Question about Yamaha RX-V663 Receiver

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Can I use front preouts for subwoofer?

The manual says not to use preouts at the same as speaker connections even though the same signal goes to each. I don't want to run the speaker wires through the sub in case I degrade the signal. Looking to changing my fronts to large by doing this so they are full range (speakers go down to 47Hz and sub to 20Hz). Thanks.

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  • neilcowdy May 09, 2009

    Thanks for your help, some further info as follows. If I can get the sub working on taking the lows out of the front speakers if I set them to large on the receiver then that is one thing less to send to the other sub on the LFE channel. I have run fronts through a sub on another setup and it worked OK but not as good as using the sub preout with rca lead. I was hoping to get a similar voltage signal as sent to the sub on LFE channel. I understand the preouts can be used to go to an external amp, does a sub classify as one? Why I am doing this is I am having trouble calibrating 2 subs on LFE channel and have read that this is one way of side stepping the issue.

  • Samuel Charles Spriggs May 11, 2010

    Wow! There's a lot to write about here.



    I'm not sure I understand your objective, but here goes.



    - "manual says not to use preouts at the same as speaker connections"



    Preouts will only power headphones -- not a hot enough signal to power speakers -- preouts go into AUX inputs -- I think this is the appropriate clarification.



    - "even though the same signal goes to each"



    It's the same signal in a sense, but preouts are millivolts, speaker outs are 35 volts -- in that range



    - "I don't want to run the speaker wires through the sub in case I degrade the signal"



    Running speaker wires through a subwoofer will probably burn out the amp -- if I understand what you are writing



    - "Looking to changing my fronts to large"



    Does this mean replacing your front speakers with full range, high wattage speakers?



    I get lost after that. Maybe you could clarify.









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First, you have to have a self-powered subwoofer (or two) with this reciver. That means the sub has its own amplifier. These are usually capable of accepting either Line Level (RCA) input or direct L and R amplifier channel speaker wires from your receiver from which it will react only to frequencies in its range. It doesn't actually use any if the power from your receiver's amp.

That is why you can extend your front speakers from the sub. Again, understand this - it is not playing any part in amplifying them. The amps in your receiver are just passing through it.

Setting your speaker 'Type' definition to Large will tell your receiver that they are capable of real bass (as opposed to small satellites) but won't necessarily steal anything from the subs. Set your LFE/Bass Out setting to Both if your front speakers are capable of handling real bass. Why would you want to deny them bass if they can handle it?

This part is confusing "If I can get the sub working on taking the lows out of the front speakers if I set them to large on the receiver then that is one thing less to send to the other sub on the LFE channel". The crossover feature allows you to define what bass goes to the sub. You would use the various points to smooth out the transition between your sub and the rest. Your quote of 47hz spec for something doesn't suggest your other speakers are great bass reproducers. One needs to see the +- db spec with less than x% distortion for that number make any sense.

Your receiver has two RCA Subwoofer Outputs but I'm sure they get the exact same level. If you're having trouble matching two different subs doesn't at least one of them have an adjustment for volume? Or maybe you could use physical positioning to adjust their comparative volume.

Posted on May 20, 2009

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Try it. It won't hurt anything. You could also use a tape deck output too.

Posted on May 08, 2009

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