V1 subwoofer help needed

Welcome to the forum!

The V1 does have two analogue outputs, a DIN and an RCA. They are not really intended to be used simultaneously, but it will work, although doing so could degrade sound quality. I guess you could give it a try. 

The answer to avoiding the degradation in sound quality is to use a DSP interface / room correction module connected using short low capacitance RCA cables and then employ this as the line driver.  In my case I use a miniDSP 2x4, but an Antimode Stereo is also suitable.  You then use a longer cable to go from the DSP to the sub.

Thank you "Huge .. Member", this is really helpful and I think I can even follow the instructions.. does this interface modify the sound signal at all ? Do you hear a difference with your set up ?

Whilst I acknowledge that it's probably meant as a joke, but the "Huge .. Member" comment is notably inappropriate in my case!

The interface can be made to modify the sound signal going to the sub, but the point is that doing it this way only modifies the signal going to the sub, it leaves the signal going to the main speakers pure and blissfully unmolested!

It has the added advantages that you can incorporate digital room correction filters for the sub only, without affecting the clarity of the main speakers (an aspect which many digital room correction systems notably fail to achieve) and it can also more precisely control the crossover form the main speakers to the sub.  If you are going to set up a sub, I would very strongly recommend getting yourself an instrument microphone (such as a miniDSP UMIK-1) and a copy of REW to optimise the integration of the sub into the room and the main speakers.

Apologies for my inappropriate humor. Thanks for the help on this. Very helpful. I need to now go and do some more work on it all...

When you've had a look and understand a bit more (particularly if you've measured the room with REW), then come back here and if you need it I will help with the interpretation of the graphs.  In my opinion it really is worth doing and getting to right; subs get a bad reputation because so many people don't learn how to set them up for music (rather than just setting them up for cinematic effects, which is somewhat less critical - for instance, to optimise for music replay you should never put the sub in the corner of the room).

I realised it was humour, and thanks for the apology; so I'm not going to get annoyed by it - no problem.  

Huge posted:

The answer to avoiding the degradation in sound quality is to use a DSP interface / room correction module connected using short low capacitance RCA cables and then employ this as the line driver.  In my case I use a miniDSP 2x4, but an Antimode Stereo is also suitable.  You then use a longer cable to go from the DSP to the sub.

Naim say that it’s the performance of the V1 that will suffer if you use the two outputs simultaneously, their intention being to give you the choice of DIN or RCA rather than a second pre out. So I think the room correction you are referring to is the solution to a different problem. 

The reason for most of the degradation of sound quality is due to the extra capacitative load on the output transistors.  The use of a DSP placed close to the DAC connected using short low capacitance leads is to reduce that extra capacitance, and thus minimise the loss of quality in the DAC.