JBL 4628B Professional speakers , how can I test them?

DabutcherDabutcher Posts: 2,214
Just pick up a clean pair for fun and profit . Can I just hook a guitar jack into receiver headphones out and plug into one speaker to test them? I only know one person in a band and he has not gotten back to me yet? Thanks. D
MIT Magnum MH-750, Monster HTS 5100MKII, Mitsubishi rear projection 73, PS4, PSW505 , Sunfire Signature Grand 425 x 4,Parasound hca 120, RTi12, FXiA6, CSiA6, SDA SRS 1.2, Pioneer Elite SC63 , Pioneer Elite BDP-05



“Why did you get married if you wanted big speakers?”

Comments

  • kharp1kharp1 Posts: 3,463
    You probably wouldn't want to do that, but, you can get RCA to 1/4 inch cables.
  • mhardy6647mhardy6647 Posts: 24,895
    edited October 2019
    It's a passive speaker, not a powered one, right?

    And it accepts a two-conductor "TS" (tip/sleeve) type phone plug, right?

    qovbcnrk8cyc.png

    If so, you should just need to solder a 1/4 inch two conductor phone plug onto the "plus" ( via the plug's 'tip' -- the center connector) and and "minus" (via the plug's 'sleeve' -- the outer conductor) wires of a speaker cable.
    Or use a coupla clip leads.
    Or buy one.
    I always keep a few in stock :)

  • mhardy6647mhardy6647 Posts: 24,895
    edited October 2019
    Not to go all Cliff Clavin on you :# , but a standard stereo headphone plug is a three conductor connector -- so-called "TRS" (tip-ring-sleeve) -- to accommodate two 'hot' signals (two channels) and a common (ground).

    6q1bxinctj4r.png

    The TRS 1/4 inch phone plug can also be used for balanced line-level connections ("+" and "-" hot signals and a ground)... not really used for speakers per se.

  • mhardy6647mhardy6647 Posts: 24,895
    edited October 2019
    Actually, a guitar cable ought to work, as long as it is two conductor. Hard to say which channel you'll get, but it doesn't really matter.

    Also, on the bright side, the JBLs oughta be sensitive enough to play fairly well even driven from a headphone jack :)

    EDIT: mmm... those look like tonnes of fun.

    cjbkcuc3vb7s.png
    (borrowed image from teh webz)

    Don't flip 'em -- hook 'em to a nice single-ended 2A3 or 300B vacuum tube amplifier and...well... it oughta be pretty nice.

    B)


  • DabutcherDabutcher Posts: 2,214
    Could I just hook speaker wires up to two terminals with holes in them on your picture? These are the non powered ones as in your picture. https://us.v-cdn.net/5021930/uploads/editor/0x/6q1bxinctj4r.pngm6ik99vwcig4.png
    MIT Magnum MH-750, Monster HTS 5100MKII, Mitsubishi rear projection 73, PS4, PSW505 , Sunfire Signature Grand 425 x 4,Parasound hca 120, RTi12, FXiA6, CSiA6, SDA SRS 1.2, Pioneer Elite SC63 , Pioneer Elite BDP-05



    “Why did you get married if you wanted big speakers?”
  • mhardy6647mhardy6647 Posts: 24,895
    it depends on where the contact point is on the phone jack on the speaker.
    It will probably work, actually.
    I'd offer to beta-test it here (with clipleads!) but I don't really have time this morning due to other obligations, unfortunately.

    Clipleads are wonderful things!
    Everyone should have a bag full!
  • mhardy6647mhardy6647 Posts: 24,895
    Didja give 'em a listen yet? :)
    Inquiring minds want to know.
  • DabutcherDabutcher Posts: 2,214
    Worked 13 hours yesterday. Have not even unloaded from my Tundra yet. Hopefully I can figure out how to remove grills easily?
    After inspecting, I will work on figuring out how to hook up correctly without damaging. Thanks. D
    MIT Magnum MH-750, Monster HTS 5100MKII, Mitsubishi rear projection 73, PS4, PSW505 , Sunfire Signature Grand 425 x 4,Parasound hca 120, RTi12, FXiA6, CSiA6, SDA SRS 1.2, Pioneer Elite SC63 , Pioneer Elite BDP-05



    “Why did you get married if you wanted big speakers?”
  • erniejadeerniejade Posts: 5,280
    MONO 1\4" to bare wire. . you can put a banana or spade or just use bare wire for now to test.
    Den: Lumin D1,Wireworld Silver Eclipse RCA, KEF LS50 Wireless, Velodyne SPL1200, Technics 1200, Denon DL160, Jolida D9,

    Living Room:,T+A PA 1530R, Tyler Highland H2, High Fidelity Reveal RCA, PS Audio Direct Stream JR. Wireworld Silver Eclipse SC

    Have but haven't used in a while: LH Labs VI Dac, Cayin SCD50T, Aries Mini, Grant Fidelity Tube Dac 11, W4S recovery, Massdrop Airist Audio R-2R dac

  • erniejadeerniejade Posts: 5,280
    Den: Lumin D1,Wireworld Silver Eclipse RCA, KEF LS50 Wireless, Velodyne SPL1200, Technics 1200, Denon DL160, Jolida D9,

    Living Room:,T+A PA 1530R, Tyler Highland H2, High Fidelity Reveal RCA, PS Audio Direct Stream JR. Wireworld Silver Eclipse SC

    Have but haven't used in a while: LH Labs VI Dac, Cayin SCD50T, Aries Mini, Grant Fidelity Tube Dac 11, W4S recovery, Massdrop Airist Audio R-2R dac

  • DabutcherDabutcher Posts: 2,214
    Thanks just ordered two from amazon same price. I get them Sunday. Peace. D
    MIT Magnum MH-750, Monster HTS 5100MKII, Mitsubishi rear projection 73, PS4, PSW505 , Sunfire Signature Grand 425 x 4,Parasound hca 120, RTi12, FXiA6, CSiA6, SDA SRS 1.2, Pioneer Elite SC63 , Pioneer Elite BDP-05



    “Why did you get married if you wanted big speakers?”
  • DabutcherDabutcher Posts: 2,214
    Thanks for all the help. Pulled grills off. They look perfect behind the screens. Outer cabinets need some black or color choice paint redu. Anyone know where to buy black paint? Heavy suckers. I would guess 80-100 pounds each. 2a8ex95axmkn.jpeg
    Peace. D
    MIT Magnum MH-750, Monster HTS 5100MKII, Mitsubishi rear projection 73, PS4, PSW505 , Sunfire Signature Grand 425 x 4,Parasound hca 120, RTi12, FXiA6, CSiA6, SDA SRS 1.2, Pioneer Elite SC63 , Pioneer Elite BDP-05



    “Why did you get married if you wanted big speakers?”
  • mhardy6647mhardy6647 Posts: 24,895
    If it were anything but black paint...

  • DabutcherDabutcher Posts: 2,214
    Finally getting around to testing these bad boys. Which of the three connectors do I hook up to? Thanks. Donyxe8eoy42i.jpeg
    MIT Magnum MH-750, Monster HTS 5100MKII, Mitsubishi rear projection 73, PS4, PSW505 , Sunfire Signature Grand 425 x 4,Parasound hca 120, RTi12, FXiA6, CSiA6, SDA SRS 1.2, Pioneer Elite SC63 , Pioneer Elite BDP-05



    “Why did you get married if you wanted big speakers?”
  • mhardy6647mhardy6647 Posts: 24,895
    edited October 2019
    hmmm -- it looks like (???) there's no full range input (?!).

    Is there something under that piece of blue painter's tape? :p

    If there is, I'd use that, otherwise, I'd try pluggin' in to that (apparently) "8 ohm low frequency input" and see if you only 'excite' the woofas (which is presumably what'll happen).

    Seems like they 'want to be' biamplified... which is certainly an option to try 'em out! :)

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