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New addition to my family! Metro Amps JTM45 / Scumback Cab

Discussion in 'Amps and Cabs' started by CALI68, Feb 16, 2009.

  1. CALI68

    CALI68 Member

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    Just wanted to share my excitment with some fellow gear heads! :)

    Metro Amps JTM 45 kit hand built by local amp guru, Val King. South Bay Amp Works 2x12 speaker cab (M75 / H75) wired for 16 ohms. Suffice to say...this combo smokes!

    [​IMG]

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    -Chris
     
  2. Drifting

    Drifting Member

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    Smokin' amp! That's next on my list!

    I would love me some JTM45.
     
  3. amp boy

    amp boy Member

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    jtm45...
    what do you think on the m75/h75 while open, and closed.....??
    any thought on m75/m75 ??

    I've been trying to get my scumback thoughts in order....to make an order down the road.

    i know the info on the site, just trying to hear some perspective from someone with a rig along the lines of my thinking as well.
     
  4. zerorez

    zerorez Supporting Member

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    Chris welcome to the JTM45 club!:D

    Looking forward to one of your great video demos!

    Owner of:
    Rockytop JTM45/50 Bluesbreaker 2 x 12 combo w/powerscaling and Greenbacks
     
  5. big mike

    big mike Moderator - EL34 Emeritas Staff Member

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    SWEET!!! I been threatening to build one of those, but Val's work is top notch!
    Love to hear it.

    As for the m75/H75...well, I got that covered. :D
     
  6. FREELESSONSNOW

    FREELESSONSNOW Senior Member

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    That looks fantastic. I would love to hear clips if you get a chance.
     
  7. Scumback Speakers

    Scumback Speakers Gold Supporting Member

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    Thanks for the kind words, sir! I'm glad to hear the speaker selection & the cabinet passed the audition. :D
     
  8. CALI68

    CALI68 Member

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    Thanks Guys! I'm really stoked! This combo is a dream.

    The Scubacks need at least a 25 hour break in period. BIG MIKE would be the Guy to ask about how they sound after that. As of now the tone is just pure vintage CRUNCH! Think AC/DC "You Shook Me All Night Long". With the flap closed the bass is definitely more pronounced and the overall tone is "tighter". With the flap cracked a bit you start to get that "open" sound. With the flap wide open the tone also sounds wide open. I'm pretty sure this is how I like it best so far.

    Also, one major plus for a pedal whore like me is that it takes pedals VERY well! I'm really diggin' messing around with my pedal collection and this amp. Loads of fun! I'll get a few new clips out soon ...after I have time to really get to know the amp. :)


    -Chris
     
    Last edited: Feb 17, 2009
  9. CALI68

    CALI68 Member

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    No man, thank you! The construction of the cab is superb, the attention to detail is among the best I have ever seen and of those speakers!!! Those friggin' kick ass speakers!!! Thanks for making those :) :)


    ...and let's not skirt the issue...the cab looks KILLER too! :) You did a fantastic job.

    -Chris
     
  10. big mike

    big mike Moderator - EL34 Emeritas Staff Member

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    Who me?
    I wanna hear that thing dude. We gotta hook up sometime.

    ONly problem with that rig....it's not red and sitting in my livingroom.
     
  11. Scumback Speakers

    Scumback Speakers Gold Supporting Member

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    :horse:horse:horse

    So now you need a 2x12 in RED? :jo
     
  12. big mike

    big mike Moderator - EL34 Emeritas Staff Member

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    Probably not...but they seem to multiply around here...
     
  13. CALI68

    CALI68 Member

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    Ha!! LOL

    -Chris
     
  14. lukeII

    lukeII Supporting Member

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    Is their any difference in tone is between a cab which opens at the top of the back (like the Southbay) as opposed to a cab where the opening is in the middle of the cab's back panel? does it change frequence response?
     
  15. Scumback Speakers

    Scumback Speakers Gold Supporting Member

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    You get into a whole pile of testing with a question like that, mister!

    Luckily I've got a combo 2x12 amp this same size as the 2x12 adjustable back cab, so I have some answers (maybe not all) for you.

    First, using an H55/H75 mix in both cabs the combo will have the same basic frequency response as the adjustable cab when it's wide open, although the sound will swirl out the sides of the combo cab and in the other cab it flows up over the amp head on the top of the cab.

    As soon as you start closing the adjustable back panel you start to increase the bass response and projection out the front of the cab, and less sound comes out over the top. Not a huge decrease but you can tell.

    As you close the adjustable panel more, this effect of it being more like a closed back cab is enhanced. I have found that I like the cab set about 2-3 inches open, depending on speakers used, to maximize the benefits of the opening in back to give the tone a more "airy" feel, while increasing the bass response to that of a closed back 2x12.

    This is all subjective, of course, and will really be determined by your ears, rig, speakers and amp setup.

    The design of the cab was to allow players the luxury of having a completely open cab, partially open (tuned bass response if you follow) and completely closed if desired.

    I hope this helped you a bit, although getting into specific frequency ranges is tough due to the many factors involved.
     
  16. newking70

    newking70 Member

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  17. lukeII

    lukeII Supporting Member

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    That Southbay cab sounds very interesting kind of like the only cab I know of where you can tailor the tone to be halfway between an open and closed back cab.
     
  18. Scumback Speakers

    Scumback Speakers Gold Supporting Member

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    That's why I designed it this way, sir. More options, and you can tune it to your tone needs.
     
  19. TeamJA

    TeamJA Member

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    Chris

    Where did you get the rubber feet/isolation feet that sit between the head and cab?

    Oh yah, looks great!

    Jeff
     
  20. CALI68

    CALI68 Member

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    WOW! Good eye! Home Depot....$2.50 :)


    -Chris
     

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