RE: re Bottlehead

Posted by Bill Way (A) on January 28, 2015 at 14:03:15

In Reply to: RE: re Bottlehead posted by Paul Joppa on January 27, 2015 at 17:46:40:

Yes, an attenuator will reduce upstream noise by the same amount that it reduces the (upstream) program level. So, if you hear preamp noise when listening at about an 82dB SPL, attenuating the signal after the preamp will reduce both noise and program. It might be the case that, by the time you're at 72dB, the noise is no longer intrusive, and the lower SPL should reduce the distortion caused by microphonic tubes, if that was part of the problem. I don't see how an attenuator between the preamp and power amp can reduce the level of upstream-induced noise relative to program level without paying the price of listening at a significantly lower level. Am I missing something here?

Paul, I read you paper, and have a couple questions:

1) What is it you accomplish with that process? Is it to have the preamp operating at a level where it has the greatest non-distorting S/N ratio, or is it something else?

2) You write, "Sources should adhere to the -10dB(v) nominal standard, which can be accomplished in the source device, or at the input of the target device (preamp, usually). This is relatively easy. Amplifier/speaker combinations should produce 82dB sound level at the listener’s ear when the input level is -10dB(v). Unfortunately, it is extremely common to find there is too much gain in this part of the chain." Why is it important to hit 82dB at -10dB(v)?

Thanks,

WW

"Put on your high heeled sneakers. Baby, we''re goin'' out tonight.

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Follow Ups Full Thread

Topic - Audio Note vs. Bottlehead vs. what? - PranaBindu 14:53:51 01/26/15 (20)

RE: Audio Note vs. Bottlehead vs. what? - hifipaul 13:33:51 01/27/15 (0)

re Bottlehead - Bill Way 12:31:21 01/27/15 (4)

RE: re Bottlehead - Paul Joppa 17:46:40 01/27/15 (1)

RE: re Bottlehead - Bill Way 01/28/1514:03:15 01/28/15 (0)

RE: re Bottlehead - PranaBindu 13:10:19 01/27/15 (1)

RE: re Bottlehead - SteveBrown 15:13:47 01/28/15 (0)

here's one.... - Cougar 20:39:42 01/26/15 (1)

RE: here's one.... - PranaBindu 22:26:09 01/26/15 (0)

RE: Audio Note vs. Bottlehead vs. what? - Caucasian Blackplate 18:38:32 01/26/15 (1)

RE: Audio Note vs. Bottlehead vs. what? - PranaBindu 22:20:25 01/26/15 (0)

RE: Audio Note vs. Bottlehead vs. what? - SteveBrown 16:06:57 01/26/15 (9)

RE: Audio Note vs. Bottlehead vs. what? - PranaBindu 22:35:42 01/26/15 (0)

Do you really want a preamp? - andy evans 16:15:45 01/26/15 (7)

RE: Do you really want a preamp? - PranaBindu 22:43:15 01/26/15 (0)

Yes, most don't need a preamp - Chip647 17:01:06 01/26/15 (5)

RE: Yes, most don't need a preamp - SteveBrown 18:59:02 01/26/15 (4)

RE: Yes, most don't need a preamp - Chip647 19:22:14 01/26/15 (3)

RE: Yes, most don't need a preamp - Caucasian Blackplate 19:30:11 01/26/15 (2)

RE: Yes, most don't need a preamp - Eli Duttman 21:29:30 01/26/15 (1)

RE: Yes, most don't need a preamp - Chip647 10:01:04 01/27/15 (0)

Follow Ups

RE: re Bottlehead - Bill Way 01/28/1514:03:15 01/28/15 (0)

RE: re Bottlehead

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