Black Lion Mod on 828mk1 (not mk2) Good?

[detroitdiesel]

Not the mk2 but the original. Anyone done this? Happy you did?


I've got an original AND a mk2. thinking of modding both.

Thanks, DD

[bkshepard]

I, too, would love to know about this, although this thread should probably be in the MOTU Hardware forum.

[Schweats]

Modded my mark I and I'm very happy ••¦ I noticed more clarity right away, even on my old tired NS10-ms.

I 'm happy HTH Schweats

[dixiechicken]

Black Lion Audio dont do the clock-mod any more.
They will be coming out with their own masterclock unit.


This is what they told me about their mod - as it pertains to MOTU-828:

As for the analog stages, amplifier bandwidth is increased from roughly 8mhz under the stock design to 250mhz under the modification. While it may sound insane that a circuit capable of 8mhz of frequency response would have a 'rolled off' sound, spectral analysis of the circuit shows about a 1/2dB slope in frequencies above 12k, and that gradually worsens to a 3dB dip in frequencies over 18k. This is corrected under the modification.

THD and noise sit at roughly -85dB in the stock design, and under the modification they are dropped to -110dB. While it would be one thing if the stock design's THD content was low order, it's actually comprised largely of high-order artifacts.

It gets a little more complicated than this when we're dealing with circuit slew rate. When driving an output cable, circuit output current is a more important factor, but on the input side, circuit speed is critical. The adaptations we employ increase circuit speed by nearly 600 times, so the input stages are capable of much greater depth and articulation. While there is an apparent increase in headroom, there is nothing to support this increase from a mathematical perspective. My theory is that the increase in circuit bandwidth and drop in THD+N lends a smooth openness to the signal quality that is reminiscent of increased headroom. We've not taken measurements for IM distortion, so I can't give you any information there, sorry.

Cheers: Dixiechicken

[detroitdiesel]

DC- Thanks for the info. I'm fixin to send it in. Seems like a worthwhile experiment for the short $$.

DD