pre out?

[Kanifee]

I have been fooling around with my av reciever as a friend gave me a soy surround sound speaker set.
now i have noticed on the back that the sub connections are called "sub woofer pre out" and i have 2 center connections one is a standerd one and the other is a "center pre out" now the standerd center out is a single connection but the pre out for the center is x2 rca sockets.
so my question is what is a pre out and why does the connection double on the center speaker.
many thanks people.

 

[jellybeard999]

If you use the pre-out, it bypasses the receiver's power amp, and allows you to use an external power amp, leaving the processing to the reciever.

99% of subwoofers use the pre-out, as they have internal amplification (active subwoofers).

 

[Kanifee]

i have an active sony sub here.
i plug it up through the pre amp and i get nothing. the sub has coax/audio L and R
and a usb connection and optical out. the only way i can get any signal to the sub is through coax, i cant seem to get any signel out from the pre out on the sub.
any ideas?

 

[mattyfez]

there is some confusion here....
subs dont have outputs generally speaking, they only have inputs, which fall into two catagories:

1. most common and generally best is line level input (which is powered by the "pre-out" on an amplifier)
this takes a low power signal from a cd player or pc etc. which is amplified by the subs internal amp.

2, High level or powered input, this is used when the sub does not have an internal amp, or you do not wish to use the subs internal amp.

The exepetion to this rule, is that some "active subs" (subs with built in amps)
have line level outputs to allow you to link up additional "active" subs without trailing cable back to the cd PC/pre-amp/source





In answer to the origeonal question, a "pre out" or a "line out" is a low power or "un-amplified" audio signal, it needs to be amplified ( by an amplifier ) in order for you to get any sound out of it from a speaker.

the only reason I can think of for your center outputs on your amp to have two RCA pre-outs, is because you might want to use a center speaker with two individual speakers built into it, a stereo center speaker of sorts.

alternatively, high end UBER center speakers may have a seperate woofer and tweeter, hence needing two channel inputs for a more pure sound.

 

[Kanifee]

do you have any idea why my active sub doesn't seem to work when plugged into the pre out on the cinema receiver?
i have enabled the sub on the amp the sub does work because it receives a signel on the coax but because the coax is for a full audio signal?
the sub is recieving all of the stream and not just the freaquancy it should?
if that made sense to you lol!

 

[mattyfez]

Assuming its all set up correctly, the only reason i can think if the RCA cable is faulty, or one of the RCA sockets is faulty.

on the sub controls, if there is a knob saying crossover/low pass or similar you can use this to manually cut out the unwanted higher frequencies from a full range input.

hope thats of some help.

 

[Alibaba99]

there is some confusion here....
subs dont have outputs generally speaking, they only have inputs, which fall into two catagories:

1. most common and generally best is line level input (which is powered by the "pre-out" on an amplifier)
this takes a low power signal from a cd player or pc etc. which is amplified by the subs internal amp.

2, High level or powered input, this is used when the sub does not have an internal amp, or you do not wish to use the subs internal amp.

The exepetion to this rule, is that some "active subs" (subs with built in amps)
have line level outputs to allow you to link up additional "active" subs without trailing cable back to the cd PC/pre-amp/source





In answer to the origeonal question, a "pre out" or a "line out" is a low power or "un-amplified" audio signal, it needs to be amplified ( by an amplifier ) in order for you to get any sound out of it from a speaker.

the only reason I can think of for your center outputs on your amp to have two RCA pre-outs, is because you might want to use a center speaker with two individual speakers built into it, a stereo center speaker of sorts.

alternatively, high end UBER center speakers may have a seperate woofer and tweeter, hence needing two channel inputs for a more pure sound.

Some subs have outputs so they can be used in amp systems that don't have a LF filter on the amp. The full range L&R signals are sent to the sub, which filters out the bit that it needs and then passes the rest of the signal to the main stereo speakers.

 

[Kanifee]

cheers fellas helps a lot ill have to try and get ahold of the philips speakers that are meant to be used with this amp then ill know for sure if there is a problem with it.
will it be a downgrade moving from sony speakers to philips

from these

to theses

that is also the very same amp i have.