>

Lead15 Micro stack speaker outs...

Discussion in 'Marshall Amps' started by rj ryno, Jul 29, 2021.

  1. rj ryno

    rj ryno New Member

    Joined:
    Jul 29, 2021
    Messages:
    8
    Likes Received:
    11
    Hi all!

    new marshall owner here and new to the forum. I recently got a couple mini stacks, the Lead 15 and MG15MSII. The stock 10's are actually pretty darn good...for many years I always thought they were 8's in these. I recently swapped in a 12" celestion (8ohms) and both the outputs on the head say 16ohms, and no lower than 8 to be used. So my question is... can I use the stock 16 ohm 10 inch cab and the modded 8ohm 12 inch cab together on the head? Thought I would ask here before trying it....I already plugged in the modded 12" alone and works fine.
     

    Attached Files:

  2. Matthews Guitars

    Matthews Guitars Well-Known Member

    Joined:
    Aug 17, 2019
    Messages:
    4,605
    Likes Received:
    6,888
    Solid State amps like those should be pretty tolerant of varying speaker impedances. As long as you're above a total speaker load of 4 ohms (2 8s or larger) you'll be fine.

    Those love G10 Greenbacks. For a 10 inch speaker I would pick G10 Greenbacks or G10 Creambacks. They sound so good, I'm not sure that going to G12 Greenbacks is actually worth the effort to modify the cabinets.
     
    Mitchell Pearrow likes this.
  3. rj ryno

    rj ryno New Member

    Joined:
    Jul 29, 2021
    Messages:
    8
    Likes Received:
    11
    ok thanks, I just plugged both of them in and seems fine. Yeah, I don't think I'll be putting 12's in the other 3 cabs, but greenback 10's sound like a good match. We'll see...
     
    Mitchell Pearrow likes this.
  4. Matthews Guitars

    Matthews Guitars Well-Known Member

    Joined:
    Aug 17, 2019
    Messages:
    4,605
    Likes Received:
    6,888
    Gotta be honest here: 70/80s are pretty poor choices for pretty much ANYTHING. Except they work well in a Fender amp, from my experience.
     
    Mitchell Pearrow and fitz288 like this.
  5. fitz288

    fitz288 Well-Known Yinzer Silver Supporting Member

    Joined:
    Apr 7, 2020
    Messages:
    3,044
    Likes Received:
    7,208
    Location:
    rahndahbaht dah 'Burgh
    I have a Lead 15 and I replaced the stock 16ohm speakers with 8ohm Ten-30's for a while.
    They worked fine, but then I replaced those with 16ohm VT jr.'s - way better.
    As @Matthews Guitars said, as long as the total impedance is at least 4ohm, the amp should be fine.
    I'll also agree that the 12" 70-80 is not exactly an upgrade...
    I could be wrong, but from what I've heard, solid state amps just get louder with lower impedance speakers.

    I also have a MG15CFMS, but I gutted that and put my Code25 and some 10" FRFR speakers in it.

    Oh yeah, :welcome: to the forum.
     
    Last edited: Jul 29, 2021
    rj ryno and Mitchell Pearrow like this.
  6. Mitchell Pearrow

    Mitchell Pearrow Well-Known Member VIP Member

    Joined:
    Jul 2, 2018
    Messages:
    14,963
    Likes Received:
    29,395
    Location:
    Moreno Valley CA
    :cheers:
    :welcome:
    TO THE FORUM
    Marshall rules the nest in my opinion.
    Glad to have you aboard.
    Cheers
    Mitch
     
    rj ryno and fitz288 like this.
  7. Mitchell Pearrow

    Mitchell Pearrow Well-Known Member VIP Member

    Joined:
    Jul 2, 2018
    Messages:
    14,963
    Likes Received:
    29,395
    Location:
    Moreno Valley CA
    And by the way I run my 3210’s (lead 100 mosfet’s at a 4 ohm load)
    They are the big brother’s of the lead 15.
    Congratulations on your Marshall amp my friend.
    Cheers
    Mitch
     
    rj ryno and fitz288 like this.
  8. rj ryno

    rj ryno New Member

    Joined:
    Jul 29, 2021
    Messages:
    8
    Likes Received:
    11
    Yeah kinda figured that...I bought a used Traynor YCV40 a couple months ago and the previous owner had swapped in an eminence cannabis rex. The celestion he gave to me for free, since it was the amps original and has since been a spare until today. Not sure if the eminence is any better though.
     
    Mitchell Pearrow likes this.
  9. mickeydg5

    mickeydg5 Well-Known Member

    Joined:
    Sep 30, 2011
    Messages:
    26,684
    Likes Received:
    13,864
    Location:
    united States of America
    The MG amplifier can handle 4 ohms but the LEAD solid state amplifier can only go to 8 ohms minimum.
     
    Mitchell Pearrow likes this.
  10. Mitchell Pearrow

    Mitchell Pearrow Well-Known Member VIP Member

    Joined:
    Jul 2, 2018
    Messages:
    14,963
    Likes Received:
    29,395
    Location:
    Moreno Valley CA
    Really ?
    I have been running both of mine at 4 ohms since I got them, about 5 years now.
    And so far so good, no problems as of yet.
    Cheers
     
    fitz288 likes this.
  11. SkyMonkey

    SkyMonkey Well-Known Member

    Joined:
    Oct 28, 2018
    Messages:
    3,602
    Likes Received:
    5,007
    Location:
    Location:Location
    I think even the MG15MSII needs a total load of 8 ohms minimum (1 x 8, or 2 x 16).
    One 8 and one 16 would make a load of 5.33 ohms, and uneven power distribution.

    I used this site: https://geoffthegreygeek.com/calculator-speakers-in-parallel/#jumpto

    mg15.jpg

    lead15-2000.jpg
     
    Mitchell Pearrow and fitz288 like this.
  12. fitz288

    fitz288 Well-Known Yinzer Silver Supporting Member

    Joined:
    Apr 7, 2020
    Messages:
    3,044
    Likes Received:
    7,208
    Location:
    rahndahbaht dah 'Burgh
    Mine looks exactly like this.
    upload_2021-7-30_12-9-51.png
    I ran the 2 ~ 8 ohm Ten-30's for a couple of months.
    I never dimed it for hours on end, I have louder amps if I want loud.
    Maybe I just got lucky? :shrug:
    Wouldn't hurt to just use 16ohm speakers though.
     
    Mitchell Pearrow likes this.
  13. mickeydg5

    mickeydg5 Well-Known Member

    Joined:
    Sep 30, 2011
    Messages:
    26,684
    Likes Received:
    13,864
    Location:
    united States of America
    My answer was based on Marshall manuals.

    Any amplifier dimed will portray different characteristics and loading (effects).

    You may take your chances as your prerogative.
     
    SkyMonkey and Mitchell Pearrow like this.
  14. Mitchell Pearrow

    Mitchell Pearrow Well-Known Member VIP Member

    Joined:
    Jul 2, 2018
    Messages:
    14,963
    Likes Received:
    29,395
    Location:
    Moreno Valley CA
    I am not playing to any audience.
    But your advice is well taken.
    So far I have not had to turn my 3210’s over 3 on the dial.
    So I feel safe.
    Cheers
     
    SkyMonkey likes this.
  15. mickeydg5

    mickeydg5 Well-Known Member

    Joined:
    Sep 30, 2011
    Messages:
    26,684
    Likes Received:
    13,864
    Location:
    united States of America
    A mismatch on any amplifier played at the low end of signal strength is never a problem. However when you start maximizing signal/power then things are tested and the weakest link breaks first.

    That follows the law, of electronics.
     
    Mitchell Pearrow and SkyMonkey like this.

Share This Page