Looking at the photo Ardberg, imho the two small boxes don’t look the same; one has a power button r/h/s, the other it appears not.
Perhaps the OP @gdims can provide a full list of the kit he is enjoying.
Wow, I didn’t expect so much help and I appreciate all this knowledge.
I wish my father was around so I could make fun about how he always wanted great sound but did it so messy 
I’ll give this a good go, clean-up and position everything properly.
@NeilS I don’t think they have been serviced. Not in the last 4-5 years, at least. But they were not being used actively. However, I tried with some Proac speakers and could not hear these distortions. But still, those were smaller speakers that I couldn’t push nearly at the same volumes. So you think it’s worth servicing the power amps?
@sound-hound I already found Richard and he provided me with a copy
I guess they are passive, since there is a single cable with two banana plugs (red, black) at the end.
Well, I remember that the speakers were moved from the first floor to the basement (…) years ago, and I’ve no idea if my father even knew about the transit bolts. I guess they did it carefully though, without bumps or intense movements.
I’ll share a full list of the setup as soon as possible!
DB here is an interesting tale of a fix for Ovator S600s.
I purchased my original pair at the end of the production run, a passive pair ex-dem. Graduating from SBLs active, I was almost fully set up, so MR arranged to do the upgrade in conjunction with my local dealer HFL, who supplied the floating Snaxo and eventually JG did the switch, at that stage using four pack 135s. When the latter required service, they moved on and a pair of 300DRs were added, which as you likely know where used to voice the S600s. All now PL and SL except naca5, all on four stacks of fraim.
Fast forward to last year, after listening to both Kudos 606s and 808s, more out of interest than anything, but with the thought of what happens if…! Totally different and I passed on that idea. As your own dealer commented to me when I was upgrading my AV system which they supplied, the K speakers are not to everyones liking.
By chance a pair of S600s active appeared at the Cambridge Naim dealer. Offer made and accepted and dealer kindly installed, while delivering to another customer nearby.
Well, what a contrast. The dealer believes that they had been unloved, likely largely unused and were much younger than my first pair. We played a few tracks and then repeated after the switch. Required running in, but they are almost factory fresh. Who would have thought so long after production has ended, that a mint pair would emerge!
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If you are in the uk, maybe an indication of area. If nearish to me, you’re welcome to compare notes.
I rather thought they might be passive, although I refrained from confusing the issue, but now the following is something for you to consider. Particularly if you have it in mind to consider servicing the NAPs.
If indeed the speakers are passive, in addition to NeilS’s comment, the speakers will not be any less than ten years old by now, possibly quite a bit older. I have had a pair of S400s crossovers serviced recently Wilmslow Audio, since some of the components were showing their age.
In due course, consider having the cables re-terminated and at the speaker end, with Ovator plugs. One or two dealers have some and they make a worthwhile connection, since they were designed just for Ovators, use the original Naim plugs for the 135 end.
Ah, I’m nowhere near the UK. I’m in Greece, unfortunately.
I’ll collect all these considerations and discuss them with my dealer to see if/how we can get those parts serviced.
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I did wonder if from an earlier comment, you were still living there.
Lovely country!
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I think you have three options:
- See if the problem becomes progressively worse over the coming months.
- Have the amps checked by somebody who knows what they are looking for.
- Have them serviced anyway.
Regards
Neil.
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OK yes I have experienced the same back when I was running CB NAP250 three-pack into Isobariks Active with an old SNAXO - the longer leads have too much capacitance to be driven by the old SNAXO so Naim provided shorter leads (capacitance is proportional to length so shorter is less) . The longer leads actually oscillated when I looks with a scope at what was happening, but the then shorter leads fixed that.
DB.
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Can anyone recommend a good but affordable torque screwdriver? I see there’s a huge range online, but I don’t know if it makes sense to pay more than 100 euros/pounds for one.
Also, are there websites where I’m likely to find a used BMR, or even a speakers? Where do you look for this stuff?
Perhaps your dealer may be able to help. If not see if you can borrow the use of one from an engineer or coy. The issue is that the cheap versions may lack accuracy. German made one here which cost in the order of €200.
Spares - very little around. There is believed to be a coy elsewhere in Europe which might refurbish BMR units - forum rules preclude any references unfortunately, but extended web search is maybe likely to point you in the right direction. Worthwhile exploring all other options before considering replacements.
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I had the same issue with the BMRs they were replaced twice by my hi fi dealer I moved onto 800s and haven’t had any issues with them. Once you notice that rattle distortion it’s hard not to ignore it. 
The Album that always caused issues was Jason Isbel - Southern it was tortuous the listen too.
In fact with my S400 i’ ve never had such issue. Pure coincidence perhaps but 400&800 have a smaller BMR
coy? what’s that?
Martin
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Hi Martin it is an abbreviation for company, probably used more b2b (business to business), with the other abbreviation being co., which it might have been more appropriate to use!
People, I found light mold in the basement and on the speakers and I freaked out. Fortunately, it does not seem like it has spread a lot.
I’m moving the entire system upstairs immediately where there is much less humidity.
Apart from the transit screws, is there any other important consideration for moving them? Should I better place them in their boxes and move them like that? They are heavy and I’m stressing out about it.
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I think I found the safest way. I’ll use the wheels to put them in boxes and carry the boxes. The boxes are old but I’ll tie them carefully with ropes so they’ll hold well.
You’re probably thinking that this system does not deserve this treatment, but oh well, it wasn’t my choice.
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Check any records with paper inners for mould if they’ve been in the damp, your nose will give a clue. I ended up needing a vacuum record cleaning machine to recover some of mine, though mostly just for those that had been on the bottom shelf.
OPs issue seems very specific. I would guess the bmr is borked. Wasn’t there someone else on here with a similar issue recently
Might be, but what gives me hope is that it’s all good on medium volume. For example, I listened to Massive Attack’s Mezzanine yesterday without a single issue. We will see.
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