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I may not have golden ears (not sure), but, last night, I was playing with passive vs. 0-gain active on my Schiit Kara preamp, and I can easily hear the difference (and greatly prefer the preamp in passive mode).
This becomes interesting when one looks at the specs:
Passive
THD+N unmeasurable with APx555; below analyzer capability
Balanced to Balanced
Gain: 1 (0dB)
Frequency Response: 20Hz-20Khz, -0.1db, 3Hz-500KHz, -3dB
THD: <0.0002%, 20Hz-20KHz, at 4V RMS
IMD: <0.0002%, CCIR
SNR: >129db, A-weighted, referenced to 4V RMS
So, THD & IMD levels well below .0002% are audible?
It seems so. Something is.
(My system is probably pretty transparent, with a NAD M23 and Quad ESLs downstream.)
(Oh, by the way, Schiit's tubed version of this preamp is *Stereophile Class A,* among a sea of $30,000 wonders - and the non-tube version sounds better IMO. For $800.)
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Topic - Just how sensitve is our hearing? - PaulF70 09:31:13 03/07/25 (57)
- RE: Just how sensitve is our hearing? - SoundMann 11:17:23 03/21/25 (0)
- RE: Just how sensitve is our hearing? - tomservo 07:17:06 03/09/25 (3)
- RE: Just how sensitve is our hearing? - PaulF70 17:22:56 03/10/25 (0)
- RE: Just how sensitve is our hearing? - M-dB 22:53:34 03/09/25 (0)
- Great stuff, thanks for that ! (nt - peppy m. 10:26:51 03/09/25 (0)
- RE: Just how well does one hear an illusion of the mind. - beach cruiser 23:42:15 03/07/25 (0)
- In ways that - E-Stat 16:04:41 03/07/25 (24)
- "Conventional tests using uncorrelated sine waves" - 13th Duke of Wymbourne 07:19:51 03/08/25 (3)
- Each other -nt - E-Stat 14:46:26 03/08/25 (2)
- RE: Each other -nt - 13th Duke of Wymbourne 14:28:46 03/09/25 (1)
- That and - E-Stat 14:41:21 03/09/25 (0)
- RE: In ways that - PaulF70 17:53:49 03/07/25 (19)
- And conversely - E-Stat 20:50:29 03/07/25 (18)
- RE: And conversely - PaulF70 17:33:49 03/10/25 (0)
- RE: And conversely - Tre' 06:15:59 03/08/25 (16)
- Impedance marching - E-Stat 07:40:01 03/08/25 (15)
- RE: Impedance marching - Tre' 08:37:22 03/08/25 (14)
- I argued that point with Charles Hanson - E-Stat 08:54:46 03/08/25 (13)
- Right about what? nt - Tre' 09:02:04 03/08/25 (12)
- Passives rob dynamics - E-Stat 09:03:24 03/08/25 (11)
- There is no such thing as a "passive" in an electronic system. - Chip647 13:02:16 03/08/25 (6)
- You have a good point. - Tre' 17:53:26 03/08/25 (0)
- There are no active components - E-Stat 14:34:39 03/08/25 (4)
- Attenuator Box - Inmate51 16:11:55 03/08/25 (3)
- Built one using Radio Shack parts - E-Stat 16:15:18 03/08/25 (2)
- RE: Built one using Radio Shack parts - Inmate51 05:39:09 03/09/25 (1)
- RE: Built one using Radio Shack parts - E-Stat 07:41:06 03/09/25 (0)
- And we have come full circle. - Tre' 09:06:44 03/08/25 (3)
- Absolutely not - E-Stat 09:08:33 03/08/25 (2)
- Do you think it is unknowable? nt - Tre' 09:55:13 03/08/25 (1)
- It is knowable to me - E-Stat 10:19:02 03/08/25 (0)
- Some say it's about as sensitive as we want it to be... - peppy m. 14:35:11 03/07/25 (4)
- Descending control... - slapshot 09:30:24 03/09/25 (0)
- RE: Some say it's about as sensitive as we want it to be... - PaulF70 17:55:53 03/07/25 (2)
- But that's the whole point. - 13th Duke of Wymbourne 07:18:18 03/08/25 (0)
- Not saying I know what you hear... - peppy m. 23:51:41 03/07/25 (0)
- RE: Just how sensitve is our hearing? - Tre' 11:00:32 03/07/25 (8)
- RE: Just how sensitve is our hearing? - PaulF70 12:22:19 03/07/25 (7)
- RE: Just how sensitve is our hearing? - Tre' 14:21:34 03/07/25 (6)
- RE: Just how sensitve is our hearing? - PaulF70 17:56:13 03/07/25 (5)
- RE: Just how sensitve is our hearing? - AbeCollins 23:22:45 03/07/25 (4)
- RE: Just how sensitve is our hearing? - PaulF70 17:24:23 03/10/25 (0)
- RE: Just how sensitve is our hearing? - Tre' 06:12:26 03/08/25 (2)
- RE: Just how sensitve is our hearing? - Cougar 07:23:12 03/08/25 (1)
- RE: Just how sensitve is our hearing? - Tre' 08:45:48 03/08/25 (0)
- Probably not good enough to notice 0.0002% THD and IMD ;-) - AbeCollins 10:07:01 03/07/25 (11)
- RE: Probably not good enough to notice 0.0002% THD and IMD ;-) - Sibelius 11:06:49 03/07/25 (2)
- RE: Probably not good enough to notice 0.0002% THD and IMD ;-) - AbeCollins 23:07:33 03/07/25 (1)
- RE: Probably not good enough to notice 0.0002% THD and IMD ;-) - Sibelius 11:20:48 03/08/25 (0)
- Or 0.02% THD for that matter. Nt - Geoffkait 11:04:36 03/07/25 (0)
- RE: Probably not good enough to notice 0.0002% THD and IMD ;-) - PaulF70 10:13:55 03/07/25 (6)
- RE: Probably not good enough to notice 0.0002% THD and IMD ;-) - AbeCollins 10:32:31 03/07/25 (5)
- RE: Probably not good enough to notice 0.0002% THD and IMD ;-) - PaulF70 12:31:00 03/07/25 (4)
- RE: Probably not good enough to notice 0.0002% THD and IMD ;-) - AbeCollins 23:11:18 03/07/25 (3)
- RE: Probably not good enough to notice 0.0002% THD and IMD ;-) - PaulF70 17:33:05 03/10/25 (2)
- RE: Probably not good enough to notice 0.0002% THD and IMD ;-) - PaulF70 19:35:32 03/12/25 (0)
- RE: Probably not good enough to notice 0.0002% THD and IMD ;-) - Inmate51 06:28:50 03/11/25 (0)
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