I need your advise: Did I misunderstood 4ohm and 2ohm head/cabs?(Aguilar TH 500 related)

Discussion in 'Amps and Cabs [BG]' started by Sanchan, Jul 30, 2017.


  1. Sanchan

    Sanchan

    Jan 4, 2014
    Lake Forest, CA
    Hi Guys

    I just picked up two 4ohm cabs(Carvin BRX 10.2)I found in CL. Both cabs were tested in seller's garage with his Aguilar TH500 and they sound good to me. But I am a bit concerned that he was using both 4 ohm cabs with his amp head at the same time! I thought that this would make it to be 2 ohm which is not recommend by Aguilar!? I mentioned this to him but he told me it has been fine..needless to say I am a bit confused... Is something damaged? Did I misunderstood ohm things? Thank for your help!:help:
     

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    Last edited: Jul 30, 2017
  2. Killed_by_Death

    Killed_by_Death Snaggletooth Inactive

    If he played them at a low volume w/o pumping a lot of bass to them, they'd probably be ok for a bit, but I wouldn't want to play them loud or for an extended period.

    I also think it's more damaging to his amp, but the experts will be along to clarify soon.
     
  3. Sanchan

    Sanchan

    Jan 4, 2014
    Lake Forest, CA
    Thanks! I bought his cabs but not his amp so I am hoping that I can still use cabs..
     
  4. Killed_by_Death

    Killed_by_Death Snaggletooth Inactive

    Your amp can run at 2 Ohms?
    or you're just going to use them one at a time?
    or in series?
     
    Sanchan likes this.
  5. Sanchan

    Sanchan

    Jan 4, 2014
    Lake Forest, CA
    Coincidently, I also have Aguilar Th 500. I did not plan use both cabs at the same time! However, If i am going to use both cabs at the same time, I will use my other head(GK RB 700ii or Kustom KXB 500) as a slave amp to power up the second cab while TH500 paired with the first cab. What do you think? A solid idea?
     
  6. Killed_by_Death

    Killed_by_Death Snaggletooth Inactive

    You could also assemble a series box to connect them in series.

    Note: if you do that, get a non-conductive box, because grounding either wire of the output of a Tone Hammer is a recipe for disaster
    The Class D amp in those sends a signal through both sides of the wire, so neither can be at ground potential

    That SRX would sound pretty sweet through those cabs & a Tone Hammer!
    or is that a L-2000?
     
  7. Sanchan

    Sanchan

    Jan 4, 2014
    Lake Forest, CA
    Forgive my ignorance! I have no idea what "series box" and "non-conductive box" are.. I need to google to find out.. btw that is my L2000 tribute. I like it very much while I usually bring my Stingray4 for a gig!
     
  8. There are boxes that can allow you to put two 4 Ohm cabs in series to make a total of 8 Ohms. Normally two 4 Ohm cabs would be in parallel with one amp and present a 2 Ohm load to the amp. This box allows the use of two 4 Ohm cabs with a head rated for no less than 4 Ohms. If you buy a box you don't want one with a metal cabinet and grounded jacks. So the recommendation is for a non metallic, aka non-conducting cabinet.

    This may all be getting into more than you want to know right now.
    Since you plan to use both cabs with seperate amps, you should be OK without doing anything fancy.

    If you want to explore the whole business of impedance ratings and series/parallel speaker connections at some time, just drop back in any time.

    As far as the speakers go, having both of them hooked to that guys amp at the same time shouldn't be an issue for your speakers. As long as he didn't abuse the speakers while he owned them, what he fid to his amp as a result should be of no concern.
     
  9. Sanchan

    Sanchan

    Jan 4, 2014
    Lake Forest, CA
    Thank you so much for your advise! Do you have a particular brand box you recommend?
     
  10. You got the whole ohms thing right and that guy is lucky he didn't fry his amp. Your speakers should be ok. I think the amp would probably have to fry to do damage to the speakers.
    Personally I wouldn't bother with a series box. By going up to 8 ohms you're going to cut the amp's output in half.
    I would use your 2nd amp or just use 1 cab.
    I sometimes use 2 TH500's with 4 GS112 cabs and it sounds awesome.
     
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  11. Sanchan

    Sanchan

    Jan 4, 2014
    Lake Forest, CA
    Thank you! 4x 112 with 2x TH500 is awesome setup! I need to save $$$ so that I can get a second TH. Two TH500 with Two BRX10.2 would be cool too!
     
    BassmusM6674 likes this.
  12. No I don't use them. I know how to roll my own if I wanted.
    I was just trying to help you understand what was mentioned earlier.

    The reason I would do series with the gear you have is because you might be pushing things with just one cab on your TH 500. You will need to be careful, and listen for any signs of distress.... strange sounds from your speakers that don't sound right.

    With the two cabs in series you will reduce the power output from your amp. (See your manual for the 8 Ohm power rating - maybe around 350 watts?). But having twice the speaker area would more than make up for the loss of power. Then you are distributing the power between 4 speakers at 8 Ohms (2 cabs) rather than two speakers at 4 Ohms (1 cab). Both cabs in series would allow you to crank with less worry about the speakers "farting out." And you may find you won't need to crank as much.

    Series wiring is not standard. There is nothing inherently wrong with it. It just takes a little doing, in one form or another to accomplish it. But in your situation, it might be worth it.
     
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  13. Killed_by_Death

    Killed_by_Death Snaggletooth Inactive

    I'm pretty sure there's a thread on TB where a BM made a series box & took snapshots of the inside before they sealed it up, but I can't seem to find it.
     
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  14. Sanchan

    Sanchan

    Jan 4, 2014
    Lake Forest, CA
    Thank you! I did not know anything about "series" connection. I will look into it and study more!
     
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  15. Al Kraft

    Al Kraft Supporting Member

    May 2, 2016
    Northern Virginia
    I also seem to remember a couple of folks who mentioned having a set of specially built speaker cables that were set up for a series connection of two cabs.
     
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  16. Killed_by_Death

    Killed_by_Death Snaggletooth Inactive

    If you really want to spend money instead of doing it yourself:

    Sherlock Audio :: Products :: Speaker-Mate :: Model TWO


    I've read on TB that the maker of this box could make you one with SpeakON connectors:

    Series Speaker Adapter Box - $30.00 : Bayou Audio Cables, custom handmade cables


    me: I'd buy an ABS (plastic) junction box big enough to mount three Neutrik SpeakON Combo jacks on, get the Neutrik Combo jacks & wire, and then wire it up.
    I'm sure someone here would be willing to make you a quick drawing.

    BTW, the "Combo" SpeakONs will accept 1/4" connectors as well as SpeakON:

    nlj2md-v.jpg
    If you don't already have enough SpeakON speaker cables, buy some Neutrik SpeakON connectors & some wire to make those as well.
     
    Last edited: Jul 30, 2017
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  17. Sanchan

    Sanchan

    Jan 4, 2014
    Lake Forest, CA
    Last edited: Jul 30, 2017
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  18. Al Kraft

    Al Kraft Supporting Member

    May 2, 2016
    Northern Virginia
    There is a thread from around 2010/2011 where Munjibunga provided a nice wiring diagram. It was in the amps and cabs forum and I think the title included "series cable" if memory serves me. I'm pretty sure a search would surface it quickly because I recall reading it not too long along.
     
  19. Ampslut

    Ampslut

    May 15, 2017
    Barrackville WV
    Running a SS amp that is rated 4 ohms minimum at 2 ohms will usually cause it to overheat and shut down. If all he did was to run it at 2 ohms at low volume for a short period of time, this should not hurt the amp and it definitely won't hurt the cabs. You wrote that the guy said that he ran it that way all the time and it had not caused any problems. That tells me that he hasn't pushed it hard enough to cause it to go into thermal shutdown. As to this somehow damaging the speakers? Today's modern SS amps have some pretty sophisticated protection circuits that shut it down before anything like that occurs.
     
    Last edited: Jul 31, 2017
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  20. Sanchan

    Sanchan

    Jan 4, 2014
    Lake Forest, CA
    I am very relieved to hear that! I just spent enough $$$ for those two cabs...can't/don't want to think about spending more $$$$ to replace four possibly damaged speakers...lol:nailbiting:
     
    Last edited: Jul 30, 2017
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    Primary TB Assistant

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