Considering a mono setup and I have questions...

Discussion in 'McIntosh Audio' started by Flatwounds, Sep 11, 2017.

  1. Flatwounds

    Flatwounds AK Subscriber Subscriber

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    Greetings all!

    I have been happily enjoying my mc225 and 2100 biamp system but low and behold, an mc30/c8 combo popped up locally. I am considering it.

    Here are my questions;
    Can I connect stereo components (stereo reel to reel) to the preamp via y cable - Stereo male rca to male mono? How would the stereo channels play through the mono preamp and amp? Would they be summed,or one side only? I have never done this so I don't know.
    My plan would be to get a mono turntable and enjoy mono records but I do have some stereo components that I would like to connect and be able to use with a mono setup. Pardon my ignorance.

    Also, could I wire two speakers in parallel? + to + - to - ? Would this be better at the amp or from speaker to speaker? The speakers are 8 ohm and identical to each other They are old (1964) Jensen.

    I appreciate any advice you may have.

    Thanks!
     
  2. 62caddy

    62caddy Trust but verify Subscriber

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    Outputs from the tape machine could be ruined if summed in that manner. The speakers can be run in parallel at the 4 ohm tap of the MC30, no problem there.

    Chances are the equipment is going to need work to bring it all up to snuff - possibly up to $1,000 for both units is not out of the question.
     
  3. kevzep

    kevzep Its all about the Music Subscriber

    You need to properly sum the outputs, you can do this with a couple of resistors, google passive output summing.
    When you sum outputs you can cause damage, and the way the two outputs interact with each other can produce some rather odd results.
    Also summing increases levels, which what the resistors are for as well as separating the two outputs electrically.
     
  4. Flatwounds

    Flatwounds AK Subscriber Subscriber

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    Thank you. I've got to put my thinking cap on.
     
  5. Flatwounds

    Flatwounds AK Subscriber Subscriber

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    So, it is possible. It just has to be done correctly, electrically to avoid damage. Am I understanding you correctly? Thanks for your advice.
     
  6. Flatwounds

    Flatwounds AK Subscriber Subscriber

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    Basically, I'm trying to decide if I can run in mono, if the price is right on these pieces, and then eventually get another mc30 and run in stereo. Kind of a long term project. Thanks everyone for your advice.
     
  7. 62caddy

    62caddy Trust but verify Subscriber

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    Could always add the C8S to the C8 and an MC30 for a true late '50s stereo system. McIntosh made the C8S to help facilitate the transition to stereo without having to replace the C8 outright. Of course service/repair costs will be deeper still.

    Personally I think a C11 would be the better way to go which will not be much more after all's said and done - and will have better desirability than a pair of C8s.
     
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  8. mhardy6647

    mhardy6647 AK Subscriber Subscriber

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    C8 is a dandy piece with the EQ network flexibility needed for pre-RIAA era record (especially 78s) EQ standardization.
    The MC30 is a pretty decent amplifier, too.

    This was a Klipsch recommendation for a "sum to mono" line-level box to create a center channel for a "three channel" Klipsch speaker array for home hifi. (The OP can ignore the L and R channels, of course). Also not that this particular implementation has a level control to adjust the center channel to mate with the L & R.
    EDIT: I posted the speaker level rather than line level box by mistake, see the RANE box below.

    See also the famous Rane white paper (apparently updated) at:
    http://www.rane.com/note109.html
     
    Last edited: Sep 12, 2017
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  9. Flatwounds

    Flatwounds AK Subscriber Subscriber

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  10. Flatwounds

    Flatwounds AK Subscriber Subscriber

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    Thank you!
     
  11. cduarte

    cduarte AK Subscriber Subscriber

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    I agree with this completely, I think the C11 works wonderfully with the mc30s, especially since I'm now running this setup... forgive the crappy cellphone pic

    [​IMG]
     
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  12. Flatwounds

    Flatwounds AK Subscriber Subscriber

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    Im on the fence. Seller wants a grand which is a good deal.
     
  13. Flatwounds

    Flatwounds AK Subscriber Subscriber

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    Beautiful!
     
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  14. 62caddy

    62caddy Trust but verify Subscriber

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    Fair price if cosmetics are reasonably good but remember an MC30 will be a good $500 to restore, excluding tubes. I can't say for the C8 but I would think similar. If marginal cosmetics, I would probably pass.
     
  15. Flatwounds

    Flatwounds AK Subscriber Subscriber

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    The cosmetics are 9 out of 10. We agreed on a slightly lower price.
     
  16. 62caddy

    62caddy Trust but verify Subscriber

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    Can't go wrong then.

    Welcome to the MC30 club. :beerchug:
     
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  17. TSmith8605

    TSmith8605 Senile Member Subscriber

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    This Klipsch combining circuit is designed to combine "Speaker Outputs of Stereo Receiver or Amplifier" which is completely different than combining the L + R line-level outputs of a tuner or CD player. This circuit it not applicable to the OP's situation.
     
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  18. mnmmt

    mnmmt AK Subscriber Subscriber

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    I believe the MX114 has a "center" or summed output which can be used to run mono.
     
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  19. mhardy6647

    mhardy6647 AK Subscriber Subscriber

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    Oops, I pasted the wrong one; good catch.
    I'll just refer him to the Rane doc, then.
     
  20. cduarte

    cduarte AK Subscriber Subscriber

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    thanks, the mc30s aren't perfect, they were however completely rebuilt right before I bought them with my choice of coupling caps. They're more than presentable enough.
     
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