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In Reply to: RE: Musiland Monitor 01 USD - late to the party, but... posted by Thorsten on December 18, 2009 at 05:15:42
I have an HP 150MHz with FFT module. It is not really much good for looking at fast digital waveforms; there are more dots than I want to see! My scope observations do not involve using probes but through a high bandwidth 75R 1.5m cable terminated into 75R at the scope.
I don't believe that one can mod the Musiland to high end audio standards. For a start, the F sythesis does not output a tight sampling rate (100k out). The only way that it starts to approach high end sound is by relocking the output or by playing thru a dac with v low jitter clock cleaning/internal clock. I used a Universal Audio 2192 and a Buffalo dac for listening. An external power supply such as a Jung type regulator is also needed. The usb V bus must be cut as well.
Does the 1.0.5 driver on your system give 100% scaling on the asio or wdm boxes?
Follow Ups:
Hi,
> I have an HP 150MHz with FFT module. It is not really much
> good for looking at fast digital waveforms; there are more
> dots than I want to see!
Maybe, I find it very useful and nowadays very rarely get the Tek analog 'scope out.
> My scope observations do not involve using probes but through a high
> bandwidth 75R 1.5m cable terminated into 75R at the scope.
So you are looking at the end with the 'scope in 1:1 mode, while I am looking at the beginning with a probe that minimises capacitance. So rather different methodes. Also, mine was powered of the USB bus.
> I don't believe that one can mod the Musiland to high end audio
> standards. For a start, the F sythesis does not output a tight
> sampling rate (100k out).
Sorry, I do not follow? How can the sample rate be 100KHz out? I am getting the expected frequencies everywhere. Do you mean 100Hz?
Anyway, I was merely referring to the actual measured behaviour of the SPDIF output, not to the overall performance. What I have found however, is that jitter with the mods I did (01 USD) is low enough that my AP can't show it, which is not very, very low, but lower than many CD-Players/Transports and lower than any PC Audio device I had at hand.
> Does the 1.0.5 driver on your system give 100% scaling on the asio
> or wdm boxes?
Yes.
Ciao T
Sorry, I do not follow? How can the sample rate be 100KHz out? I am getting the expected frequencies everywhere. Do you mean 100Hz?
-------------------------------------------------------------------------
Sorry, 0.1k not 100k. Still locks on my Big Ben and UA2192.
Hi,
> Sorry, 0.1k not 100k. Still locks on my Big Ben and UA2192.
Hmmm, need to test again, but I did notice this in the lab...
Is it 100Hz at 44.1KHz and scaling or 100Hz at any rate?
Ciao T
At all rates.
Your 10:1 probe; you are measuring something like 0.03V over 1.5m with no termination? The HP, from memory, is not that sensitive
Hi,
> Your 10:1 probe; you are measuring something like 0.03V
> over 1.5m with no termination?
Not quite.
> The HP, from memory, is not that sensitive
My one is 1mV/div.
And the second trace was measured the same way, so the 'scope and probe where not the limit.
Ciao T
I have just done a re-comparison of asio v ks, and ks even with 5 only buffers, sounds clearly better; more transparent and clearer with no aggression.
Try it.
By mistake, I plugged in a 317 power supply instead of the alw and this sounded both aggressive and not nice.
Re: 317 vs alw: is that before the local regulators or replacing the local regulators?
nt
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