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

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.

 

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

 

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?

 

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.

 

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.

 

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.

 

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.

 

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.

 

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:


If you don't already have enough SpeakON speaker cables, buy some Neutrik SpeakON connectors & some wire to make those as well.

 

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.

 

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.