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Another Twin Reverb speaker thread

Discussion in 'Amp Tech Center' started by swampyankee, Feb 12, 2018.

  1. moosie

    moosie Doctor of Teleocity Silver Supporter

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    But you didn't like them in the Twin because they sounded thin. Supposedly due to impedance mismatch. Yeah, that sounds unlikely, so as was said, check your phasing.

    The other thought about that... perhaps because the Twin is a loud(er) amp, you turned it down more when testing, but didn't roll the bass up. General rule with BF/SF that as the volume goes up, bass goes down, and vice versa.

    Just a thought. That said, I've had speakers that I love in one SF amp, and hate in another. The JBL D120F pair (original cones) sounded flat in my Twin, but one of them in my SF DR sounded amazing.

    You could also try mix-n-match. One G12C, and one of something warmer, like a Celestion Vintage 30.
     
  2. noname_dragon

    noname_dragon Tele-Holic

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    Captain Obvious sez... It's probably been discussed many times, but here's my sure fire way to make sure speakers are in phase. Pull the speaker plug from the back of the amp chassis jack and touch a 9V battery to the plug... tip to positive. You'll easily see both cones jump forward (preferrable) or back (acceptable). If they move opposite ways they are out of phase and will sound thin and strange. Rewire one speaker so both move together... preferrably forward.
     
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  3. moosie

    moosie Doctor of Teleocity Silver Supporter

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    Yep, easy to do, and fool proof.

    I get funny looks when people see the 9V with a bit of wire taped to it, like I'm a bomb maker or something.
     
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  4. alnicopu

    alnicopu Friend of Leo's

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    Man, if Ike Turner was still alive he’d be smackin’ Tina all over the room after seein’ that!!!
     
  5. swampyankee

    swampyankee Tele-Holic

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    Sorry, different speaker. The pair of G12C /G12C/s are 16 ohm each, from my Bandmaster VM cabinet. The G12C I put in the Concert is an 8 ohm speaker (correct for the Concert) I bought for another amp.
    I'm planning to give the pair another try. I've emailed Warehouse to ask about polarity.
     
  6. swampyankee

    swampyankee Tele-Holic

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    Wish I had known that trick when the speakers were still in the Twin. I'll have to try it though, thanx!
     
  7. Dave Harmon

    Dave Harmon TDPRI Member

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    EDIT.....OOOPS.....I see that someone has already posted almost the same thing I said below but I will leave it up for a while just in case....

    An easy way to test the phasing of the speakers regardless of how the terminals are marked is to connect a 9v battery across each speaker...polarity doesn't matter as long as you connect the battery the same way to each speaker.....then note if the cone goes in or out....then wire the speakers correctly.
    Both speakers must go the same direction when wired in phase.

    I use clip leads...lets say the + battery terminal connected to the left terminal on the speaker....then the - battery to the right terminal on the same speaker...see which way the cone goes...then repeat exactly the same on the other speaker.
    When you get done wiring the speakers together...connect the battery again and see if both cones go the same direction.

    OR....connect the battery now and see if they go the same direction ...no need to take them apart if they are already wired up.
    If the cones go opposite directions....reverse the wires on only ONE speaker.
     
  8. swampyankee

    swampyankee Tele-Holic

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    I tried a set of Rolas out of a '76 era Twin (they were cheap). Nice glassy Twin tones, not too peaky in the highs, but not quite the bass or mid response I'm looking for from my Twin Reverb.
    So I went back to the Warehouse speakers and tested the polarity with a 9V. Didn't discover anything different than I expected, so I decided to give them another try.
    It's possible that I had something crossed the first time, because the combo of the G12C and G12C/S is much different than what I heard the first time I hooked them up, in fact they're really nailing the tone I'm looking for. Big, percussive bass. Decent mids. Great glassy highs but a controllable ice pick (sometimes you just want that Tele ice pick!). None of that thin, bass-less sound I attributed to the mismatched ohms (2-16 ohm speakers = 8 ohms with 4 ohm output from the Twin)
    I read recently that in addition to a minimal loss in volume from a mismatched load, it gets a bit more middy, which might be a good thing for a SFTR.
    Eventually, I might move to a set speakers of the proper load and I was thinking of trying a set of RI Jensens or Weber 12F150's, but I'm digging What I'm hearing for now.
     
    Last edited: Feb 20, 2018
  9. Teleguy61

    Teleguy61 Friend of Leo's

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    Or sound better, or be heavier.
    Except for EV SROs.
     
  10. moosie

    moosie Doctor of Teleocity Silver Supporter

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    I bought a '79 Twin that I didn't want, just because it had a pair of pristine JBLs. Flipped the Twin, kept the speakers for ... nearly free.

    The plan was to put them in my '69 Twin, as the perfect icing on the cake. The way I compare is to record in a controlled setting with a Zoom H2N, and once I have all my clips, listen back to back through good headphones.

    The JBLs were not even #2 on the list. Of the speakers I had on hand (can't remember all of them now), the modern Jensen C12Ns won out, but a pretty big margin. One speaker I wanted to test, but didn't have available, was my WGS G12C, as it was in my son's amp at the time. Now that I have that back at the house, I may find time to A/B that (single) against a (single) C12N in the Twin.

    The JBLs? One's on the shelf, waiting for the right amp. One's found it's home in the 77 DR. Sounds killer in there, except now that amp is at my son's house. :rolleyes:


    Here are the JBLs temporarily in the '69.

    Playing JBLs.JPG
     
  11. alnicopu

    alnicopu Friend of Leo's

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    Now youre just bragging with that speaker porn youre showin’.
     
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  12. moosie

    moosie Doctor of Teleocity Silver Supporter

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    Busted :lol:
     
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  13. Beatbx

    Beatbx Tele-Meister

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    I like Jensen C12K’s pretty well. I had one paired with a Jensen Blackbird under my Dual Showman and it sounded sweet, plenty of everything I like. I eventually got a 4x12 instead and bounced those two speakers around some other amps, trying to find a home for them. In the end, I’ve sold the Blackbird and hung onto the C12K.
     
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