful you wouldn't listen to them even if they were mastered to precision and played over quality speakers and whatnot.

Ufortunately, Greener is spot on here. Not unfortunate that it's Greener who is right. Just unfortunate for you. I can crank the gain on my pres with a 57 without any hiss. You might think about investing in a better preamp or return the 610 and get a better interface. Either way you'll need to spend some money.

Is it possible you are experiencing the dreads firewire whine?

Thanks... I think I will buy a pre amp, when I do buy the pre amp... is there any problem if I plug that line into the audio interface input with the pre amp? Or do I need to plug it into the inputs without preamps? is there any way to bypass those preamps? thanks

Depends on your setup. Typically the line out of the preamp would go directly into your mixer input or, better yet digital converter interface input. If your mixer has pre amps built in with gain knobs and such that should not matter as long as you keep the knobs at infinity. You should have no problem routing the out of your pre amp (assuming we're talking instruments or vocals here) to your mixer directly.

"as long as you keep the knobs at infinity."

That's a lot of gain there.

You mean "unity"?

Rule of thumb: line out to line in always. Iwon't comment on the infinity thing....wait, I just did.

JPstudios wrote: as long as you keep the knobs at infinity.

Is that past 11?