RCA VS HIGH LEVEL INPUT

[Aryan]

I am going to install my subwoofer in bridge mode to my amp but i am confused as to what should i use RCA OR HIGH LEVEL INPUTS, currently my 4 channel amplifier is running front and rear speakers on separate front and rear channels but i wish to run the rear speakers direclty off the headunit and run only the front speakers off the amp, the remaining rear channel would be used in bridge mode for subwoofer.
Above

i am currently running a high level input for both front and rear speakers pic attached below but after the above mentioned plan i am confused if i can use the high level input for the subwoofer as well, there is no mention of it in the headunit.
The head unit has 2 rca ports
front & rear/sub so i can definetly make use of it for the sub and connect both front speaker and rear speaker via rca to the amplifier and remove the existing high level imput for amplifier.

But this would require me two buy two new rca which in itself is not an issue but i am more concerned of the engine/whining noise which might come with the RCA.
So can i make use of the rear high level input connections from the stereo for subwoofer is it possible?

Also will RCA sound worse than high level input assuming i buy a decent RCA cable? Is high level input better/louder/clearer than the RCA generally or is the same just is low voltage?

I have attached the photo of the high level input wiring from stereo which goes to the amplifier and wiring diagram of my stereo as well.

Main question is that can i use high level input for subwoofer as well?

Ques 2. Is high level input better than rca in terms of sound quality and loudness?

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[dragon.breath 10+ year member]

RCA is cleaner than high level input. The loudness should technically be the same. ( that is what the gain control on the amplifier is for)

I don’t know about your exact head unit, but many will only allow subwoofer control through the rca output. Also, remember that if you used the rear high level output in subwoofer mode, your rear door speakers would only play bass. Just like the subwoofer.

 

[Doxquzme Premium Member]

/\ Ditto /\

 

[some dude]

Does RCA to amp send digital signal? Like 1 or 0?
Or is it like a sin wave of voltage?

 

[Doxquzme Premium Member]

Does RCA to amp send digital signal? Like 1 or 0?
Or is it like a sin wave of voltage?

RCA's transmit Analog signals from the HU. Only digital Coax (w/RCA type connectors) or Fiber Spdif cable transmit digital signals.

 

[1aespinoza 10+ year member]

The head unit has 2 rca ports
front & rear/sub so i can definetly

Use two sets of RCAs. One set for the Front channels and the other for Sub Output and into Rear Input on the amp. Turn off the Rear Filter on the amp since the signal will already be filtered by the radio.