DI Box Enquiry

[anonymous2294]

Hi Peeps, I am a polytechnic student new to the area of sound engineering and I have some questions about DI boxes. Sometimes I tap sound from an audio mixer and there is a buzz in it. I was told DI boxes could reduce the sound. However, there are the battery operated ones and passive ones. Hence, here are my questions:

1) What is the difference between battery operated ones and passive ones?

2) I was told passive ones may not work well with long distance cables (150m), is that true?

3) I was recommended Radial passive DI boxes. Which are the models with a splitter output (sometimes I need to feed to 2 recording devices)?

Hope you guys can help me with my doubts. Thanks

 

[blueprintstudios]

These should answer your questions.
http://www.radialeng.com/di-jdi-faq.htm
http://www.soundonsound.com/sos/jun02/articles/diboxes.asp

3) I'm using a Radial J48. if you need a "Parallel Out" try

http://www.bossus.com/gear/productdetails.php?ProductId=410