2. amps-preamps
  3. 1323999458

Have I mismatched my preamp/amp?

Hey all; I recently purchased a Cary SLP-50B which I will be mating to a Rawson clone of the Pass Aleph 2. When I started doing the math, I know I'm slow, I looked up the output impedance of the Cary and its Aleph 2 from the Pass site and it's 2.2 K Ohms I checked the Pass site for the Aleph 2, being I don't have the exact spec on the Rawson, and the input impedance is 10 K Ohms unbalanced and 25 K Ohms balanced differential. The Cary only has unbalanced outputs. So, how mismatched is this? I understand the 20:1 rule and I'm way off. My point was to use the Cary to warm up the sound a bit of the Rawson, its brutally sharp and I thought warming it up was a good idea. Advice/Comments are welcome. Jack
fz1jmp

Showing 6 responses by marakanetz

marakanetz's avatar
marakanetz
5,473 posts
 
I would be surprised that Aleph series would have such low input impedance. If that's the case you'll have dynamic headroom limitations. Since your sound is sound than enjoy the music!
marakanetz's avatar
marakanetz
5,473 posts
 
Unsound,
Just to make you aware that Nelson Pass publishes his obsolete designs so the followers would still build components based on his design. Consumers will purchase the "cloned" products that match their budget. So having respect to Nelson Pass implies respecting his products and clones as well.
marakanetz's avatar
marakanetz
5,473 posts
 
...and for commercial purposes there are permissions exist and need to be acquired.
marakanetz's avatar
marakanetz
5,473 posts
 
Pubul57,

Nelson Pass technically is everywhere. His patents are in vast majority of the solid state commercial and home amplifiers. He's like King David and we're all related to him. Anybody who starts building electronic circuits or studies an amplifier basics goes through the NP patents in the study books.

The idea is that respecting Nelson Pass as an engineer don't have to be associated with criticizing those who purchased clones or built clones.
marakanetz's avatar
marakanetz
5,473 posts
 
Rrog,
I've always been under impression that Cary is good but for each good Cary there's a better Quicksilver as a matter of fact.
marakanetz's avatar
marakanetz
5,473 posts
 
Atmasphere,
Isn't it more important to have minimized feedback on power amp vs. preamp?
As far as I know, the differential preamp stages have 100% feedback... Why do engineers need to avoid it technically?
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