What do you mean by "sub output" exactly?
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You basically need a preamp output for the subwoofer.
If your subwoofer can also be run off the speaker terminals (such as all REL models); you can use any integrated amplifier. I actually prefer the speaker terminal method for 2 channel music listening, assuming the sub can connect that way.
There are quite a few good integrated amps with pre-outs..
Disclaimer...I am a dealer....The Blue Circle CS Integrated can be custom ordered with pre-outs.
Quite of few nice Creek models have pre-outs. I am sure we can come up with a big list here.
The term "sub out" to me implies a low pass filter, which most integrated amps do not provide.
As others have stated, assuming line-level connections, a preamp output is necessary to connect a subwoofer. However, I personally that is only *half* of what is necessary. So that you can insert a crossover (that has a high-pass filter and low-pass filter), you also need main amp in jacks.
All NAD, Bryston, some Creek, some Rega, some Arcam integrateds have both.