I have checked 3 units. they all seem to be 1-1/4" height. That leaves 1/16" clearance above the transformers.
I have ordered the adapter parts and will be ordering transformers shortly.
Thanks
Signup and order info for the LL1948 adapter kit is in the marketplace now.
Thanks
Hey! Include me please! I was out all afternoon.
Yeah, I personally wouldnât really even bother much with the other mods if it still has the M6 steel trafos in. They impose a âsamenessâ to the sound, a limiter, relatively. The others are more open sounding across the board.
As for trafos. LL1948 is an amorphous core. I would urge to also consider a less expensive, more available high nickel (âmu metalâ) core as well. Both should offer much reduced low freq distortion vs the M6 core. Between the amorphous and high nickel, it might be hard to choose sonically. But both are superior to the M6 steel.
Keep in mind, back in the day amorphous core tape heads were supposed to be superior. I donât know for sure if that was true or not, but in my experience both high nickel and amorphous sound better than the M6, and very similar sounding as well. T
Using matrix, is it possible to consider a mod that would completely bypass the hdmi cable?
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The LL1948 uses a cobalt core.
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What are you imagining? Putting the Matrix components inside the DS box? Regardless youâre going to need wire to carry the I2S signals so Iâm not sure where youâll find an improvement.
three wires and the shortest possible
Jeff, were you able to add me to the pre-assembled list?
PM sent.
I canât connect this to the Edcor4400-Lundahl differencesâŚcan you describe those, too?
The DS Mk2 is going to be using a ground lift circuit to shut off digital inputs not used?
Would there be benefit if we used only one HDMI input or whatever inputs one might need and disable the other circuits we never used. Say if we wanted to sacrifice input flexibility for pure performance on the MK1.
What method would you recommend to disable the unused ones? Is it simply a ground lift for connectors or some place else one would have to disable on the circuit cards?
Would both HDMI be noisier than one?
Of the other 4 XLR, coax,USB, optical inputs which offer most benefit for noise removal by ranking? How would remove those features in a DS Mk1 would the mod be permanent cut traces on PWB or easily reinstated with a soldering iron?
The hardware in the Mk II can turn the power off on multiple subcircuits including USB, I2S1, I2S2 and the upgrade/debug network connections.
Ground lift is a separate option for each input (and output).
On the Mk I, the TOSLink, AES3 and S/PDIF inputs are basically passive, disconnecting those cables is sufficient to avoid noise.
Disabling the USB or I2S isnât simple on the DS. Their power comes from a separate inner layer on the PCB. Using a connector that pulls the inputs to ground on those ports is probably the best you could do.
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I was hoping pulling a surface mount component or plated through hole might work for the USB XMOS chip or extra HDMI processing component could work
But thanks for the extra knowledge. Seems RF and EMF absorber is all we can do. Not sure how pulling ground on input connector helps if no cable is connected for unused HDMI or USB inputs.
Having the stub connector connect the data input pins to the connectorâs ground keeps the inputs from sending garbage that has to be explicitly ignored. When the two sides of a balanced connection (I2S and USB) are floating the receiver can keep flipping from 0 to 1 and back based on the slightest relative noise changes.
If you want to âpermanentlyâ completely disable USB removing L1 and L2 near the XMOS chip will work.
For I2S simply hooking pins 1 thru 12 together (some are grounds the others are signal inputs) will completely quiet all of the I2S hardware.
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Arenât there USB shortening plugs available on the market, just as for RCA?
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Not that Iâm aware, but they should be trivial to construct.
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Thanks for this advice.
I have one more question for further clarity.
So I2S input 2 with one shortening plug will also kill i2S input 1? Or are they independent circuits?
@Turbotk when will you trial Tedâs info in your DAC lab and tell us if these ar worthy of pursuing?
They are completely independent. Itâs quite safe (and on some systems, noticable) to short the input you are not using. I should have said that âit quiets all of the hardware related to that connector.â
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