Running Benchmark AHB2 in bridged mode and 4 Ohm Speaker

You would need 2 AHB2 amps, one for each speaker. They can be run in bridged mono to 4 ohm speakers. There is an application note page on Benchmarks site where they did this with PCM IB2S monitors. 

@djones51 thanks but the axes of the plot they have are not readable to me. Does the impedence of the speaker ever dip below 4 ohm. This is not clear to me.

https://benchmarkmedia.com/blogs/reviews/ahb2-driving-pmc-ib2s-studio-monitors

@geek, have you considered emailing Benchmark and asking them? I have done that with other companies. I admit that chart isn't easy to read maybe they can send you a better one. 

My impression is that these amps are run a lot in bridged mono mode, and that indeed Benchmark may recommend this.  I seem to remember a recent review of the DAC3 mentioning this.  They may not react to bridging the way conventional amps do.

@djones51 I am preparing to ask this question. Right now I am trying the speaker manufacturer / dealer to get me answer to the question "what the lowest impedance the speakers can dip to". 

Every speaker manufacturer should publish impedance vs frequency graph or just state the lowest impedance. Only very few do that, I don't get why.

I did get one response from John @ Benchmark regarding what the tested output @ 4 Ohm in bridged mode is. 

@twoleftears I am glad you mentioned this, I did also hear about this but no concrete info anywhere regarding this. I will try to find out. Thanks for point this out.