In Reply to: Yes. Really.... posted by AbeCollins on December 24, 2024 at 16:43:14:
The graph shows me that the ARC preamp output impedance is probably high and incapable of driving lower impedance loads w/o severe roll-off.The balanced output Z is 500 ohms. What fool would ever attempt to drive a 600 ohm amp? Contrary to your lack of awareness, matching gear is all about impedance. Hence multiple values tested - 600 and 100k ohms with vastly different results. What amps on the market today use 600 ohms?
ARC looks rolled off in the bass region of your graph
There is no *me* to this. I reference John Atkinson's measurements. Flat to 20 hz is *rolled off* to exactly what? Huh?
First column is 10 hz. Down about a tenth.
Edits: 12/25/24
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Follow Ups
- RE: Yes. Really.... - E-Stat 17:07:06 12/24/24 (9)
- "What amps on the market today use 600 ohms?" - Steve O 19:01:24 12/25/24 (8)
- Great reason to pay attention to impedance matching - E-Stat 19:46:39 12/25/24 (7)
- Now you know: there are indeed amps out there with low impedance inputs - Steve O 05:23:49 12/26/24 (6)
- RE: Now you know: there are indeed amps out there with low impedance inputs - Tre' 07:16:01 12/26/24 (0)
- Yes - E-Stat 06:02:54 12/26/24 (4)
- After all this - Steve O 07:55:44 12/26/24 (0)
- "low to high" solves the problems. - Tre' 07:18:45 12/26/24 (2)
- That's what I learned fifty years ago - E-Stat 12:05:47 12/26/24 (1)
- You learned that 50 years ago . . . But ARC apparently learned something different . . . (nt) - Steve O 16:51:54 12/26/24 (0)