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Thread: B-460 subwoofer - need help

  1. #1
    markus_tirol
    Guest

    B-460 subwoofer - need help

    I just purchased an original JBL B-460 subwoofer on ebay - (as an addendum for my 250 ti´s). At least it used to be original at some time ..... . It looks in good working order but it seems not to have a crossover built in . When I hooked it up it sounds like a (bad) wide band speaker - with a wide frequency range. I did not open the cabinet yet - so I do not know if it has or does not have a crossover.

    Does anybody know about the B-460 subwooofer and which crossover it originally had.

    Also I would like to know what is the supposed power rating for the amp to drive it properly.

    I am from Austria - so please excuse my not perfect english...


  2. #2
    Steve Gonzales
    Guest

    WELCOME to our Austrian Friends!

    You need the BX-63 electronic crossover that was the mate for the B460/B380. You are correct in your impression of the B460's sound without this vital piece of gear as it does not contain any crossover internally. You can run any brand of crossover (as long as it is of high quality) if you cannot find the semi- rare BX-63. The BX-63 crosses the B460/B380's at 63hz. It sums the Low Frequency information of the left anf right channels and outputs them to a mono channel and an otherwise identical inverted channel to enable bridging a stereo amplifier. At least 300 CLEAN watts from an amp capable of delivering high current would be the bare minimum I would use, 1kw wouldn't scare me at all, just as long as you set it up properly and again, use a VERY high quality amp. Massive, clean and musical bass is what you will get once you find the JBL BX63 or another quality unit. You will also need to pay attention to placement in the room (as much as you can) and balancing the levels between your mains and the sub. Take your time. A few inches can make a big difference although it usually is more like feet in a typical set-up. You've got something special there. Good luck and don't be afraid to ask plenty of questions of the forum members. We also really like to see pictures. Regards, Steve G

  3. #3
    4313B
    Guest
    Quote Originally Posted by markus_tirol
    Does anybody know about the B-460 subwooofer and which crossover it originally had.
    Yeah, I think we've all owned a few of them at one time or other...

    http://audioheritage.csdco.com/vbull...ead.php?t=4557

    http://www.lansingheritage.org/html/...-b380-b460.htm

  4. #4
    mrbluster
    Guest
    [QUOTE=Steve Gonzales]It sums the Low Frequency information of the left anf right channels and outputs them to a mono channel and an otherwise identical inverted channel to enable bridging a stereo amplifier.......... Since Bridging would cut the dampening factor in half, and the amplifier would see a 4 ohm load (B-460), in (for example) the case of a 200 watt stereo amp, would this necessarily be an improvement over using one channel? Opinions, suggestions?

    Thanks,
    Mrbluster

  5. #5
    Zilch
    Guest
    See the information Giskard posted for you above.

    I run B460 directly from the subwoofer output of my preamplifier through a bridged JBL 6260 amplifier. While I do have a BX63A crossover, which has additional features like adjustable crossover frequency (63-125 Hz), I have never used it, since B380 and B460 sound just fine without it. Room response seems to enhance the bass they deliver more than enough for me.

    I would not bridge any amplifier that is not specifically made for that. Those typically have a switch to provide their own input inversion on one channel, and no external hardware is required.

  6. #6
    Administrator Mr. Widget's Avatar
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    Many folks on this forum seem to like bridging amps. Most of the amps I own have a bridge switch built in and yet I still prefer the sound of 3dB less watts and better damping factor (woofer control). When I need a single channel I just use half the amp... it just sounds better. With most amps if you only use one channel you are taxing the PS less so you also have greater current capacity. Give it a try.

    Widget

  7. #7
    Zilch
    Guest
    Quote Originally Posted by Mr. Widget
    I still prefer the sound of 3dB less watts and better damping factor (woofer control).
    'Course you could easily get the extra 3 dB AND the damping control by simply running TWO B460's in stereo.

    That way, half of the amp isn't sitting idle all the time. We believe in mantaining balance and equilibrium in the universe wherever possible....

  8. #8
    mrbluster
    Guest

    Bingo!

    [QUOTE=Zilch]'Course you could easily get the extra 3 dB AND the damping control by simply running TWO B460's in stereo.

    Now that is an answer with some thinking behind it! I am impressed.
    Don't know where I can find a second B460 right now, but while I am looking, do you think I could use a SUB1500 in a 6 cu.ft. Olympus cabinet as a reasonable substitute? It is the best I can do at the moment.

    Mrbluster

  9. #9
    Zilch
    Guest
    That sounds like a reasonable interim compromise.

    [Play gently with that Olympus, tho. It's not all that well braced for sub use, and Sub1500 will render it kindling if ya crank it....]

  10. #10
    4313B
    Guest
    Don't know where I can find a second B460 right now, but while I am looking, do you think I could use a SUB1500 in a 6 cu.ft. Olympus cabinet as a reasonable substitute? It is the best I can do at the moment.
    You need ANY B460's with SUB1500's around??? That's bizarre! One of the major points of owning a SUB1500 is to get away from the huge enclosure volume requirements...

  11. #11
    mrbluster
    Guest
    Just daydreaming. You know the old agage, "there's no substitute for CUBIC INCHES"

    Mrbluster

  12. #12
    4313B
    Guest
    Yeah, yeah. I'll take a 327 mouse in a 3,000 pound car over a 427 rat in a 4,000 pound car anyday.

    ... but that 427 sure is fun in a 3,000 pounder!

  13. #13
    Steve Gonzales
    Guest

    Bridging amps

    I just wanted to tell him that JBL included that feature and choice. I guess if you are worried about dampening factor, your choice of amp would have to revolve around that and low impedence drive capabilities. I have run my m80's bridged and had no problems in real world conditions. I didn't notice a lack of control, just more power. It guess it must depend on what you are using.

  14. #14
    Senior Member
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    I have a Harman Kardon Citation 16 that I want to try with my B460. I know how to bridge it with the internal jumpers,but what input do I use and which speaker outputs would I use as well???
    Attached Images Attached Images  

  15. #15
    Administrator Robh3606's Avatar
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    "I know how to bridge it with the internal jumpers,but what input do I use and which speaker outputs would I use as well???"

    The manual doesn't tell you?? Anything under the cover?? or near the jumpers??

    On a Crown it's channel 1 as input channel 2 off and the output is taken off the two + leads. For yours?????


    Rob

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