Digital Drive

Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it.

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Re: Since you've done so much...

Posted by MikeT on November 4, 2001 at 22:26:31:
Well, I really have not had time to do much serious listening so far. This morning though I played two of my "reference" disks, Kind of Blue and Take Five. I've been listening to these albums in vinyl and CD form for 30 years or so, I have a pretty good baseline. With the modified DI/O I hear the music with no distractions. When I'm done I'm not gritting my teeth. The same is true with a disk I have of Beethoven piano sonatas played by Rubinstein. Some of these pieces used to make my teeth chatter, but now the high end harshness is gone. I don't know if I attribute this to the LT op amps by themselves though. I first want to do more listening and then put the TL074 back in and see what happens.
I bought the DI/O for $122 and I really wanted it to see what could be done with mods. It's a tremendous bargain for the price. It sounds head and shoulders better than the analog out on my DVD player, which uses drivers in the DAC chip - no op amps even! Talk about shrill sounding. I'm really glad to see the DAC board is a sub-board. I've been thinking of re-doing the power supply and analog sections totally, and just re-using the DAC board. The DAC's got differential outputs, so I'm thinking of going that way. I also want to try about twice the power supply capacitance that exists in the unit right now, bypassed. Who knows where it will end!
I also read a post from you where you state that anyone who doesn't worry about impedance matching at 3 mhz has never worked 80. Ain't that the truth. There are times when, based on what I read in the audio world, I wonder if the laws of physics and good circuit design principles apply. I won't get into another "75 ohm" SPDIF discussion again, people get too upset. Impedance matching = low return loss = signal integrity.
I'm also thinking about making a balanced digital connection between my DVD player and the ART. I'm using a Pioneer DV37 and it cost me close to a grand, so I'm not too keen about hacking it up. Don't know what I'm going to do yet. Maybe buy a cheap CDP with a good transport and use that as my vehicle.