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Ampeg amp Q - with pics

Discussion in 'Amps and Cabs [BG]' started by AlstottMVP2, Sep 17, 2008.

  1. AlstottMVP2


    May 9, 2007
    I own the Ampeg B2RE bass amp.


    According to the website, it is:
    450W @ 4 ohms, 250W @ 8 ohms

    I have two speakers I would like to run it to.

    The first is a Hartke 4x10 speaker.


    I think it's rated at 8 ohm, as listed on the back.

    The other amp is the Ampeg 1x15 with wheels:

    No listing of ohms on the back, but it looks like this:


    I have bought two of these, and they broke each time. Maybe i did it, wiring it wrong. The guy at the store told me to just plug it in, no worry about ohmage.

    BUT - the B2Re has TWO speaker outputs, and I ran two cables form it, one to each speaker. Someone told me I SHOULD have wired 1 speaker cable to the hartke, then
    another wire from the hartker, into the Ampeg. Is this true? Does it matter?

    Please help me. I'm getting it back from the shop early next week, and I realllly don't want to plug it back in and destory it (a 3rd time). They said the board needed soldered (it's under warranty).

  2. bongomania

    bongomania Commercial User

    Oct 17, 2005
    PDX, OR
    owner, OVNIFX and OVNILabs
    If the "these" that you broke two of was the B2RE, then what probably happened was the Ampeg 115 is rated 4 ohms, which in combination with the 8 ohm cab makes a 2.67 ohm load. And your amp cannot handle a 2.67 ohm load without burning out.

    Maybe you can swap an 8 ohm cone into that cab. That would bring the combined load to 4 ohms, which your amp can handle.
  3. xshawnxearthx


    Aug 23, 2004
    new jersey
    get rid of the hartke cab and just run the 15.
  4. Jerrold Tiers

    Jerrold Tiers

    Nov 14, 2003
    St Louis
    You can run one 4 ohm speaker, OR two 8 ohm speakers, OR four 16 ohm speakers, etc.

    You can NOT run one 8 ohm AND one 4 ohm, or more than two 8 ohm speakers, etc. That ends up under 4 ohms

    How you hook them up is not that important, one wire to each is fine, and a wire to the first and from that another to the second is usually fine also. A few speakers can be "split" into 2 sub-systems by plugging into extra jacks, in which case follow the directions........

    The manuals used to have a neat little table of what you could use and be OK for any given minimum impedance. You might look for that.

    It had hookup information also........... maybe the Loud folks cut that back? Could be one reason their stock was at $2.86 today, but $15 a couple years ago
  5. AlstottMVP2


    May 9, 2007
    Okay. For a short-term solution - I could just run the 4x10 and keep the 1x15 for a home amp?

    And just so I know - please break this down for me - For my Ampeg amp that says "8 ohms at 450 watts", I should only buy a 15-inch bass cabinet rated at 8 OHMS?

    Forgive my ignorance on this. thanks!
  6. AlstottMVP2


    May 9, 2007

    Will It be all bottom, and no mids/highs?

    Again, I admit these are probably elementary Qs, but I"m pretty new at this.
  7. xshawnxearthx


    Aug 23, 2004
    new jersey
    you will get a ton of low end with that. i used to play with a 15. never had a problem with it. the big difference you will here is how much better you sound when you get rid of the hartke. :bag:
  8. tlwaps


    Feb 13, 2006
    I have to agree, get rid of the hartke cab. I'd suggest getting rid of the 4x10 and picking up a 2x10, run the 2x10 with the 1x15. But the most important thing is getting rid of the hartke IMO.
  9. Is it just me, or does the graphic EQ contradict the parametric EQ?

    The Graphic EQ boosts mids, while the knobs cuts mids.

    Just wanted to throw it out there. :D
  10. bongomania

    bongomania Commercial User

    Oct 17, 2005
    PDX, OR
    owner, OVNIFX and OVNILabs
    You can run either one by itself. You can run the Hartke with another 8 ohm cab. You cannot run the 115 with any other cab. You don't need to use an 8 ohm cab with that amp, but whatever cab (or cab combination) you use has to be at least 4 ohms total load. Read the ohms FAQ.
  11. AlstottMVP2


    May 9, 2007
    thanks - this is VERY helpful.

    I remember that I blew up the first one when I was using it with the 8 ohm hartke, and another piece of junk 2x15 backline speaker.

    I blew up the second one using (what must be a) 4 ohm 1x15 ampeg and an 8 ohm 4x15 hartke.

    I think that makes sense to me. (kicking myself, but both were covered).

    I will just use the 1x15 ampeg for now with it. Heck, it has wheels :)

    The next question is this---- how can I be SURE the 1x15 Ampeg is only rated 4 ohms, and can anyone recommend a 2x10 ampeg speaker cab that will look good with it, and fit the ohms? thanks!!!!!!
  12. gerryjazzman

    gerryjazzman Supporting Member

    Dec 31, 2006
    New Jersey
    Do you have access to an ohm meter / DVM? If not, you can get decent ones for under $20, some under $10. Always good to have around for testing. Plug a cable into the back of the cabinet and hook the ohm meter to the other side. A 4 ohm cabinet will likely have a resistance somewhere between 2.5 and 3.5 ohms. If it's an 8 ohm cabinet the resistance will probably be between 5 and 7 ohms. These are just general guidelines, but you should be able to tell the difference between a 4 and 8 ohm cabinet this way.
  13. ChrisPbass


    Jul 18, 2006
    Fairfax, VA
    You could always look at the speaker. The impedance will be on there. Most likely you would have to take the speaker out as it is probably on the back of the speaker. not a lot of fun but you'll know.
  14. AlstottMVP2


    May 9, 2007
    good call. i just picked one up on ebay.
  15. Jerrold Tiers

    Jerrold Tiers

    Nov 14, 2003
    St Louis
    BTW, the current B-115E cab is rated 8 ohms..... I thought so and the Loud site confirmed it.

    The backplate SHOULD have had a label on it..........

    If the Hartke cab is 8 ohms also,you should have been fine with that........ but then your description of the repair does not scream "blown amp", instead you described it as "they said board needed soldered"......
    That would have nothing much to do with the speakers, which are not related to bad solder joints on a board.

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