Can someone figure out the gain of this amp?

Yes, that’s correct.

I see that the BHK Signature preamp has a specified "sensitivity" of 1.3 volts, and a specified "output level" of 4.0 volts. Presumably that means that an input of 1.3 volts would result in an output of 4 volts, if the volume control is set at max. (Preamp gains are usually defined based on the volume control being at max). That corresponds to a gain of about 10 db, which would add to the 34.5 db gain of your Nuforce amp and result in almost exactly the same overall gain as the MA352.

db of gain = 20 x log(Vout/Vin) = 20 x log(4/1.3) = 9.76 db, or about 10 db.

("log" = the base-10 logarithm)

Regards,
-- Al

Check out page 26 of the manual. You’ll see the following stated there:

Voltage Gain:
High Level to Output 1: 44dB
High Level to Output 2: 15dB
Phono to Output 1: 84dB
Phono to Output 2: 55dB

(Output 1 is the speaker output; output 2 is apparently the output of the preamp section of the integrated amp).

The 28 db figure you referred to is a typical number for power amps, but integrated amps tend to have gains in the area of 35 to 40 db or so, since the gain of their preamp section adds to the gain of their power amp section. 44 db in this case is somewhat greater than average for an integrated amp, but is still reasonable.

If those gain numbers weren’t provided in the manual it would be possible to calculate them from the specs you provided, which appear to have come from the less complete set of specs contained in the description at the website. (McIntosh user manuals usually provide more complete specs than the descriptions at their website). Post back if you’d like me to go through those calculations.

Regards,
-- Al