two pre-outs required for Yamaha sub?

Discussion in 'Speakers' started by Jamie*M, Dec 30, 2004.

  1. Jamie*M

    Jamie*M Auditioning

    Joined:
    Dec 30, 2004
    Messages:
    3
    Likes Received:
    0
    Hello.

    I recently purchased a powered Yamaha sub (YST-SW015) for my Kenwood VR-309 receiver. The receiver is a few years old, but has all the connections for surround sound, including a pre-out for the sub. However, in the Yamaha manual, it says if the receiver has less than two sets of pre-outs, don't plug it in there. I"m a bit confused by this, can anyone tell me why one pre-out would be a problem?

    Help is appreciated!
     
  2. ScottCHI

    ScottCHI Screenwriter

    Joined:
    Feb 21, 2004
    Messages:
    1,292
    Likes Received:
    0
    the manual says:

    i don't know why it says this exactly. maybe someone else can answer that.

    but it's talking about pairs of PRE-OUTS. and it doesn't apply to you anyway because you're going to use the receiver's mono SUB-OUT, and a single cable to the sub's L/Mono input, right?
     
  3. Jamie*M

    Jamie*M Auditioning

    Joined:
    Dec 30, 2004
    Messages:
    3
    Likes Received:
    0
    well the designated out from the receiver just says "pre out" and yes, I'm going mono to the sub. I'll look again, but I don't think there's anywhere else to plug the sub in.

    edit: whoops you already quoted the manual. sorry.

    i'm new to surround sound, so i apoligize if this is something obvious i'm missing.
     
  4. ScottCHI

    ScottCHI Screenwriter

    Joined:
    Feb 21, 2004
    Messages:
    1,292
    Likes Received:
    0
    no, you're not missing anything. the manual is probably like most. vague and confusing.

    you're going to connect the sub the way that's described at the top left of pg. E-4, not the top right of that page.

    your receiver's single PRE-OUT is also labelled SUBWOOFER, is it not?

    so, provided you plan to use the receiver to manage your bass (and i assume you do), you just need to connect a single rca cable from the receiver's SUBWOOFER PRE-OUT to the subwoofer's L/MONO INPUT, as pictured in the manual. the subwoofer pre-out is labelled "SUBWOOFER (LOW PASS)" in the manual's diagram, btw.
     
  5. Jamie*M

    Jamie*M Auditioning

    Joined:
    Dec 30, 2004
    Messages:
    3
    Likes Received:
    0
    I'll have to double check the receiver when I get home, not sure if it's labelled subwoofer or not. The diagram in the Kenwood online manual says it is, so that's something.

    Thanks for your help on this, the vague wording really threw me.
     
  6. John Garcia

    John Garcia Executive Producer

    Joined:
    Jun 24, 1999
    Messages:
    11,571
    Likes Received:
    24
    Location:
    NorCal
    Real Name:
    John
    Use a Y splitter. Some subs need a certain amount of input voltate to remain on during times when there is not a lot of bass activity.
     
  7. ScottCHI

    ScottCHI Screenwriter

    Joined:
    Feb 21, 2004
    Messages:
    1,292
    Likes Received:
    0
    [​IMG]

    please. that is NOT AT ALL what he is asking about.

    i took the time to read his entire post and download both the manuals for his receiver and his sub and i know EXACTLY what he is asking about.

    please, let's not confuse things for him. you gave an answer to a question that he didn't even ask.
     
  8. Wayne A. Pflughaupt

    Joined:
    Aug 5, 1999
    Messages:
    6,040
    Likes Received:
    17
    Location:
    Katy, TX
    Real Name:
    Wayne
    I agree, Scott, but it’s actually not a bad suggestion.

    The Yamaha sub may be the rare one that doesn’t internally sum the inputs – i.e., true stereo, perhaps with a DVC driver. If that's the case, it wouldn’t be a problem feeding it a split mono signal.

    Regards,
    Wayne A. Pflughaupt
     
  9. ScottCHI

    ScottCHI Screenwriter

    Joined:
    Feb 21, 2004
    Messages:
    1,292
    Likes Received:
    0
    rtfm

    [​IMG]

    the sub has L+R inputs with the L one clearly also labelled Mono. the manual clearly shows either a single cable run from a receiver/pre/pro's SUB-OUT to the L/MONO input of the sub or a 2-channel cable run from a receiver/pre/pro's L+R pre-outs to the L+R inputs of the sub.

    BUT, his kenwood labels the SINGLE mono sub-out as subwoofer "PRE-OUT". AND the yamaha manual has the statement that if you have only one set of PRE-OUTs, to NOT connect the sub to them (why, i still don't know?). hence, the confusion.

    the Y-splitter is a whole other question that can be addressed separately if jamie wishes to pursue it. but it has no bearing on what he was initially asking about. if anything, it potentially confuses the question.
     
  10. John Garcia

    John Garcia Executive Producer

    Joined:
    Jun 24, 1999
    Messages:
    11,571
    Likes Received:
    24
    Location:
    NorCal
    Real Name:
    John
    That's pretty much what I was getting at, some subs require the use of both inputs for exactly the reason Wayne mentions, and it is the only reason why I mentioned a Y. I knew what he was talking about because some older Yamaha receivers had stereo sub pre-outs, thus some of their subs were also setup to utilize this functionality.
     
  11. ScottCHI

    ScottCHI Screenwriter

    Joined:
    Feb 21, 2004
    Messages:
    1,292
    Likes Received:
    0
    don't mind me. i'm just crabby.

    [​IMG]
     

Share This Page