What does a pre out do?


Okay guys. I need to know what a pre out on an integrated amp is used for. I was told that you can use this for hooking up a sub. Is this true? What other functions does a pre out serve? Thanks in advance for all of your help with this.
ev314
You can isolate your the preamp in the integrated and send the signal to another power amp - or powered sub. Basically, you're using your intgrated as your preamp in this configuration.
Thank you Tnkujry!
If you hook up a sub, does it take power awawy from the integrated to the speakers? Or if you isolate the preamp and use another power amp, what happens to the power that the integrated is using? Does it cut off the power?
Thanks for your help!
The pre out on most integrated amps allows you to send a signal to a different amp than the one built into the integrated amp. This allows some folks to upgrade the quality of their amp but retain the preamp portion of the integrated. However this is not often the same as having a second output to drive a second amp with the first amp still ingaged. Integrateds differ so it would be best if you ID'd your integrated so someone with specific knowledge of it could comment, or you could review your manual. If you don't have one you might find one on the manufacturer's web site.
Thank you Newbee.I appreciate your help!
There are different kinds of pre outs:
One you use with jumper to the poweramp input(of the integrated amp) disconnects the poweramp section.
and another kind that will not disconnect the poweramp section and could be used together with different matching poweramp to biamp your speakers(again if such have two sets of binding posts each).
Thank you Marakanetz. Then would it be okay if you purchased an integrated amp with dual binding posts but the speakers are not bi-wire? Is this detremental or would it be okay. Thanks!
" Then would it be okay if you purchased an integrated amp with dual binding posts but the speakers are not bi-wire? Is this detremental or would it be okay "

It would be fine Ev314.