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

Dabutcher
Dabutcher Posts: 2,596
in Speakers
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, Sony 77" Class - A80CJ Series - 4K UHD OLED,PS4, Def Tech 15” sub,LSIM 706c, Sunfire Signature Grand 425 x 4,Parasound hca 120, LSiM 702 x 4, Oppo 103D, SDA SRS 1.2, Pioneer Elite SC63 , Pioneer Elite BDP-05 “Why did you get married if you wanted big speakers?”
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  • kharp1
    kharp1 Posts: 3,453
    You probably wouldn't want to do that, but, you can get RCA to 1/4 inch cables.
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  • mhardy6647
    mhardy6647 Posts: 33,905
    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 :)

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  • mhardy6647
    mhardy6647 Posts: 33,905
    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.

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  • mhardy6647
    mhardy6647 Posts: 33,905
    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)


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  • Dabutcher
    Dabutcher Posts: 2,596
    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, Sony 77" Class - A80CJ Series - 4K UHD OLED,PS4, Def Tech 15” sub,LSIM 706c, Sunfire Signature Grand 425 x 4,Parasound hca 120, LSiM 702 x 4, Oppo 103D, SDA SRS 1.2, Pioneer Elite SC63 , Pioneer Elite BDP-05 “Why did you get married if you wanted big speakers?”
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  • mhardy6647
    mhardy6647 Posts: 33,905
    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!
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  • mhardy6647
    mhardy6647 Posts: 33,905
    Didja give 'em a listen yet? :)
    Inquiring minds want to know.
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  • Dabutcher
    Dabutcher Posts: 2,596
    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, Sony 77" Class - A80CJ Series - 4K UHD OLED,PS4, Def Tech 15” sub,LSIM 706c, Sunfire Signature Grand 425 x 4,Parasound hca 120, LSiM 702 x 4, Oppo 103D, SDA SRS 1.2, Pioneer Elite SC63 , Pioneer Elite BDP-05 “Why did you get married if you wanted big speakers?”
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  • erniejade
    erniejade Posts: 6,321
    MONO 1\4" to bare wire. . you can put a banana or spade or just use bare wire for now to test.
    Klipsch The Nines, Audioquest Thunderbird Interconnect, Innuos Zen MK3 W4S recovery, Revolution Audio Labs USB & Ethernet, Border Patrol SE-I, Audioquest Niagara 5000 & Thunder, Cullen Crossover II PC's.
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  • erniejade
    erniejade Posts: 6,321
    Like this one. Or make your own


    https://www.newegg.com/p/19S-01S0-00052?item=9SIAGNP8A10883&source=googleshopping&nm_mc=knc-googlemkp-mobile&cm_mmc=knc-googlemkp-mobile-_-pla-audiosavings-_-cables+-+speaker+wires-_-9SIAGNP8A10883&gclsrc=aw.ds&&gclid=Cj0KCQjwuNbsBRC-ARIsAAzITudzlDNLpl_FhX5JSD0sSMGXaQX5mEYlMQtjBByJ_3BW6dy9TDwAdUAaAnOCEALw_wcB
    Klipsch The Nines, Audioquest Thunderbird Interconnect, Innuos Zen MK3 W4S recovery, Revolution Audio Labs USB & Ethernet, Border Patrol SE-I, Audioquest Niagara 5000 & Thunder, Cullen Crossover II PC's.
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  • Dabutcher
    Dabutcher Posts: 2,596
    Thanks just ordered two from amazon same price. I get them Sunday. Peace. D
    MIT Magnum MH-750, Monster HTS 5100MKII, Sony 77" Class - A80CJ Series - 4K UHD OLED,PS4, Def Tech 15” sub,LSIM 706c, Sunfire Signature Grand 425 x 4,Parasound hca 120, LSiM 702 x 4, Oppo 103D, SDA SRS 1.2, Pioneer Elite SC63 , Pioneer Elite BDP-05 “Why did you get married if you wanted big speakers?”
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  • Dabutcher
    Dabutcher Posts: 2,596
    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, Sony 77" Class - A80CJ Series - 4K UHD OLED,PS4, Def Tech 15” sub,LSIM 706c, Sunfire Signature Grand 425 x 4,Parasound hca 120, LSiM 702 x 4, Oppo 103D, SDA SRS 1.2, Pioneer Elite SC63 , Pioneer Elite BDP-05 “Why did you get married if you wanted big speakers?”
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  • mhardy6647
    mhardy6647 Posts: 33,905
    If it were anything but black paint...

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  • Dabutcher
    Dabutcher Posts: 2,596
    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, Sony 77" Class - A80CJ Series - 4K UHD OLED,PS4, Def Tech 15” sub,LSIM 706c, Sunfire Signature Grand 425 x 4,Parasound hca 120, LSiM 702 x 4, Oppo 103D, SDA SRS 1.2, Pioneer Elite SC63 , Pioneer Elite BDP-05 “Why did you get married if you wanted big speakers?”
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  • mhardy6647
    mhardy6647 Posts: 33,905
    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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