In my opinion, this is the Grand idea! Going active on SBLs was my best upgrade ever, only seconded by finding Mana Stands for SBLsā¦ all you need is NAXO, Hi-Cap, and another 250. Then I got special cables from AVOptions to run 250s in parallel, otherwise use a better amp for the tweeters
Once done, I remember bitching about extra noise and distractions at LA Opera, but still had to attend because The Boss insistedā¦ the joys of dressing upā¦
Itās worth going for a SNAXO if at all possible - a SNAXO 242 best of all. The NAXO was progressively improved from each generation. Only problem is that a SNAXO wonāt be āchrome bumperāā¦
Oh, and in addition to the extra NAP250 (youāll need it to be as closely matched to the existing one as possible) and Hicap, youāll need four identical runs of NACA5.
you can reduce a shelf when you upgrade to a Nac 72.
Listening to Bruckner currently on them and i.m.o their biggest quality is that they do bass so right. Not too much, not too less - every tone / frequency seems to be correct.
Back in the day Naim would do active a bit differently than other guys. So in a two way system, (SARAs, Kans, SBL), one amp did bass and treble for each side. Other brands, (yes there were others), would have one power amp for both bass channels and one for the treble. Naim were pretty insistent on both amps being the same. The idea was that as bass requires more power, the stereo amp would benefit by driving one bass driver and one tweeter.
Soldering up alternate leads would allow you to run one amp for treble and a second for bass.
Back then we all were learning, so the idea of say a NAP110 for treble and a NAP250 for bass made sense. I mean, how much power does a tweeter need.
I broached this with JV over a boozy dinner. I had triamps and in this set up, one 250 did treble and the other two 250s did mid and bass for the left and right speakers. Why couldnāt I just run say 2 x 250s and a 110 for treble?
He was quite witty with his takedown of my idea. But also ran the line that three amps the same was best, but if you must compromise, then one 250 for the treble and maybe, (but donāt EVER), go with a couple of 160ās for the bass/mid.
I never did any of this.
But running speaker cable needed some care with both two and three way Naim active.
Funny you should say that about changing to a 72. Iām in the process of upgrading my 32.5 with boards from Ryan Sound Lab. Reviews I read said that the boards upgraded the 32.5 to 82 standard. I personally havenāt heard a 72 or 82 so canāt comment but there has been a significant improvement in the top end, sound stage and a more controlled bottom end since swapping the line out amp boards.
You already have a great system so no need for drama if itās too expensive. You could compromise by getting some 135s. I use a 300 I to SBLs which is a modern equivalent and excellent Imo.
Interesting to read Steveās post about the old Naim philosophy of bass and treble for each amp.
I swapped my 4 x 135ās for a pair of new 300drās about 18 months ago. I found that the bass driving amp was getting a lot hotter than the treble amp and was worried about it shutting down at fairly high listening levels.
I re-connected the xlrās so each amp drives one bass and one treble albeit on different speakers. So amp 1 drives ch1 bass and ch2 treble and amp 2 drives ch2 bass and ch1 treble. Both amps obviously now run around the same temperature and I can relax when the volume gets cranked up.
I realise you need a pair of the same new amps to do this.
My active debut was with a Nap180 on the Woofers and a pair of 135ās on the Tweeters.
Naxo 2-4 was cabled horizontally.
I loved this configuration, a lot of speed and PRAT!