Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it.
|For Sale Ads|
Use this form to submit comments directly to the Asylum moderators for this forum. We're particularly interested in truly outstanding posts that might be added to our FAQs.
You may also use this form to provide feedback or to call attention to messages that may be in violation of our content rules.
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.