[tbrooke]

I am using a Behringer Ah500 fed from the DCX-2496 to drive the bass section on my RM-30 - One channel died on the Behringer so I got a new one and then I had a channel die on the new one- I know this might just be because they are cheap amps but I am also thinking that if the two drivers in the bass section are running in parallel then the impedence might too low for the Behringer 

Does this make sense?

I am using 1 channel each from two separate Behringers and it is working great (actually I think it sounds better than it ever has ) and I am actually thinking of not sending back the new Behringer but I still think there might be more going on than just faulty amps

Any thoughts?

[Darac]

RM30 has declared impedance of 4 ohms. This value should perhaps be fixed, but experience has taught me that a floating impedance value. Your amp does not know and can not make specific advice, but I know that you need an amplifier that is stable at low impedances. I think you will Brian give more concrete answer, but also John.

[John Casler]

Hi Tom,

I can't effectively answer your "impedance" question as well as Brian can, but we often use the Behringer Amp for the least expensive PBS (Powered Bass System) so I presume B, thinks it a good choice in that price range.

What we DO NOT suggest, is "bridging" the channels and running the woofers as that makes the amp too unstable.

[James Romeyn]

Do you have the side firing 10"?

You say you had two amp failures?  In both cases was the failure on the channel powering the same RM30?  Compare the input resistance of the bass sections alone, one RM30 vs. the other RM30.  If one measures lower, on that speaker, remove the woofers and make sure the terminals do not short.  It was many years ago, but they employed thick wire soldered to thin driver terminals, which combined with the thick baffle, bent and shorted the large wire/solder lumps of one woofer together when they installed the woofer.

Hope this helps. 

The minimum impedance may drop below 3 Ohms.  What is your amp's minimum impedance rating?  I'm suspicious your amp is not rated for low impedance loads.