Raidho C1.2 Issue with D250

[martynbaker1]

Just to give an update for those interested...

Raidho believe the blown tweeter was caused by some high frequency ringing/distortion. A raised impedance of the damaged tweeter is what suggests this.

My Townshend Isolda speaker cables have been serviced and they’re fine (because of the construction, a damaged/shorted cable can cause ringing).

The amp has gone off to Devialet and that came back with no problems reported.

The only other issue could be the source. I use Roon over Ethernet direct to Dev and a macmini connected via optical.

I’ve read reports online of macs causing high pitched ringing, though I don’t believe this could be transferred over optical. I sometimes play compressed video with compressed audio, but surely that cuts off the high frequencies.  

So still stumped at present...

The reason for most blown tweeters is an under powered amp clipping, though I wouldn’t expect a d250 to clip at the volumes I play...


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At this moment, I strongly recommend SAM to be turned OFF (from online configurator, not only set to 0% from the remote). I performed multiple tests during the last period (most of them using tone generator and pure waves containing 1 frequency only), and there are at least 3 reasons for this:
- Current firmware version (Firmware 13.1.3 + DOS 2.2.4) is a total failure on SAM area: turning bass or treble above 0 dB is generating heavy distortions. This is not happening on older firmware versions. Also, it is not happening if SAM is turned OFF.
- Between ~10 Hz and ~30 Hz, SAM ON is performing a very strong bass sound amplification. This is MUTCH more than a simple sound adjustment to match with speakers (or SAM purpose: "SAM lets your system achieve perfect temporal alignment between the recorded signal and the acoustic pressure generated by your loudspeakers"). This is for all firmware versions.
- Inside the range 12 ÷ 20 Hz, things are getting really out of control: Expert PRO is generating clicks and distortions on medium speaker - maybe treble speaker also. The source sound is not containing such frequencies, but Expert PRO is "generating" such sounds, and they are pretty loud. This is for all firmware versions.
SAM is supposed to work on very low frequencies only, but it seems that due some software bugs it may generate artificial sounds inside medium and high frequency ranges (and they are pretty loud).
The third reason (I am referring to "clicks and distortions on medium speaker - maybe treble speaker also") may be relating to your problem...

Thanks for this. I knew phase was effected by SAM across the whole frequency range, but it didn’t even cross my mind that this could happen.

Have you had Devialet confirm the problem? Are other people getting the same issue? Just moments ago they asked me to confirm my setup so their engineers could look further into the problem.

Once my tweeters are back SAM will be turned off.

Thanks again.


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