Are the ins and outs of the pfmod all rca?
yes, all RCA.
And I would go with this recommendation from zeluxao. This is how I run mine using the PFMOD that zeluxao suggests (& have been for many, many years:
Using it in my Tri-Amped application: One NAD 2200 on each main,& one NAD 2200 running 4 ohms stereo on the pair of subs.:
I use these amps Tri-Amped-1 on each main speaker (using the 8 OHM setting, as the speakers are 6 OHM at their lowest point).
& one running stereo 4 OHM for my woofers, which are 4 OHM each.
Per Amirm (on one of my personal NAD 2200's):
Note the differences in the frequency response plot and the SINAD.
They are both better when you run it using the LAB INPUTS (that is true whether you are running bridged mono or not) :
NAD 2200 Vintage Amplifier Review
Wow, we have one kilowatt of power coming out of this amp in short duration!
I was surprised that the frequency response was not flat but was relieved to see later in the thread that this is due to insertion of low and high pass filters. So here is the frequency response with Lab input that doesn't have such a filter:
Response now (in green) as it should be, ruler flat to below 10 Hz, and well extending past the 40 kHz limit of this measurement.
I figured the filters may be adding some noise/distortion so re-ran the dashboard again:
Distortion doesn't change but if you look at the noise floor at 20 Hz, it is down by some 10 dB. That improves SINAD a couple of dBs, making the amplifier stand out even more!
Zoomed:
And signal to noise ratio:
Conclusions
Nice to see innovation like this from equipment that is over 30 years old! Shame on manufacturers that produce amplifiers for much less power, more distortion and higher prices these days. No, you don't get a fancy case here and sheet metal is strictly budget category. But you are not going to sit on the amp. The guts are where it matters and NAD 2200 delivers.
NOTE: the output relay on stock 2200 gets corroded and fails over time. There are videos and DIY threads on how to upgrade the relay there to fix the problem. The unit tested here has that fix. Other than that, there are not reports of many other reliability issues even though NAD products are often said to be less reliable than other brands.
Overall,
I am happy to recommend the NAD 2200. I almost gave it the highest honors but given the upgraded nature of the test unit, and the fact that used amps may have issues, I avoided that. But you could have easily pushed me to give it the golfing panther