Although Jammy has bought his I just wanted to add.

I use an NVA AP10H with now HD800, previously HD600. I changed the HD800 cable to a Cardas and have been amazed at how the combination has gone from a thin sounding listen to a most pleasing richness combined with silky mid and treble. The HD800 benefit from the power of the AP10H but the cable change amazed me. Another combination for those looking to consider.

Occasionally my system delivers more to one channel than the other.
Good to have the balance control

I had good results in the past with the Cardas cables when I had the HD650 The sound became 3D and lost the grain that I was hearing before

There have been a couple of issues with cables he has supplied. My L & R channels were wired up inversed, as was another customers.
Another customers cable didn't work, so I could not recommend him 100%. I just want to make you aware of the issues.
He has offered to fix mine, but I just swapped the plugs round in the phones. It seemed easier than sending them back.

The sound difference is not small between the new and original cables.

I would be interested in a 2nd opinion with regards to how the Capella compares to the AP10H. If you have any time and are willing to play about with the Capella versus the AP10H, PM me as once discussed on another forum.

I'll do better than that. You can contact Tony, who has also contributed to this thread. He has both of them and did some extensive testing over a few weeks.

As a manufacturer I get a lot more reviews and comments via email or PM, than I see posts on a forum. Some people re-post the comments made to me on a forum, but that only counts for a small proportion. I have the comparisons from Tony on an email, and I am sure he also posted it on another forum. But it is best that you check with him for a direct link since I don't book mark things like that.
I am not suggesting that he sends you his comments via PM. That's entirely your own conclusion. I am sure Tony has nothing to hide and nothing to fear if he copies and paste his original comments on TAS, instead of us linking to an alternative forum. It is about having members reading stuff hear, instead of having to be diverted to a different place. Life would be boring on TAS if that became the norm.

Of course, if you want to do your own comparison and post them on TAS, let me know. Who knows, you might be pleasantly surprised how much money you could save yourself by plugging your HD800 into a Capella instead of a far more expensive headphone amp. Just think of what you can spend the saved money on afterwards.

Ok Tony, Stans made a wee boo boo thank's, post a comparison if you wish anyway, but I was realy intrested to see how the Capella faired against the AP10h.

OK, I'll bite, no doubt to be ridiculed on the Hi-Fi Subjectivist forum as a result, but........

I recently bought an NVA10P H/P amp and also a Beresford Capella. I took advantage of both companies offering a no quibly money back guarantee which allowed me to make comparison before I chose my preference. Neither companies knew I was operating such a comparison.

Both amps were good with my Sennheiser 650's fitted with upgraded signal cable. Neither amps would disappoint any listener, however, in conclusion I favoured the Capella because it had a smoother and more detailed three dimensional presentation of sound. Both equally accommodated the high and low frequencies and produced a nice mid-range sound but the Capella was both smoother and more revealing. This was assisted by the additional controls the NVA does not have. The NVA was a little grainy in comparison. So on sound alone, the Capella was the winner. I suppose, if I was doing a magazine type assessment, the Capella got five stars and the NVA four on sound.

The NVA has speaker sockets for low wattage probably near field yet useful speaker options and nothing more. The Capella in contrast can be used as a stand alone pre-amp (which it appears, those who have done it marvel at it's capability). The Capella can be adjusted for phones between 12 and 600 Ohms but additionally has adjusters for gain, damping, high frequency (brightness), sound depth and balance.The NVA has none of this flexibility. Whilst the NVA has simple RCA input connections, the Capella offers RCA and additionally a 3.5mm jack input.

Now consider price. The going price for the NVA is £350 although at the time I bought it, Richard Dunn (NVA) had it on special offer at £175 which was a good deal, however the current price is back up to £350. The Capella is £160. To me, considering the better performance and functionality of the Capella, it was a no brainer.

I want to be fair to Richard Dunn. Although I returned the NVA10P to him for a refund whilst he was also managing his business premises move, he was totally honourable to his returns policy and he refunded me promptly. I very much admire and respect him for that.

There you go. Both companies offer very good products, but for me, Beresford was the winner. I suspect Richard Dunn could raise his ability and update his products to match others in the market if he is so inclined. I really hope I've not upset too many members here. This is my honest observation based on the comparison I have detailed.