Running Benchmark AHB2 in bridged mode and 4 Ohm Speaker

I’m kicking back listening to my bridged mono AHB2’s :)

And there it is, protecting ones self interest regardless of the facts for others.
Yes you need bridged ones with your speakers (attached).
But the OP does not, and he’ll get better sound with just 1x stereo one.

ATC SM19 Lab Report
" Average sensitivity (considering measurements in octave steps between 125Hz up to 16kHz) is close to 83dBSPL/2.83V/1m, a performance that undoubtedly classifies the SCM19 as a low-sensitivity loudspeaker,"
"SCM19’s impedance magnitude variation is quite small for frequencies above 100Hz and as an amplifier load is -for all purposes- constant. The minimum value of about 5.6 Ohm appears near 150Hz and allows us to conventionally consider the loudspeaker as an 8-Ohm load, although -typically speaking- a correct designation would be 6 Ohms. Below 100Hz, impedance magnitude significantly increases up to 50 Ohm, a behavior which could affect amplifiers with low damping factors. Also, phase behavior, ranging from +47° to -57° could be quite punishing for small amps."
http://www.avmentor.net/reviews/lab/2016/atc_scm19/display/atc_scm19_impedance.jpg

Cheers George

As usual, some of us try to help the OP and some of us go off on a tangent to defend their own stuff. Then everyone gets mad, I'm not mad though I am surprised at some of the responses. :(

I was surprised to see that the ATC 19 is actually 19 liters which is only 0.67 cu ft. I can't imagine why someone wants to connect this little guy to a 370 watt bridged amplifier. The speaker only goes down to 55 Hz. The resonance can be seen on the impedance graph.

I have no doubt that the Benchmark performs as stated. I am surprised that there is such fuss about whether distortion at the 0.0002 level doubles or not. Or whether the very high damping factor is cut in half. Or whether the imperceptable noise is doubled or not. Most likely your preamp will create more noise than this amplifier.

Its a bit like Woody Allen said...  "Boy, the food at this place is really terrible." The other one says, "Yeah, I know; and such small portions."

@ramtubes lol noted, it did cross my mind to get preamp and DAC from Benchmark but I am constrained by using Wavelet. My core concern was stability at or below 4 Ohm bridged. My questions are answered. I am in the process of getting a second amp. Thanks.

My questions are answered. I am in the process of getting a second amp. Thanks.

Total $6K.
Pity for that you could of got a pair of John Curl designed Halo JC1 monoblocks that would eat these bridged AHB2's for breakfast. 
They "unbridged" output  400W into 8 ohms, 800W into 4 ohms, 135 amps of peak current, and 25W of pure class-A power into 8 ohms. 
                                  JUST SAYING!

Cheers George 

ramtubes said:

I was surprised to see that the ATC 19 is actually 19 liters which is only 0.67 cu ft. I can’t imagine why someone wants to connect this little guy to a 370 watt bridged amplifier. The speaker only goes down to 55 Hz. The resonance can be seen on the impedance graph.

It’s a sealed cabinet design and bass rolls off slowly providing pleasing extension into the mid 40’s in room.
Obviously 380W is not required (or used by me) but 150-200W is useful with the low sensitivity SCM19’s if one wishes to explore the considerable max spl of which they are capable (108dB). ATC recommends 75-300W, though to be fair a single AHB2 drives the SCM19’s very well.
Since my equipment resides in a room corner I also wanted to exploit the placement flexibility of mono blocks which allows positioning behind the speakers and short speaker cables (which should also mitigate loss in damping factor from bridging - not that DF is an issue ;-)
In regard to your other snipe at me, go back and read the first line of my first response in this thread. My subsequent posts were then attempts to correct (apparently deliberate) misinformation. Something you apparently have no problem with.